KR102200657B1 - Section recovery composites for concrete constructions, and section recovery method of the concrete construction for preventing neutralization and corrosision caused by salts and chemicals using the same - Google Patents

Abstract

The present invention relates to a concrete cross-section restoration composition and a cross-section restoration method of a concrete structure damaged by neutralization, salt damage, and chemical corrosion using the same, and specifically, the concrete cross-section restoration composition is 30 to 40 wt% of general cement or slag cement, Silica sand 30 to 58 wt%, expansion material 5 to 10 wt%, nano metal material 1 to 10 wt%, admixture 5 to 20 wt%, reinforcing material 0.1 to 1.5 wt%, fluidizing agent 0.2 to 1.5 wt%, multi-walled carbon nanotubes, bundle type carbon nano Tubes, carbon nanoplates, plate-shaped graphite, graphene, and at least one nano-carbon material selected from the group consisting of graphene oxide 0.01 to 3 wt%, and anionic or nonionic dispersant 0.5 to 3 wt%, and a concrete structure The section restoration method of the concrete structure is the step of removing foreign substances and deteriorated parts of the concrete structure, washing the foreign substances of the concrete structure with high pressure washing water, applying the surface reinforcement to the concrete structure, and the concrete section repairing material on the surface reinforcement application area. And applying the composition, applying a surface protective material thereon, and uniformly applying the ceramic coating material after applying the surface protective material.

Description

Concrete cross-section restoration composition and a method of recovering the cross-section of concrete structures that have been damaged by neutralization, salt damage, and chemical corrosion using the same. USING THE SAME}

The present invention relates to a concrete cross-section restoration composition and a repair method of a concrete structure using the same, and more particularly, to recover the deterioration phenomenon in the cross-section of a concrete structure damaged by intrusion of chloride, neutralization of concrete, and chemical corrosion. It relates to the composition of the section repair material and the section repair and repair method of concrete structures.

Concrete is generally the most commonly used building material for buildings, and such concrete buildings can contribute to the national economy as a national infrastructure only when they become the national infrastructure and maintain a safe life for a long period of time.

However, it is difficult to expect a semi-permanent life expectancy of more than 100 years for concrete structures any longer due to air pollution such as pollution and acid rain, or the release of fine dust or changed environmental substances. In particular, concrete needs to maintain alkalinity to maintain the life of the structure for a long period of time.If it is neutralized or corroded by salt damage or chemical substances, the reinforcing bar, the main material of reinforced concrete, is corroded and the overall life of the concrete structure. This remarkably shortening phenomenon occurs.

In other words, since it has strong alkalinity (pH 12-13) by Ca(OH) ₂ generated by the hydration reaction of cement, the reinforcing bars embedded in concrete are generally not corroded. However, if the action of carbon dioxide gas (carbon dioxide) in the air is received for a long time, the calcium hydroxide in the concrete gradually changes to calcium carbonate and the pH is lowered, resulting in neutralization or carbonation in which the concrete loses its alkalinity. The chemical reaction equation is as follows.

Ca(OH) ₂ + CO ₂ → CaCO ₃ + H ₂ O

In addition to carbon dioxide gas, even when acidic chemicals enter the concrete, a neutralization phenomenon occurs in which the alkalinity of the concrete is neutralized. Exhaust gas from automobiles and sulfurous acid gas (SO2) in briquette gas are representative examples. Moreover, as a foreign agent of special neutralization or deterioration, there are inorganic acids such as sulfuric acid, hydrochloric acid and nitric acid, and organic acids such as seokic acid. The reason why neutralization is important is not about the concrete itself, but because the reinforcing bars in the concrete corrode. If the building is neutralized from the inside of the rebar, the rebar in the neutralized part begins to corrode, but the reinforcement in the alkali part does not corrode yet. When corrosion occurs in reinforcing bars, the volume due to rust increases remarkably and cracks occur depending on the reinforcement by destroying the covered concrete. Moisture and oxygen required for corrosion are supplied through the cracks, which accelerates the corrosion of the reinforcing bar more and more, and when this accumulates, the coated concrete is peeled off and removed, thereby exposing the rebar.

