KR20230071845A - Method of repairing and reinforcing damaged part of concrete structure using assemblable anchor and panel - Google Patents

Abstract

The present invention relates to a method for repairing and reinforcing a damaged part of a concrete structure using a prefabricated anchor body and a panel, and more specifically, in the case of repairing a damaged part of a concrete structure in water or on land, the depth of the section to be restored. And it provides a method for stably repairing and reinforcing in a simple way using prefabricated anchor bodies and panels that can be immediately fitted and installed in the field according to size.
According to the present invention, in repairing and reinforcing the damaged part of a concrete structure (for example, an underwater structure and a land structure), an anchor to match the depth or width of the damaged part to be restored immediately before a worker such as a plasterer or a diver performs cross-section restoration work By installing a prefabricated anchor body by inserting a bar (or anchor rod), inconvenience can be minimized during section restoration work, and by installing a panel to ensure internal restraint of the filler material injected during repair and reinforcement work, the structure after repair work It is possible to complete the repair and reinforcement work without expanding the outer diameter of the damaged part, and the filling material injected into the damaged part constitutes a composition using a binder containing blast furnace slag fine powder, an industrial by-product, in addition to cement, and damages the concrete structure using this. By performing minor repair and reinforcement construction, it is possible to maintain the effect of repair and reinforcement for a long time by seeing effects such as improved crack resistance, improved acid resistance, improved tensile strength and durability, improved salt damage resistance and freeze-thaw resistance, and by-products generated in industrial sites By recycling, there is an effect that can improve eco-friendliness and economic feasibility.

Description

Method of repairing and reinforcing damaged part of concrete structure using assemblable anchor and panel}

The present invention relates to a method for repairing and reinforcing a damaged part of a concrete structure using a prefabricated anchor body and a panel, and more specifically, in the case of repairing a damaged part of a concrete structure in water or on land, the depth of the section to be restored. And it relates to a technology capable of stably repairing and reinforcing in a simple way using a prefabricated anchor body and panel that can be immediately fitted and installed in the field according to the size.

After construction, concrete structures are subject to various natural or artificial actions, and their physical performance deteriorates due to physical and chemical transformation according to the number of years of use. In particular, in recent years, efforts to restore safety and functionality by performing repairs in terms of securing safety and performance of construction structures are increasing. When the deterioration of such a construction structure is accelerated, the expansion pressure caused by corrosion of steel bars, freeze-thaw, carbonation, etc. causes cross-sectional defects in the structure, that is, concrete, which poses safety risks in terms of aesthetics, structural strength, and functionality. It contains problems that can cause it.

Therefore, in order to secure the stability and performance of reinforced concrete structures, it is necessary to suppress further deterioration and improve durability by performing repair and reinforcement in the early stages of deterioration.

Repair and reinforcement of concrete structures is to restore the cross section to its original performance and shape after removing the concrete part including deterioration factors such as delamination or delamination of the cross section of the structure due to deterioration of concrete, corrosion of steel, and other causes. It is common to perform repairs by filling or spraying with material.

On the other hand, foundations of underwater concrete structures, such as piers and abutments of various bridges installed in rivers, rivers, or sea, are damaged by damage to the side walls of the structure 10 due to floating objects caused by currents, water flows, floods caused by torrential rain, etc. (20) occurs and poses a risk to the stability of the structure. (See Figure 1)

Therefore, when such a structure damage occurs, it is necessary to repair and reinforce the underwater concrete structure (usually a concrete foundation structure).

Conventionally, as a method of repairing a damaged part of an underwater concrete structure, a method of chipping the damaged part, fixing an anchor bolt, and then pouring a repair mortar (for example, underwater mortar) to finish it has been used.

Anchor bolts used in existing repair work are manufactured by attaching the anchor bar integrally to the anchor body by mechanical welding, so the anchor bar often comes off during work at the welded part. There were often cases where the anchor bar was missing because it caught on the knife and caused inconvenience in the plastering work. In this way, if the anchor bar is missing, it is difficult to strengthen the actual bearing capacity and secure the attachment strength, making it difficult to maintain the repair effect for a long time, and the possibility of secondary damage from a part far from the anchor increases.

Related prior art includes Korean Patent Publication No. 10-2009-0095204, Korean Patent Registration No. 10-0300230, Korean Patent Registration No. 10-0999354, and Korean Patent Registration No. 10-1528120.

Korean Patent Publication No. 10-2009-0095204 relates to scour repair of underwater concrete structures. Rail guides are installed at regular intervals on the outer circumferential surface of the foundation structure in consideration of the degree of scour or deterioration of the foundation structure, and scour The outer circumferential surface of the foundation concrete is expanded and reinforced through the method of closely installing the attachment plate on the damaged area or the foundation structure itself, installing it at regular intervals, installing it in the formwork-use type, and injecting grouting material only in the scour area to repair it. As a method, a technique to increase the durability, load capacity and bearing capacity of the overhead structure was proposed. However, since this technology is cumbersome because anchors must be installed inside the attachment plate before injecting the grouting material and reinforcing bars must be placed there, the degree of improvement is not great.

In addition, Korean Patent Registration No. 10-0300230 describes a method of repairing a scour portion of an underwater structure by injecting mortar in a fluid state into a fiber belt made of a geotextile formwork. In this technology, fiber bands for scour repair are laid in the surrounding scour areas of underwater foundation structures such as piers and abutments, and injection materials such as mortar are injected into the scour repair fiber bands through an injection hole, and concrete or mortar is placed on the scour repair fiber bands. We propose a technique for repairing scour and preventing additional scour by injecting and passing through a bag of hardened fiber bands. However, in the case of the geotextile formwork used in this technology, it is difficult to maintain a constant shape due to underwater work, so it is difficult to achieve perfect injection when injection materials such as mortar are injected from the outside.

In addition, in Korean Patent Registration No. 10-0999354, artificial marble waste powder, cement sludge, phosphoric acid dihydrate gypsum or flue gas desulfurization dihydrate gypsum are used to reduce the shrinkage expansion rate and reduce the shrinkage expansion rate by using alpha-type hemihydrate gypsum. A mortar for repair and reinforcement of concrete structures that can secure quick hardening, speed of operation and economic feasibility by inducing rapid hardening was proposed.

In addition, in Korean Patent Registration No. 10-1528120, while maintaining high physical properties such as bending strength, tensile strength and compressive strength in repairing and reinforcing damaged concrete structures, it has excellent adhesion to concrete structures, chemical resistance and At the same time, waterproofness is excellent, resistance to salt damage and radiation shielding performance are excellent, and storage stability is excellent because it does not harden even during long-term storage, and since each component is separated and mixed immediately before use, the use period is limited. A concrete structure repair and reinforcing agent with properties that are convenient to use in the field and prevent material loss and environmental pollution and a repair and reinforcement method for concrete structures using the same are proposed.

However, the techniques disclosed in the previously proposed patents may have an effect of achieving a predetermined purpose by changing the material composition in repairing and reinforcing the damaged part of a concrete structure, but are not related to the physical attachment strength improvement method. In particular, there has been no suggestion of a technology for improving the attachment strength and bearing capacity by actively responding to the damaged depth and relieving inconvenience during reinforcing steel bar rust prevention and cross-section restoration work.

<Other related prior art documents>

1. Republic of Korea Patent No. 10-0952458

2. Republic of Korea Patent No. 10-1126483

3. Republic of Korea Patent No. 10-1136523

4. Republic of Korea Patent No. 10-1038723

5. Republic of Korea Patent No. 10-0375495

The present invention was developed to solve the limitations of the conventionally proposed technology as described above, and in repairing and reinforcing the damaged portion of a concrete structure (eg, an underwater structure and a land structure), workers such as plasterers or divers perform cross-section restoration work. By installing the prefabricated anchor body by inserting an anchor bar (or anchor rod) to fit the depth or width of the damaged part to be restored immediately before carrying out, inconvenience during section restoration work can be minimized, and filling material injected during repair and reinforcement work By installing a panel to ensure the internal restraint of the repair work, it is possible to complete the repair and reinforcement work without expanding the outer diameter of the structure after the repair work, and the filling material injected into the damaged part is a binder containing fine powder of blast furnace slag, an industrial by-product, in addition to cement By constructing a composition using the composition and using it to perform repair and reinforcement construction of the damaged part of the concrete structure, repair and reinforcement are achieved by improving crack resistance, acid resistance, tensile strength and durability, salt damage resistance and freeze-thaw resistance improvement. It is intended to provide a repair and reinforcement method for damaged parts of concrete structures that can be maintained for a long time and can improve eco-friendliness and economic feasibility by recycling by-products generated at industrial sites.

In order to achieve the above object, the present invention

(a) chipping the damaged part of the concrete structure, arranging the cross section, and measuring the depth and size of the damaged part;

(b) assembling panel guides on both sides of the damaged part of the concrete structure;

(c) An anchor body formed of an L shape in the arranged cross section and having a plurality of anchor bar insertion holes and an anchor body composed of an anchor base to bind the anchor body to the cross section is installed, and Inserting and fixing the number of anchor bars corresponding to the depth and size into the anchor bar insertion hole;

(d) inserting a panel manufactured to fit the width of the assembled panel guide into the panel guide and binding upper and lower ends of the panel to the concrete structure;

(e) injecting a filling material from the outside through an injection hole formed in the panel; and

(f) curing the filling material;

It is characterized by comprising a,

The filler includes cement: blast furnace slag fine powder: durability enhancing component in a weight ratio of 40 to 60: 5 to 30: 5 to 30, respectively, as a binder, and a concrete structure characterized in that using a composition composed of mixing aggregate and water Provides a method for repairing and reinforcing the damaged part.

