KR102063011B1 - Mortar for reparing cross section of concrete structure and construction method for reparing cross section of concrete structure using the same - Google Patents

Abstract

Provided is a mortar for repairing a cross section of a concrete structure, which comprises: 20 to 30 wt% of Portland cement; 40 to 50 wt% of aggregate; 5 to 10 wt% of steel slag; 5 to 10 wt% of an elastic composite resin; 3 to 5 wt% of dimethylaminoethyl methacrylate; 3 to 5 wt% of calcium sulfoaluminate; 1 to 3 wt% of silica fume; 1 to 3 wt% of coconut fiber; 1 to 3 wt% of hydroxy copper carbonate; 1 to 3 wt% of pearlite; 0.1 to 1.5 wt% of attapulgite; 0.5 to 1.5 wt% of nylon fiber; 0.5 to 1.5 wt% of polyparaphenylene alkylenedicarboxylate; 0.5 to 1.5 wt% of amide wax; and 0.05 to 0.5 wt% of sodium citrate. According to the present invention, the strength and adhesive persistence of a repairing mortar are excellent, cracks of constructed mortar are suppressed, and separation of a cross-section is prevented. Also, the degradation of strength and durability caused by the neutralization of concrete is prevented, and the corrosion of a steel bar is suppressed. In addition, the durability of a structure is increased and the structural stability of a concrete structure is realized, thereby increasing a service lifespan.

Description

MORTAR FOR REPARING CROSS SECTION OF CONCRETE STRUCTURE AND CONSTRUCTION METHOD FOR REPARING CROSS SECTION OF CONCRETE STRUCTURE USING THE SAME}

The present invention relates to a mortar for repairing a section of a concrete structure and a method for repairing a section, and more particularly, to provide a repair mortar that exhibits strength, adhesion sustainability, crack and corrosion inhibition, and structural stability. The present invention relates to a method for repairing and reinforcing damaged sections of a structure.

In general, concrete has been widely used as a construction material because of its excellent formability, fire resistance, and economic efficiency.In particular, reinforced concrete structures in which compression is borne by concrete and tensile is borne by reinforcement are reinforced by high coefficient of thermal expansion similar to that of reinforcing steel and concrete. This is used a lot.

Such reinforced concrete structures include general cement and aggregates, which are developed by bonding strength of hydroponic components, and are degraded by exposure to various environmental factors such as physical and chemical properties, resulting in deterioration of performance. The strength and aesthetics of the structure are lowered due to the corrosion of reinforcing steel bars by chloride or the like, and thus it is impossible to perform its role until the target durability of the reinforced concrete structure.

In other words, concrete structures reinforced with reinforcing bars react with calcium ions (Ca ²⁺ ) in the concrete pores when chloride ions (Cl ⁻ ) penetrate from the outside to form soluble calcium chloride (CaCl ₂ ) and then elute. As a result, chloride ions are more easily penetrated into the concrete, and the penetrated chloride ions locally destroy the passivation protective film formed on the surface of the reinforcement by the strong alkalinity of the concrete.

The part where the passivation protective film is destroyed electrochemically lowers the potential of reinforcing bars, thus forming an anode, and the part maintaining the passivation becomes a cathode. In the anode part, chloride ions and iron (Fe) react as shown in Reaction 1 below. and the generation of ferrous chloride (FeCl ₂₎ of the soluble, in the negative electrode portion e (2e ^-) separated from the iron and the oxygen coming from the outside (O ₂₎ and water molecules (H ₂ O) to react with hydroxyl ion (OH ^- )

Scheme 1

_{^{Fe + 2Cl - → FeCl 2 +}} 2e -

In addition, the ferrous chloride produced at the anode portion reacts with moisture on the surface of the rebar again to produce ferrous hydroxide (Fe (OH) ₂ ), and chloride ions remain intact again to react with another iron, as shown in Scheme 2 below. The cycle you create is repeated. At this time, hydrogen ions (2H ⁺ ) generated by the production of ferrous hydroxide lower the pH of the anode portion to further destroy the passivation film formed on the surface of the rebar.

Scheme 2

_{FeCl 2 + 2H 2 O → Fe} (OH) 2 + 2H + + 2Cl -

In addition, ferrous hydroxide reacts with oxygen to produce iron oxide (Fe ₂ O ₃₎ as shown in Reaction Formula 3 below, wherein a cross section of the concrete is dropped or a crack is generated by a pressure at which the rebar is expanded by about 2.3 times.

Scheme 3

2Fe (OH) ₂ + 1/2 O ₂ → Fe ₂ O ₃ + 2H ₂ O (green layer formation)

In addition, since the surface of the reinforcing steel present in the concrete is strongly alkaline having a pH of 12 to 13, an impermeable passivation film is formed and protected from corrosion. Calcium carbonate (CaCO ₃ ) is formed, and calcium sulfate (CaSO ₄ ) is produced by sulfurous acid gas, and the pH of concrete is lowered to less than 10. Thus, the impermeable passivation film on the surface of the reinforcement existing in the strong alkali environment is destroyed, resulting in iron and chloride ions. This reaction causes the corrosion of the rebar to be promoted.

Scheme 4

Ca (OH) ₂ + CO ₂ → CaCO ₃ + H ₂ O

As a method for repairing the cross section of the damaged concrete structure, a method of reinforcing the structure by removing the surface of the concrete, removing the rust of the reinforcing bar, increasing the adhesive force using a primer, and repairing the repair mortar by repairing it.

In the related art related to this, Patent Document 1 has a first step in which the main composition is composed of 75 to 78.6% by weight of water-soluble epoxy resin, 20 to 23.6% by weight of water-soluble soft acrylic resin, 1.1 to 2% by weight of antibacterial agent, and 0.3 to 0.5% by weight of antifoaming agent. In a second step of forming the curing agent into 50 to 60% by weight of a water-soluble hardener, 30 to 40% by weight of water, and 5 to 15% by weight of silicate, the filler is added as an additional admixture of the main material and the curing agent. Pigment 2 to 5% by weight, copper powder 0.2 to 0.5% by weight, silica gel 2 to 5% by weight, antioxidant 3 to 3%, antioxidant 0.2 to 0.3% by weight of the third step, the composition and 20kg each of the curing agent Add 40 kg of water, add 40 kg of water, dilute and mix for 5 minutes to form a permeable water-based modified epoxy primer, and add water at a ratio of 1: 2 to the weight of the mixture of the main body and the curing agent. The fifth step of forming an aqueous acrylic modified epoxy resin mortar by mixing the mortar in a ratio of 1: 9.5 to the input amount, and the acrylic softener completed by mixing the main, hardener, water, and filler in a ratio of 1: 1.3 by weight, respectively. A method for preparing a cross-sectional repair, neutralization and salt prevention treatment of a concrete structure using a mortar containing a water-soluble epoxy having a protective coating formed of a resin is disclosed.

