KR101579290B1 - Concrete repair mortar, and method for constructing concrete structure using this same - Google Patents

Abstract

The present invention relates to a concrete repairing polymer mortar comprising granule slag silica and blast furnace slag, and to a method for repairing a concrete structure using the same. The concrete repairing mortar has a purpose of extending life of a concrete structure by improving penetration resistance against a sulfate and chloride by using a low alkali cement using a blast furnace slag and granule slag silica. The concrete repairing polymer mortar comprising granule slag silica and blast furnace slag comprises 30-40 wt% of cement, 14-18 wt% of blast furnace slat, 27-35 wt% of silica, 18-20 wt% of granule slag silica, 2-4 wt% of a re-dipersing resin, 0.5-1.0 wt% of zyrconyl nitrate, and 0.1-0.3 wt% of a fiber enhancer.

Description

TECHNICAL FIELD [0001] The present invention relates to a repair polymer mortar for concrete, which comprises granule slag silica and blast furnace slag, and a method for repairing and constructing a concrete structure using the same,

The present invention relates to a concrete repair mortar, and more particularly, to a concrete repair mortar which is made of granule slag silica and blast furnace slag, which improves resistance to penetration of sulfate and chloride by preventing damage to concrete, Polymer mortar and concrete structure repairing method using the same.

Generally, when a concrete building structure is aged over a certain period of time, the concrete gradually peels off and peels off due to aging.

Reinforced concrete made of general cement has strength due to the binding force of hydraulic component. When the reinforced concrete structure using ordinary cement and aggregate is exposed to chlorides by various routes, it induces the deformation of the reinforcing bars by the corrosion of the reinforcing bars, so that the strength of the reinforcing concrete itself is lowered, which seriously affects not only the appearance but also the structure. Most of the repair method is to remove the surface of the concrete and repair and reinforce it with the repair cement mortar.

A conventional patent document relating to a polymer cement mortar composition for repairing a concrete structure is as follows. Korean Patent Registration No. 10-0502279 discloses a method for producing a polymeric cement mortar composition for repairing a concrete structure, comprising the steps of: preparing a binder containing an inorganic binder (cement) and an organic binder (re- Discloses a method for manufacturing a powder coating agent for reinforcing steel reinforcing bars by mixing a nitrate and a nitrite, and a coating agent thereof.

Korean Patent Registration No. 10-0499343 discloses a waterproofing composition for concrete having a rust inhibitive function including a bipolar inorganic salt and tannin as an antioxidant, and Korean Patent No. 10-0515948 discloses a nitrite-based hydrotalcite Mortar composition containing hydrocarbons and a reinforcing concrete structure using the mortar composition.

However, when most of the conventional repair materials are exposed to chlorides, corrosion of the reinforcing bars proceeds again, resulting in repairing.

On the other hand, in order to obtain pig iron from iron ore in a blast furnace, the iron ore is put into a furnace together with fluxing agent such as limestone or dolomite and cokes. Coke burns out carbon monoxide and melts iron ore to make molten steel. During the separation of molten steel, the fluxing agent removes the impurities and becomes slag. Such slag is useful for the floor material of the road, raw material of cement and fertilizer.

The slag thus produced is a nonmetallic industrial by-product composed of silicates, alumino silicates calcium-alumina-silicates. The slag is cooled in the air, crushed by a crusher, filtered into grades, quenched with water or immediately used or pulverized. In most cases, water-quenched water-quenched slag is pulverized using a mill It is mixed with cement and used for replacing cement. Thus, slag cement mixed with ordinary cement and slag is already in production.

Korean Patent No. 10-0502279 Korean Patent No. 10-0499343 Korean Patent No. 10-0515948

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cement mortar composition which can be obtained by replacing cement with blast furnace slag and replacing low alkali cement and silica sand with granule slag silica to improve penetration resistance against sulfate and chloride, And a method for repairing and constructing a concrete structure using the same.