In one embodiment of the present invention, in assembling the panel guide to the damaged part of the concrete structure in step (b), a partition wall is placed in the middle of the broken part and a two-way panel guide is installed at the outer end of the partition wall. However, the two-way panel guide is characterized in that the bulkhead is supported by binding and fixing to the upper structure of the damaged part, and the panel is inserted between the two-way panel guide and the left and right panel guides.

In addition, in one embodiment of the present invention, in step (c), the anchor body constituting the L shape can be twisted so that when a plurality of anchor bars are inserted into the anchor bar insertion hole, radially insert and install them. It is characterized by enabling it to be.

In addition, in one embodiment of the present invention, when the concrete structure is an underwater structure, the filling material of (e) additionally uses an underwater mortar, an underwater ready-mixed concrete, or a mixture of fine aggregate and underwater mortar. do.

At this time, the underwater-only mortar is 20 to 50 parts by weight of fast-setting cement comprising 100 parts by weight of artificial marble waste powder, 20 to 50 parts by weight of a slag-containing mixture, and 20 to 40 parts by weight of phosphoric acid dihydrate gypsum or flue gas desulfurization dihydrate gypsum. weight%; 30 to 60% by weight of Portland cement; 5 to 20% by weight of cellulose fibers; and 20 to 50 wt% of a binder composed of 5 to 10 wt% of EVA resin, 10 to 30 wt% of a filler, 30 to 69 wt% of an aggregate, and 0.1 to 3 wt% of a water-insoluble separator. there is.

In addition, in one embodiment of the present invention, the durability enhancing component

0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of anhydrous sodium sulfate, 0.1 to 2.0 parts by weight of nano metal oxide powder, 0.1 to 5 parts by weight of vinyl acetate-based polymer, 0.1 to 5 parts by weight of expanding material, 0.1 to 5 parts by weight of polycarboxylic acid-based high fluidizing agent 5 parts by weight, including 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of water-soluble modified latex, 0.1 to 2 parts by weight of alkoxy silane hydrolyzate, and 0.1 to 3 parts by weight of a siliconate-based liquid component,

0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of petrocoke desulfurized gypsum, 0.5 to 10 parts by weight of plaster, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 10 parts by weight of slag 5 parts by weight and a powder component containing 0.1 to 2.0 parts by weight of barium oxide,

It is characterized in that it comprises 0.1 to 2 parts by weight of the active accelerator and 0.01 to 1 part by weight of the lithium-based reaction accelerator.

In addition, in one embodiment of the present invention, the blast furnace slag fine powder includes blast furnace quench slag and blast furnace slag in a weight ratio of 5 to 30: 5 to 30, respectively, and has a density of 2.85 to 2.95 g/m ³ It is characterized by the use of

In addition, in one embodiment of the present invention, the water-soluble modified latex is 10 to 20 parts by weight of acrylic resin, 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber) rubber, 0.1 to 5 parts by weight of hydroxyl acrylate monomer, unsaturated poly 15 to 30 weight ratio of ester resin, 0.1 to 5 parts by weight of gallic acid, 1 to 10 weight ratio of metal cation, 0.1 to 2.0 weight ratio of graphite solvent dispersion, 0.5 to 5 weight ratio of dispersant, and 40 to 70 weight ratio of water. do.

In addition, in one embodiment of the present invention, the nano-metal oxide powder is palladium oxide, iridium oxide, ruthenium oxide, osmium oxide, rhodium oxide, platinum oxide, iron oxide, nickel oxide, cobalt oxide, indium oxide, aluminum oxide, oxide It is characterized in that it is one or a mixture of two or more selected from the group consisting of titanium, tungsten oxide and magnesium oxide.

In addition, in one embodiment of the present invention, the petro-coke desulfurization gypsum is characterized by having a density of 2.65 to 2.75 g/m ³ .

The characteristics and advantages of the repair and reinforcement method for damaged parts of concrete structures using prefabricated anchor bodies and panels according to the present invention are as follows.

1. First of all, in repairing and reinforcing damaged parts in underwater or land-based concrete structures, in the past, anchor bars were attached to the anchor body by welding and used. occurred, and since the anchor bar causes inconvenience during work by plasterers or divers, in practice, reinforcement work is often performed using only the anchor body without the anchor bar. In this case, even if the mortar filling material is injected, it is difficult to secure the adhesive strength, so there is a chronic problem that damage occurs again in the repair part. In the present invention, in order to minimize the inconvenience of these workers, plastering is eliminated from the sidewall of the site, and in the case of an underwater structure, a diver fixes only the anchor base to the damaged section in a simple way when fixing the anchor body, and then By simply inserting an anchor bar (anchor rod), the work can be completed, maximizing the convenience of the work.

2. In addition, it is possible to increase the efficiency of the work by allowing the repair and reinforcement work to be completed by injecting and curing the mortar filling material from the outside without requiring a separate plastering work, and the internal restraint of the filling material using the panel It is possible to make sure that the outer diameter of the structure is not enlarged after repair work.

3. In addition, in repairing and reinforcing damaged parts of structures, as a mortar filling material, it is possible to densely fill the gaps between cements, so that harmful chemicals or chlorides can be prevented from permeating through the gaps. Together, by adding eco-friendly fibers and nano-metal oxide powder, it is possible to improve eco-friendliness, crack resistance, acid resistance, tensile strength and durability, and freeze-thaw resistance. By using a filler material, it has excellent applicability in structure repair and reinforcement methods, excellent corrosion resistance to acidic environments, and in particular, microbial growth is inhibited, so the problem of strength degradation due to microorganisms can be prevented, and the effect of improving weather resistance and surface strength can be achieved. It has the effect of improving durability.

4. In addition, by recycling blast furnace slag fine powder and fly ash, which are by-products generated in large quantities at industrial sites, resource recyclability can be increased and the amount of discarded by-products can be reduced, so environmental pollution is prevented and eco-friendly. There are also effects that can improve.

Figure 1 shows that the damage occurs on the side wall of the concrete structure.
Figures 2a and 2b is a view showing the overall repair and reinforcement of the damaged portion of the concrete structure using a dedicated prefabricated anchor body and a panel according to an embodiment of the present invention.
3A to 3E are cross-sectional plan views sequentially illustrating a process of repairing and reinforcing a damaged portion of a concrete structure using a dedicated prefabricated anchor body and a panel according to an embodiment of the present invention.
Figure 4 shows an example of the assembly type anchor body used in the present invention, Figure 5 shows another example of the assembly type anchor body used in the present invention.
6A is a view showing an example of an assembly type anchor body to which a twist type anchor body used in the present invention is applied.
Figure 6b is a view showing that the anchor bar is inserted into the assembled anchor body to which the twisted anchor body used in the present invention is applied.
7 is a front view showing cross-section repair and reinforcement using an assembly type anchor body in which an anchor bar is inserted into the twist type anchor body used in the present invention.
8 is a view showing an example of performing a repair and reinforcement method according to the present invention for a damaged part of a land concrete structure.
9 is a view showing an example of performing a repair and reinforcement method according to the present invention for a damaged part of an underwater concrete structure.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Figures 2a and 2b are views showing the overall repair and reinforcement of the damaged portion of the concrete structure using a dedicated prefabricated anchor body and a panel according to an embodiment of the present invention, Figures 3a to 3e are one embodiment of the present invention According to the example, it is a plan view showing a process of repairing and reinforcing a damaged part of a concrete structure using a dedicated prefabricated anchor body and a panel in order.

Referring to Figures 2a and 2b, and Figures 3a to 3e, the repair and reinforcement method for the damaged part of the concrete structure according to the present invention

(a) chipping the damaged part 20 of the concrete structure 10, arranging the cross section, and actually measuring the depth and size of the damaged part (FIG. 3a);

(b) assembling panel guides 30 on both sides of the damaged part of the concrete structure 10 (FIG. 3B);

(c) An anchor body 100 formed of an L shape in the arranged cross section and having a plurality of anchor bar insertion holes and an anchor base to bind the anchor body to the cross section is installed, and the anchor body 100 is installed. Inserting and fixing the number of anchor bars 101 corresponding to the depth and size of the damaged portion into the anchor bar insertion hole 103 (FIG. 3c);

(d) inserting a panel 40 manufactured to fit the width of the assembled panel guide 30 into the panel guide 30 and binding the upper and lower ends of the panel 40 to the concrete structure 10 ( Fig. 3d);

(e) injecting a filling material from the outside through the injection hole 42 formed in the panel 40 (FIG. 3e); and

(f) curing the filling material;

It is composed of.

First, in step (a), the damage occurrence part (damaged part 20) of the concrete structure 10 is chipped, the cross section is arranged, and the depth and size of the damaged part are actually measured. Specifically, by chipping the construction target surface of the damaged concrete structure, the surface and cross section are trimmed until an undamaged part emerges. That is, it is a step of removing and trimming the deteriorated part by performing a chipping operation on the cross section of the damaged concrete or by spraying high-pressure washing water.

In addition, the size of the damaged portion of the concrete structure 10, that is, the horizontal and vertical width and depth are actually measured. Determine the range to be repaired and reinforced according to the actual measurement results.