However, the above-described prior art may cause cracks in concrete structures, chloride penetrates into the cracks, and corrosion of reinforcing steel proceeds. -off) or exfoliation occurs, there is a problem that must be repaired soon after construction.

Republic of Korea Patent Publication No. 10-0797597 (published Jan. 23, 2008)

The present invention has been made in order to solve all the above problems, the strength of the repair mortar and adhesion persistence, the crack of the construction mortar is suppressed, the fall-off of the cross section is prevented, the strength and durability decrease due to the neutralization of concrete To prevent the corrosion of reinforcing bars, to suppress the corrosion of reinforcing steel, to increase the durability of the structure, and to provide structural stability of the concrete structure, thereby increasing the service life. The purpose is.

In order to solve the above problems, the present invention, in weight%, Portland cement 20-30%, aggregate 40-50%, steel slag 5-10%, elastic composite resin 5-10%, dimethylaminoethyl methacrylate 3 To 5%, calcium sulfoaluminate 3 to 5%, silica fume 1 to 3%, coconut fiber 1 to 3%, hydroxy copper carbonate 1 to 3%, pearlite 1 to 3%, attapulgite 0.1 to 1.5%, nylon It provides a mortar for cross-sectional repair of a concrete structure comprising 0.5 to 1.5% fiber, 0.5 to 1.5% polyparaphenylene alkylenedicarboxylate, 0.5 to 1.5% amide wax, and 0.05 to 0.5% sodium citrate.

In addition, the present invention comprises the steps of identifying and selecting a damaged cross-sectional area of the concrete structure in need of repair; A chipping step of chipping, washing, and drying the selected cross-sectional area to be repaired to clean the surface; Applying a primer to the chipped cross-sectional area; A casting step of mixing the mortar for repairing the cross section of the concrete structure with water on a section where the primer is applied; Curing step of curing the mortar; And it provides a cross-sectional repair method of the concrete structure comprising the step of applying a surface protective material on the surface of the cured mortar.

According to the present invention, the strength and adhesion sustainability of the repair mortar is excellent, the crack of the construction mortar is suppressed, the cross-sectional fall prevention is prevented, the decline in strength and durability due to the neutralization of concrete, the corrosion of the steel is suppressed The durability of the structure is increased, and the structural stability of the concrete structure is exerted, thereby increasing the service life.

1A is a cross-sectional view of a concrete structure in which deterioration does not proceed to rebar depths according to an embodiment of the present invention.
1B is a cross-sectional view of a concrete structure in which deterioration proceeds to rebar depth according to an embodiment of the present invention.
2A is a cross-sectional view of a concrete structure in which deterioration does not proceed to rebar depths according to another embodiment of the present invention.
2B is a cross-sectional view of a concrete structure in which deterioration proceeds to rebar depth according to another embodiment of the present invention.
3a and 3b is a flowchart of the cross-sectional repair method of the concrete structure according to an embodiment of the present invention.

In general, concrete is dried over time after pouring, and there is almost no moisture in the interior.In order to repair the concrete, the adhesion of the surface to be deposited is required and the adhesion must be maintained. If the repair mortar (new concrete) is used directly on the surface of the old concrete, there will be a rapid movement of moisture in the dried surface, and the repair mortar will adhere according to the difference in moisture between the surface and the repair mortar. It can be lifted or peeled off and acts as a cause of cracking, which facilitates the penetration of moisture, carbon dioxide, and chloride, which leads to rapid deterioration of reinforced concrete, which seriously affects the concrete structure.

In order to increase the adhesive strength on the interface of the old and new concrete, the primer is applied to the cross-sectional area of the concrete structure that needs to be repaired using a brush or a roller. The conventional primer has a low specific surface area and thus has low adhesive strength, Once formed, no repair mortar is attached, so close attention is required.

Hereinafter, with reference to the drawings will be described first with respect to the cross-sectional repair mortar of the concrete structure according to the present invention, and then to the cross-sectional repair method of the concrete structure using the same will be described in detail with reference to the embodiment.

Sectional repair mortar of the concrete structure according to the present invention exhibits strength, adhesion sustainability, crack and corrosion inhibition and structural stability, in weight percent, Portland cement 20-30%, aggregate 40-50%, steelmaking slag 5 To 10%, elastomeric resin 5 to 10%, dimethylaminoethyl methacrylate 3 to 5%, calcium sulfoaluminate 3 to 5%, silica fume 1 to 3%, coconut fiber 1 to 3%, copper hydroxycarbonate 1-3%, pearlite 1-3%, attapulgite 0.1-1.5%, nylon fiber 0.5-1.5%, polyparaphenylene alkylenedicarboxylate 0.5-1.5%, amide wax 0.5-1.5%, and citric acid Sodium 0.05-0.5%.

The portland cement is mainly pulverized by mixing a calcite raw material and a clay raw material in an appropriate ratio, which is included in the present invention in 20 to 30% by weight, and becomes a basic binder, and includes lime, silica, alumina, iron oxide, and the like. It is kneaded, condensed and cured to develop long-term strength. Water is used 30 to 50 parts by weight based on 100 parts by weight of Portland cement.

The aggregate includes 40 to 50% by weight, the size of the aggregate is used as the aggregate size of 2 to 3mm, can be used, such as steel sand, silica sand, crushed sand, recycled fine aggregate.

The steelmaking slag contains 5 to 10% by weight, which is a slag generated in the steelmaking process, is generated in the process of refining pig iron in a converter to remove impurities such as carbon, phosphorus and sulfur, reinforcing strength, and calcium oxide. It contains useful components such as magnesium oxide and aluminum oxide to impart alkali, prevent oxidation by forming an aluminum oxide film, and use a particle size of 0.5 to 2 mm in the present invention.

The elastic composite resin is a composite resin having elasticity mixed with various materials, 5 to 10% by weight is included in the mortar to improve the adhesion performance by the viscosity of the mortar, stretch resistance to external stress and deformation, such elastic This prevents cracking and prevents the oxidation, corrosion and aging of the mortar. Detailed configuration of the elastic composite resin for this will be described later.

