KR102562993B1 - Concrete anti-neutralization agent and concrete anti-neutralization surface treating method using thereof - Google Patents

Abstract

According to the invention, a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:2; 40-80 parts by weight of distilled water, 70-90 parts by weight of 3-methylcyclohexane, 100 parts by weight of a water repellent complex in which a fluorocarbon compound, ethylene vinyl acetate and polytetrafluoroethylene are mixed in a volume ratio of 1:0.8:0.3 -Concrete containing a water-repellent mixture to which 50-70 parts by weight of chlorooctane, 30-50 parts by weight of 2-pentanone, and 10-30 parts by weight of dioctylphthalate are added, and the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1:2 An anti-neutralizing agent is provided.

Description

Concrete anti-neutralization agent and concrete anti-neutralization surface treating method using the same

The present invention is to prevent neutralization of the concrete surface due to frost damage, and more specifically, through excellent permeability and water repellency, a neutralization prevention layer is formed on the concrete base body and protective coating is applied to neutralize the concrete surface, and the life span is shortened due to deterioration and oxidation. It relates to a concrete anti-neutralization agent that can minimize the neutralization of concrete and a surface treatment method to prevent concrete neutralization using the same.

In general, performance deterioration due to deterioration in the durability of concrete structures requires considerable costs for repair/reinforcement, construction and maintenance of bypass roads, etc., and if a collapse occurs, the ripple effect goes beyond the economic and technological level to the country and technicians. It not only provides a factor that promotes anxiety about Korea, but also leads to a weakening of competitiveness and loss of credibility in the international community.

Therefore, the recent domestic construction environment is changing to maintenance and reinforcement of existing facilities rather than new investment, and maintenance and life extension of facilities for efficient management of existing facilities and prevention of overlapping budget investment There has been a recent surge of interest in

Recently, due to the development of construction technology, concrete structures are becoming larger and taller, and there is a growing tendency to emphasize the external appearance, such as harmony with the surrounding environment, along with the function of the concrete structure itself. The surface of concrete structures is easily contaminated by various external factors, and the exterior is damaged or damaged.

Damaged concrete structures must be restored to their original functions by carrying out appropriate repair and reinforcement according to the degree of damage.

Accordingly, the development of repair and reinforcement methods and materials for structures is being actively conducted.

As the maintenance method of the concrete structure as described above, the method of surface painting on the concrete structure is most commonly used to ensure long-term durability, watertightness, and safety due to leaks and cracks of large structures. Resins such as epoxy, urethane, and fluorine resins and cement-based paints are mainly used as repair materials.

However, since most of the repair methods used with conventional materials as described above take measures when the performance degradation phenomenon is in earnest, the repair effect often does not reach the expected value. In particular, in the case of external structures exposed to direct sunlight, the resin system has a high risk of yellowing or dropout, and since it does not penetrate into the concrete matrix, concrete deterioration immediately resumes when the coating agent is removed due to surface lifting or impact. There is a problem.

In addition, the paint used for surface treatment on concrete structures preserves the lifespan of concrete structures and prevents performance degradation, especially neutralization, to maintain long-term adhesion and chemical resistance to concrete. However, since these paints use only resin as an adhesive base and pigments, extenders, or anticorrosives protect the waste, the adhesive strength is weak, and when the resin weathers in the air and moisture penetrates, it is oxidized or damaged. There is a problem of being differentiated and losing the front method function.

In addition, products made of only organic materials have excellent adhesion to the concrete structure, but lack air permeability, and have problems in that they are gradually detached from the surface of the structure over time due to contraction and expansion due to temperature change.

In addition, most of the existing urethane and epoxy-based paints use synthetic resins extracted from petroleum as binder components, and organic solvents from petroleum are used as solvent components, but these components include volatile substances such as phenol, formaldehyde, toluene, and xylene. Since it contains substances, there are various problems such as poor durability and poor adhesion to concrete because organic materials are coated on inorganic substrates.

In addition, most of the conventional concrete neutralization inhibitors are organic resins and inorganic modified silicates, and are designed around the same series of materials, and have poor durability and weather resistance (short lifespan), so they are often re-repaired. . In addition, in the case of organic (oil-based products), if it contains moisture in concrete, repair is impossible, and in the case of inorganic modified silicate, there is a problem in that adhesive strength decreases and whitening occurs.