Subsequently, in step (b), panel guides 30 are assembled on both sides of the damaged part of the concrete structure. The panel guide 30 uses a panel guide 30 equipped with a groove portion 30-1 in the shape of a digger with an insertion groove in the center direction, and the panel guide is concreted using anchor bolts 31, etc. It is bound and fixed to the structure 10.

Although not shown in the drawings, in assembling the panel guide to the damaged part of the concrete structure in step (b), when the horizontal or vertical width of the damaged part is wide, a partition wall is placed in the middle of the damaged part and the outside of the partition wall A two-way panel guide is installed at the end, and the two-way panel guide is bound to and fixed to the upper structure of the damaged part to support the bulkhead, and a panel can be inserted between the two-way panel guide and the left and right panel guides. there is.

Subsequently, in the step (c), the assembled anchor body is bound to the cleaned damaged part. In the prefabricated anchor body 100, an L-shaped anchor body having a plurality of insertion holes for inserting anchor bars (or anchor rods) and the anchor body are coupled to form the anchor body into a concrete structure. It consists of an anchor base for binding to the end surface of the damaged part by bolting or anchoring and an anchor bar (or anchor rod) inserted into the insertion hole singly or in plural numbers.

More specifically, the anchor base may use various anchors such as a set anchor, a wedge anchor, and a drop-in anchor, which serve to fix an L-shaped anchor body. A plurality of anchor bar insertion holes are drilled in the anchor body, and the anchor bar may be inserted and installed in an interference fit method. This makes it possible to increase the physical adhesion of the anchor bar to the cross-section restoration mortar. Reinforcing bars, steel rods, fiber anchor rods, etc. may be used as the anchor bar.

Various forms of the prefabricated anchor body 100 used in the present invention will be described later.

Subsequently, in step (d), a panel 40 prefabricated to fit the width of the assembled panel guide is inserted into the panel guide 30, and the upper and lower ends of the panel are fixed using anchor bolts 41 or the like. It is bound and fixed to the concrete structure (10). It is preferable that the panel 40 has an injection hole 42 to inject a filling material into the panel.

Subsequently, in the step (e), the filling material 50 is injected from the outside (eg, on land) through the injection hole 42 formed in the panel 40 using a high-pressure pump or the like. As the filling material is injected, since the front surface of the concrete structure is blocked with the panel 40, the inside filling material is filled while maintaining the shape, and complete filling occurs between the concrete structure and the panel.

Subsequently, when the filling material 50 is cured in step (f), the repair and reinforcement work of the damaged part is completed.

Hereinafter, the filling material 50 used in the present invention will be described in detail.

The filler composition according to the present invention is characterized in that it includes a blast furnace slag fine powder and a durability enhancing component in addition to cement.

Specifically, it is characterized by including cement: blast furnace slag fine powder: durability enhancing component in a weight ratio of 40 to 60: 5 to 30: 5 to 30, respectively.

In addition, additives are added to prevent salt damage and carbonation of the composition itself and the coating layer, to block penetration of harmful substances, to increase the strength of the composition itself, to form a dense shielding film on the surface, and to slow concrete cracks due to heat dissipation through thermal conductivity improvement. 2 to 3 parts by weight based on 100 parts by weight of the total mixture of the furnace cement, the blast furnace slag powder, and the durability enhancing component may be mixed.

More specifically, the durability enhancing component includes 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of anhydrous sodium sulfate, 0.1 to 2.0 parts by weight of nano metal oxide powder, 0.1 to 5 parts by weight of a vinyl acetate polymer, and 0.1 to 5 parts by weight of an expanding material. part, 0.1 to 5 parts by weight of a polycarboxylic acid-based high fluidizing agent, and 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of water-soluble modified latex, 0.1 to 2 parts by weight of alkoxy silane hydrolyzate, and 0.1 to 3 parts by weight of a siliconate-based liquid component,

0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of petrocoke desulfurized gypsum, 0.5 to 10 parts by weight of plaster, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 10 parts by weight of slag 5 parts by weight and a powder component containing 0.1 to 2.0 parts by weight of barium oxide,

It is characterized in that it comprises 0.1 to 2 parts by weight of the active accelerator and 0.01 to 1 part by weight of the lithium-based reaction accelerator.

In addition, 2 to 3 parts by weight of an additive may be mixed for heat dissipation with the upper film layer based on 100 parts by weight of the total mixture of cement, blast furnace slag fine powder, and durability enhancing components.

Here, the additive is a nano-metal powder with a particle size of 5 to 7 nm, a metal powder with a particle size of 5 to 10 μm mixed in a weight ratio of 1: 12 to 13, and a mixed metal powder with a concrete composition It may include an eco-friendly resin composition that fuses, and the micro-metal powder forms a dense flake structure layer on the surface of the concrete.

Since nano-metal powders with a particle size of 5 to 7 nm are filled in the spaces between the micro metal powders with a particle size of 5 to 10 μm or the voids present on the surface of the concrete, the strength of the mortar composition (filling material) itself increases and the dense shielding film on the surface can form

Since the amount of the nanometal powder is sufficient to fill the space between the micrometal powder or the void on the surface of the concrete, the mixed metal powder is a mixture of the micrometal powder and the nanometal powder at a weight ratio of 12 to 13: 1. The mixed metal powder and the eco-friendly resin composition are mixed at a weight ratio of 1: 3 to 4 in consideration of the shielding performance of concrete and the adhesive performance of metal powder.

Here, the micrometal powder is copper (Cu), aluminum (Al), titanium (Ti), magnesium (Mg), potassium (K), calcium (Ca), sodium (Na), iron (Fe), chromium (Cr) ) is selected and mixed with one or more from the group consisting of, and the nano-metal powder is stainless steel, aluminum (Al), titanium (Ti), zinc (Zn), iron (Fe), tungsten (W), nickel (Ni ), characterized in that at least one is selected from the group consisting of lead (Pb) and mixed.

On the other hand, the eco-friendly resin composition is physicochemically combined with metal powder to realize strong adhesive performance with concrete, and serves to prevent salt damage and carbonation, and to block penetration of harmful substances.

To this end, a high-solid type PLA composite resin that can lower the VOC content of the volatile organic solvent below the legal standard by increasing the solid content to 60 to 95% by weight as an eco-friendly resin composition can be used.

Thus, the copolymer resin capable of forming various complex phases can contribute to improving the shielding properties and environmental resistance of the filler composition.

In one embodiment of the present invention, the PLA composite resin may form a foamed polyethylene mixture in which a polylactic acid (PLA)-based raw material corresponding to an environmentally friendly renewable material and a foaming agent are blended. More specifically, the PLA composite resin can be made based on other main raw materials, and the weight ratio of each raw material composition constituting the PLA (PolyLactic Acid)-based raw material can be performed according to the orderer's request.

Among PLA (PolyLactic Acid)-based raw materials, PLA is a thermoplastic polyester manufactured by polymerizing lactide or lactic acid obtained by fermenting renewable plants such as corn. It has eco-friendly characteristics.

PLA can be prepared by polymerization of lactic acid or lactide, and, if necessary, glycol compounds such as ethylene glycol or propylene glycol, dicarboxylic acids such as ethanedioic acid or terephthalic acid, glycolic acid, or 2-hydroxy It may be copolymerized with appropriate monomers such as hydroxycarboxylic acids such as benzoic acid or lactones such as caprolactone or propiolactone. In addition, PLA may be generally classified into D, L-PLA, meso-PLA, D-PLA, L-PLA, etc., but in the present invention, the PLA is not limited to those types, and the above-mentioned PLA is used alone or in combination of two or more. Can be used in combination.

In addition, in another embodiment of the present invention, 5 to 6 parts by weight of polyurethane, ethylene-vinyl acetate copolymer (EVA) 1 to 10 to 15 parts by weight of polyethylene based on 100 parts by weight of PLA (PolyLactic Acid) to reinforce strength It is possible to utilize a resin composition composed of 2 parts by weight to 2 parts by weight, and the PLA-based synthetic resin material manufactured by the resin composition as described above has a tensile strength, flexural strength, load deflection temperature, and Izod impact strength compared to eco-friendly recycled materials using only PLA. In addition to exhibiting improved performance, the manufacturing cost can be reduced because the composition material itself is inexpensive.

On the other hand, by mixing 1 to 2 parts by weight of the graphene on the additive with respect to the total weight of the nano-metal powder with a particle size of 5 to 7 nm, the micro-metal powder with a particle size of 5 to 10 μm, and the eco-friendly resin composition, heat dissipation Efficiency and strength can be improved.

In the present invention, graphene may be prepared using a simple liquid or powder graphene material or using a graphene fiber coated with nanocellulose.

The shape of the nanofibers corresponding to the graphene fibers used in the present invention is characterized by a very thin thickness. The thickness of the nanofibers used in the present invention is 5 nm or less, specifically, it is preferable to use those of 3 nm to 5 nm.

The nanocellulose parts by weight in 100 parts by weight of the graphene fiber composite coated with nanocellulose may be 10 to 15 parts by weight.

On the other hand, graphene constituting the graphene fiber used in the present invention not only has structural and chemical stability and excellent thermal conductivity, but also is composed of only carbon, which is a relatively light element, and is easy to process one-dimensional or two-dimensional fiber patterns. do. Due to these electrical, structural, chemical, and economic properties of graphene, graphene can be used as a rigid and elastic reinforcing sheet. When using graphene fibers as a rigid and elastic reinforcing sheet, it is preferable to put graphene fibers in a polymer and use them as a composite. Influenced by various factors such as methods, manufacturing of graphene fibers exhibiting better performance is continuously progressing. In order to evaluate the graphene fiber performance in the composite, the physical properties of the composite prepared therefrom should be evaluated. However, graphene fibers containing only pure graphene have weak mechanical strength due to micro- or nano-sized fiber structural defects, and are unstable due to the fact that they are weak against external forces applied in the axial direction of the fiber due to many structures ( brittle) and poor handling, so to reinforce this, graphene fibers coated with nanocellulose are used.