The dimethylaminoethyl methacrylate acts as a binder with excellent adhesion to stabilize the mortar in the cross-sectional area to stabilize, increase the strength and durability, it is preferable to contain 3 to 5% by weight, 5% by weight If it exceeds the viscosity may increase the adhesive strength.

3 to 5% by weight of the calcium sulfoaluminate is added to increase the number of chemical bonds due to the hydration reaction, and crystals called ettringite are formed to expand and expand and expand the colloidal phase into the pores of the gel in the process of curing the cement paste. As the voids are reduced by hardening, the shrinkage of the concrete is reduced, cracks are suppressed, and the reinforcing bars in the concrete are tensioned by the expansion pressure, and the compressive stress is introduced into the concrete, thereby increasing the tensile strength of the concrete structure.

The silica fume is a by-product of ultra-fine silicon produced in the production of silicon, in the present invention, 1 to 3% by weight is added to fill the fine pores of the mortar to densify the mortar, enhance the strength, and have penetration resistance to chloride ions.

The coconut fiber is a fiber extracted by crushing the coconut shell, and acts as a reinforcing fiber, dispersed in the mortar to promote the bending strength and tensile strength of the mortar by high strength, and excellent light resistance because it does not change easily even when exposed to light , Evenly dispersed in the mortar to increase the light resistance and corrosion resistance, for this purpose is included 1 to 3% by weight. At this time, the coconut fiber is preferably 20 to 50 mm in length, 1 to 3 mm in diameter.

The hydroxy copper carbonate is a basic salt, has a monoclinic crystal structure, consists of needle-like fine crystals can fill the fine pores not filled by the expansion of the capsule sulfoaluminate, in the present invention 1 to 3 The weight percent is included to fill the micro voids in the concrete to form a stable and dense structure in the long term to improve the water-tightness of the concrete, suppress cracks, and contribute to the stable strength enhancement.

The perlite is a fine particle obtained by pulverizing and swelling pearl rock, and composed of a porous body having many fine pores and a large surface area, having a particle size of 0.01 to 0.02 mm, and having a low volume density, containing 1 to 3% by weight. It increases hardness, cohesiveness, acts as an alkali, suppresses the loss of mortar alkalinity, delays neutralization, adsorbs gas such as carbon dioxide or ammonia in the fine pores, ventilates and removes odor, and purifies air. Has the function.

The attapulgite is a microcrystalline and has a tunnel structure according to the silicic tetrahedron chain structure, and is a light and porous microfine clay mineral, in the present invention by containing 0.1 to 1.5% by weight, made of ultrafine particles and binding force It is excellent and contributes to the formation of dense structure of mortar. It has excellent absorbency and adsorption power, and it has a function of adsorbing gas such as carbon dioxide or ammonia to remove odor and ventilate it to purify the air.

The nylon fiber is 0.5 to 1.5% by weight is added, the polyamide-based synthetic fibers are light, thin, frictional and tensile strength is very large compared to other fibers, the strength does not change even when wet with water, it has elasticity. In the present invention acts as a reinforcing fiber with coconut fiber, but lighter than the coconut fiber and the length and diameter is smaller, evenly dispersed in the mortar to further increase the bending strength and tensile strength of the mortar, the strength does not change easily, the elasticity of the mortar Reinforcement and increase durability. At this time, the nylon fiber has a length of 5 to 20 mm, a diameter of 0.1 to 1.0 mm, it can be used that stretch and good volume, such as stretched wool nylon fibers or crepe nylon fibers.

The polyparaphenylene alkylenedicarboxylate improves the workability of the mortar generated over time, exhibits high sensitivity, imparts fluidity in the mortar, and 0.5 to 1.5 wt% is added thereto.

The amide wax is added by 0.5 to 1.5% by weight, is prepared by the condensation reaction of the organic acid and the amine, and swells to form a gel structure, excellent in thixotropic properties and stability due to the network structure of the swelling particles, polyparaphenylene The use of alkylenedicarboxylates increases diminishing pixotropic properties and increases adhesion.

The sodium citrate is a retardant for preventing the mortar from rapidly curing, and 0.05 to 0.5 wt% is added.

In addition, the mortar for repairing the cross section of the concrete structure according to the present invention in addition to the above-mentioned composition by weight, sodium polyacrylate is 0.5 to 1.5%, dipropylene glycol diacrylate 0.5 to 1.5%, 3-glycidoxy Propylmethyldiethoxysilane may further comprise 0.5 to 1.5%, dicyclohexylcarbodiimide 0.5 to 1.5%, lithium nitrate 0.5 to 1.5%, aluminum nitrate 0.5 to 1.5%, zinc oxide 0.1 to 1.0%.

The sodium polyacrylate is produced by polymerizing an acrylic acid amide monomer under a hydrogen peroxide catalyst, containing 0.5 to 1.5% by weight to adjust the viscosity of the dimethylaminoethyl methacrylate and emulsify the properties to maintain adhesion In addition, the adhesion is increased, the difference due to the contraction and expansion caused by the external temperature difference is reduced, and a film is formed to prevent corrosion of the mortar.

The dipropylene glycol diacrylate functions as a crosslinking agent and preferably contains 0.5 to 1.5% by weight.

The 3-glycidoxypropylmethyldiethoxysilane is added in an amount of 0.5 to 1.5% by weight to increase adhesion and adhesion.

The dicyclohexylcarbodiimide is contained by 0.5 to 1.5% by weight to act as a curing agent to promote the curing rate.

The lithium nitrate and aluminum nitrate have excellent corrosion resistance and flame resistance, and can prevent erosion of the road surface by fixing chlorine ions to resist penetration of chlorine ions, and for this purpose, 0.5 to 1.5 wt% is added thereto.

The zinc oxide is included in the 0.1 to 1.0% by weight, it is hydrophilic, so that the contact angle does not occur when the water is in contact with the mortar is evenly spread on the surface and can be easily removed even if the road surface is contaminated.

In addition, the mortar for repairing the cross section of the concrete structure according to the present invention is, in weight percent, 1 to 5% of the silicate mixture, 1 to 3% of lithium hydrogen phosphate, 1 to 3% of vinyl versatate polymer, and 0.1 to 1.0 of mineral fiber. %, Charcoal powder may further comprise 0.1 to 1.0%, sericite 0.05 to 0.5%, and 2-ethylhexanoic acid 0.05 to 0.5%.

