KR102078343B1 - Quick-hardening concrete composition and repairing method using this - Google Patents

Abstract

The present invention relates to an acryl latex-modified ultra-quick hardening concrete composition using calcium aluminate-based amorphous reduction slag, and a repair and reinforcement method using the same. More specifically, amorphous reduction slag and latex compositions are contained in concrete used for pavement including a road to overcome limit at the low temperature of a material, such as C_4A_3S (hauyne), alumina cement and the like, provide excellent elongation rate and tensile force, increase adhesion with cement, and form a strong adhesion strength with a concrete base material. According to the present invention, the method comprises a cutting step, a surface treatment step, a preparation step, a deposition step, and a curing step.

Description

Acrylate modified superhard concrete composition using calcium aluminate-based amorphous reducing slag and repair reinforcing method using same {QUICK-HARDENING CONCRETE COMPOSITION AND REPAIRING METHOD USING THIS}

The present invention relates to an acrylic latex modified cemented carbide concrete composition using calcium aluminate-based amorphous reducing slag and a repair reinforcing method using the same. More specifically, the amorphous reducing slag and latex components are used in concrete used for pavement such as roads. It overcomes the limitations at low temperatures of existing materials such as C ₄ A ₃ S (Awine), Alumina cement, and has excellent elongation and tensile strength. The present invention relates to an acrylic latex modified cemented carbide concrete composition using calcium aluminate-based amorphous reducing slag and a repair reinforcement method using the same.

In general, the concrete structure is subjected to various natural or artificial effects after construction, the physical performance is degraded due to physical and chemical deformation depending on the service life. In particular, in recent years, efforts have been made to restore safety and functional performance by performing repairs to secure safety and performance of construction structures. Accelerated aging of such construction structures causes cross-sectional defects in the structure, ie, concrete, due to expansion pressure caused by reinforcing corrosion, freezing-thawing, carbonation (neutralization), and so on. In terms of safety, there are problems that can pose a danger to safety.

In addition, when the repair or reinforcement work is carried out to improve such a problem, the function of the structure should be stopped due to the need to suspend the work during the use of the structure.

On the other hand, most of the fast- or super-fast mortar currently used as a repair material is typically a mortar based on portland cement, and various kinds of mortars have been manufactured and used before. For example, there is a method of preparing mortar by adding CSA (calcium sulfoaluminate) or latex and adding a predetermined fine powder binding material. Most of these existing super fast or fast mortars are based on the reaction point of the formation of Ettringite, an expandable substance obtained by chemical reaction between cement and water. The aluminate mortar which has a main component, the calcium fluoro aluminate mortar which has C11A7 and CaF2 as a main component, and the subbase mortar which has CSA as a main component can be classified.

However, the aluminate-based mortar is not stable in the long term as the product is transferred to a secondary hydrate that exhibits a low strength after the hydration reaction, and particularly has a side that is vulnerable to calcium chloride, which may impair the durability performance. In addition, calcium fluoro aluminate-based and sub-type mortars are relatively superior in performance, but may require additional firing process and the process to be pulverized into fine powder may not be economical.

In addition, most of the mortar prepared through the alkali-activated material as described above is not fast-hardening, but fast-hardening is required for at least one day of strength development after mixing with water. For example, road repairs in winter, bridge repairs, construction in places where water is encountered, etc. are difficult to apply.

For this reason, to overcome the problems of the strength development time of mortar, super fast hard mortar is manufactured and used using alumina cement and jet cement developed in the cement industry, but due to the nature of the repair mortar exposed to the external environment, Its use is limited because it is very sensitive to the durability (freezing, carbonation, etc.) and outdoor temperature (dry shrinkage, etc.) related to the quality of mortar.

In order to solve this problem, Korean Patent Publication No. 10-2015-0047929 discloses 10 to 20 parts by weight of phosphate, 3 to 6 parts by weight of calcium silicate, 15 to 25 parts by weight of silica fume, 20 to 60 parts by weight of inorganic binder, and 5 to 5 parts of aluminum oxide. By including 10 parts by weight and 5 to 10 parts by weight of magnesium oxide, it is possible to repair the road in an environmentally friendly way without containing lime components, such as conventional Portland cement, and to solve the problem of delay in curing time in winter. Since the hardening time is faster than Portland cement, it is possible to repair the shortcomings of the road in a short time, thereby achieving an economical and stable effect.