Here, through the coating process on the graphene fibers with nanocellulose in a honeycomb structure or diamond-shaped structure, the porous structure on the surface of the graphene fibers coated with nanocellulose primarily blocks moisture that can penetrate from concrete. A waterproof structure can be provided.

On the other hand, as a composition for slowing concrete cracking in the filler composition to which the above-mentioned functional additives are added, the nano-metal powder with a particle size of 5 to 7 nm, the micro-metal powder with a particle size of 5 to 10 μm, and the eco-friendly resin composition 1 to 2 weight ratio for the mixture, and the graphene fiber coated with graphene or nanocellulose is further mixed at 1 to 2 weight ratio with respect to the total weight of the nanometal powder, micrometal powder, and eco-friendly resin composition 100 Heat dissipation efficiency can be improved by mixing 0.4 to 0.6 parts by weight of nano PCM capsules with respect to parts by weight.

Nano PCM capsule (nano type Phase Change Material capsul) is added, which is a nano PCM capsule phase change material, which is formed of a material that repeatedly changes into a solid, melting, absorbing thermal energy, liquid, condensing, releasing thermal energy, and solid. In addition, it is preferable to utilize PCM-16 as the PCM used in the nano PCM capsule.

On the other hand, the nano PCM capsule in the present invention has characteristics for phase change material, size 7/1000000 mm (7 nm), ion repellency, anion resin, convection, excellent heat dissipation / diffusivity, etc., and after the filling composition is cured, the external For latent heat provided from a heat source other than the atmosphere, heat transfer to neighboring layers of a concrete structure that has been repaired and reinforced can be effectively dispersed through thermal diffusion and heat transfer throughout the mortar composition through thermal diffusion and heat transfer.

In the present invention, when the content of nano PCM capsules is less than 0.4 parts by weight, the heat dissipation efficiency is lowered, and when it exceeds 0.6 parts by weight, the compressive strength of the concrete layer produced is lowered.

Meanwhile, hereinafter, cement, blast furnace slag fine powder, and durability enhancing components excluding additives among the components constituting the filling material used in the method for repairing and reinforcing damaged parts of concrete structures according to the present invention will be described in detail.

First, in the present invention, the cement may be one or a mixture of two or more selected from general Portland cement (OPC), slag cement, alumina cement, and ultra-fast cement, and is preferably general Portland cement. Specifically, in the case of Portland cement, the main components are C ₃ S 51%, C ₂ S 25%, C ₃ A 9%, C ₄ AF 9%, CaSO ₄ 4%, and the specific surface area is around 3,300 cm ² /g It is preferable to use the

When mixed cement is used, it may include 40 to 70% by weight of Portland cement, 5 to 25% by weight of alumina cement, and the remaining amount of ultra-fast cement.

Among them, alumina cement is a cement with a relatively high alumina content compared to ordinary Portland cement, has excellent chemical resistance, can be used in an acidic atmosphere, and is a type of early-strength cement with a short hardening time, and is suitable for use with ordinary Portland cement. use in proportion

In addition, it is preferable to use super-fast-setting cement containing anhydrite and 50% by weight or more of alumina or calcium sulfoaluminate (CSA) and having excellent initial adhesion.

Blast furnace slag used in the present invention is an industrial by-product produced in the process of making pig iron in a blast furnace. In the blast furnace, raw materials such as iron ore, coke, and limestone are input from the top, and hot air is blown from the tuyere at the bottom to burn coke in the furnace. The resulting reducing gas (CO) reduces and dissolves iron ore to separate molten iron and molten slag. Granulated blast furnace slag is a product obtained by rapidly cooling molten high-temperature slag with water or air. About 300 kg is produced per 1 ton of pig iron, and the slag produced in the blast furnace is in a high-temperature molten state of 1,500 ° C or higher, and becomes slag with completely different physical properties depending on the difference in the cooling method. From high-temperature melting performance, by heat treatment and processing, it becomes fibrous, granular, porous lightweight lava or dense rock-like large lumps, and becomes glassy, semi-crystalline and crystalline.

Water-cooled slag is quenched with a large amount of water, solidifies without atomic arrangement due to rapid rise in viscosity, and becomes glassy (non-hard). The main chemical components are gangue of iron ore and ash of coke. It consists of SiO ₂ , CaO, MgO and Al ₂ O ₃ from limestone, etc., and accounts for about 95% of the total chemical composition. In addition, it contains a small amount of sulfur and alkali (Na ₂ O, K ₂ O).

Even if the quenched blast furnace slag simply comes into contact with water, dense hydrates are formed and coated, and further hydration is inhibited. However, in alkaline solutions such as Portland cement (PC) and slaked lime, the dense film is broken and begins to self-hydrate like PC clinker. In addition, since there is generally enough Ca ²⁺ and SO _42- in the liquid phase, the elution of acidic components of silicates and aluminates from slag is increased, and pozzolanic reaction also occurs in the liquid phase of the capillary pores of the hardened cement body. Therefore, the mixability and dispersibility as an admixture are excellent, the hardened body is dense, the strength development is improved, and durability against erosion from the outside is exhibited.

In general, the fine powder of quenched blast furnace slag tends to have higher reactivity as the basicity and glassiness rate increase. .

On the other hand, the slow-cooled blast furnace slag is gradually cooled in the air to form a mass, to become crystalline, which is a chemically stable structure, and has little hydraulic property. Slowly cooled blast furnace slag has a porous shape due to the generation of a large amount of gas inside the slag during the cooling process, and this shape shows a faster grinding effect than quenched blast furnace slag when pulverizing slowly cooled blast furnace slag.

Slow-cooled blast furnace slag, unlike blast-furnace quenched slag, is composed of crystals, and the boundary of each particle acts as a defect, resulting in high crushing ability. It is known that the surface is densified by the reaction to suppress neutralization.

The present invention is a technology for using the quenched blast furnace slag and slowly cooled blast furnace slag together with fine powder as concrete in a pile embedding method for ground foundation reinforcement.

In the present invention, the quenched blast furnace slag powder and the slowly cooled blast furnace slag powder preferably have a fineness of 4,200 to 4,280 cm ³ /g.

In the present invention, the durability enhancing component is 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of anhydrous sodium sulfate, 0.1 to 2.0 parts by weight of nano metal oxide powder, 0.1 to 5 parts by weight of a vinyl acetate-based polymer, 0.1 to 5 parts by weight of an expanding material, 0.1 to 5 parts by weight of a polycarboxylic acid-based high fluidizing agent and 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of water-soluble modified latex, 0.1 to 2 parts by weight of alkoxy silane hydrolyzate, and 0.1 to 3 parts by weight of a siliconate-based liquid component,

0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of petrocoke desulfurized gypsum, 0.5 to 10 parts by weight of plaster, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 10 parts by weight of slag 5 parts by weight and a powder component containing 0.1 to 2.0 parts by weight of barium oxide,

0.1 to 2 parts by weight of the active accelerator and 0.01 to 1 part by weight of the lithium-based reaction accelerator.

In the filler composition according to the present invention, environmentally friendly fibers, anhydrous sodium sulfate, nanometal oxide powder, vinyl acetate polymer, expandable material, polycarboxylic acid-based high flow agent, and silica sand are mixed as durability enhancing components, and liquid components, powder components and It is composed of a mixture of accelerator components.

Specifically, 0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of anhydrous sodium sulfate, 0.1 to 2.0 parts by weight of nano metal oxide powder, 0.1 to 5 parts by weight of vinyl acetate-based polymer, 0.1 to 5 parts by weight of expansion material, polycarbonate-based high fluidization 0.1 to 5 parts by weight, including 30 to 150 parts by weight of silica sand,

0.1 to 5 parts by weight of water-soluble modified latex, 0.1 to 2 parts by weight of alkoxy silane hydrolyzate, and 0.1 to 3 parts by weight of a siliconate-based liquid component,

0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of petrocoke desulfurized gypsum, 0.5 to 10 parts by weight of plaster, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 10 parts by weight of slag 5 parts by weight and a powder component containing 0.1 to 2.0 parts by weight of barium oxide,

It is formed by mixing an accelerator component including 0.1 to 2 parts by weight of an active accelerator and 0.01 to 1 part by weight of a lithium-based reaction accelerator.

The fiber used in the present invention may use at least one of glass fiber, carbon fiber, aramid fiber, and eco-friendly fiber, and prevents sagging of the mortar composition (filling material) according to the present invention, waterproofing film cracks, and the like, and prevents heat resistance. and excellent cold resistance. Here, the fiber can form a tight structure with a fine net structure to prevent cracking of the mortar and extend its lifespan.

In the present invention, eco-friendly fibers may be used as the fibers, and specifically, lyocell fibers, cellulose fibers, PLA fibers, and the like may be used.

The Lyocell fiber is a representative eco-friendly new fiber that does not use toxic chemicals such as carbon dioxide and caustic soda as a solvent, and the manufacturing process is simple and the solvent can be recovered and reused, so it is eco-friendly and economical. .

Lyocell fiber is produced by directly dissolving natural pulp in a non-polluting amine oxide solvent without any chemical transformation and uses only cellulose extracted without any chemical transformation. It is characterized by the absence of occurrence.