1 to 5% by weight of the silicate mixture is added to increase the surface strength of the mortar, and excellent chemical resistance and corrosion resistance to increase the durability of the mortar, and the inorganic bonds tightly and firmly adhered to the ocher powder of the primer .

These silicate mixtures include sodium silicate 30-40 wt%, potassium silicate 20-30 wt%, lithium silicate 20-30 wt%, silica sol 5-10 wt%, and alkali giving and degradation of the carbonated portion is expected. It can restore the performance of concrete, such as strengthening the site. Here, silica sol is a colloid in which fine particles of silicic acid are dispersed in a dispersion medium such as water, and is used as a binder.

The lithium hydrogen phosphate is an inorganic material made by dissolving lithium phosphate in nitric acid and evaporating the residue in water to evaporate it on sulfuric acid. It prevents neutralization by CO ₂ of concrete structures, preventing degradation of strength and durability, and hydration of cement. 1 to 3% by weight is added to protect the product, and less than 1% by weight may lower the anti-neutralization function of the mortar, and when it exceeds 3% by weight, the hydration reaction of the cement may be delayed, resulting in insufficient initial strength expression. May occur.

The vinyl versatate polymer may be added in an amount of 1 to 3 wt%, thereby forming an elastic film in the mortar to increase the watertightness of the mortar, and may increase the adhesion at the boundary between the primer and the mortar.

The mineral fiber is added 0.1 to 1.0% by weight, and the inorganic silica bond with the silicate mixture to increase the bonding strength between the mortar tissues, to prevent cracking during the drying and curing of the mortar, and to increase the resistance to fatigue and load .

In addition, more than 0.1 to 1.0% by weight of charcoal powder may be added. White charcoal is made from solid wood such as oak wood, and carbonized more than gum charcoal. The bark of charcoal is almost disappeared during the manufacturing process, and the surface is white due to ash. 95% ash, containing about 2% ash, containing a small amount of moisture. These charcoal powders contain many minerals, absorb odors and moisture, generate negative ions, purify the air, and emit far infrared rays.

Since the sericite is contained in the 0.05 to 0.5% by weight, it is made of a small scale or leaf structure, the particles are fine, provide excellent coating force to protect the mortar, and to prevent the viscosity of the mortar to decrease the adhesion To be maintained.

The 2-ethylhexanoic acid is added so that the mortar layer is uniformly formed, and if it is added excessively, the strength is lowered, so it is preferable to include 0.05 to 0.5% by weight.

In addition, the elastic composite resin, in weight%, 20 to 30% EVA resin, 20 to 30% polyolefin resin, 10 to 20% silicone resin, 5 to 10% urethane (meth) acrylate oligomer, polyether siloxane 1 to 5% of polymer, 1 to 5% of glass fiber, 1 to 5% of methylenediphenyl diisocyanate, 1 to 5% of polyvinylpyrrolidone, 0.5 to 1.5% of tetrahydrofurfuryl methacrylate, 2,2-di It may comprise 0.5 to 1.5% of methyltrimethylene acrylate, 0.5 to 1.5% of N-butyl methacrylate, and 0.5 to 1.5% of 2-ethylphenoxymethacrylate.

The EVA resin is a polymer obtained by copolymerizing ethylene and vinyl acetate monomer, and has excellent elasticity and flexibility, has a buffering effect, prevents crack generation, is not easily broken due to durability, and has excellent coating ability and excellent water retention and water repellency. And it is excellent in rust resistance and can be used at high temperature and high humidity conditions, due to such a property in the present invention, 20 to 30% by weight is added.

The polyolefin resin provides elasticity and improves rigidity and heat resistance, and may exhibit thermal stability even when the temperature rises due to heating of concrete surface, and flowability is improved due to low viscosity when mixed with silicone resin and elastic composite resin. The elasticity of can be maintained. Isotactic polypropylene can be used as such polyolefin resin. The polyolefin-based resin is preferably included in 20 to 30% by weight, if less than 20% by weight may reduce the flow and heat resistance, and when it exceeds 30% by weight may reduce the strength.

The silicone resin has elasticity and elasticity, exhibits excellent moisture resistance, can be used even at high temperature and high humidity conditions, and has excellent storage properties. For this purpose, the silicone resin is preferably contained in an amount of 10 to 20% by weight. The elasticity and flexibility may be degraded and cracks may be generated. If it exceeds 20% by weight, heat resistance and flowability may be reduced, making it difficult to use.

The urethane (meth) acrylate oligomer is obtained by reacting a polyol and a polyisocyanate compound, and has excellent adhesion, excellent flexibility, hardness, light resistance, and the like, and is preferably contained in an amount of 5 to 10 wt%, and 15 wt% If it exceeds, dispersibility and flowability may fall.

The polyether siloxane copolymer is a copolymer of polyether and siloxane, and has excellent heat resistance and abrasion resistance, and adds 1 to 5 wt%.

The glass fiber is contained 1 to 5% by weight evenly dispersed in the elastic composite resin to strengthen the properties of the EVA resin, and increase the corrosion resistance and heat resistance to prevent cracking or sulphate deformation.

The methylene diphenyl diisocyanate is an aromatic diisocyanate chemical, which forms a thin film on the elastic composite resin to prevent oxidation and hardening of the elastic composite resin so that the elasticity can be maintained continuously, and the road surface temperature is excellent due to excellent heat resistance. It improves durability by resisting an increase, and for this purpose, it is preferably included in an amount of 1 to 5% by weight, and when it exceeds 5% by weight, flowability may be lowered.

The polyvinylpyrrolidone is a polymer of N-vinyl-2-pyrrolidone, acts as a binder, is resistant to acids, adds 1 to 5% by weight, and exceeds 5% by weight dispersibility and flowability This can be degraded.

The tetrahydrofurfuryl methacrylate is added to 0.5 to 1.5% by weight to function as a diluent to excellent adhesion.

The 2,2-dimethyltrimethylene acrylate is composed of a plurality of double bonds, multiple bonds and esters, excellent bonding strength and adhesion, for this purpose may comprise 0.5 to 1.5% by weight.

The N-butyl methacrylate is added to 0.5 to 1.5% by weight to improve the dispersion and adhesion of the elastic composite resin.

The 2-ethylphenoxy methacrylate is an aromatic methacrylate, lowers the coefficient of friction, excellent wear resistance, and preferably contains 0.5 to 1.5% by weight in order to express such properties.