However, in the prior art, it is not possible to construct by mixing only water without using a separate primer, and there is a problem in that it is insufficient to use in a freezer of water and cryogenic.

As a well-known technique for solving such a problem, Patent No. 10-1507765 discloses a composition that is applied to have a high compressive strength of 20 MPa or more and a high adhesion strength of 1.7 MPa or more after 30 minutes of mixing with water at an appropriate ratio. Magnesium oxide (MgO, light) and sodium monophosphate (NaH2PO4) calcined in the range of 600 ~ 700 ℃ as a 1: 1 wt. 0.2 by weight ratio to obtain a first composition, 30 kWh 10 parts by weight A crack mortar containing ceramic mortar composition is disclosed in a pavement comprising 100 wt% of calcium silicate (CaSiO 3) in 25 wt% 5 parts by weight, firing shell powder 15 wt 5 parts by weight, and silica sand 30 wt 10 parts by weight. .

 However, the composition according to the prior art has a problem that the characteristics such as compressive strength, adhesion strength, etc. are not enough yet to obtain the desired degree of properties when installed in the field.

In addition, latex modified cemented carbide concrete is generally used to take advantage of latex adhesion, flexibility, and waterproofness, but latex (SB latex or acrylic latex) coating is delayed in cement hydration reaction and initial reactive material. Etrinite is inhibited in the production of early strength expression is inhibited, and the delay of this initial hydration reaction occurs more frequently at relatively thin laying thickness during the season or Korea-China construction.

Therefore, the present invention has been made to solve the above problems,

The cemented carbide concrete composition can overcome the limitations at the low temperature of materials such as C ₄ A ₃ S (Awine), Alumina cement, etc. by including the reducing slag composed of amorphous calcium aluminate mineral in the cemented carbide concrete composition The purpose is to provide.

In addition, by further comprising a latex made of a terpolymer, an object of the present invention is to provide an ultra-high speed concrete composition excellent in elongation and tensile strength of the film compared to the conventional latex.

Furthermore, another object of the present invention is to provide a method of repairing and reinforcing using the cemented carbide concrete composition.

In order to achieve the above object, the acrylic latex modified cemented carbide concrete composition using calcium aluminate-based amorphous reducing slag according to the present invention is a reduced slag composed of portland cement, amorphous calcium aluminate (C ₁₂ A ₇ ) mineral, Ultra-fast cement containing calcium sulfo aluminate (CSA) and admixtures; And,

Characterized in that it comprises a; latex made of an acrylic terpolymer (terpolymer),

Repair reinforcement method using the cemented carbide concrete composition according to the present invention

Cutting step of cutting the pavement surface to be repaired by the cutting equipment;

Surface treatment step of removing, cleaning the foreign matter of the cut pavement surface;

Preparation step of preparing concrete by mixing and mixing the cemented carbide composition and water, fine aggregate, coarse aggregate of claim 1;

A laying step of placing the concrete on a pavement surface using a laying machine;

Curing step to cure by curing the poured concrete;

Characterized in that comprises a.

As described above, the acrylic latex modified cemented carbide concrete composition using calcium aluminate-based amorphous reducing slag according to the present invention and the road repair reinforcement method using the same are utilized within the cemented carbide using the rapid hydration characteristics of amorphous C ₁₂ A ₇ . Overcoming the limitations of low temperature materials such as C ₄ A ₃ S (Awine), Alumina cement, etc.The latex used for JY-EPC-4 is an acrylic terpolymer, Excellent tensile force and anionic functional groups on the surface of polymer particles react with strong (divalent, trivalent) cationic cement particle surface to increase adhesion to cement and form stronger bond strength with concrete base material. Can be.