The concrete repair mortar according to the present invention comprises 30 to 34% by weight of cement, 14 to 18% by weight of blast furnace slag, 27 to 35% by weight of silica sand, 18 to 20% by weight of granular slag silica, % Of water, 2 to 4 wt% of a redispersible resin, 0.5 to 1.0 wt% of a water-soluble antirust agent, and 0.1 to 0.3 wt% of a fiber reinforcing material.

The method of repairing and repairing a concrete structure using a repairing polymer mortar for concrete comprising granular slag silica and blast furnace slag according to the present invention is characterized in that it comprises a repairing polymer mortar for concrete and a reinforcing bar preventive agent for concrete comprising blast furnace slag and blast furnace slag A method for repairing concrete using a concrete surface protection material and a thickness adjusting agent, comprising the following steps: a) a first step of measuring a repairing area and an area of a concrete structure; A second step of removing and cleaning a portion of the concrete structure after the first step that is required to be repaired by neutralization or the like; A third step of installing a thickness adjusting material around the reinforcing steel routed to the concrete structure after the second step; A fourth step of applying an organic / inorganic hybrid resin-based reinforcing rust preventive after the third step; A fifth step of applying the primer after the fourth step; A sixth step of applying the repairing polymer mortar for concrete after the fifth step; And a seventh step of applying a concrete surface protection material to the surface of the construction layer through the sixth step to construct the protection layer.

According to the present invention, the repairing polymer mortar for concrete and the concrete structure repairing method using the granular slag and blast furnace slag according to the present invention can prevent the infiltration of sulfate and chloride using low alkali cement and granule slag using blast furnace slag By improving the resistance, it is possible to extend the life of the concrete structure, and it is also possible to reduce the manufacturing cost due to the recycling of the blast furnace slag and the granular slag.

1 is a graph showing the particle size distribution of granular slag silica used in the present invention and silica sand used in conventional concrete repair mortar.
2 is a graph showing the particle size distribution of granular slag used in the present invention and silica sand and granular slag used in conventional concrete repair mortar.
FIG. 3 is a photograph of a specimen prepared for a characteristic test of a repairing polymer mortar for a concrete comprising granular slag silica and blast furnace slag according to the present invention.
FIG. 4 is a photograph showing the results of the resistance test of the repairing polymer mortar for concrete using the granular slag silica and the blast furnace slag according to the present invention, and the comparative example sulfate and chloride.

The concrete repair mortar according to the present invention comprises 30 to 34% by weight of cement, 14 to 18% by weight of blast furnace slag, 27 to 35% by weight of silica sand, 18 to 20% by weight of granular slag silica, , 2 to 4 wt% of a redispersible resin, 0.5 to 1.0 wt% of a water-soluble rust inhibitor (e.g., zirconyl nitrate), and 0.1 to 0.3 wt% of a fiber reinforcing material.

Cement is a conventional type 1 cement used for bonding of materials and bonding to concrete construction surfaces. When less than 30% by weight is mixed, bonding strength is weak. When it exceeds 34% by weight, workability is poor. The present invention can obtain a sufficient joining force even if a small amount of cement is used by replacing blast furnace slag with cement.

The blast furnace slag may be a finely divided powder produced from the iron ores when produced from iron ores and having a fineness ranging from 4,000 to 6,000 cm2 / g.

The blast furnace slag is a part of alkaline cement with a pH of 13. A method of replacing a part of the first kind cement with a blast furnace slag is already widely used in the concrete industry. The repairing polymer mortar for concrete made by replacing part of the first type cement with blast furnace slag increases the resistance to sulfate and decreases the alkali silica reaction (ASR: Alkali - silica reaction) and penetration of chloride To increase the physical stability of the repaired concrete structure to extend the life of the concrete structure, especially the coastal or underground concrete structure, and the underground structure which is in direct contact with the soil such as tunnels and culvert, It is very effective in repairing and restoring damaged concrete and suppressing secondary infiltration due to penetration of concrete structure in direct contact with seawater containing sulfate such as magnesium sulfate (MgSO ₄ ) and desalted salt sprayed in winter season .