Hereinafter, with reference to the drawings will be described in detail with respect to the cross-sectional repair method of the concrete structure according to the present invention.

3a and 3b, the cross-sectional repair method of the concrete structure according to the present invention performs the step (S10) to check and select the damaged cross-sectional area of the concrete structure that needs repair first. That is, when the deterioration of the concrete structure is confirmed, the damaged section to be repaired is identified, selected or marked to prepare for a plurality of operations.

Then, the chipping step (S20) is performed to clean the surface by chipping, washing and drying the selected section to be repaired. Concrete chipping is intended to remove cross-sections with tools or machines, to roughen the surface of smooth concrete, to increase surface area and to improve adhesion. At this time, the removal of the cross-sectional area is preferably removed so that the corner portion is a right angle, but is not limited thereto, and may be removed so that the corner portion does not become a right angle.

After performing the chipping step, it is preferable to remove the neutralized part, and confirming and removing the neutralized progression part from the chipped cross-sectional area, and applying an alkali agent after cleaning using sandblasting or the like to further strengthen the surface (S30). Can be done.

Hardened concrete exhibits strong alkalinity (pH 12 ~ 13) by containing calcium hydroxide as a hydration product of cement, and carbon dioxide (CO ₂ ) or acid rain in air is chemically reacted with calcium hydroxide (Ca (OH) ₂ ) in concrete and gradually As it becomes calcium carbonate (CaCO ₃ ), neutralization or carbonation occurs that loses alkalinity of concrete. If the pH inside the concrete is 11 or higher, a passivation film is formed on the surface of the rebar so that it does not rust even if oxygen is present.However, if the pH is lower than 11 due to neutralization, the rebar will be rusted. do. In other words, the steel is corroded by the neutralization of the concrete (pH 8.5 ~ 10) and the expansion pressure is generated. If the expansion pressure exceeds the concrete stress, cracking occurs, and water and carbon dioxide penetrate into the crack portion, and the deterioration proceeds rapidly. The neutralization judgment determines that the portion which does not change color is neutralized because the alkaline portion appears reddish purple when the alcohol solution of 1% phenolphthalein is sprayed on the concrete. Therefore, phenolphthalein is applied to the surface of the removed cross-sectional area to confirm neutralization, and the concrete of the neutralized portion that does not change color is continuously removed. If the surface strength of the removed cross-section is weak, apply alkaline agent to strengthen the surface.

In addition, after performing the chipping step, when the rebar is exposed to the chipped site, it is possible to further perform the step (S40) of removing the rust of the rebar, and applying a rust preventive to the rebar.

Next, a step (S50) of applying a primer to the chipped cross-sectional area (cutting surface) is performed. The primer is applied to increase the adhesion on the interface between the chipped cross section and the repair mortar, and is applied to the cross section using a brush or a roller to increase the specific surface area of the surface.

The primer is, by weight%, 25 to 40% EVA resin, 10 to 20% polyethersiloxane copolymer, 10 to 20% urethane (meth) acrylate oligomer, 5 to 10% latex resin, 5 to 10 natural scrubber fragments %, Ocher powder 5-10%, 2,2-dimethyltrimethylene acrylate 1-5%, polyvinylpyrrolidone 1-5%, N-butyl methacrylate 1-5%, 2-ethylphenoxy Cimethacrylate 1 to 5%, tri3-mercaptopropionyloxyethic isocyanurate (TEMPIC) 0.5 to 2%, mercaptopropyltriethoxysilane 0.5 to 1.5%, dipropylene glycol diacrylate 0.5 To 1.5%, bis (3-ethyl-5-methyl-4-maleimidephenyl) methane 0.5 to 1.5%, acrylic emulsion resin 0.5 to 1.5%, alkylbenzenesulfonate 0.5 to 1.5%, 3-glycidoxy Propylmethyldiethoxysilane from 0.5 to 1.5%.

The EVA resin is a polymer obtained by copolymerizing ethylene and vinyl acetate monomer, and has excellent elasticity and flexibility, has a buffering effect, prevents crack generation, is not easily broken due to durability, and has excellent coating ability and excellent water retention and water repellency. And it is excellent in rust resistance and can be used at high temperature and high humidity conditions, due to such a property in the present invention adds 25 to 40% by weight.

The polyether siloxane copolymer is a copolymer of polyether and siloxane, and adds 10 to 20% by weight, which is excellent in heat resistance, corrosion resistance, and abrasion resistance.

The urethane (meth) acrylate oligomer is obtained by reacting a polyol and a polyisocyanate compound, and has excellent adhesion to prevent peeling of the layer, and excellent in flexibility, hardness, light resistance, and the like, and is preferably contained in an amount of 10 to 20% by weight. However, if it exceeds 20% by weight, dispersibility and flowability may decrease.

The latex resin is excellent in fouling resistance, and excellent in resistance to penetration of chlorine ions, and can inhibit corrosion of reinforcing bars due to penetration of chlorine ions, and is preferably added in an amount of 5 to 10 wt%.

The natural scrubber fragment is added to 5 to 10% by weight, and the natural scrubber refers to the dry spongy tissue portion of the fruit of the scrubber cucumber, and has a fiber in the form of a net, the network structure of the natural scrubber has a rough surface It is composed of 5 to 15 mm sized fragments, which are dispersed evenly in the primer to increase the specific surface area of the surface through the network and roughness of the fragments, thereby increasing the adhesion between the damaged cross-sectional area and the mortar of the concrete structure. . If the size of the fragment is less than 5 mm, the adhesive force is lowered, and if the size exceeds 15 mm, workability may be reduced.

The ocher powder is contained 5 to 10% by weight, its components include silica, alumina, iron, magnesium, sodium, kali, etc., and emit a large amount of far infrared rays, consisting of a honeycomb structure to form a multi-layer structure having a large number of spaces It has a purifying action such as toxin removal, excellent breathability, humidity control, and deodorizing function, and has a strong and tightly bonded inorganic bond with the mortar silicate mixture.

The 2,2-dimethyltrimethylene acrylate is composed of a plurality of double bonds, multiple bonds and esters, excellent bonding strength, excellent adhesion to fix the layer to prevent peeling, for this 1 to 5% by weight May be included.

The polyvinylpyrrolidone is a polymer of N-vinyl-2-pyrrolidone, acts as a binder, is resistant to acids, adds 1 to 5% by weight, and exceeds 5% by weight dispersibility and flowability This can be degraded.

The N-butyl methacrylate adds 1 to 5% by weight to improve the dispersibility and adhesion of the layer.