As a technology for preventing and repairing salt damage, neutralization, and chemical corrosion of existing reinforced concrete structures, cleaning work is performed after removing foreign substances on the surface of the deteriorated structure, and surface protective materials having epoxy-based and general powder properties are applied directly with plaster. There is a general repair method of finishing with epoxy-based and urethane-based coat materials.

However, when the thickness of the general surface protection material is 1 mm or more, there is a problem that cracks are generated on the plastering surface, and the plastering work is difficult because the main ingredient formulation is powder powder. In addition, the coating material is mainly used as an epoxy-based and urethane-based material, but the epoxy-based surface protection material has a problem in that the color changes when exposed to ultraviolet rays, and the urethane-based material is sensitive to temperature shrinkage, and thus, there is a problem that a lifting phenomenon may occur.

Another technique for preventing salt damage, neutralization, and chemical corrosion of existing reinforced concrete structures is to repair by applying a mortar and an epoxy coating after applying a general new and old adhesive to the surface dropping and peeling cross section.

However, common old and new adhesives formed a foreign layer on the concrete surface, which caused the mother body and mortar to fall off again. In addition, the cross-section restoration mortar only provides a cross-section restoration function, and the organic system containing epoxy and urethane as the main component of the coating material becomes brittle after being applied, becomes brittle after being applied, changes color due to ultraviolet rays, and has no ventilation, so moisture in the concrete is pushed out to the surface. There were side effects such as detachment of the attachment part.

Therefore, as a cross-section recovery material used in the cross-section recovery method to prevent rebar corrosion of concrete structures damaged by neutralization, salt damage, and chemical corrosion, it is easy to apply, responds flexibly to ultraviolet rays or external temperature, and prevents cracking. It is necessary to develop a cross-section restoration material that can firmly block the external environment.

The present invention is to solve the above problems and to develop a section repair material used in a section repair method to prevent section damage such as rebar corrosion of a concrete structure damaged by neutralization, salt damage, and chemical corrosion. In particular, it is easy to apply to concrete structures, responds flexibly to ultraviolet rays or external temperatures, has excellent adhesion strength to prevent cracks, and provides a cross-section restoration composition for concrete structures with low water permeability and moisture permeability. Repairs quickly and suppresses corrosion.

Another object of the present invention is to propose a method of repairing a section of a concrete structure using a section repairing material that suppresses corrosion of the concrete structure, and providing a section repairing effect with reinforced water repellency and surface, and securing air permeability to ensure adhesion. And it suppresses re-degradation, and adds an antibacterial function to suppress the generation and activity of fungi, bacteria, and bacteria that coexist on the concrete surface, so that even if the existing coating agent is destroyed, the antimicrobial section restoration material secures the function of resisting chemical corrosion.

Concrete cross-section restoration composition according to an embodiment of the present invention is a general cement or slag cement 30 to 40wt%, silica sand 30 to 58wt%, expansion material 5 to 10wt%, nano metal material 1 to 10wt%, admixture material 5 to 20wt%, At least one nanoparticle selected from the group consisting of reinforcing material 0.1 to 1.5 wt%, fluidizing agent 0.2 to 1.5 wt%, multi-walled carbon nanotubes, bundle carbon nanotubes, carbon nanoplates, plate-shaped graphite, graphene, and graphene oxide 0.01 to 3 wt% of a carbon material, and 0.5 to 3 wt% of an anionic or nonionic dispersant, and the nano carbon material includes the multi-walled carbon nanotubes and the plate-shaped graphite in a ratio of 2:1.

Here, the expanding material is calcium sulfo-aluminate, calcium oxide (Ca0), calcium sulfate (CaSO ₄ ), alumina cement, calcium aluminate hydrate, and calcium sulfo aluminate. It may be any one or more selected from the group consisting of included portland cement (portland cement), but is not limited thereto.

The nano-metal material is copper (Cu), silver (Ag), zinc (Zn), aluminum (AI), silicon (Si), titanium (Ti), molybdenum (Mo), nickel (Ni), having a particle diameter of 1 to 100 nm, It is preferable that it is at least one selected from the group consisting of germanium (Ge), platinum (Pt), tungsten (W), and oxides of these metals.