More specifically, the physical properties of lyocell fiber include high tensile strength, excellent hygroscopicity (excellent crack control performance), eco-friendliness due to the use of eco-friendly solvent amine oxide, and biodegradability even when discarded, resulting in non-pollution and excellent durability (acid resistance, resistance to acid). chemistry).

Lyocell fibers may be used alone, but in order to improve strength, a PLA composite resin including a PLA composite coated with cellulose nanofibers and lyocell fibers may be mixed and used at a weight ratio of 6 to 7:3 to 4.

That is, to produce a PLA composite coated with cellulose nanofibers, cellulose nanofibers were prepared by TEMPO ((2,2,6,6-tetramethylpiperidin-1-yl)oxy) commercial wood pulp (hardwoods or conifers). It can be used after oxidation using a mechanical treatment (yield of 90% or more), and the carboxyl group content is 3.2 to 3.9 mmol / g, the cellulose fiber width is 20 to 30 nm, and the fiber length is 50 to 60 μm. It is preferable to use

That is, it can be produced by coating the surface of a PLA (PolyLactic Acid) composite with cellulose nanofibers in a mesh type, and it is preferable to use 15.2 to 17.4 parts by weight of cellulose nanofibers based on 100 parts by weight of the PLA composite.

When the surface treatment is performed by coating with a mesh type, which is a PLA composite coated with such cellulose nanofibers, both tensile strength, bending resistance, and bursting strength can be improved compared to simply using the PLA composite.

In addition, the PLA composite coated with cellulose nanofibers has a high specific surface area, specific strength and low density of cellulose nanofibers, so it not only exhibits excellent physical properties, but also can obtain a composite with excellent thermal and mechanical properties even with a very small amount, and is environmentally friendly It can be applied with strength and light weight characteristics.

On the other hand, PLA is a natural plant-based raw material with corn starch as the main raw material, and does not contain synthetic resins (PC, ABS, etc.) and is 100% decomposed under natural conditions. In addition, it is possible to prevent the generation of harmful substances such as dioxin and other environmental pollution. PLA (PolyLactic Acid) can replace injection and extrusion plastics, and can be commercialized as a groundbreaking eco-friendly resin with general-purpose physical properties. On the other hand, PLA has properties such as crystallinity, natural circulation, biocompatibility, CO ₂ reduction, etc., and PLA is a plant-based raw material and is an eco-friendly material that can naturally decompose products.

The PLA composite used in the present invention is produced in the form of a sheet by putting PLA short fibers and carbon fibers in a weight ratio of 5.1 to 7.3: 1.2 to 2.3 in a carding machine to form a web, or PLA corresponding to natural fibers. A sheet layer prepared by mixing short fibers and synthetic fibers may be foamed and used. As the synthetic fiber used in the present invention, low-melting polyester, polyester, or polypropylene may be used alone or in combination, and polypropylene is preferably used. At this time, the mixing ratio of synthetic fiber and natural fiber is not particularly limited, but 12 to 15 parts by weight of synthetic fiber, 2 to 3 parts by weight of loess, 2 to 5 parts by weight of tidal flat soil (mud), amphibole, based on 100 parts by weight of natural fiber 1 to 2 parts by weight of powder, 1.5 to 1.8 parts by weight of ore powder, 4.2 to 4.5 parts by weight of curing agent, and 20 parts by weight of water, optionally colored ore powder may further include ore powder having a desired color. The synthetic fibers in the mixing process of PLA short fibers and synthetic fibers may have a thickness of 20 to 30 denier and a length of 43 to 56 nm.

On the other hand, the weight ratio of the PLA composite coated with cellulose nanofibers and the PLA resin on the PLA composite resin containing the PLA composite coated with cellulose nanofibers is 3 to 4: 6 to 7, which has tensile strength, bending resistance, and The result of the measurement of bursting strength can obtain a significant effect compared to other ratios.

Next, in the present invention, the anhydrous sodium sulfate serves to promote initial hardening and improve strength, and in particular, serves to improve resistance to freezing and thawing. In the present invention, the anhydrous sodium sulfate is preferably included in the range of 0.1 to 5 parts by weight in the durability enhancing component. If the content of the anhydrous sodium sulfate is less than 0.1 parts by weight, initial hardening may be delayed and resistance to freeze hardening may be reduced, and if it exceeds 5 parts by weight, the volume of the mortar may increase and the strength may decrease.

Next, in the present invention, the nano-metal oxide powder has a nano-sized particle size and has a porous internal structure with a large absorption cross-sectional area, and is characterized in that it has a high water absorption rate and improves resistance to microorganisms.

In the present invention, the nano-metal oxide powder is composed of palladium oxide, iridium oxide, ruthenium oxide, osmium oxide, rhodium oxide, platinum oxide, iron oxide, nickel oxide, cobalt oxide, indium oxide, aluminum oxide, titanium oxide, tungsten oxide and magnesium oxide. One or a mixture of two or more selected from the group consisting of may be used.

In addition, in the present invention, the nano-metal oxide powder may be used in an unprocessed form, but it is preferable to use a coated one to prevent fusing with each other in the composition, and specifically, the surface is coated with graphite oxide. It is preferable to use the

In the present invention, the graphite oxide is obtained by treating at least one type of graphite selected from natural graphite, plate-like graphite, artificial graphite, expanded graphite, and the like with an oxidizing agent such as sulfuric acid, nitric acid, potassium permanganate, and calcium chlorate, and the nano-metal oxide powder is The method of coating the surface with an oxide is to first mix nano metal oxide powder and graphite oxide in a certain ratio, add a small amount of water to form a slurry, and then irradiate ultraviolet rays so that the graphite oxide is combined with the nano metal oxide powder. A method of forming a coating layer on the surface is used.

As such, the nano-metal oxide powder having a coating layer formed on the surface is not easily refused with each other, thereby improving dispersion stability.

Subsequently, the vinyl acetate-based polymer is added to increase old and new adhesion and reduce the amount of rebound. The vinyl acetate-based polymer serves to increase fluidity and improve workability of the mortar composition (filler) according to the present invention before curing, and increases cohesion, flexural strength, and flexibility after curing of the mortar according to the present invention. It exerts effects such as enhancement and increase of waterproofing ability.

The expansion material is for suppressing cracks due to shrinkage during curing of the mortar according to the present invention, and when it is less than the critical value, the expansion effect is small and the crack suppression effect cannot be obtained.

Such an expandable material consists of 100 parts by weight of a fiber reinforcement, 30 to 65 parts by weight of an inorganic expandable material, 3 to 5 parts by weight of a metal powder-based expandable material, 2 to 3 parts by weight of a stabilizer, 25 to 35 parts by weight of a strength enhancer, and 15 to 25 parts by weight of an alkali irritant. Expansion materials may be used.

That is, the inorganic expandable material constituting the expandable material is configured to suppress cracks caused by drying shrinkage after hardening of the mortar by expanding to compensate for shrinkage after hardening of the mortar.

This configuration is used in consideration of shrinkage after curing, which is a disadvantage of cement. If the value is less than the critical value, the expansion effect is insignificant, making it impossible to suppress shrinkage cracking. The problem of this rapid deterioration occurs.

In addition, the fiber reinforcement constituting the expansive material is used to improve and reinforce the mechanical properties while suppressing the increase in tensile strength of concrete and the generation and growth of local cracks, dispersing and using discontinuous and single-phase fibrous materials in the mortar.

Subsequently, the polycarboxylic acid-based high fluidizing agent is adsorbed on the surface of the particles of the mortar and gives an electric charge to the particle surface to cause mutual reaction between the particles, thereby dispersing the agglomerated particles to increase the flow and increase the strength due to the water reducing effect. play a role in

As the glidant, melamine sulfonic acid, naphthalene sulfonic acid, polycarboxylic acid, lignin sulfonic acid, or alkylaryl sulfonic acid fluidizer may be used in addition to polycarboxylic acid, and more specifically, lignin sulfonate, polynaphthalene sulfonate, and polymelamine sulfonate. It is possible to use alone or in combination of two or more from the group consisting of nate or polycarboxylate-based water reducing agents.

In particular, since the use of a fluidizing agent affects the setting time, a setting time regulator may be appropriately included and used.

Subsequently, the silica sand is used as a mortar mixture, and it is preferable to use filaments having an average particle diameter of 0.3 to 1.5 mm, which is to improve the fluidity and compactness of the filling material according to the present invention.

Next, in the present invention, the water-soluble modified latex is a synthetic resin-based emulsion latex, specifically, 10 to 20 parts by weight of acrylic resin, 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber) rubber, and 0.1 to 5 parts by weight of hydroxyl acrylate monomer , 15 to 30 parts by weight of unsaturated polyester resin, 0.1 to 5 parts by weight of gallic acid, 1 to 10 parts by weight of metal cations, 0.1 to 2.0 parts by weight of graphite solvent dispersion, 0.5 to 5 parts by weight of dispersant, and 40 to 70 parts by weight of water. It is preferable to use

The acrylic resin is 2-hydroxyethyl methacrylate (2-HEMA: 2-hydroxyethyl methacrylate), methyl methacrylate (MMA: methyl methacrylate), n-butyl acrylate (n-BA: n-butyl acrylate), and A polyacrylate hybrid emulsion synthesized by adding any one acrylate monomer selected from acrylic acid (AAc) and an anionic or nonionic emulsifier and an initiator may be used. The acrylic resin dries quickly and exhibits excellent weather resistance, durability, and UV stability even under external exposure conditions, and is water-soluble and therefore environmentally friendly.