When the blast furnace slag is mixed with less than 14% by weight, the economic effect is small due to a low substitution rate, and when the blast furnace slag is mixed in an amount exceeding 18% by weight, the hydration reaction is delayed and there is a problem in early strength.

Synthetic silica is used for the development of strength of the repair layer according to the present invention and usually used for repair mortar. Natural silica is preferably used, but synthetic silica can be used if there is a problem in supplying. By replacing the silica with silica, an appropriate amount of 27 to 35 wt% is caused, while a content of less than 27 wt% causes a decrease in strength, and even if the silica is mixed in an amount exceeding 35 wt%, there is no great difference in strength due to granular slag silica.

In the present invention, granular slag silica is used as silica sand.

In order to make maintenance mortar, silica sand has been used a lot but the use of artificial silica sand has been reduced by the use of screen - graded silica sand as the resources are depleted in recent years. However, the quartz sandstone using this quartzite is decreasing in quartzite mines, and recently dolomite is crushed and sieved and graded. The dolomite is a carbonate mineral with almost no SiO2 component compared to silica sand, and consists of carbonate lime and magnesium carbonate.

It is known that in the concrete using dolomite aggregate, the reaction between dolomite aggregate and cement paste causes dedolomitization, which causes rim on concrete. That is, the deterioration of the concrete using limestone or dolomite aggregate was caused by the alkali-carbonate reaction between the cement paste and the carbonate aggregate of the strong alkali. That is, dolomite is decomposed into brucite, calcite and carbonate ion by strong alkali extracted from cement of high pH.

CaMg (CO ₃ ) ₂ [Dolomite] + 2OH [base]

-> CaCO ₃ [Cacite] + Mg (OH) ₂ [brucite] + CO ₃ ^2- [carbonate]

These reactions are accompanied by volume changes and cause micro-cracks between the concrete and aggregate. These cracks are another cause of the deterioration of the concrete because they act as a passage through which the melt of the desalination salt penetrates. This reaction is known to be further promoted by various desiccants, calcium chloride (CaCl ₂ ), sodium chloride (NaCl ₂ ), magnesium chloride (MgCl ₂ ) and the like.

Since artificial silica has many problems, it is difficult to use the artificial silica in practical use. In order to solve this problem, the present invention uses granular silica slag.

The granule slag refers to a product derived from the blast furnace process, and the granule slag is a mixture of granule slag and silica sand.

The granule slag is stable in vitrification because the molten slag generated in the blast furnace process is quenched (high-pressure spraying) by water and is not crystallized. It is stable because the structure is hard and the reactivity is very low. However, since the particle size distribution is very irregular, In the present invention, silica sand is mixed so that the granular slag silica can be used as the fine aggregate.

The chemical compositions of the granular slag and the general silica processed by the present invention are shown in Table 1 below.

Chemical composition Content (% by weight) Granule slag silica Silica sand Backcountry SiO2 35.1 90 Al2O3 14.3 4.5 MgO 5.85 0.28 21.7 CaO 41.0 0.22 30.4 Fe2O3 0.41 0.5 Other 3.34 4.5 47.0

Conventionally, such granule slag was pulverized into a mill and mixed with cement. In the cement thus produced, the free Ca (OH) ₂ content in the cement is relatively small as compared with the general cement. Generally, the free Ca (OH) ₂ in the cement reacts with the sulfate contained in the seawater or groundwater to produce calcium sulphate, which reacts with calcium aluminate, one of the cement components, to cause the concrete crack, which is an expanded crystal, Calcium sulpho aluminate .

However, when the slag is replaced with a part of general cement, resistance to sulfate is relatively increased as compared with general cement, and such cement is widely used in coastal construction. The pozzolanic reaction is delayed, and the initial strength is lower than that of the cement, but may be better for later strength.