1 is a block diagram of a method using a cemented carbide concrete composition according to the present invention
Figure 2 is a modification of the pouring device used when pouring cemented carbide concrete according to the present invention

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

Since the present invention may be modified in various ways and have various forms, embodiments (or embodiments) will be described in detail in the text. However, this is not intended to limit the present invention to the specific form disclosed, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In each of the drawings, the same reference numerals, in particular, the tens and ones digits, or the tens, ones and digits, refer to members having the same or similar functions, and unless otherwise specified, each member in the figures The member referred to by the reference numeral may be regarded as a member conforming to these criteria.

In addition, in the drawings, the components are exaggerated in size (or thick) in size (or thick) in size (or thin) or simplified in consideration of the convenience of understanding, but the protection scope of the present invention is limited in this way. It should not be.

The terminology used herein is for the purpose of describing particular embodiments (suns, aspects, and embodiments) (or embodiments) only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms “comprises” or “consists” are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, but one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and shall not be construed in ideal or excessively formal meanings unless expressly defined in this application. Do not.

First, the acrylic latex modified cemented carbide concrete composition using calcium aluminate-based amorphous reducing slag according to the present invention, and road repair reinforcement method using the same, are used in the cemented carbide composition, portland cement and amorphous calcium aluminate (C12A7) mineral. It consists of a reduced-speed slag, calcium sulfoaluminate (CSA) and a cemented carbide comprising a admixture, and a latex, water, fine aggregate, coarse aggregate made of an acrylic terpolymer, wherein the water is 100 parts by weight. When the cemented carbide cement 380 ~ 400 parts by weight, fine aggregate 900 ~ 1000 parts by weight, coarse aggregate 850 ~ 900 parts by weight, latex 90 ~ 92 parts by weight, more preferably in the unit material usage, water 94.7 per ㎥ Kg, cemented carbide cement 370kg, fine aggregate 873kg, coarse aggregate 840kg, latex 86.6kg.

First, the cemented carbide cement is composed of Portland cement (OPC), amorphous reducing slag, CSA and other admixtures. The amorphous reducing slag is a waste by-product generated during steel manufacturing, but has high hardness due to particle dispersion and cooling technology. It is used as a reactive cement additive, which means that eco-friendliness and economics such as reduction of carbon dioxide emission through waste resource recycling are improved.

The latex is an acrylic terpolymer, which has superior elongation and tensile strength of the film compared to the existing styrene / butadiene latex, and anionic functional groups on the surface of the polymer particles react with a strong (divalent, trivalent) cationic cement particle surface to react with cement. It has a reaction mechanism to increase the adhesion between and to form a stronger bond strength with the concrete base material.

First, the cemented carbide cement should be stable in physical properties by mixing with acrylic latex, weathering should not proceed, and satisfies the quality standards of the following [Table 1].

Table 1

Water must be clean and free of harmful substances that affect the quality of oils, salts, acids, alkalis, sugars, etc.

Fine aggregate is natural sand with particle size distribution according to KS F 2526 standard.

Coarse aggregates are clean and solid crushed stone or gravel, with a maximum aggregate dimension of 19 mm or less.

Since latex has a great change in quality depending on solid content, particle size distribution and manufacturing process, factory products with standardized manufacturing process should be used. Stabilizers and antifoams should be added at the factory. Latex should be milky, non-toxic and flammable, and satisfies the quality of Table 2 below.

Table 2

Furthermore, further retardants may be added, which must be dissolved in solution with water and dispersed in the formulation into a formulation tank that does not contain latex. In addition, the retardant should not exceed 1.0% at maximum, and incorporation of the retardant may change the working time depending on various conditions besides temperature.

Hereinafter, as shown in Figure 1, to explain the road pavement / repair / reinforcement method using the cemented carbide concrete composition.

First, the method comprises a cutting step of cutting the pavement surface to be repaired by the cutting equipment; and the surface treatment step of removing, cleaning the foreign matter of the cut pavement surface; and the preparation step of preparing concrete made of cemented carbide concrete composition And, a laying step of placing the concrete on the pavement surface using a laying equipment; and a curing step of curing and curing the poured concrete.