The 2-ethylphenoxy methacrylate is an aromatic methacrylate, which is excellent in wear resistance, and preferably contains 1 to 5% by weight in order to express such properties.

The tri3-mercaptopropionyloxyethic isocyanurate (TEMPIC) is a polythiol resin containing two or more thiol groups in a molecule, which increases adhesion and maintains adhesion and stability even in a high temperature or high humidity environment. It is added to increase the reliability, it is preferably included in 0.5 to 2% by weight.

The mercaptopropyl triethoxysilane is contained by 0.5 to 1.5% by weight to penetrate a few mm below the cross-sectional area of the concrete to increase the concrete reinforcement performance.

The dipropylene glycol diacrylate functions as a crosslinking agent and preferably contains 0.5 to 1.5% by weight.

The bis (3-ethyl-5-methyl-4-maleimidephenyl) methane is a compound having a maleimide group, and is 0.5 to 1.5% by weight to function as a crosslinking aid to promote the reaction.

The acrylic emulsion resin is mixed in small amounts of 0.5 to 1.5% by weight to increase the corrosion resistance and weather resistance.

0.5 to 1.5% by weight of the alkylbenzenesulfonate is added to function as a stable emulsifier and increase dispersibility.

The 3-glycidoxypropylmethyldiethoxysilane is added to 0.5 to 1.5% by weight to increase the adhesion and adhesion.

Then, the pouring step (S60) of mixing the above-mentioned repair mortar with water in the cross section of the primer is applied. If the primer applied to the cross-section becomes sticky, the repairing mortar is plastered to restore the cross-section.

Then, the curing step (S70) for curing the mortar is poured.

Then, the step of applying a surface protective material on the surface of the mortar cured (S80) to perform a protective measure so that there is no external impact on the recovered cross-sectional area. It may be constructed once or may be constructed plural times. In the surface protection method of coating and finishing the surface protection material, the surface layer is impregnated to modify the surface layer by impregnating the surface protection material, but penetrates the crack and forms a hydrophobic surface (water repellent layer) over a range of several tens of micrometers from the surface to prevent water or chloride. It is possible to prevent ingress of deterioration factors such as ions, to impart alkali to resist neutralization (carbonation), to restore performance, and to prolong the life of recovered concrete.

The surface protective material, in weight percent, aqueous urethane resin 40 to 55%, potassium silicate 10 to 20%, kaolin powder 5 to 10%, silica powder 5 to 10%, lithium sulfate 3 to 5%, urethane (meth) acrylic Rate oligomer 3 to 5%, methylenediphenyl diisocyanate 3 to 5%, teflon resin 1 to 3%, glass fiber 1 to 3%, toluene-2, 4-diisocyanate 1 to 3%, 4,4'- Diaminodiphenylamine 0.5 to 2.0%, 1,6-hexanedioldiacrylate 0.5 to 1.5%, N- [4- (2-benzoimidazolyl) phenyl] maleimide 0.5 to 1.5%, dibutyl 0.5 to 1.5% of tindilaurate, 0.5 to 1.5% of butyl alcohol acrylate, 0.5 to 1.5% of pine needle powder, 0.5 to 1.5% of pigment, 0.1 to 1.0% of glidant, 0.05 to 0.5% of thickener, 0.05 to 0.5% of water repellent It includes.

The aqueous urethane resin has excellent mechanical properties such as elasticity, tensile strength, and adhesive strength, and has excellent heat resistance, hydrolysis stability, scratch resistance, water resistance and fouling resistance, and when less than 40 wt%, flexibility and adhesion decrease. If the content exceeds 55% by weight, the workability and air permeability may be lowered, resulting in swelling of the coating and impairing function.

The potassium silicate is contained in 10 to 20% by weight, imparts alkali to the neutralized (carbonized) portion, restores the performance of the degraded concrete, and reinforces the site where the performance degradation of the mortar is expected. In order to improve the permeability, a surfactant or a reaction accelerator may be further added and used.

The kaolin powder is a heat treatment of the kaolin mineral at 600 ~ 800 ℃ to remove and activate the binding water and interlayer water in the kaolin to give reactivity, the main components are SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ , 5 to 10% by weight is added to react with calcium hydroxide produced by the hydration of cement to form calcium silicate hydrate to densify the structure, and to reduce the amount of calcium hydroxide mainly produced at the interface with silica powder, thereby making the surface protective material durable. And to increase the adhesion strength to prevent the lifting of the coating film. When the kaolin powder exceeds 10% by weight, the viscosity is increased to reduce workability.

5 to 10% by weight of the silica powder may be added to prevent cracking of the layer and to ensure workability.

The lithium sulfate is added as 3 to 5% by weight is used as an inorganic filler, to ensure breathability to prevent the coating film from lifting or swelling, if it exceeds 5% by weight may reduce the flexibility and adhesion of the layer.

The urethane (meth) acrylate oligomer is obtained by reacting a polyol and a polyisocyanate compound, and has excellent adhesion, thereby increasing adhesion, preventing peeling, and having excellent flexibility, hardness, and the like. However, if it exceeds 5% by weight, dispersibility and flowability may decrease.

The methylene diphenyl diisocyanate is an aromatic diisocyanate chemical, and has excellent heat resistance and light resistance, thereby improving durability by increasing the temperature of the road surface, and preferably contained in an amount of 3 to 5% by weight, and more than 5% by weight. The flow may be degraded.

The Teflon resin, which contains 1 to 3% by weight, forms a very stable chemical due to the strong chemical bonding of fluorine and carbon, and has properties such as chemical inertness, heat resistance, insulation stability, and low coefficient of friction. It stably protects the floor and prevents adhesion of external debris to prevent the adhesion of pollutants such as automobile dust, soil particles, ammonium sulfate, etc. on the exterior wall of the building, increasing pollution resistance and increasing durability of the floor.

The glass fiber enhances the properties of Teflon resin, and increases the corrosion resistance and heat insulation. If the glass fiber exceeds 3% by weight, the layer may wear out and be damaged, so it is preferable to contain 1 to 3% by weight.

The toluene-2 and 4-diisocyanate are diisocyanate chemicals, and have excellent heat resistance and corrosion resistance, improve durability of the layer by resisting external high temperature, and preferably include 1 to 3 wt%. If it exceeds 3% by weight, the flowability may be lowered.

The 4,4'-diaminodiphenylamine amine-based additive is preferably added in an amount of 0.5 to 2 wt% to increase corrosion resistance and durability.