In addition, the admixture may be pozzolan and/or flyash.

The reinforcing material may be any one or more fiber-reinforced composite materials selected from the group consisting of PP (polypropylene) fibers, cellulose nano-fibers, cellulose, PE (polyethylene) fibers, and aramid fibers. It is not necessarily limited.

In addition, the fluidizing agent may be any one or more selected from the group consisting of melamine-based, naphthalene-based, and carboxyl-based fluidizing agents.

As another embodiment of the present invention, the concrete cross section restoration composition may further include an additional material capable of enhancing the shielding property or rigidity of the concrete structure, specifically boron nitride (BN) 0.01 to 3 wt% can do.

The method of repairing a section of a concrete structure according to an embodiment of the present invention includes removing foreign substances and deteriorated parts of the concrete structure, washing foreign substances of the concrete structure with high pressure washing water, and applying a surface reinforcing material to the concrete structure. Step, applying a concrete cross-section restoration composition on the surface reinforcing material application site, applying a surface protection material thereon, and evenly applying the ceramic coating material after the surface protection material is applied.

Here, the surface reinforcing material may be any one or more selected from the group consisting of a permeable surfactant, a reactive silica, and a silica-based water repellent, but is not limited thereto.

In addition, the surface protective material may be a mixture including cement, silica sand, acrylic polymer, and surfactant, and may be configured to contain or not contain a small amount of cement and silica sand.

The present invention is to develop a concrete cross-section restoration composition containing general cement or slag cement, silica sand, expansion material, nano metal material, admixture, reinforcement material, fluidizing agent, nano carbon material, and anionic or nonionic dispersant, and A cross-section restoration method applied to the neutralized area has been proposed, so it is possible to suppress corrosion of reinforcing bars in concrete buildings due to neutralization and extend the life of the concrete structure.

In addition, in the present invention, since the main material is composed of an inorganic material, the physicochemical behavior is similar to that of the concrete structure to be repaired, so that adhesion to the deterioration repair site can be improved, and breathability can be secured.

In addition, since the cross-section restoration material of the present invention has an antibacterial function, it has the effect of suppressing the generation and activity of fungi, bacteria and bacteria that coexist on the concrete surface.

In addition, the cross-section restoration composition of the present invention is formulated to have an optimal continuous particle size distribution between powders by adjusting the particle diameter of its component materials, so that adhesion/wetability to the repair surface is high, so that both roller and dressing operations are possible. It provides various effects such as securing excellent workability and shortening working time.

1 is a simplified schematic diagram of a concrete structure repaired by a concrete structure section repair method according to an embodiment of the present invention.
2 is a flow chart showing a method for recovering a section of a concrete structure according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may apply various transformations, may be implemented in various different forms, and is not limited to the embodiments described herein. That is, the present invention is not limited to a specific embodiment and should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

The constituents of the composition of the concrete cross section restoration material of the present invention include ordinary cement or slag cement, silica sand, expanding material, nano metal material, admixture, reinforcing material, fluidizing agent, nano carbon material, and anionic or nonionic dispersant.

The specific composition ratio is 30 to 40 wt% of general cement or slag cement, 30 to 58 wt% of silica sand, 5 to 10 wt% of expanding material, 1 to 10 wt% of nanometallic material, 5 to 20 wt% of admixture, 0.1 to 1.5 wt% of reinforcing material, 0.2 to fluidizing agent 1.5 wt%, 0.01 to 3 wt% of the nano carbon material, and 0.5 to 3 wt% of an anionic or nonionic dispersant are not necessarily limited thereto.

General cement can be used as the main component, but slag cement or sulfate-resistant cement can be used. In particular, in the case of structures placed under marine environmental conditions, the use of slag cement or sulfate-resistant cement shows excellent durability characteristics. The content of cement is composed of 30 to 40 wt% of the total weight of the cross-section restoration composition, and if it is less than 30 wt%, the adhesive strength decreases, and if it is more than 40 wt%, the surface strength of the mortar mixed with silica sand (sand) increases. However, because the viscosity of the material increases and the field workability decreases, select an appropriate content ratio according to the characteristics of the concrete structure itself to be repaired or the external environment.