The cutting step is a step of cutting the pavement to be repaired, in order to secure the proper curing time and minimize the traffic blocking time, the cutting equipment is operated to cut the pavement pavement and damaged bottom plate concrete in a short time. The upper surface of the pavement and deck concrete is completely removed to the depth specified in the design book using cutting equipment (scrap crushers and water jets).

Thereafter, the step of processing the pavement surface soiled by the cutting step is carried out. First, the cutting waste generated by the road crusher and the water jet is integrated into a skid loader and placed in a dump truck to be treated at a designated waste disposal site, and the skid Cutting foreign substances and water that are not removed by the loader are sucked out using a vacuum suction truck.

Next, to produce a cemented carbide concrete composition for use in the present invention, based on 100 parts by weight of water, the cemented cement cement 380 ~ 400 parts by weight, fine aggregate 900 ~ 1000 parts by weight, coarse aggregate 850 ~ 900 parts by weight, latex 90 to 92 parts by weight, more preferably, the amount of unit material, consisting of 94.7 kg of water per cubic meter, 370 kg of cemented carbide cement, 873 kg of coarse aggregate, 840 kg of coarse aggregate, 86.6 kg of latex. Done.

The mixing method is as follows.

(1) In order for the materials to be added to the mixer, add them in the order of aggregate, latex, water, and cement. (The initial water is added only 80 ~ 90% of the amount used, and added by kneading machine.)

(2) The retardant used to prolong the setting time should be mixed with water and not used after mixing or directly added to latex.

(3) Mixing time should be more than enough time to secure the required air volume and slump. However, in the case of forced mixer, the mixing time should be at least 60 seconds.

(4) The components of JY-EPC-4 and kneading machine discharged from the mixer are to be equalized until the end of packing.

(5) The capacity of the mixer is to be able to finish the finishing work before the latex film is formed on the surface, and to finish the finishing equipment at a constant speed.

(6) Measured / calculated values are to be submitted in the following three ways for accurate calculation of production volume (installation volume: laying thickness). The supervisor decides the output by calculating the average value derived from ① and ②, but considers the value of ③ when the difference is more than 30%.

① Thickness of fracture surface and road surface during fracture

② Production calculation value by mobile mixer counter

③ amount of waste disposal

Furthermore, the laying step of placing the prepared concrete on the pavement surface using the laying equipment is carried out,

Prior to the installation phase, a brimming operation is first performed to enhance adhesion and eliminate interface defects.

The brimming operation is a task of rubbing by hand repeatedly so that the concrete can be applied to the vertical surface in the wet state.

The installation work will be carried out through the following process steps.

1. JY-EPC-4 should be poured as soon as possible to prevent the boiled side from drying out.

2. The laying thickness should be at least 4cm and finished with vibration compaction.

3. Rod compaction is to be carried out at areas of weak filling, such as corners, side walls, expansion joints, exposed bars, and areas of varying depths.

4. Sufficient preparation should be made to protect concrete that is not hardened against unexpected weather changes. If it rains during installation, the supervisor should stop all work and remove any damages.

Once the installation is complete, further tie-in work can be carried out to prevent slipping.

1. The transverse tie

1-1. Attach the hook to the tinning equipment and install it perpendicular to the center line of the road.

1-2. It should be installed at regular intervals of 20 ~ 30 mm, depth of 3 ㅁ 1.5 mm and width of 3 ㅁ 0.5 mm.

2. Longitudinal Tying

2-1. Attach the hook to the rear of the tinning equipment and install it parallel to the center line of the road.

2-2. It shall be constructed with a constant center distance of 19 mm to 1 mm, a depth of 3 mm 1.5 mm and a width of 3 mm 0.5 mm.

After the casting as described above is cured and cured, it can be further added to the film curing agent.

The film curing agent should use oily product. The amount should be determined considering the weather conditions, and the spraying amount should not exceed 1.5L / ㎡ (stock concentration 0.105kg / ㎡).

In general, the required strength during curing can be obtained from 3 to 4 hours at the application temperature. However, if the air temperature is 13 ℃ or higher, curing is to be performed for at least 4 hours after finishing the casting. However, if the air temperature is lower than 13 ℃, the curing period may be extended in consultation with the supervisor.