The 1,6-hexanediol diacrylate functions as a crosslinking agent and is preferably contained in 0.5 to 1.5% by weight, and the N- [4- (2-benzoimidazolyl) phenyl] maleimide is malein. It is preferable that the compound having a mid group serves as a crosslinking aid and has high reactivity to promote the reaction and contain 0.5 to 1.5 wt%.

It is preferable to increase the dibutyl tin dilaurate chemical reaction rate and promote crosslinking to activate crosslinking, and 0.5 to 1.5 wt% is included, and the butyl alcohol acrylate is 0.5 to 1.5 wt% to increase dispersibility. % May be included.

The pine needle powder may be added 0.5 to 1.5% by weight, and the pine needle powder may increase the durability of the layer by deodorizing, antiseptic and antibacterial action.

The pigment is 0.5 to 1.5% by weight, to give a color to the surface protective material applied to the surface repair mortar to improve the aesthetics of the finish surface, titanium oxide may be used, in addition to the coloring for various colors Pigments may be used.

In addition, 0.1 to 1.0% of a fluidizing agent, 0.05 to 0.5% of a thickener, and 0.05 to 0.5% of a water repellent may be further included.

As such, the cross-section of the concrete structure constructed in accordance with the cross-sectional repair method of the concrete structure of the present invention, as shown in Figure 1a to 2b, the primer (cutting surface 1a) of the chipped concrete (1) of the concrete structure ( 10) is formed, when the rebar (2) is exposed to the cross-sectional area to remove the rust of the reinforcing bar (2), to apply a rust preventive agent (2a) to the reinforcing bar (2), the chipped cross-sectional site is a repair mortar (20) Filled with, the surface of the concrete filled with the repair mortar 20 is finished by applying a surface protective material (30).

Hereinafter, an embodiment of the mortar for repairing the cross section of the concrete structure according to the present invention.

Invention Example 1

By weight, Portland Cement 25%, Aggregate 45%, Steel slag 5%, Elastomer 5%, Dimethylaminoethyl methacrylate 4%, Calcium sulfoaluminate 4%, Silica fume 2%, Coconut fiber 2%, Other additives such as 1% hydroxy copper carbonate, 1% pearlite, 1.0% attapulgite, 1.0% nylon fiber, 1.0% polyparaphenylene alkylenedicarboxylate, 0.9% amide wax, 0.1% sodium citrate and balance hardener A repair mortar was formed, and 50 parts by weight of water was added to the mixer with the repair mortar with respect to 100 parts by weight of the Portland cement, and mixed and stirred for 5 minutes to form a concrete test body.

Invention Example 2

By weight, Portland cement 24%, Aggregate 44%, Steel slag 5%, Elastomer 5%, Dimethylaminoethyl methacrylate 4%, Calcium sulfoaluminate 4%, Silica fume 2%, Coconut fiber 2%, Copper carbonate 1%, pearlite 1%, attapulgite 1.0%, nylon fiber 1.0%, polyparaphenylene alkylenedicarboxylate 1.0%, amide wax 0.9%, sodium citrate 0.1%, sodium polyacrylate 0.5%, dipropylene glycol diacrylate 0.5%, 3-glycidoxypropylmethyldiethoxysilane 0.5%, dicyclohexylcarbodiimide 0.5%, lithium nitrate 0.5%, aluminum nitrate 0.5%, zinc oxide 0.5% and Retaining mortar consisting of the balance and other additives was formed, and 50 parts by weight of water was added to the mixer with the repair mortar with respect to 100 parts by weight of the Portland cement, mixed and stirred for 5 minutes to form a concrete test body.

Invention Example 3

By weight, Portland Cement 23%, Aggregate 44%, Steel slag 5%, Elastomer 5%, Dimethylaminoethyl methacrylate 4%, Calcium sulfoaluminate 4%, Silica fume 2%, Coconut fiber 2%, Copper carbonate 1%, pearlite 1%, attapulgite 1.0%, nylon fiber 1.0%, polyparaphenylene alkylenedicarboxylate 1.0%, amide wax 0.9%, sodium citrate 0.1%, silicate mixture 1%, Lithium hydrogen phosphate 1%, vinyl versatate polymer 1%, mineral fiber 0.5%, charcoal 0.5%, sericite 0.25, 2-ethylhexanoic acid 0.25 and the balance other additives, the silicate mixture is To form a repair mortar consisting of 40% by weight of sodium silicate, 25% potassium silicate, 25% lithium silicate, 10% silica sol, 50 parts by weight of water with respect to 100 parts by weight of the Portland cement with the repair mortar The mixture was added to the mixer and mixed and stirred for 5 minutes to form a concrete test specimen.

Comparative Example 1

By weight, by mixing and stirring Portland cement 65%, calcium alumina cement 25%, blast furnace slag 6%, zeolite 3%, kaolin 1% to form a cement binder, by weight% hydrophobic acrylic emulsion 95%, polyvinylacetate ethylene 2% latex, 2% polystyrene acrylic ester latex, 0.5% methacrylamide monomer and 0.5% sodium persulfate as a reaction initiator were mixed and stirred to form a polymer admixture. Then, 13 parts by weight of the cement binder, 47 parts by weight of aggregate, and 30 parts by weight of coarse aggregate were added to the mixer and forcedly stirred. Then, 6 parts by weight of water and 4 parts by weight of polymer admixture were further mixed and stirred for 5 minutes to prepare a concrete test body.

<Test Example 1>

The concrete test specimens of Inventive Examples 1 to 3 and Comparative Example 1 were subjected to a compressive strength measurement test based on KS F 2405 and the measurement results are shown in Table 1 below.

TABLE 1

<Test Example 2>

The flexural strength measurement test was performed on the concrete test specimens of Inventive Examples 1 to 3 and Comparative Example 1 based on KS F 2408, and the measurement results are shown in Table 2 below.

TABLE 2

<Test Example 3>

The adhesive strength measurement test was performed on the concrete test specimens of Inventive Examples 1 to 3 and Comparative Example 1 based on KS F 2762 and the results are shown in Table 3 below.

TABLE 3

<Test Example 4>

The dry shrinkage measurement test was performed on the concrete test specimens of Inventive Examples 1 to 3 and Comparative Example 1 based on KS F 2424 and the measurement results are shown in Table 4 below.

TABLE 4

As can be seen from the measurement results of Table 1 to Table 4, the repair mortar according to the present invention can be confirmed that the compressive strength, flexural strength, adhesive strength and dry shrinkage rate is very excellent.