The SBR rubber preferably uses a resin having a solid content of 50% or more to maintain elasticity. It serves to prevent corrosion on the surface and at the same time is dispersed in a solvent, and also serves to increase the effect of gallic acid by dispersing and dissolving the gallic acid in a solution state. An ethylene glycol-based dihydric alcohol may be used as the solvent.

The hydroxyl acrylate monomer functions to improve physical properties by serving to increase the network state by improving the crosslinking density. As such a hydroxyl acrylate monomer, hydroxyl ethyl acrylate, hydroxyl propyl acrylate, hydroxyl ethyl methyl acrylate and the like can be used.

The unsaturated polyester is formed by condensation polymerization of an acid and a glycol compound, and for example, one formed by reacting fumaric acid with diethylene glycol and having an acid value in the range of 18 to 20 mg/KOH may be used. The unsaturated polyester serves to enhance the weather resistance, light resistance and scratch resistance of the mortar.

The gallic acid is a compound having a molecular formula of C7H6O5·H2O as a phenolcarboxylic acid obtained by acid or alkali hydrolysis of tannin, and serves to improve surface rust prevention and waterproofness.

As a specific example of the metal cation, one or two or more selected from among Ca ²⁺ , Mg ²⁺ , Zn ²⁺ , Cu ²⁺ , and Fe ²⁺ may be used.

The graphite solvent dispersion serves to improve strength characteristics such as tensile strength and compressive strength of mortar, and at the same time serves to improve corrosion resistance and waterproofness.

In the present invention, the graphite solvent dispersion is preferably used in a form in which graphite particles are dispersed in a solvent.

The graphite powder has a very large specific surface area of about 2,000 to 3,500 m ² /g, and excellent durability because it has excellent tensile strength and high airtightness.

Since the graphite powder has a problem in that it is not easy to use because the powder is too large, it is preferable to use it as a dispersion in a solvent.

In the present invention, in order to form the graphite solvent dispersion, graphite powder is mixed with water, acid is added, stirred and dispersed at pH in the acid range, and then alkali is added to adjust the pH in the neutral range, and the graphite content is 0.001 to 20 in the dispersion It is preferable to use those included in weight percent.

In the present invention, adding the acid (eg, hydrochloric acid, citric acid, acetic acid, etc.) is to improve the dispersibility in the solvent, and adding an alkali (eg, NaOH, KOH, etc.) improves stability by adjusting the pH to a neutral region it is to do

In the present invention, in forming the graphite solvent dispersion, it is preferable to use water as a solvent, but it is also possible to use alcohol alone or in combination with water.

The dispersant is to improve uniformity by evenly dispersing internal components in the liquid phase when mixing the water-soluble latex. Either one can be used.

In the present invention, the alkoxy silane hydrolyzate may be obtained by forming silane in the form of silica gel through a sol-gel process, introducing methyl methacrylate into the pores of the thus obtained silica gel, and then polymerizing and hydrolyzing it. In the present invention, the content of the methyl methacrylate may be included in the range of 0.5 to 5 parts by weight based on 100 parts by weight of the alkoxy silane content.

In the present invention, the siliconate-based liquid component includes 0.1 to 5 weight ratio of potassium methylsiliconate, 0.1 to 5 weight ratio of 3-iodo-2-propynyl-N-butyl carbamate, 0.1 to 10 weight ratio of epoxy binder resin, and It is composed of including in a ratio of 0.1 to 5 weight ratio of an inorganic polymer containing a fluorine (F) group.

In the present invention, the potassium methylsiliconate serves to penetrate the reinforcing component of the filler composition according to the present invention into the concrete and at the same time serves to increase water repellency. In the present invention, the potassium methylsiliconate is preferably included in the range of 0.1 to 3 weight ratio in the siliconate-based liquid component. In the present invention, it is more preferable to use the potassium methylsiliconate having a solid content of 30 to 40% by weight and a pH of 12 to 14.

In addition, in the present invention, when the 3-iodo-2-propynyl-N-butyl carbamate is used in the filler composition according to the present invention, it prevents various harmful components from eluting to the outside to prevent environmental pollution. It works. In the present invention, the 3-iodo-2-propynyl-N-butyl carbamate is preferably included in the range of 0.1 to 5 weight ratio in the siliconate-based liquid component.

In addition, in the present invention, the epoxy-based binder resin serves to enhance the bonding strength between each component of the composition and to increase mechanical strength and watertightness.

In the present invention, it is preferable to use the epoxy-based resin, and its content is preferably included in the range of 0.1 to 10 weight ratio in the siliconate-based liquid component.

In the present invention, the inorganic polymer containing the fluorine (F) group serves to prevent corrosion by acid by enhancing acid resistance when the surface is exposed to acidic conditions after the filler composition according to the present invention is cured. . In the present invention, the inorganic polymer containing a fluoro (F) group is preferably a mixture of alumino silicate and fluoro alkali silicate in a weight ratio of 50 to 65:35 to 50. When the content of the alumino silicate is less than the above range, there is a problem of strength deterioration, and when it exceeds the above range, cracks may occur due to surface drying of the cured body.

In the present invention, the inorganic polymer containing the fluorine (F) group is preferably included in the range of 0.1 to 10 weight ratio in the siliconate-based liquid component. If the content is less than 0.1 weight ratio, the acid resistance enhancing effect is insignificant, and if the content exceeds 10 weight ratio, compatibility may be a problem.

In the present invention, the clinker is composed of calcium silicate such as allite, berite and celite. The clinker serves to promote mixing of the powder component and the liquid component. The clinker is preferably included in the range of 0.5 parts by weight to 10 parts by weight. When the content of the clinker is less than 0.5 parts by weight, mixing of the powder component and the liquid component is not easy, and when it exceeds 10 parts by weight, the strength is There is a problem with deterioration.

In the present invention, the petro-coke desulfurization gypsum destroys the acidic film of the blast furnace slag to accelerate the release of ions inside the slag and reacts with them to produce a large amount of ettringite in the early stage of hydration, and calcium It plays a role in expressing strength by generating silicate hydrate.

The main components of the petro-coke desulfurization gypsum are CaO and SO ₃ , and the appropriate quality is 95% or more of CaSO ₄ 2H ₂ O, 1.5% or less of unreacted CaCO ₃ , 0.5% or less of CaSO ₃ 1/2H ₂ O, and Al ₂ O ₃ +Fe ₂ O ₃ must be less than 1.0% at most, and pH must be 5-9. Compared to phosphate gypsum, it is relatively neutral in pH and has a high purity and uniform quality.

In the present invention, the petro-coke desulfurization gypsum preferably has a density of 2.65 to 2.75 g/m ³ , and preferably has a powder degree of 4,430 to 4,4520 cm ³ /g.

In the present invention, the plaster serves to easily mix the ingredients included in the powder ingredients with the liquid ingredients. The plaster is preferably included in the range of 0.5 parts by weight to 10 parts by weight. Therefore, when the content of the plaster is less than 0.5 parts by weight, it is difficult to easily mix various components included in the powder component with the liquid component, , When it exceeds 10 parts by weight, there is a problem in that strength and chemical resistance are lowered.

The silica fume is an amorphous active silica with an average particle diameter of about 0.15 μm, and is a particle close to a perfectly spherical shape. Silica fume improves waterproofness and chemical resistance by the filling effect between the powder component particles due to the characteristics of the spherical particles, and serves to improve the strength of the cured body. The silica fume is preferably included in the range of 0.1 part by weight to 5 parts by weight. If the content of the silica fume is less than 0.1 part by weight, there is a problem in that the water resistance and chemical resistance of the cured body are lowered and the strength is lowered, and the 5 parts by weight If it exceeds the part, there is a problem that cracks may occur.

The fly ash is a facility that uses coal as a fuel, such as a thermal power plant, and the remaining components remain in the form of oxides after burning coal, remaining as fine dust of silicon oxide (SiO ₂ ) or aluminum oxide (Al ₂ O ₃ ) components means that When the fly ash is mixed with the coating agent and used, workability is improved and long-term strength and watertightness are improved, which is economical. The fly ash is preferably included in the range of 0.01 parts by weight to 5 parts by weight. If the content of the fly ash is less than 0.01, the strength performance of the hardened body is lowered, and if it exceeds 5 parts by weight, the chemical resistance is lowered. there is

The limestone serves to supplementally improve the stiffness of the filler composition according to the present invention. The limestone is preferably included in the range of 0.5 parts by weight to 10 parts by weight. If the content of the limestone is less than 0.5 parts by weight, the effect of improving stiffness is reduced, and if it exceeds 10 parts by weight, chemical resistance is lowered. there is.

The slag is preferably included in the range of 0.01 parts by weight to 5 parts by weight. If the content of the slag is less than 0.01 parts by weight, durability, chemical resistance and waterproofness may deteriorate, and if the content exceeds 5 parts by weight, cracking occurs. This can occur and there is a problem of increasing weight.

In the present invention, the barium oxide is used to improve the mechanical strength of concrete and prevent whitening, and for example, barium sulfate may be used.

In the present invention, the active accelerator is used to control the initial setting rate, and serves to activate the function of concrete and enhance strength performance, for example, active multivalent metal ions of calcium, magnesium, manganese or aluminum. It is possible to use a chloride salt, carbonate salt, sulfate salt or oxalate containing salt, the amount is preferably used in the range of 0.5 to 2 parts by weight.