That is, the present invention is characterized in that granular slag silica is used so that excellent strength can be exhibited without causing cracks in concrete without using the granular slag derived from the blast furnace process as it is.

The particle size distribution of the granular slag silica according to the present invention and the silica sand used in the conventional concrete repair mortar is the same as in FIG. Existing concrete repair mortar is based on existing products that meet KS F4044 quality standards (in Fig. 1, S.Sand is granule slag and Sun-PM is general sand).

The particle size distribution of the granular slag (S. Sand) is more concentrated on the assembly side than the particle size distribution of the existing product (Sun-PM) and does not follow the normal distribution.

Therefore, it is necessary to mix the fine silica sand to the distribution of Sun-PM.

The particle size of the accumulated particle size distribution d = 50 (50% of the cumulative fraction) was about 0.7 mm, whereas the granule slag was about 1 mm, about 0.3 mm thick. That is, it is judged that the particle size distribution of the granule slag is considerably larger than the particle size distribution of the silica sand used in the conventional product, and when the assembly is large, the surface of the product becomes rough after the application and the workability is deteriorated. do.

Therefore, in the present invention, the grain size distribution of the silica sand was replaced with granules # 5 and # 6 in granular slag to reduce the difference in particle size distribution as shown in Table 2 and FIG. 2, (Example 1) and control # 2 (Example 2). It is mixed with 20 ~ 30 mesh (0.85 ~ 0.6mm) for silica sand, and 30 ~ 60mesh (0.6 ~ 0.25mm) for silica sand.

The granular slag silica is a mixture of 25 to 35 parts by weight of at least one of silica sand 5 and silica sand 6 with respect to 100 parts by weight of granular slag. When silica sand 5 and silica 6 are mixed, they are properly mixed in the above-mentioned range.

Particle size
(mm) Existing product Granule slag Example 1 Example 2 2 0 7.6 3.1 2.5 1.18 3.7 26.1 9.0 7.9 0.85 26.5 23.3 18.7 19.3 0.6 33.3 18.6 28.5 34.4 0.425 23.6 12.8 27.4 24.1 0.212 12.4 8.3 12.0 11.0 0.15 0.5 3.3 1.3 0.8

Existing products are silica sand.

When the re-dispersion resin is mixed in an amount of less than 2% by weight, the re-dispersing ability is weak. When the re-dispersing resin is used in an amount exceeding 4% by weight, excessive redispersibility causes a problem of strength reduction. For example, FL1210 (white powder, ELOTEX manufactured by the manufacturer) is used.

As the water-soluble rust inhibitor, it is possible to use, for example, a product name nitric acid zirconyl (manufactured by Yasuo Kasei Co., Ltd.) as a zirconyl nitrate system. When less than 0.5% by weight is mixed, the rust preventive effect is weak and even if it exceeds 1.0% .

Zirconyl nitrate is a stimulant for the stimulating activity of slag. If it is out of the range of 0.5 to 1.0 wt%, activation of stimulation of slag is weak, there is not much change in stimulus, and it can be replaced with all materials having equivalent functions.

The fiber reinforcing material is used for improving the tensile strength of the repair layer and is 4 to 8 mm in length. If less than 0.1% by weight is mixed, the tensile strength can not be improved. If it exceeds 0.3% by weight, The workability and strength are lowered, and polypropylene fiber reinforcing materials and the like can be used.

<Examples>

1. Composition.

The mortar of the present example is composed of 30 wt% of cement, 16 wt% of blast furnace slag, 32 wt% of silica sand, 19 wt% of granule slag, 2 wt% of redispersing resin, 0.8 wt% of zirconyl nitrate as water- 0.2% by weight of a polypropylene fiber reinforcing material (6 mm) as a reinforcing material, and used together with water (mixed with 15 to 20 parts by weight of 100 parts by weight of repair mortar).