The silica sand is used in an amount of 30 to 58 wt% based on the total weight of the section restoration composition. The weight ratio of general cement or slag cement and silica is not particularly limited, but may be used in a mixing ratio of 1:1 or 1:3 so that a mortar whose mixing ratio is adjusted to suit the characteristics of the cross section of the concrete structure to be restored can be used.

The particle diameter of the silica sand is not particularly limited, but a particle diameter uniformly adjusted to a predetermined particle diameter within the range of 0.05mm to 2mm is used. This is to avoid affecting the dispersibility of the cross-section restoration and the air permeability of the concrete after restoration according to the characteristics and purpose of the concrete structure to be restored.

The composition ratio of the expanding material is not particularly limited, but may be composed of 5 to 10 wt% based on the total weight. The expanding material includes calcium sulfo-aluminate, calcium oxide (Ca0), calcium sulfate (CaSO ₄ ), alumina cement, calcium aluminate hydrate, and calcium sulfo aluminate. Portland cement (portland cement) can be used by mixing at least one or more.

Inorganic expandable material is added to prevent shrinkage cracking of cement. If it is less than 5wt%, it is not effective in reducing the occurrence of cracks due to shrinkage of cement, and if it is more than 10%, swelling or expansion cracking due to expansion occurs. .

As a preferred embodiment of the present invention, the inorganic expandable material included in the cross-section restoration may include a CSA based mineral, that is, calcium sulfo-aluminate, as a main component. When reacting with water, ethringite ( ettringgite) to reduce the drying shrinkage of the cement hardened body and to reduce cracking.

The nanometallic material according to an embodiment of the present invention imparts an antibacterial function that interferes with physiological activity against mold, bacterial bacteria, and other harmful microorganisms in the concrete cross-section restoration material.

Nanometal materials are copper (Cu), silver (Ag), zinc (Zn), aluminum (AI), silicon (Si), titanium (Ti), molybdenum (Mo), nickel formed in a size of several nanometers to hundreds of nanometers. (Ni), germanium (Ge), platinum (Pt), tungsten (W), and oxides of these metals can be selected. Preferably, it may be a metal material having a particle diameter of 1 to 100 nm.

More preferably, it can be selected from copper (Cu), silver (Ag), zinc (Zn), nickel (Ni), germanium (Ge), titanium dioxide (TiO ₂ ) having a particle diameter of 1 to 100 nm, and consider the economic aspect Thus, nano copper or nano germanium may be used.

The content of the nanometallic material is suggested to be 1 to 10 wt%, preferably 3 to 7 wt%. When it was less than 3wt%, the antimicrobial effect was found to be insignificant, and when it was more than 10wt%, the decrease in fluidity and various physical properties such as compressive strength and adhesion strength were significantly decreased.

As an embodiment of the present invention, the admixture included in the cross-section restoration material is included in an amount of 5 to 20 wt%, preferably 8 to 10 wt%, based on the total weight.

The admixture is used to improve long-term durability, and pozzolan and/or flyash may be used. Pojoran, fly ash or slag powder imparts watertightness to the concrete structure, and improves the volume change due to wetting and resistance to freezing and thawing. However, the admixture can be used in an amount of 5 to 20 wt% based on the total weight of the cross-section restoration material, and if more than 20 wt% is used, it causes a decrease in the initial compressive strength, so it is limited to 20 wt% or less.

Meanwhile, the fluidizing agent may be included in an amount of 0.2 to 1.5 wt% based on the weight of the section restoration material, and preferably 0.8 to 1 wt%.

As a high-performance fluidizing agent added to impart workability in the repair method of concrete structures, one or two or more of melamine-based, naphthalene-based, and carboxyl-based fluidizing agents are used in combination. In addition, the high-performance fluidizing agent has no effect of improving fluidity when it is less than 0.2 wt%, and when it is used more than 1.5 wt%, there is no significant effect on improving fluidity, and when using a large amount as an expensive material, the economy is greatly reduced. The content was limited.

