KR100917410B1 - Polymer cement concrete composite, overlaying concrete pavement method, and repairing method for concrete pavement using the concrete composite - Google Patents

Abstract

A composition for polymer cement concrete and a road paving method using the same are provided to improve durability and extend a working time owing to a polymeric binder. A composition for polymer cement concrete is composed of 8-25wt% of cement binder, 30-47wt% of fine aggregate, 20-37wt% of course aggregate, 0.5-5wt% of water and 0.5-5wt% of polymeric binder. The polymeric binder is comprised of 90-99.8wt% of styrene-butadien emulsion, 0.01-5wt% of acrylonitrile-butadiene-styrene emulsion and 0.01-5wt% of polyacrylamide. The cement binder comprises 0.1-8wt% of gypsum and 0.05-2wt% of retarder for preventing the composition from being rapidly hardened by the gypsum.

Description

Polymer cement concrete composite, overlay concrete pavement method, and repairing method for concrete pavement using the concrete composite}

The present invention relates to a polymer cement concrete composition, a large concrete bridge pavement method and a concrete pavement repair method using the same, and more specifically, polymer cement used for road pavement, bridge bridge pavement, road repair work, repair of concrete structures, etc. It relates to a concrete composition, a large concrete bridge pavement method and concrete pavement repair method using the same.

In general, a bridge is a generic term for expensive structures that are installed to pass through the upper part of rivers, coasts, and roads. To form.

Such cross-section pavement is a part that directly transmits the traffic load, and should have a suitable strength and crack resistance, as well as being exposed to moisture, such as rainwater, and is required to have a waterproof performance, in particular the penetration of chloride ions. It is required to have low chlorine ion permeability in order to prevent corrosion of the reinforcing bars.

As such a pavement paving method, a conventional concrete paving method or ascon paving method has been known and widely used.

Among them, the general concrete paving method is a method of finishing general concrete by wrapping it on the upper part of the bridge road surface. The material cost is low and economical, and it is possible to pour simultaneously with the bottom plate of the bridge. Cracks in concrete are easily generated due to vibrations along the passage, and there is a problem in that corrosion of reinforcing bars can easily occur due to penetration of harmful chemicals such as chloride from the top due to high permeability.

Recently, polymer cement concrete with SBR (Styrene-Butadiene Rubber) latex has been developed and used in concrete bridge slabs and bridge slabs.

However, SBR latex-modified concrete has a problem of attaching concrete to a work tool as well as having a problem of attaching it to a work tool after finishing concrete after smoothing the concrete because of the characteristic of SBR latex having a very high viscosity. Since the time is about 30 minutes, the construction problems occur and at the same time, the construction problems such as initial plastic cracking and long-term cracking and the amount of polymer incorporation are inevitably increased.

The present invention has been made to solve the above problems, the object of the present invention is to improve the durability performance by incorporating a generally developed polymer-based binder of SBR latex to smooth the surface of the poured concrete by extending the concrete working time It can improve workability by securing enough finishing work time, and it is possible to express early strength by densifying tissue by incorporating gypsum, and improve cracking, bending, tensile and adhesion strength of concrete by incorporating nylon fiber. The present invention provides a polymer cement concrete composition, a large concrete bridge pavement method and a concrete pavement repair method using the same.

The present invention comprises 8 to 25% by weight cement binder, 30 to 47% by weight fine aggregate, 20 to 37% by weight coarse aggregate, 0.5 to 5% by weight water and 0.5 to 5% by weight polymer binder, the polymer binder Contains 90% to 99.9% by weight of styrene-butadiene emulsion, 0.01% to 5% by weight of acrylonitrile-butadiene-styrene emulsion, and 0.01% to 5% by weight of polyacrylamide, the cement-based binder containing 0.1% to 8% by weight of gypsum and It provides a polymer cement concrete composition containing 0.05 to 2% by weight of a retarder for delaying rapid hardening.

The cement binder is usually 50 to 90% by weight of Portland cement, 0.05 to 20% by weight of silica powder, 0.01 to 20% by weight of glass bubble, 0.1 to 8% by weight of gypsum, 0.01 to 2% by weight of nylon fiber and 0.05 to 2 retardant. It may contain one by weight.

The cement-based binder may further include 0.05 to 1% by weight of a fluidizing agent for reducing the water-cement ratio to improve strength and durability.

In addition, the present invention, the step of chipping to remove the latans and impurities of the concrete structure using at least one selected from a crusher, shot blaster and waterjet, and the step of primer treatment or blooming to the chipped concrete site, and the polymer It provides a concrete bridge pavement method comprising the step of laying on top of the chipped concrete using a cement concrete composition and the step of applying a surface protector or curing agent on top of the laid polymer cement concrete composition.

The step of applying with the surface protector or curing agent, may be to apply on the surface of the polymer cement concrete composition laid using at least one selected from the silicate-based and silane-based penetration type surface protector.

The primer treatment or blooming may be performed on a chipped concrete site using a material including at least one selected from styrene-butadiene emulsion, polyacrylic ester, acryl and ethylene vinyl acetate.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping the concrete structure is deteriorated due to deterioration of the concrete by using at least one selected from a crusher, a shot blaster and a water jet, and the primer treatment on the concrete deteriorated site Or a process of blooming, repairing the cross section of the deteriorated area using the polymer cement concrete composition, and applying the surface protection agent or curing agent on top of the laid polymer cement concrete composition. To provide.