2. Psalms.

In order to test the characteristics of this embodiment, a specimen having the shape shown in FIG. 3 was prepared. The specimen is cured by placing mortar on the outside of the reinforcing bar so that the reinforcing bars are embedded inside. For comparison of the present embodiment, a comparative example having the same structure as that of this embodiment was manufactured by using general cement and reinforcing bars.

3. Characteristic test.

end. Resistance to sulphate and chloride.

A wire net was laid in the vessel, and the specimens were placed. Then, the seawater coexisting with chloride and sulfate was poured to the top of the specimen. The converter was used to convert 220 volts of AC into 24 volts DC, attaching the "+" pole to the reinforcing bar at the center of the specimen, and connecting the "-" pole with the wire mesh inside the vessel. When the electricity is connected, the chloride Cl- and hydroxyl groups dissolved in seawater move toward the reinforcing bars of the "+" pole and the active reaction proceeds.

Test results As shown in Fig. 4 (the left side is a comparative example and the right side is a present example), the present example showed better resistance than the comparative example.

I. burglar. (N / mm2) (see Table 3)

KS 4042 Existing product  Example 2 Compressive strength (28 days) 20 or more 48.2 47.6 Flexural strength (28 days) 6.0 or higher 8.2 8.1

Compared to existing products, they exhibited slightly lower physical properties, but they satisfied the quality standards of polymer cement mortar for repairing KS F 4042 concrete structures.

The method of repairing and constructing a concrete structure using the repair polymer mortar for concrete comprising the granular slag silica and the blast furnace slag according to the present invention is as follows.

First, in the repairing method according to the present invention, the materials of the repairing polymer mortar for concrete, the composite resin-based reinforcing bar preventing agent for concrete, the concrete surface protecting material, and the thickness adjusting agent, which are composed of granular slag silica and blast furnace slag, are used. do.

The repairing polymer mortar for concrete, which comprises granule slag silica and blast furnace slag, has been described above and is therefore omitted.

The organic / inorganic composite resin-based reinforcing rustproofing agent is a mixture of an organic-inorganic hybrid resin, an antirust agent, a filler, a pigment, and a curing agent.

The organic / inorganic hybrid resin reinforcing rustproofing agent contains 53.0 ~ 58.0% by weight of an organic / inorganic hybrid resin (manufactured by Korea Foil Technology Co., Ltd., product name: ceragomer), 34.0 ~ 38.0% by weight of barium sulfate as a filler, 2.0-4.0% by weight of titanium dioxide as a modifier, 1.0 to 4.0% by weight of a pigment and 2.0 to 4.0% by weight of a zinc cobalt salt as a rust preventive agent (Halox CZ-170 manufactured by Halox Co., Ltd.) as a rust inhibitor, 10 to 20% by weight.

The organic-inorganic hybrid resin is a material obtained by copolymerizing, for example, an epoxy resin, an organic resin, and silica, which is a inorganic resin, in a weight ratio of 1: 1 (this weight can be changed in various ways) . In other words, the epoxy resin, which is an organic resin, is weak against alkali resistance, adhesive strength, but UV resistance and organic acid, whereas silicone resin which is a inorganic resin is weak against UV resistance, strong in organic acid and alkali resistance, When the content of less than 53% by weight is mixed, the effect such as alkali resistance is weak. When the content exceeds 58% by weight, the mixing ratio of other materials is lowered, and the rust prevention effect is lowered .

Zinc orthophosphate is preferably used as an antirust agent. When less than 2% by weight is mixed, the antirust effect is weak, and even if the antioxidant is mixed in an amount exceeding 4% by weight, the antirust effect is not significantly different.

As the filler, barium sulfate [minimum BaSO4 content 97.5%, medium particle size (d = 50): 2.5 microns and various particle sizes based on this is possible] is used, less than 34.0 wt% , The anti-rust effect is weak.