The reinforcing material may be a fiber-reinforced composite material selected from polypropylene (PP) fibers, cellulose nano-fibers, cellulose, polyethylene (PE) fibers, and aramid fibers.

Preferably, PP (polypropylene) fibers, cellulose nano-fibers, and cellulose may be mixed in a weight ratio of 1:1:1 or 1:0.5:1.

The reinforcing material may be included in an amount of 0.1 to 1.5 wt% based on the total weight of the section restoration material, and preferably 0.8 to 1 wt%.

The fiber-reinforced composite material can enhance eco-friendly and semi-permanent durability during the concrete section restoration method, prevent corrosion of concrete, and provide fire resistance and waterproof functions, thereby preventing damage from salt damage, chemical corrosion, mold, bacteria, bacteria, and pathogenic microorganisms. You can keep it to a minimum.

The nano-carbon material included in the cross-section restoration material of the present invention may be at least one selected from the group consisting of multi-walled carbon nanotubes, bundle-type carbon nanotubes, carbon nanoplates, plate-shaped graphite, graphene, and graphene oxide. Preferably, the multi-walled carbon nanotubes and the plate-shaped graphite are included in a ratio of 2:1.

The nano carbon material may be included in an amount of 0.01 to 3 wt% based on the weight of the total surface protection material, preferably 0.5 to 2 wt%.

These nano-carbon materials are plate-shaped and maximize the horizontal area, so they can perform superior moisture barrier properties and the function of interfering with the movement of moisture, and increase the tensile strength when combined with the composition of other cross-section restoration materials. Strength and workability can be improved when constructing the section restoration work of concrete structures.

Among the nano carbon materials, carbon nanotubes can be classified into single-walled, double-walled, and multi-walled carbon nanotubes according to the number of walls forming a tube shape. In one embodiment of the present invention, the carbon nanotubes used in the cross-section restoration composition are Using multi-walled carbon nanotubes, the efficiency of the moisture shielding function can also be increased.

In addition, it is possible to increase the moisture barrier power and strength from the nano-carbon material that has expanded the horizontal area by using a bundle-type carbon nanotube or carbon nanoplate. Corrosion can be prevented firmly.

As a preferred embodiment, the nano-carbon material may be composed of a multi-walled carbon nanotube as a main material, and additionally added a material selected from plate-shaped graphite, graphene, and graphene oxide, and the content ratio may be 2:1. .

The diameter of the nano carbon material may be 1 to 50 nm, preferably 1 to 30 nm. When the diameter exceeds 50 nm, there is a problem in that the efficiency of forming the composite particles with the polymer in the coating layer of the cross-section restoration material decreases, and when the length of the nano-carbon material is long, there is a problem that it is difficult to obtain a uniform particle size due to mutual entanglement.

As a preferred embodiment, multi-walled carbon nanotubes, bundle-type carbon nanotubes, carbon nanoplates, plate-shaped graphite, and nano-carbon materials of graphene may be surface-treated to increase dispersibility when forming a composite with a polymer.

In the surface treatment of the nano-carbon material, a carboxy value (-COOH), a hydroxyl group (-OH), or an epoxy group may be introduced to the surface of the nano-carbon material through treatment with an oxidizing agent or an acid.

The acid for the surface treatment may generally be an aqueous inorganic acid solution selected from sulfuric acid, hydrochloric acid, and nitric acid, and hydrogen peroxide may be used as the oxidizing agent.

In addition, in order to improve the dispersibility of the nano-carbon material, ultrasonic waves may be used, but surface treatment using an acid or an oxidizing agent and ultrasonic treatment may be used in parallel.

In the present invention, the nano-carbon material used as a cross-section restoration composition of a concrete structure forms a composite with other materials to increase tensile strength, increase moisture barrier properties, and have long-term heat resistance, so it is repaired after construction of the concrete cross-section restoration construction. It can keep the stability of the old concrete structure high.