As a result, the cross section repair mortar of the concrete structure according to the present invention and the cross section repair method of the concrete structure using the same, the strength and adhesion sustainability of the repair mortar is excellent, the cracks of the construction mortar is suppressed and the cross-sectional fall prevention, The degradation of strength and durability due to the neutralization of concrete is prevented, the corrosion of reinforcing bars is suppressed, the durability of the structure is increased, and the structural stability of the concrete structure is exerted to increase the service life.

In the present invention, the above embodiment is an example, and the present invention is not limited thereto. Anything that has substantially the same configuration as the technical idea described in the claims of the present invention and achieves the same working effects is included in the technical scope of the present invention.

1. Concrete
1a. Cut cotton
2. Rebar
2a. Rust preventive
10. Primer
20. Mortar for Repair
30. Surface Protective Materials

Claims (9)

By weight%, Portland cement 20-30%, Aggregate 40-50%, Steel slag 5-10%, Elastomer 5-10%, Dimethylaminoethyl methacrylate 3-5%, Calcium sulfoaluminate 3-3 5%, silica fume 1-3%, coconut fiber 1-3%, hydroxy copper carbonate 1-3%, pearlite 1-3%, attapulgite 0.1-1.5%, nylon fiber 0.5-1.5%, polyparaphenylene Mortar for repairing a cross section of a concrete structure comprising 0.5 to 1.5% of alkylenedicarboxylate, 0.5 to 1.5% of amide wax, and 0.05 to 0.5% of sodium citrate.
The method of claim 1,
By weight, sodium polyacrylate is 0.5 to 1.5%, dipropylene glycol diacrylate is 0.5 to 1.5%, 3-glycidoxypropylmethyldiethoxysilane is 0.5 to 1.5%, dicyclohexylcarbodiimide 0.5 to 1.5 %, Lithium nitrate 0.5 to 1.5%, aluminum nitrate 0.5 to 1.5%, zinc oxide 0.1 to 1.0% further comprising a mortar for repairing the concrete structure.
The method of claim 1,
By weight%, silicate mixture 1 to 5%, lithium hydrogen phosphate 1 to 3%, vinyl versatate polymer 1 to 3%, mineral fiber 0.1 to 1.0%, charcoal powder 0.1 to 1.0%, sericite 0.05 to 0.5% , Further comprising 0.05 to 0.5% of 2-ethylhexanoic acid,
The silicate mixture is 30 to 40% by weight of sodium silicate, 20 to 30% by weight of potassium silicate, 20 to 30% by weight of lithium silicate, silica sol 5 to 10% by weight of the mortar for repairing the concrete structure.
The method of claim 1,
The elastic composite resin is 20 to 30% by weight EVA resin, 20 to 30% polyolefin resin, 10 to 20% silicone resin, 5 to 10% urethane (meth) acrylate oligomer, 1 to 1 polyether siloxane copolymer 5%, glass fibers 1-5%, methylenediphenyldiisocyanate 1-5%, polyvinylpyrrolidone 1-5%, tetrahydrofurfuryl methacrylate 0.5-1.5%, 2,2-dimethyltrimethylene Mortar for section repair of concrete structures, comprising 0.5 to 1.5% acrylate, 0.5 to 1.5% N-butyl methacrylate, 0.5 to 1.5% 2-ethylphenoxymethacrylate
Identifying and selecting a damaged section of the concrete structure requiring repair;
A chipping step of chipping, washing, and drying the selected cross-sectional area to be repaired to clean the surface;
Applying a primer to the chipped cross-sectional area;
A casting step in which any one of the repair mortars selected from claims 1 to 4 is mixed with water and poured on the cross-section of the primer;
A curing step of curing the poured mortar; And
Section repair method of the concrete structure comprising the step of applying a surface protective material on the surface of the mortar cured.
The method of claim 5,
After performing the chipping step, the step of repairing the concrete structure of the concrete structure further comprises the step of checking the removal of the neutralization progression in the chipped cross-sectional area, and applying an alkali agent after cleaning to strengthen the surface.
The method of claim 5,
After performing the chipping step, if the rebar is exposed to the chipped site, removing the rust of the reinforcing bar, and applying a rust preventive to the reinforcement of the concrete structure further comprises a step.
The method of claim 5,
The primer is, by weight%, 25 to 40% EVA resin, 10 to 20% polyethersiloxane copolymer, 10 to 20% urethane (meth) acrylate oligomer, 5 to 10% latex resin, 5 to 10 natural scrubber fragments %, Ocher powder 5-10%, 2,2-dimethyltrimethylene acrylate 1-5%, polyvinylpyrrolidone 1-5%, N-butyl methacrylate 1-5%, 2-ethylphenoxy Cimethacrylate 1 to 5%, tri3-mercaptopropionyloxyethic isocyanurate (TEMPIC) 0.5 to 2%, mercaptopropyltriethoxysilane 0.5 to 1.5%, dipropylene glycol diacrylate 0.5 To 1.5%, bis (3-ethyl-5-methyl-4-maleimidephenyl) methane 0.5 to 1.5%, acrylic emulsion resin 0.5 to 1.5%, alkylbenzenesulfonate 0.5 to 1.5%, 3-glycidoxy Sectional repair method for concrete structures containing 0.5 to 1.5% of propylmethyldiethoxysilane.
The method of claim 5,
The surface protective material, in weight percent, aqueous urethane resin 40 to 55%, potassium silicate 10 to 20%, kaolin powder 5 to 10%, silica powder 5 to 10%, lithium sulfate 3 to 5%, urethane (meth) acrylic Rate oligomer 3 to 5%, methylenediphenyl diisocyanate 3 to 5%, teflon resin 1 to 3%, glass fiber 1 to 3%, toluene-2, 4-diisocyanate 1 to 3%, 4,4'- Diaminodiphenylamine 0.5 to 2.0%, 1,6-hexanedioldiacrylate 0.5 to 1.5%, N- [4- (2-benzoimidazolyl) phenyl] maleimide 0.5 to 1.5%, dibutyl 0.5 to 1.5% tindilaurate, 0.5 to 1.5% butyl alcohol acrylate, 0.5 to 1.5% pine needle powder, 0.5 to 1.5% pigment, 0.1 to 1.0% glidant, 0.05 to 0.5% thickener, 0.05 to 0.5% water repellent Section repair method of concrete structure comprising a.

Images