Titanium dioxide is a modifier having a minimum TiO2 content of 93%, a specific gravity of 4.0 and a median particle size (d = 50) of less than 2.0% by weight (0.405 micron) Excessive coloring can cause problems.

The curing agent may be, for example, 12 to 13% by weight of Jempamine D230, 87 to 88% by weight of dioctyltin iodoctanoate, If less than 10% by weight is mixed, the curing is delayed, and if it exceeds 20% by weight, the workability is poor.

The reinforced rustproofing agent made of this resin is a resin which is an organic resin in the organic / inorganic composite resin has a very strong adhesion to the reinforcing steel and the silicon component as the inorganic resin reacts with the cement of the concrete to exhibit excellent adhesion, It is possible to expect adhesion strength to mortar superior to that of conventional rust inhibitor.

The organic / inorganic composite resin-based reinforcing rust preventives having such a composition are easier to work with compared to conventional zinc-epoxy primers, thereby reducing the construction cost.

Concrete surface protection materials are characterized by using organic / inorganic composite resin. 53.0 to 58.0% by weight of an organic / inorganic hybrid resin (trade name: ceragomer supplied by Korea PolyTech Co., Ltd.) copolymerized with an epoxy resin, which is an organic resin, and silica, which is a inorganic resin, at a weight ratio of 1: 1, an anti-sagging agent 3.0 to 5.0% by weight of a synthetic polyamide wax (monoral SD, product name of HS Chem), 0.7 to 1.3% by weight of an organopolysiloxane-based polysiloxane as an antifoaming agent, an organoclay rhelogical additive 3 to 5% by weight of Frugel 200 from FCC Inc, 28.0 to 32.0% by weight of barium sulfate, 3.0 to 4.0% by weight of titanium dioxide (DuPont Ti-Pure R900) and 1.0 to 3.0% by weight of a coloring pigment (BASF Tinubin) Is mixed with 1.0 to 2.0% by weight.

The curing agent is composed of 12 to 13% by weight of Zephamine D230 and 87 to 88% by weight of dioctyltinone canoate.

The concrete surface protective agent is composed of a mixture of 80 to 90% by weight of the subject and 10 to 20% by weight of a curing agent.

When used for repairing deteriorated concrete using such a construction method and materials, resistance to sulphate or chloride is improved and the life of concrete is extended.

These concrete surface protection materials are easy to apply, very strong adhesion to concrete or mortar, stable to UV, long-lasting color, and surface-enriching.

Thickness adjuster is used for smooth thickness adjustment when installing repair mortar. It is made of zinc, and has a mesh type material (blade length 30 ~ 55mm, bead height 9 ~ 11mm) with constant thickness and width. Zinc beads are intended to make the thickness control very effective when constructing maintenance mortar. However, due to the nature of zinc, galvanic sacrificial anodes are first connected to the rebar in the reinforced concrete before the rebar is corroded. Which is effective in preventing corrosion of reinforcing bars.

More specifically, the zinc bead is formed of a metal such as iron (Fe (OH) ₂ ) which is converted into iron oxide when the OH- reacted in the moisture, which is the corrosive condition of the mortar or concrete, First, it causes corrosion, which has the effect of inhibiting corrosion of steel bars.

The method of installing the thickness adjusting material is to chipping the concrete to the reinforcing bar of the concrete which has been corroded by the progress of the deterioration, selecting the thickness adjusting material of the desired thickness (height), and attaching the end of the thickness adjusting material to the reinforcing bar do.

1. Repair repair site measurement.

A hole is drilled in the concrete structure and a potentiometer is inserted in the hole to measure the potential difference between the reinforcing steel and the concrete section to confirm corrosion and repair of the reinforcing steel.

2. Remove the repair area.

As an acid indicator, phenolphthalein, for example, is applied to identify the neutralized part, and the deteriorated concrete is removed using a device such as a breaker.

3. Inspect and replace rebar.

After removing the concrete, check the corrosion of the reinforcing bars. If the reinforcing bars are highly corrosive and need to be replaced, remove the corroded parts and connect new reinforcing bars by welding.