(Patent Document 0001) Registered Patent No. 10-1215403

(Patent Document 0002) Registered Patent No. 10-0192201

(Patent Document 0003) Registered Patent No. 10-0884015

(Patent Document 0004) Registered Patent No. 10-0949548

Therefore, an object of the present invention is to mix a composition with excellent permeability and a composition with excellent water repellency, penetrate into micropores when applied to concrete, and coat the matrix to prevent moisture from adsorbing to micropores and surfaces of concrete, thereby lowering the moisture content of concrete and neutralizing To provide a concrete neutralization inhibitor capable of increasing the lifespan of concrete and a concrete neutralization prevention surface treatment method using the same.

On the other hand, the object of the present invention is not limited to the purpose mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

According to the invention, a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:2; 40-80 parts by weight of distilled water, 70-90 parts by weight of 3-methylcyclohexane, 100 parts by weight of a water repellent complex in which a fluorocarbon compound, ethylene vinyl acetate and polytetrafluoroethylene are mixed in a volume ratio of 1:0.8:0.3 -Concrete containing a water-repellent mixture to which 50-70 parts by weight of chlorooctane, 30-50 parts by weight of 2-pentanone, and 10-30 parts by weight of dioctylphthalate are added, and the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1:2 An anti-neutralizing agent is provided.

Further, according to the present invention, the concrete surface is cleaned and treated; There is provided a concrete neutralization prevention surface treatment method comprising the step of infiltrating and coating the concrete neutralization inhibitor into the concrete matrix.

Therefore, according to the present invention, a composition with excellent permeability and a composition with excellent water repellency are mixed and penetrated into micropores when applied to concrete and coated on the matrix to prevent moisture from being adsorbed to micropores and surfaces of concrete, thereby lowering the moisture content of concrete and neutralizing can be prevented to increase the life of concrete.

On the other hand, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The concrete neutralization inhibitor according to a preferred embodiment of the present invention is a water repellent composite containing a permeable mixture of sodium silicate and aluminum silicate, a mixture of a fluorocarbon compound, ethylene vinyl acetate and polytetrafluoroethylene, distilled water, 3-methyl Cyclohexane, 1-chlorooctane, 2-pentanone and dioctylphthalate are added to the water-repellent mixture, and the permeable mixture and the water-repellent mixture are mixed in a predetermined volume ratio.

Specifically, the concrete neutralization inhibitor of the present invention is a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:2, and a fluorocarbon compound, ethylene vinyl acetate and polytetrafluoroethylene in a ratio of 1:0.8:0.3 40-80 parts by weight of distilled water, 70-90 parts by weight of 3-methylcyclohexane, 50-70 parts by weight of 1-chlorooctane, 30-50 parts by weight of 2-pentanone and dioctyl in 100 parts by weight of the water repellent complex mixed in a volume ratio It includes a water-repellent mixture to which 10-30 parts by weight of phthalate is added, and the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1:2 to prepare a one-component type.

Sodium silicate, together with aluminum silicate, penetrates into the micropores or matrix of concrete, and the aluminum silicate gels in the pores to modify the concrete and provide an adhesive function to prevent neutralization.

Here, when sodium silicate is mixed with aluminum silicate to form a permeable mixture, it has a volume ratio of 1, and when more than the above volume ratio is added, the adhesive property is strong and hardening occurs near the surface before aluminum silicate penetrates into the micropores. It is preferable to have a limited volume ratio as described above because permeability is rather reduced and physical performance such as adhesiveness is insufficient when less than the volume ratio is added.

Aluminum silicate, together with sodium silicate, is filled in the voids when it penetrates into the micropores or matrix of concrete, and reacts with calcium hydroxide in concrete to provide a function of improving the strength of concrete.

Here, when aluminum silicate is mixed with sodium silicate to form a permeable mixture, it has a volume ratio of 2. If more than the above volume ratio is added, the overall viscosity increases when mixed with water or a liquid composition, and the physical properties are rather deteriorated. , It is preferable to have a limited volume ratio as described above, since the total solid content is small and the performance of penetrating into the micropores or matrix of concrete is reduced when less than the above volume ratio is added.