Figure 2 shows a modification of the installation equipment according to the present invention, the installation equipment is for placing concrete evenly on the pavement surface, the installation equipment is located on the pavement surface and the main pipe and the longitudinally movable And, the main pipe is provided with a plurality of branch pipes, coupled to the branch pipe is composed of a spray pipe for spraying the concrete supplied through the main pipe, it is configured to pour concrete from the top of the pavement more quickly and quickly In particular, the number of the injection pipes is variously selected according to the size of the pavement surface, and is made to be coupled, and the first blocking plate is arranged to overlap with each other so that the concrete comes out only when the injection pipe is coupled to the branch pipe A blocking member comprising a second blocking plate is further provided.

In general, in order to pour concrete, a main pipe communicating with a mobile mixer is provided, and a plurality of branch pipes are provided in the main pipe, and the injection pipes are coupled to the respective branch pipes, so that concrete is evenly distributed on the upper surface of the pavement. It is made to be able to spray.

At this time, the number of the injection pipe can be changed according to the size of the packaging surface, the present invention is to enable the injection pipe to be detachable to the branch pipe through the configuration of the blocking member 50, in this case When the injection pipe is not combined, the inside of the branch pipe is blocked to prevent the concrete from leaking out.

First, the branch pipe (B2) is configured in a shape protruding to one side of the main pipe (B1), the end of the injection pipe (A1) consists of three powders from the upper direction of the branch pipe (B2) down The upper and lower sides of the present specification are referred to based on the drawings shown in FIG. 2, and the scope of the rights should not be construed as limited thereto.

In more detail, as shown in FIG. 2A, each of the injection pipes A1 has a first powder A13 that forms an upper semicircle based on the cross-section, and both ends of the first powder A13. It consists of a second powder (A14) and a third powder (A15) coupled through the hinge portion (A16), the second powder (A14) and the third powder (A15) based on the cross section of the injection pipe (A1) To form a quarter each.

In addition, magnets A17 having different polarities are further provided at ends of the second powder A14 and the third powder A15.

Therefore, in this configuration, the second powder A14 and the third powder A15 are opened and joined at the upper part of the branch pipe B2, and the second powder A14 and the third powder A15 are closed to close the magnet. A17 may be attached to each other so that the injection pipe (A1) can be easily fixed to the branch pipe (B2).

In addition, the branch pipe (B2) is further provided with a blocking member 50 is designed to supply concrete to the injection pipe (A1) only when the injection pipe (A1) is coupled to the injection pipe (A1) is not coupled Branch pipe (B2) is characterized in that the concrete is not discharged.

In more detail, the blocking member 50 is composed of a first blocking plate 51, a second blocking plate 52, and an elastic member 54, with reference to FIG. Let's explain.

First, the first blocking plate 51 and the second blocking plate 52 are respectively provided in the branch pipe B2, and the first blocking plate 51 has a first discharge hole spaced at a predetermined interval ( 511 is provided, and the second blocking plate 52 is formed in the same manner as the first discharge hole 511, the second discharge hole 521 spaced by a predetermined interval is characterized in that it is formed.

Specifically, the first blocking plate 51 is fixed to the inside of the branch pipe (B2), the first blocking plate 51 one side, more precisely the second blocking plate in the direction of the injection pipe (A1) ( 52 is arranged to overlap, and the second blocking plate 52 is configured to be moved up and down in the branch pipe (B2).

In addition, a push portion 522 is further formed on an upper portion of the second blocking plate 52, and the push portion 522 is connected to the branch pipe B2 through an exposure hole 251 formed on the branch pipe B2. It is configured to protrude to the top, the lower portion of the second blocking plate 52 is provided with an elastic member 54 is made to impart an elastic force in the upper direction to the second blocking plate (52).

Therefore, when the injection pipes are not coupled, the circular centers of the second blocking plate 52 are positioned upward from the circular center of the first blocking plate 51 so as not to form concentric circles with each other.