4. Cleaning.

Removes contaminants to prevent peeling of the protective layer.

5. Re-adjust the thickness.

The thickness adjustment material (zinc bead) is installed in the repair part, and the end of the thickness control material is connected to the reinforcing bar to prevent oxidation of the reinforcing bar.

6. Reinforced anti-corrosion agent is applied.

The above-mentioned reinforcing bar preventive agent is applied to the reinforcing bars.

7. Primer application.

A primer (styrene-butadiene latex) is applied (primer layer thickness: 200 to 300 microns) for adhesion of the repair layer by the repair mortar.

8. Installation of repair polymer mortar for concrete.

The repairing polymer mortar for concrete according to the present invention is placed.

9. Application of concrete surface protection material.

Apply the concrete surface protection material (thickness of protective layer: 300 ~ 400 microns) after installing the repair polymer mortar for concrete.

Claims (6)

14 to 18 weight% of blast furnace slag having a particle size of 4,000 to 6,000 cm2 / g, 27 to 35 weight% of silica sand, 18 to 20 weight% of granular slag silica as a mixture of granule slag and silica sand, 30 to 34 weight% of cement, To 4% by weight of zirconyl nitrate, 0.5 to 1.0% by weight of zirconyl nitrate and 0.1 to 0.3% by weight of a fiber reinforcement of 4 to 8 mm length,
Wherein the granule slag silica is mixed with 25 to 35 parts by weight of at least one of silica sand 5 and silica sand 6 with respect to 100 parts by weight of granule slag, and a blast furnace slag. delete A method of repairing and repairing concrete using a repair polymer mortar for concrete, a composite resin-type reinforcing steel anti-rust agent, a concrete surface protecting material and a thickness adjusting agent, comprising granule slag silica and blast furnace slag,
A first step of measuring the repairing area and area of the concrete structure;
A second step of removing and cleaning a portion of the concrete structure after the first step that is required to be repaired by neutralization or the like;
A third step of installing a thickness adjusting material around the reinforcing steel routed to the concrete structure after the second step;
A fourth step of applying an organic / inorganic hybrid resin-based reinforcing rust preventive after the third step;
A fifth step of applying the primer after the fourth step;
A sixth step of applying the repairing polymer mortar for concrete according to claim 1 after the fifth step;
And a seventh step of applying a concrete surface protection material to the surface of the construction layer through the sixth step to construct a protective layer,
The fourth step is a step in which the organic-inorganic hybrid resin is composed of 53.0 to 58.0% by weight of barium sulfate, 34.0 to 38.0% by weight of barium sulfate, 2.0 to 4.0% by weight of titanium dioxide, 1.0 to 4.0% by weight of a coloring pigment, Based composite iron-based rustproofing agent consisting of 80 to 90% by weight of a base material and 4.0 to 10% by weight of a curing agent,
In the seventh step, the organic-inorganic hybrid resin is used in an amount of 53.0 to 58.0% by weight, a synthetic polyamide wax as an anti-sagging agent in an amount of 3.0 to 5.0% by weight, an organic polysiloxane- , 0.7 to 1.3% by weight of an antioxidant, 3 to 5% by weight of a sedimentation inhibitor, 28.0 to 32.0% by weight of barium sulfate, 3.0 to 4.0% by weight of titanium dioxide, 1.0 to 3.0% by weight of a color pigment and 1.0 to 2.0% Wherein the concrete surface protection material is a mixture of 80 to 90% by weight of a subject and 10 to 20% by weight of a curing agent, and the surface protection material is applied to the surface of the treated concrete mortar repairing layer through a previous step. Construction method. [6] The method of claim 3, wherein the third step is to install the zinc bead as a thickness adjusting material, and connecting the end of the thickness adjusting material to the reinforcing bar, Repair and Construction Method of Concrete Structures Using Mortar. delete delete

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