The fluorocarbon compound provides a function of preventing salt damage and neutralization of concrete through physical properties such as durability, heat resistance, chemical resistance, and UV safety when applied to a concrete matrix or penetrated into micropores, and may have a known configuration.

Here, the fluorocarbon compound has a volume ratio of 1 when mixed with ethylene vinyl acetate and polytetrafluoroethylene to form a water repellent composite. Although it becomes stronger, the micropore permeability of the permeable mixture is lowered, and if less than the above volume ratio is added, the adhesion of the coating film to the concrete surface or micropores is lowered, and the film strength, tensile strength and weather resistance are lowered, so it is preferable to have a limited volume ratio as described above. do.

Ethylene vinyl acetate provides water repellency when penetrating into the concrete matrix or micropores, increases the flexural strength of the coating film, suppresses fracture or peeling of the neutralization prevention layer due to shrinkage of concrete, and improves compressive strength and flexibility.

Here, when ethylene vinyl acetate is mixed with a fluorocarbon compound and polytetrafluoroethylene to form a water repellent composite, it has a volume ratio of 0.8. It is preferable to have a limited volume ratio as described above because the workability is reduced and the neutralization prevention layer is easily broken because the bending strength is not secured when it is added less than the volume ratio.

Polytetrafluoroethylene provides functions such as durability and scratch resistance of the anti-neutralization layer by allowing the anti-neutralization layer to have a predetermined hardness when penetrating into the concrete matrix or micropores.

Here, polytetrafluoroethylene has a volume ratio of 0.3 when mixed with a fluorocarbon compound and ethylene vinyl acetate to produce a water repellent composite. Air pockets are generated due to the lifting phenomenon with the concrete surface, and if less than the above volume ratio is added, the hardness of the anti-neutralization layer becomes too weak and there is a problem that it is easily peeled off due to impact, so it is preferable to have a limited volume ratio as described above.

On the other hand, the water-repellent composite is mixed with other mixtures in an amount of 100 parts by weight when preparing the concrete neutralization inhibitor. If the amount exceeds 100 parts by weight, the reaction rate becomes too fast when mixing the mixtures, resulting in poor agitation and workability. And if it is less than 100 parts by weight, there is a problem that the reaction rate of the mixtures is too slow and the working time increases, so it is good to have a limited weight part as described above.

Distilled water makes the permeable mixture mixed with the water repellent mixture have hydrophilicity so that it rapidly diffuses and penetrates into the matrix or micropores of the concrete, so that stable water repellency and strength are enhanced.

Here, 40-80 parts by weight of distilled water is mixed with respect to 100 parts by weight of the water-repellent complex. If it exceeds 80 parts by weight, the water-repellent mixture becomes diluted and the water-repellent function cannot be secured, and if it is less than 40 parts by weight, permeability Since the mixture does not have hydrophilicity and does not penetrate deeply into the micropores, durability and workability are deteriorated, so it is preferable to have a limited weight part as described above.

In addition, distilled water has a temperature of 60-80 ° C. when mixing the water repellent mixture. When the temperature exceeds 80 ° C., the chain bonds of the water repellent mixtures having water repellent properties are broken, and the water repellent function and adhesive function are lowered. If it is less than , the stirrability of water-repellent mixtures having a predetermined viscosity is lowered and there is a problem in that they do not penetrate into the micropores, so it is preferable to have the above temperature.

3-methylcyclohexane provides functions such as excellent heat resistance and elastic recovery of the coating film by the water repellent mixture when penetrating into the concrete matrix or micropores.

Here, 70-90 parts by weight of 3-methylcyclohexane is mixed with respect to 100 parts by weight of the water repellent complex. If it is less than that, there is a problem that the lifting phenomenon occurs, so it is good to have a limited weight part as described above.

1-Chlorooctane provides excellent bonding properties in the preparation of concrete neutralizers.