In the present invention, the lithium-based reaction accelerator promotes the production of cement hydrate after setting (termination) to affect the development of strength and to make the micropores denser. For example, lithium carbonate, lithium sulfate, lithium hydroxide, Lithium oxide, lithium chloride, lithium phosphate, lithium nitride, lithium silicate, etc. may be used, and the amount thereof is preferably used in the range of 0.5 to 1 part by weight.

In addition, the filler composition according to the present invention may further include a filler. The filler is characterized in that the particle diameter is 2 μm or less, and may be a group consisting of silicon dioxide (SiO2), aluminum oxide (Al2O3), calcium carbonate (CaCO3), talc, or a mixture thereof.

In the present invention, when the concrete structure is an underwater structure, the filling material of (e) may additionally use underwater mortar, underwater ready-mixed concrete, or a mixture of fine aggregate and underwater mortar.

In particular, in the case of the underwater-only mortar, fast-setting cement is prepared including 100 parts by weight of artificial marble waste powder, 20 to 50 parts by weight of a slag-containing mixture, and 20 to 40 parts by weight of phosphoric acid dihydrate gypsum or flue gas desulfurization dihydrate gypsum. Then, 20 to 50% by weight of fast-hardening cement, 30 to 60% by weight of Portland cement, 5 to 20% by weight of cellulose fiber, and 5 to 10% by weight of EVA resin were mixed to obtain a binder component, and then the obtained binder An underwater-only mortar obtained by mixing 20 to 50 wt% with 10 to 30 wt% of filler, 30 to 69 wt% of aggregate, and 0.1 to 3 wt% of an insoluble in water separator may be used.

Figure 4 shows an example of the assembly type anchor body used in the present invention, Figure 5 shows another example of the assembly type anchor body used in the present invention.

4 and 5, the prefabricated anchor body 100 used in the present invention includes an anchor body 102 largely formed in an L shape in the middle, an anchor base for binding the anchor body to a cross section 104 and an anchor bar 101 that is inserted into the insertion hole 103 of the anchor body 102 in an interference fit form to increase the physical adhesion of the filling material.

As shown in the drawing, the anchor body has a bottom part and an extension part connected in an L shape, and the bottom part is fixed to the anchor base by a head and a nut (not shown) provided in the anchor base, and the extension part has a singular or A plurality of insertion holes 103 are provided. The length of the extension part and the number of insertion holes may be determined and used in the field according to the depth of the damaged part to be restored. That is, when the depth of the damaged part is shallow, one having only a single insertion hole formed in the extension part may be used, and when the depth of the damaged part is deep, several insertion holes formed in the extension part are provided to anchor each insertion hole. Bars can also be inserted and used on site.

In addition, depending on the size (area) of the damaged part, an anchor bar having a suitable length may be selected and used.

Figure 6a is a view showing an example of an assembly type anchor body to which the twist type anchor body used in the present invention is applied, and Figure 6b is a view showing an anchor bar inserted into the assembly type anchor body to which the twist type anchor body used in the present invention is applied. It is a drawing that represents

As shown in FIGS. 6A and 6B, when the anchor body 102 is made of a twistable member, the direction of the anchor bar 101 inserted into the insertion hole can be adjusted arbitrarily, so that the broken portion is horizontally and vertically. Suitable for large width. In addition, even when the depth of the cross section to be restored is the same, since a larger number of anchor bars can be fastened, the effect of increasing the attachment strength can be further increased.

7 is a front view showing cross-section repair and reinforcement using an assembled anchor body in which an anchor bar is inserted into the twisted anchor body used in the present invention.

As shown in FIG. 7, in the present invention, when the anchor body 102 is configured as a twisted anchor body, since the anchor bar can be configured in multiple directions (eg, radial) with only one anchor body 100, the anchor body 102 is configured as a twisted anchor body. It is possible to reduce the amount of use of (100) and drastically shorten the working time.

8 is a view showing an example of performing the repair and reinforcement method according to the present invention on a damaged part of a land concrete structure, and FIG. 9 shows an example of performing a repair and reinforcement method according to the present invention on a damaged part of an underwater concrete structure. It is a drawing that represents

As shown in FIGS. 8 and 9, the repair and reinforcement method according to the present invention can be widely used not only for repair and reinforcement of damaged concrete structures on land, but also for damaged concrete structures in water. When used for underwater concrete structures, the only difference is that the filling material is used exclusively for underwater use.

In the above, the concrete structure repair and reinforcement method using the prefabricated anchor body and panel according to the present invention has been described in detail.

Using the special construction method according to the present invention, it is possible to minimize the inconvenience of field workers because plastering work is not required, and in the case of an underwater structure, a diver fixes only the anchor base to the damaged section of the cross section in a simple way when fixing the anchor body, and then The work is finished by simply inserting the anchor bar (anchor rod), so the convenience of work can be maximized. In addition, it is possible to increase the efficiency of the work by allowing the repair and reinforcement work to be completed by injecting and curing the mortar filling material from the outside without requiring a separate plastering work, and using the panel to ensure the internal restraint of the filling material After repair work, the outer diameter of the structure can be prevented from being enlarged. In addition, the filler injected into the damaged portion constitutes a concrete composition using a binder containing fine powder of blast furnace slag, an industrial by-product, in addition to cement, and by using this, repair and reinforcement work is performed on the damaged portion of the concrete structure, thereby improving crack resistance and acid resistance. It is possible to maintain the repair and reinforcement effect for a long time by seeing effects such as improvement, tensile strength and durability improvement, salt damage resistance and freeze-thaw resistance improvement, and eco-friendliness and economic feasibility can be improved by recycling by-products generated at industrial sites.

Hereinafter, the present invention will be described in more detail based on examples. However, the scope of the present invention is not limited by the following examples.

[Example]

(Example 1)

The quenched blast furnace slag powder (basicity value 1.6 based on KS F 2563 standard) and the slowly cooled blast furnace slag powder having a density of 2.85 ~ 2.95 g/m ³ were selected, and the quenched blast furnace slag powder:slowly cooled blast furnace slag powder was 20:25, respectively. They were mixed and used in a weight ratio. The quenched blast furnace slag powder obtained as described above and the slowly cooled blast furnace slag powder were mixed at a ratio of 25 weight ratio of blast furnace slag, 50 weight ratio of cement (Portland cement), and 20 weight ratio of durability enhancing component, and an appropriate amount of water and aggregate were mixed. A mortar composition (filling material) containing the fine powder was obtained.

The durability enhancing component includes 2 parts by weight of lyocell fiber, 1 part by weight of anhydrous sodium sulfate, 0.5 parts by weight of nano metal oxide powder (platinum oxide), 1.5 parts by weight of a vinyl acetate-based polymer, 0.2 parts by weight of an expanding material, and a polycarboxylic acid-based high fluidizing agent 0.5 parts by weight, including 100 parts by weight of silica sand, acrylic resin (15 parts by weight), SBR rubber (15 parts by weight), unsaturated polyester resin (20 parts by weight), hydroxyl acrylate monomer (1 weight ratio), gallic acid (1 weight ratio), 8 parts by weight of a water-soluble modified latex obtained by mixing a metal cation (3 weight ratio), a graphite solvent dispersion (0.5 weight ratio) and a dispersant (1 weight ratio) and mixing with water was mixed. Then, silane was formed in the form of silica gel, methyl methacrylate was added to the pores of the silica gel, and 0.5 part by weight of an alkoxysilane hydrolyzate obtained by polymerization and hydrolysis was mixed, followed by 1 weight ratio of potassium methylsiliconate and 3-iodo-2. -2 weight ratio of propynyl-N-butyl carbamate, 5 weight ratio of epoxy binder resin and 1 weight ratio of inorganic polymer containing fluorine (F) group (a mixture of alumino silicate and fluoro alkali silicate at a weight ratio of 60:40) 3 parts by weight of the siliconate-based liquid component obtained by mixing with, 5 parts by weight of clinker, 5 parts by weight of petro coke desulfurized gypsum, 5 parts by weight of plaster, 5 parts by weight of desulfurized gypsum, 3 parts by weight of silica fume, 3 parts by weight of fly ash, After mixing 7 parts by weight of limestone, 3 parts by weight of slag, and 1 part by weight of barium oxide (barium sulfate), 1.0 parts by weight of an activation promoter and 1.0 parts by weight of a reaction promoter (a mixture of lithium carbonate, lithium sulfate, and lithium hydroxide) were obtained. used

(Comparative Example 1)

Based on 100 parts by weight of cement, 13 parts by weight of zeolite fine powder, 1.5 parts by weight of vinyl acetate polymer, 0.2 part by weight of expansion material, and 1.5 parts by weight of polycarboxylic acid-based high fluidizing agent are included, and formed by mixing additives, but the cement is Portland cement 40 It was produced by mixing at a weight ratio of 35 weight ratio of early steel cement and 30 weight ratio of slag cement, and a mortar composition was obtained by mixing an appropriate amount of water and aggregate.

(Comparative Example 2)

Based on 100 parts by weight of cement, 13 parts by weight of lyocell fiber, 1.5 parts by weight of vinyl acetate polymer, 0.2 part by weight of expansion material, and 1.5 parts by weight of a polycarboxylic acid-based high fluidizing agent were mixed and formed by mixing additives, but the cement was Portland cement It was created by mixing 40 weight ratio, 35 weight ratio of early steel cement and 30 weight ratio of slag cement, and mixing an appropriate amount of water and aggregate to obtain a mortar composition.