In addition, as another embodiment for maximizing the function of the nano-carbon material, the cross-section restoration composition may further include 0.01 to 3 wt% of boron nitride (BN).

Boron nitride, which is a layered graphite, can function to increase moisture barrier power and strength, like a nano carbon material. Boron nitride (BN) may be added in an amount of 0.01 to 3 wt%, preferably, it may be added at a level of 5 to 20% compared to the content of the nano carbon material.

Meanwhile, an anionic or nonionic dispersant may be used in an amount of 0.5 to 3 wt% based on the total weight in the cross-section restoration material according to an embodiment of the present invention.

When the anionic or nonionic dispersant is less than 0.5 wt%, it is difficult to obtain uniform dispersibility of the inorganic material, and when it exceeds 3 wt%, the material may precipitate due to overdispersion.

Hereinafter, a method of repairing a section of a concrete structure using a section repairing material according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. 1 is a simplified schematic diagram of a concrete structure repaired by a concrete structure cross-section recovery method according to an embodiment of the present invention, and FIG. 2 is a flow chart showing a cross-section recovery method of a concrete structure according to an embodiment of the present invention.

That is, FIG. 1 shows a simplified schematic diagram of a concrete structure after completion of the repair work according to FIG. 2, which shows the sequence of the cross-sectional restoration method of the concrete structure according to an embodiment of the present invention.

The method of repairing the section of the concrete structure of FIG. 2 includes a surface treatment step (S1) of removing foreign substances or deteriorated parts from the section portion to be repaired and treating the surface of the concrete structure, and removing foreign substances from the surface-treated concrete structure with high pressure washing water. Washing the deteriorated part cleaning step (S2), applying a surface reinforcing material to the concrete structure from which the foreign substances have been removed (S3), applying a concrete cross-section restoration material on the surface reinforcing material (S4), It consists of a step (S5) of applying a surface protection material on the area to which the end surface restoration material is applied (S5), and a step (S6) of uniformly coating a ceramic coat material after the surface protection material is applied.

Referring to FIG. 1, which shows a simplified schematic diagram of a concrete structure whose cross section was restored and constructed according to the repair method of FIG. 2, a surface reinforcing material 20 is applied and attached to a partially deteriorated part of the concrete structure 10, and It can be seen that the cross-section restoration material 30 composed of the technical features of the present invention is filled, an additional surface protection material 40 is applied thereon, and the ceramic coat material 50 is applied to the uppermost surface to a predetermined thickness and cured. have.

Looking at each step of the concrete structure section restoration method, the surface treatment step (S1) is to remove or expose the covering material from the cross section of the concrete structure caused by aging phenomena such as salt damage, neutralization (carbonization), and chemical corrosion. It handles all the various types of phenomena such as filling and compensating the old aggregate, removing water grime, removing rust-contaminated areas, and removing floating areas and corrosion. As the most important pretreatment step, first, the deteriorated concrete cross-section is completely removed using a tool such as a grinder to planarize the surface and treat it in a dense and dense manner.

Then, the high-pressure cleaning step (S2) is a process of cleaning foreign substances present on the cross-section of the surface-treated concrete structure with high-pressure cleaning water, and a high-pressure cleaning machine of 100 to 150 kg/m ^{2 on} the surface of the deteriorated part with a grinder. Use to thoroughly wash off the foreign material to remove it.

Then, the surface reinforcement application step (S3) is a process of applying the surface reinforcement material to the concrete structure from which the foreign substances have been completely removed.

Apply evenly by impregnating the surface reinforcing material at a level of 0.32 kgf/cm ² as it is using a roller, paint brush or air spray gun. As the surface reinforcing material, a conventional commercially available surface reinforcing material may be used, and a permeable surfactant, a reactive silica, and a silica-based water repellent may be selected and used alone or in combination of two or more.