Here, 50-70 parts by weight of 1-chlorooctane is mixed with respect to 100 parts by weight of the water repellent composite. When it exceeds 70 parts by weight, the viscosity increases and the permeability of the permeable mixture decreases, and when it is less than 50 parts by weight, It is preferable to have a limited weight part as described above because there is a problem in that the degree of bonding with the matrix of concrete or the inner wall of micropores is reduced and easily removed.

2-Pentanone provides an antioxidant function in the preparation of concrete neutralizers.

Here, 30-50 parts by weight of 2-pentanone is mixed with respect to 100 parts by weight of the water repellent complex. When the amount exceeds 50 parts by weight, the anti-oxidation function of the mixture is improved, but the stability is lowered due to increased fluidity. It is difficult to secure the thickness of the neutralization layer, and if it is less than 30 parts by weight, there is a problem in that the antioxidant properties of the mixtures are greatly reduced and the storage period and usability are reduced due to the shortened shelf life, so it is good to have a limited weight part as described above. .

Dioctylphthalate, as a plasticizer, provides ductility and stability when forming an anti-neutralization layer.

Here, 10-30 parts by weight of dioctylphthalate is mixed with respect to 100 parts by weight of the water-repellent composite. When it exceeds 30 parts by weight, the ductility and stability of the mixtures are lowered and the adhesive function is lowered. In this case, the heat resistance is lowered, so the adhesive function is rather deteriorated in high temperature conditions such as summer, etc., and it is difficult to maintain physical properties due to the material separation phenomenon of the mixtures, and there is a problem in that the function to secure thickness during overcoating is lowered. It is good to have.

On the other hand, in the permeating water repellent mixture of the present invention, the above permeable mixture and the water repellent mixture are mixed in a volume ratio of 1:2.

Here, when the volume ratio of the permeable mixture is added more than the above volume ratio or the volume ratio of the water repellent mixture is added less than the above volume ratio, the sodium ion contained in the sodium silicate of the permeable mixture is smoothly changed to a hydrophilic property that is released by moisture or liquid of the water repellent mixture As a result, sodium silicate reacts with high-viscosity gel-like silica product and reacts quickly with calcium hydroxide in concrete, so that the permeable mixture penetrates only near the surface of the micropores and the water-repellent and waterproof functions by the coating of the water-repellent mixture are not sufficiently secured. There is a problem.

In addition, when the volume ratio of the permeable mixture is added less than the above volume ratio or the volume ratio of the water repellent mixture is added more than the above volume ratio, the sodium ion contained in the sodium silicate of the permeable mixture is easily changed to a hydrophilic property that is released by moisture or liquid of the water repellent mixture As sodium silicate reacts with a gelatinous silica product with low viscosity, it does not easily react with calcium hydroxide when applied to concrete, so it does not crystallize even when it penetrates deeply into micropores. There is a problem that the advantages are not used.

Therefore, it is preferable that the penetrating and water-repellent mixture of the present invention is mixed in a limited volume ratio of 1:2.

Hereinafter, the effect of the concrete neutralization inhibitor according to a preferred embodiment of the present invention will be described through specific examples.

First, a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:1 is prepared.

Then, 30 parts by weight of distilled water, 60 parts by weight of 3-methylcyclohexane, 1-chloro A water-repellent mixture was prepared by adding 40 parts by weight of octane, 20 parts by weight of 2-pentanone and 5 parts by weight of dioctylphthalate.

Thereafter, the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1:1 to prepare a one-component anti-neutralizing agent for concrete.

First, a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:2 is prepared.

Then, 60 parts by weight of distilled water, 80 parts by weight of 3-methylcyclohexane, 1-chloro A water-repellent mixture was prepared by adding 60 parts by weight of octane, 40 parts by weight of 2-pentanone and 20 parts by weight of dioctylphthalate.

Thereafter, the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1:2 to prepare a one-component anti-neutralizing agent for concrete.

First, a permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 2:2 is prepared.

Then, 90 parts by weight of distilled water, 100 parts by weight of 3-methylcyclohexane, 1-chloro A water-repellent mixture was prepared by adding 80 parts by weight of octane, 60 parts by weight of 2-pentanone and 40 parts by weight of dioctylphthalate.