When the push part 522 is pressed, the second blocking plate 52 is lowered so that the position of the first blocking plate 51 and the second blocking plate 52 is concentric.

Here, the situation in which the push unit 522 is pressed is when the injection pipe A1 is coupled to the branch pipe B2.

The present invention is characterized in that the concrete can communicate only when the injection pipe (A1) is coupled to the branch pipe (B2), which is the first discharge hole 511 and the second discharge hole 521 It can be determined by the formation position.

That is, the first discharge hole 511 and the second discharge hole 521 are in communication with each other only when the first blocking plate 51 and the second blocking plate 52 are in concentric circles with each other. This is because when the plate 52 is raised, the second discharge hole 521 is positioned at a spaced portion between the plurality of first discharge holes 511 to block communication of concrete.

Therefore, due to this structure, even if the plurality of branch pipes B2 are provided in the main pipe B1, unless the injection pipe A1 is coupled, the branch pipe B2 is naturally blocked without a separate blocking operation. Concrete does not leak to the outside, only the branch pipe (B2) coupled to the injection pipe (A1) is the first discharge hole 511 and the second discharge hole 521 is in communication with each other, the concrete main pipe (B1) ) May be supplied to the injection pipe (A1) to be injected through the first exhaust hole (A11).

In addition, the inner side of the branch pipe (B2), that is, the inner side of the first blocking plate 51 is further provided with a mesh plate 53, to prevent the foreign matter in the concrete to be primarily filtered, mixed and hardened It is preferable to make.

In addition, in the above description of the present invention with reference to the accompanying drawings, a description of the technology having a specific shape, structure, and configuration with a focus on the present invention various modifications, changes and substitutions by those skilled in the art, such modifications, changes and substitutions Should be construed as falling within the protection scope of the present invention.

A1: cutting step A2: surface treatment step
A3: preparation step A4: curing step

Claims (4)

Cutting step (A1) for cutting the pavement surface to be repaired by the cutting equipment;
A surface treatment step (A2) of removing and cleaning foreign matters from the cut pavement surface;
Preparation step (A3) of preparing a concrete consisting of a cemented carbide concrete composition through a mobile mixer equipment;
A laying step of placing the concrete on a pavement surface using a laying machine;
Curing step (A4) to cure by curing the poured concrete;
Including but not limited to,
The cemented carbide concrete composition is
Ultra-fast cement containing portland cement, reducing slag composed of amorphous calcium aluminate (C ₁₂ A ₇ ) mineral, calcium sulfoaluminate (CSA) and admixture,
A latex composed of an acrylic terpolymer,
Water, fine aggregate, coarse aggregate further includes, when 100 parts by weight of the water, cemented cement cement 380 ~ 400 parts by weight, fine aggregate 900 ~ 1000 parts by weight, coarse aggregate 850 ~ 900 parts by weight, latex 90 ~ 92 parts by weight Done,
The installation equipment
Main pipe (B1) connected to the mobile mixer equipment to supply concrete, a plurality of branch pipes (B2) provided in the main pipe (B1), the injection pipe coupled to the branch pipe (B2) for discharging concrete Including (A1),
The branching member B2 includes a blocking member 50 including a first blocking plate 51 and a second blocking plate 52 arranged to overlap each other so that concrete can be discharged only when the injection pipe A1 is coupled thereto. Is further provided,
The first blocking plate 51 is provided with a plurality of first discharge holes 511 at regular intervals, and the second blocking plate 52 is provided with a plurality of second discharge holes 521 at regular intervals.
The upper portion of the second blocking plate 52 is provided with a push portion 522 protruding to the upper portion of the branch pipe (B2). The plate 52 is lowered and arranged to be concentric with the first blocking plate 51,
Super fast concrete, characterized in that the first discharge hole 511 and the second discharge hole 521 is in communication with each other when the first blocking plate 51 and the second blocking plate 52 is in the concentric position Road repair reinforcement method using the composition. The method of claim 1,
Road repair reinforcement method using a super hard concrete composition, characterized in that the inner side of the first blocking plate 51 is further provided with a mesh plate (53).

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