Next, in the step (S4) of applying the cross-section restoration material, 30 to 40 wt% of general cement or slag cement, 30 to 58 wt% of silica sand, 5 to 10 wt% of expansion material, 1 to 10 wt% of nanometal material, 5 to 20 wt% of admixture , Reinforcing material 0.1 to 1.5 wt%, fluidizing agent 0.2 to 1.5 wt%, at least one selected from the group consisting of multi-walled carbon nanotubes, bundle-type carbon nanotubes, carbon nanoplates, plate-shaped graphite, graphene, graphene oxide A cross-section restoration material composed of a composition ratio of 0.01 to 3 wt% of a nano carbon material and 0.5 to 3 wt% of an anionic or nonionic dispersant is applied. In particular, the nanocarbon material may be a composition including the multi-walled carbon nanotube and the plate-shaped graphite in a ratio of 2:1.

The cross-section restoration material is applied to a thickness of about 1 to 1.5 cm once using a plastering or a roller, etc., which are hand-made, and of course, it can be repeatedly applied several times depending on the damaged thickness of the cross-section. For example, the section thickness of the concrete structure to be restored is 3 cm, and the section restoration material is applied twice in an amount of 66.2 kg/m ² .

As another embodiment, it is important to secure the thickness so that the construction thickness is about 2 mm or more than the surface when applying the section restoration material on the repair target section of the concrete structure. This is because it is the minimum required thickness to treat irregularities and defects on the outermost base surface of the concrete structure.

Next, a surface protection material is applied in step S5. The surface protection material may be a commercially available surface protection material, but a mixture of cement or slug, silica sand, acrylic base polymer, and a surfactant may be used. I can. The surface protection material is directly plastered and applied, but with a thickness of 1.5 mm (2.2 kg/m ² ) when applied once.

The final process is the step of applying the ceramic coat material (S6). Using a roller, a paint brush, or an air spray gun, the ceramic coat material is placed on the top of the surface protection material as it is 0.1 to 0.3 mm (0.44 to 0.46 kg). /m ² ) Apply evenly.

As another embodiment of the present invention, a mixture of acrylic polymers or porous materials may be used together with ceramics to be used as a surface coating material in the final finishing process.

Buildings or bridges constructed by the method of repairing the section of a concrete structure using the composition of the section repairing material of the concrete structure of the present invention have excellent adhesion, air permeability, and hardness, so that the lifespan of the concrete structure can be extended, and mold or pathogenic microorganisms Alternatively, it may have an antibacterial function that prevents the growth activity of bacterial bacteria, etc., and in addition, there is an advantage of reducing construction time due to convenient workability.

As a specific embodiment of the present invention, a cross-section restoration material is applied in 3 mm to the repair target cross-section of a predetermined concrete block using the following component materials and composition ratio, and the concrete cross-section restoration mortar product of a competitor A and a competitor B having the same thickness. The properties were compared with the concrete section recovery mortar product.

(The composition ratio of the section restoration material according to the specific embodiment of the present invention)

35wt% of ordinary cement or slag cement,

35wt% of silica sand,

8wt% of CSA-based expanding material,

7 wt% nano copper powder,

Pozzolan 11wt%,

PP fiber and cellulose mixed reinforcement 1wt%,

1wt% of fluidizing agent

1.5 wt% of a nano carbon material, and

0.5wt% of anionic or nonionic dispersant

For the comparative examples 1 and 2 of each of the examples according to the present invention and other companies A and B, the physical property properties were tested for adhesion strength, compressive strength, flexural strength, length change rate, setting time, and anti-mold test. After that, all the age-related days were tested as 10 days, and the results are shown in the following table.

Test Items unit Property value Examples of the present invention Comparative Example 1 (Company A) Comparative Example 2 (Company B) Adhesion strength kgf/cm ² 17.8 15.4 13.0 Compressive strength kgf/cm ² 423 394 388 Flexural strength kgf/cm ² 75 71 73 Length change rate % 0.012 0.014 0.016 Setting time
(Gilmore Test) Initial decision (min) 180 250 230 Termination (hour:min) 4:20 5:05 4:50 Anti-Mold Test
(Microbial reduction rate) % 97 75 60

As can be seen from the above results, it can be seen that the cross-section restoration composition prepared according to the embodiment of the present invention has similar flexural strength compared to conventional products, but has very excellent effects on adhesion strength and compressive strength. In addition, the cross-sectional part of the concrete structure to which the construction method according to the embodiment of the present invention was applied was somewhat less than that of the other comparative examples, and there was a large difference in effect in the setting time and the anti-fungal test, which proved the excellence.