Thereafter, the penetration line mixture and the water repellent mixture are mixed in a volume ratio of 2:1 to prepare a one-component concrete neutralization inhibitor.

On the other hand, in order to evaluate the performance of the concrete neutralization inhibitor of each of the above examples, in accordance with KSF 4922, a test piece was prepared as described above, and then the physical properties were measured by comparing with prototypes A and B, and the results are shown in Table 1 below. shown in

evaluation items Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Penetration (mm) 3-4 5-6 4 to 5 2-3 1~2 adhesion
(N/mm^2) 5.1 5.6 4.9 2.5 2.4 smoothness ○ ◎ ○ △ △ Curing time (hrs) Within 0.5 hours Within 0.2 hours Within 0.3 hours within 7 hours within 6 hours Film thickness measurement
(5 times/10m^2) 1.5 to 2.5 mm
(uneven,
Good) 2mm
(Constant,
very good) 1.7 to 2.3 mm
(uneven,
Good) 1.1 to 2.5 mm
(uneven,
very bad) 1.5 to 3 mm
(uneven
, very bad) amount of application 1kg/m^2 moisture permeability
(g/m^2, day) 0.76 0.56 0.74 5.9 6.3 Chloride ion penetration
resistance 1.25 0.8 1.3 11 9 combined cycle
corrosion resistance
(600hr, %) 1.87 1.3 1.92 5.1 4.9 Excellent:◎ Fair:○ Poor:△

Therefore, as shown in Table 1, the concrete anti-neutralization agent according to a preferred embodiment of the present invention has 2-3 times better concrete penetration and adhesive strength than conventional products on the market, and its curing time is dozens of times faster. The labor cost reduction effect is very large, and the neutralization prevention effect through chloride ion penetration resistance and combined cycle corrosion resistance is excellent, and it is possible to secure excellent coating film thickness and provide thickness uniformity during overlapping construction.

In addition, it has excellent water repellent and waterproof performance, and based on this, it is possible to minimize the occurrence of defects during use and to enable anticorrosion and waterproofing methods with excellent durability.

On the other hand, the concrete neutralization prevention surface treatment method using the concrete neutralization inhibitor according to a preferred embodiment of the present invention is as follows.

First, the concrete surface for applying the concrete neutralization inhibitor is cleaned and treated.

Here, the cleaning of the concrete surface includes removing dust, contaminants, or oil adhering to the concrete surface and smoothing the projections of the surface to be constructed.

Thereafter, concrete neutralization inhibitors corresponding to Examples 1 to 3 are prepared.

Thereafter, the concrete neutralization inhibitor is applied or sprayed on the surface-treated construction surface by an application or spraying means, or is penetrated into micropores and then cured to complete the coating film construction.

Therefore, according to the present invention, when a composition with excellent permeability and a composition with excellent water repellency are mixed and applied to concrete, the penetrating composition penetrates into the micropores. It is possible to increase the lifespan of concrete by lowering the moisture content of concrete and preventing neutralization by preventing adsorption to the micropores and surfaces of the concrete.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art can make various substitutions and modifications within the scope of not departing from the technical spirit or essential characteristics of the present invention. And it will be appreciated that variations are possible and thus may be embodied in other specific forms. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting.

Claims (2)

A permeable mixture in which sodium silicate and aluminum silicate are mixed in a volume ratio of 1:2;
40-80 parts by weight of distilled water, 70-90 parts by weight of 3-methylcyclohexane, 100 parts by weight of a water repellent complex in which a fluorocarbon compound, ethylene vinyl acetate and polytetrafluoroethylene are mixed in a volume ratio of 1:0.8:0.3 - a water-repellent mixture containing 50-70 parts by weight of chlorooctane, 30-50 parts by weight of 2-pentanone and 10-30 parts by weight of dioctylphthalate added;
Concrete neutralization inhibitor, characterized in that the penetrating mixture and the water-repellent mixture are mixed in a volume ratio of 1: 2. the concrete surface is cleaned and treated;
A concrete neutralization prevention surface treatment method comprising the step of infiltrating and coating the concrete matrix with the concrete neutralization inhibitor according to claim 1.