(Comparative Example 3)

Based on 100 parts by weight of cement, 4.5 parts by weight of vinyl acetate-based polymer, 1.0 part by weight of expansion material, and 1.5 parts by weight of polycarboxylic acid-based high flow agent are mixed and formed by mixing additives, but the cement is 40 parts by weight of Portland cement and 35 parts by weight of early strong cement and slag cement at a weight ratio of 30, and a mortar composition was obtained by mixing an appropriate amount of water and aggregate.

[Performance evaluation]

(1) Physical properties of mortar composition

A test body (cured body) was prepared using the mortar composition prepared in the above Examples and Comparative Examples, and physical properties were measured by the following test method.

1) Condensation time: KSF 2436

2) Bending strength: KS F 2476

3) Compressive strength: KSF 2405

4) Bond strength: KS F 4716

5) Length change rate: Measured according to KS F 2424 Mortar and Concrete Length Change Test Method. The value is the value of the initial construction body set to 0, “-” represents the shrinkage rate, and “+” represents the expansion rate.

6) Flow: carried out according to KS L 5220.

The results are shown in Table 1 below.

item Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Condensation time (minutes) first resolution 25 36 39 59 closing 31 55 60 110 flexural strength
(N/mm ² ) gin 10 5 6 7 underwater 8 4 4 5 compressive strength
(N/mm ² ) gin 15 13 12 13 underwater 13 10 9 11 adhesion strength
(N/mm ² ) gin 4.2 3.0 3.1 2.7 underwater 1.9 1.7 1.4 1.1 Length change rate (%) +0.005 +0.05 +0.03 +0.10 flow (mm) 89 150 141 139

As shown in Table 1, in the case of the filler composition according to the present invention, the physical properties are significantly superior to those of the conventional mortar composition, and in particular, not only the flexural strength and compressive strength in air and water are remarkably excellent, but also the rate of change in length is significantly relative It can be seen that it provides excellent performance.

(2) Other performance evaluation

1) Weather resistance evaluation

It was measured for 400 hours according to ASTM G 155.

2) Evaluation of surface hardness

Pencil hardness was measured according to KS D 6711.

3) Water resistance evaluation

The time for surface deformation (crack, blister, etc.) to occur continuously in hot water at 120° C. was measured.

The evaluation results are shown in Table 2.

Weather resistance (white) surface hardness water resistance Example 1 △E1.2 2H 520hrs Comparative Example 1 △E2.0 2H 420hrs Comparative Example 2 △E2.1 2H 450hrs Comparative Example 3 △E2.1 2H 420hrs

From the results of Table 2, when a cured product is prepared using the filler composition according to the present invention, physical properties such as weather resistance, water resistance and surface hardness are also excellent, so water resistance, environmental resistance, chemical resistance and durability in areas with poor environments are significantly improved. hopefully it can be

4) Chloride permeability

A chloride diffusion test was performed on the cured products prepared using the mortar compositions according to Examples and Comparative Examples, and the results are shown in Table 3.

test body Chloride diffusion coefficient (×10 ^-12 m ² /s) Example 1 8.5 Comparative Example 1 10.2 Comparative Example 2 12.0 Comparative Example 3 12.5

From the results of Table 3, it was confirmed that the cured body prepared using the filler composition according to the present invention was superior in terms of chloride permeability as well, lower than that of the comparative example.

The above has been described in detail with reference to the drawings and examples with respect to the repair and reinforcement method of the damaged part of the concrete structure using the prefabricated anchor body and the panel according to the present invention.

As described above, the present invention has been specifically described with respect to its characteristics with reference to the drawings, but the present invention can be variously modified and changed by those skilled in the art to which the present invention belongs, and these modifications and changes are of the present invention. It should be interpreted as belonging to the scope of protection.

10: underwater concrete structure 20: damaged part
30: panel guide 30-1: groove
31: anchor bolt 40: panel
41: anchor bolt 42: injection hole
50: filling material
100: anchor body 101: anchor bar
102: anchor body 103: insertion hole
104: anchor base

Claims (10)

(a) chipping the damaged part of the concrete structure, arranging the cross section, and measuring the depth and size of the damaged part;
(b) assembling panel guides on both sides of the damaged part of the concrete structure;
(c) An anchor body formed of an L shape in the arranged cross section and having a plurality of anchor bar insertion holes and an anchor body composed of an anchor base to bind the anchor body to the cross section is installed, and Inserting and fixing the number of anchor bars corresponding to the depth and size into the anchor bar insertion hole;
(d) inserting a panel manufactured to fit the width of the assembled panel guide into the panel guide and binding upper and lower ends of the panel to the concrete structure;
(e) injecting a filling material from the outside through an injection hole formed in the panel; and
(f) curing the filling material;
It is characterized in that it comprises,
The filler includes cement: blast furnace slag fine powder: durability enhancing component in a weight ratio of 40 to 60: 5 to 30: 5 to 30, respectively, as a binder, and a concrete structure characterized in that using a composition composed of mixing aggregate and water repair and reinforcement method for damaged parts.
The method according to claim 1, in assembling the panel guide to the damaged part of the concrete structure in the step (b), a partition wall is disposed in the middle of the broken part, and a panel guide in both directions is installed at an outer end of the partition wall, but the panel guide is installed in both directions The panel guide supports the bulkhead by binding and fixing to the upper structure of the damaged part, and the panel is inserted between the two-way panel guide and the left and right panel guides.
The method according to claim 1, characterized in that the anchor body constituting the L shape in step (c) can be twisted so that when a plurality of anchor bars are inserted into the anchor bar insertion hole, they can be inserted and installed in a radial manner. A repair and reinforcement method for damaged parts of concrete structures.
The method according to claim 1, when the concrete structure is an underwater structure, the fill material of (e) is an underwater mortar, an underwater ready-mixed concrete, or a mixture of fine aggregate and underwater mortar. repair and reinforcement method.
The method according to claim 4, wherein the underwater-only mortar is 100 parts by weight of artificial marble waste powder, 20 to 50 parts by weight of a slag-containing mixture, and 20 to 40 parts by weight of phosphoric acid dihydrate gypsum or flue gas desulfurization dihydrate gypsum 20 ~ 50% by weight; 30 to 60% by weight of Portland cement; 5 to 20% by weight of cellulose fibers; and 20 to 50 wt% of a binder composed of 5 to 10 wt% of EVA resin, 10 to 30 wt% of a filler, 30 to 69 wt% of an aggregate, and 0.1 to 3 wt% of a water-insoluble separator using an underwater mortar obtained by mixing Damaged part repair reinforcement method of concrete structure, characterized in that.
The method according to claim 1, wherein the durability enhancing component
0.1 to 10 parts by weight of fiber, 0.1 to 5 parts by weight of anhydrous sodium sulfate, 0.1 to 2.0 parts by weight of nano metal oxide powder, 0.1 to 5 parts by weight of vinyl acetate-based polymer, 0.1 to 5 parts by weight of expanding material, 0.1 to 5 parts by weight of polycarboxylic acid-based high fluidizing agent 5 parts by weight, including 30 to 150 parts by weight of silica sand,
0.1 to 5 parts by weight of water-soluble modified latex, 0.1 to 2 parts by weight of alkoxy silane hydrolyzate, and 0.1 to 3 parts by weight of a siliconate-based liquid component,
0.5 to 10 parts by weight of clinker, 0.5 to 10 parts by weight of petrocoke desulfurized gypsum, 0.5 to 10 parts by weight of plaster, 0.1 to 5 parts by weight of silica fume, 0.01 to 5 parts by weight of fly ash, 0.5 to 10 parts by weight of limestone, 0.01 to 10 parts by weight of slag 5 parts by weight and a powder component containing 0.1 to 2.0 parts by weight of barium oxide,
A method for repairing and reinforcing damaged parts of a concrete structure, comprising 0.1 to 2 parts by weight of an active accelerator and 0.01 to 1 part by weight of a lithium-based reaction accelerator.
The method of claim 6,
The blast furnace slag fine powder includes blast furnace quench slag and blast furnace slag in a weight ratio of 5 to 30: 5 to 30, respectively, and has a density of 2.85 to 2.95 g / m ³ Damage to concrete structures, characterized in that Minor repair and reinforcement method.
The method of claim 6,
The water-soluble modified latex includes 10 to 20 parts by weight of acrylic resin, 10 to 20 parts by weight of SBR (Styrene-Butadiene rubber) rubber, 0.1 to 5 parts by weight of hydroxyl acrylate monomer, 15 to 30 parts by weight of unsaturated polyester resin, and 0.1 to 5 gallic acid. Parts by weight, 1 to 10 weight ratio of metal cations, 0.1 to 2.0 weight ratio of graphite solvent dispersion, 0.5 to 5 weight ratio of dispersant, and 40 to 70 weight ratio of water. Reinforcement method for repairing damaged parts of concrete structures.
The method of claim 6,
The nano metal oxide powder is from the group consisting of palladium oxide, iridium oxide, ruthenium oxide, osmium oxide, rhodium oxide, platinum oxide, iron oxide, nickel oxide, cobalt oxide, indium oxide, aluminum oxide, titanium oxide, tungsten oxide and magnesium oxide. A method for repairing and reinforcing a damaged part of a concrete structure, characterized in that it is a mixture of one or two or more selected.
The method of claim 6,
The petro-coke desulfurization gypsum has a density of 2.65 ~ 2.75 g / m ³ Repair and reinforcement method for damaged parts of concrete structures.

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