The above description of the present invention is for illustrative purposes only, and those of ordinary skill in the art to which the present invention pertains will be able to understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as being distributed may also be implemented in a combined form. The terms used in the present invention are only specific implementations. It is used to illustrate an example and is not intended to limit the present invention. In the present invention, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

10: concrete structure
20: surface reinforcement
30: Sectional restoration material
40: surface protection material
50: ceramic coat material

Claims (12)

30 to 40 wt% of ordinary cement or slag cement,
30 to 58 wt% of silica sand,
5 to 10 wt% of the expanding material,
1 to 10 wt% of a nano metal material having a particle diameter of 1 to 100 nm, at least one selected from the group consisting of aluminum (AI), titanium (Ti), molybdenum (Mo), platinum (Pt), tungsten (W), and oxides of these metals ,
5 to 20 wt% of admixture,
0.1 to 1.5 wt% of reinforcement,
0.2 to 1.5 wt% fluidizing agent
0.01 to 3 wt% of at least one nano carbon material selected from the group consisting of carbon nanoplates, plate-shaped graphite, and graphene,
Boron nitride (BN) 0.01 to 3 wt%, and
Concrete cross-section restoration composition comprising 0.5 to 3wt% of anionic or nonionic dispersant. delete The method of claim 1,
The expanding material includes calcium sulfo-aluminate, calcium oxide (Ca0), calcium sulfate (CaSO ₄ ), alumina cement, calcium aluminate hydrate, and calcium sulfo aluminate. Concrete cross-section restoration composition, characterized in that at least one selected from the group consisting of portland cement (portland cement). delete The method of claim 1,
The admixture is a concrete cross-section restoration composition, characterized in that pozzolan and/or flyash. The method of claim 1,
The reinforcing material is a fiber-reinforced composite material selected from the group consisting of PP (polypropylene) fibers, cellulose nano-fibers, cellulose, PE (polyethylene) fibers, and aramid fibers. Concrete section restoration composition. The method of claim 1,
The fluidizing agent is a concrete cross section restoration composition, characterized in that at least one selected from the group consisting of melamine-based, naphthalene-based, and carboxyl-based fluidizing agents. Surface treatment step of removing foreign substances and deteriorated parts of the concrete structure;
A deterioration part washing step of washing foreign substances of the surface-treated concrete structure with high pressure washing water;
A surface reinforcement application step of applying a surface reinforcement to the concrete structure from which the foreign substances have been removed;
30 to 40 wt% of general cement or slag cement, 30 to 58 wt% of silica sand, 5 to 10 wt% of expanding material, aluminum (AI), titanium (Ti), molybdenum (Mo) having a particle diameter of 1 to 100 nm, Platinum (Pt), tungsten (W), and any one or more nano metals selected from the group consisting of oxides of these metals 1 to 10 wt%, admixture 5 to 20 wt%, reinforcing material 0.1 to 1.5 wt%, fluidizing agent 0.2 to 1.5 wt% , Carbon nanoplate, plate-shaped graphite, at least one nano-carbon material selected from the group consisting of graphene 0.01 to 3 wt%, boron nitride (BN) 0.01 to 3 wt%, and anionic or nonionic dispersant 0.5 to 3 wt% Sectional restoration material applying step of applying a concrete section restoration composition comprising;
A surface protection material application step of applying a surface protection material on the area where the end surface restoration material is applied; And
A method for repairing a section of a concrete structure, comprising the step of applying a ceramic coating material uniformly applying the ceramic coating material after the surface protection material is applied. The method of claim 8,
The surface reinforcing material is any one or more selected from the group consisting of a permeable surfactant, a reactive silica, and a silica-based water repellent. delete delete The method of claim 8,
The surface protection material is a method of repairing a section of a concrete structure, characterized in that it contains cement, silica sand, acrylic polymer, and a surfactant.

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