The step of applying with the surface protector or curing agent, may be to apply on the surface of the polymer cement concrete composition laid using at least one selected from the silicate-based and silane-based penetration type surface protector.

The primer treatment or blooming may be performed by applying a material including at least one selected from styrene-butadiene emulsion, polyacrylic ester, acryl, and ethylene vinyl acetate to the deteriorated concrete.

According to the polymer cement concrete composition according to the present invention, by using an ABS emulsion and a polymer binder mixed with a polyacrylamide and an SB emulsion, the concrete working time is extended to smooth the surface finish of the poured concrete and at the same time improve the workability and The strength and durability of the concrete is improved.

In addition, by mixing gypsum, the structure can be made compact, and early strength can be expressed in the polymer cement concrete composition.

In addition, by incorporation of the nylon fiber can improve the cracking, bending, tensile and adhesion strength of the concrete.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the following embodiments are provided to those skilled in the art to fully understand the present invention, and may be modified in various forms, and the scope of the present invention is limited to the embodiments described below. It doesn't happen.

Polymer cement concrete composition according to a preferred embodiment of the present invention is 8 to 25% by weight cement-based binder, 30 to 47% by weight fine aggregate, 20 to 37% by weight coarse aggregate, 0.5 to 5% by weight water and 0.5 to 5% by weight polymer-based binder Contains%

The cement-based binder usually contains a retarder for delaying rapid hardening by portland cement, silica powder, glass bubbles, gypsum, nylon fibers and gypsum. The cement binder is usually 50 to 90% by weight of Portland cement, 0.05 to 20% by weight of silica powder, 0.01 to 20% by weight of glass bubble, 0.1 to 8% by weight of gypsum, 0.01 to 2% by weight of nylon fiber and 0.05 to 2 retardant. It is preferable that weight% is mixed. In addition, the cement-based binder may further comprise 0.05 to 1% by weight of a fluidizing agent for improving the strength and durability by reducing the water-cement ratio.

In addition, the polymeric binder may be a styrene-butadiene (hereinafter referred to as 'SB') emulsion, an acrylonitrile-butadiene-styrene (hereinafter referred to as 'ABS') emulsion and a polyacrylamide Is preferably mixed.

In the polymer cement concrete composition according to a preferred embodiment of the present invention, the cement binder is 8-25 wt%, fine aggregate 30-47 wt%, coarse aggregate 20-37 wt% after stirring in a forced mixer, water 0.5-5 wt% And 0.5 to 5% by weight of the polymer binder can be mixed and prepared by stirring for 2-3 minutes.

Hereinafter, a preferred embodiment of the polymer cement concrete composition according to the present invention will be described in detail.

The polymer cement concrete composition according to the present invention contains 8 to 25 wt% of the cement binder, 30 to 47 wt% of fine aggregate, 20 to 37 wt% of coarse aggregate, 0.5 to 5 wt% of water, and 0.5 to 5 wt% of the polymer binder. do.

Aggregates are divided into fine aggregates and coarse aggregates, and those having a particle diameter of 5 mm or less are called fine aggregates, and those having a particle size larger than 5 mm are classified as coarse aggregates. It is preferable that 30-47 weight% of fine aggregates are contained with respect to the whole polymer cement concrete composition, and it is preferable that coarse aggregates are 20-37 weight% with respect to the whole polymer cement concrete composition.

The polymer-based binder is used to improve the curing time, workability and ductility of concrete, and is preferably a polymer mixed with an SB emulsion, an ABS emulsion, and a polyacrylamide. When only the SB emulsion is used as the polymer-based binder, since the viscosity of the concrete decreases and irregularities occur in the concrete surface during finishing, the ABS emulsion and the polyacrylamide are mixed to prevent this.

Polyacrylamide is able to form a stable concrete structure by providing fluidity, cohesion and material separation prevention, and additionally, it has side effects such as preventing water contamination by excellent cohesion and protecting steel reinforcement of the structure. have.

The addition of ABS emulsion to the polymeric binder improves adhesion and flexural toughness with existing concrete surfaces.

The mixing ratio of the SB emulsion, the ABS emulsion, and the polyacrylamide is preferably in the range of 90 to 99.9 wt% of the SB emulsion, 0.01 to 5 wt% of the ABS emulsion, and 0.01 to 5 wt% of the polyacrylamide with respect to 100 wt% of the polymeric binder. When the total content of the ABS emulsion and the polyacrylamide exceeds 10% by weight, the workability of the concrete is improved, but the stability is lowered and the initial strength of the concrete is lowered, and when it is less than 0.02% by weight, the flexural toughness and durability are lowered.

The polymer-based binder is preferably contained 0.5 to 5% by weight based on the polymer cement concrete composition. When the content of the polymer-based binder exceeds 5% by weight, the viscosity of the concrete is lowered, so that the material is easily separated, and the hydration reaction is delayed to lower the early compressive strength and lower the price competitiveness. And when the content of the polymer-based binder is less than 0.01% by weight, the durability of the concrete is lowered.

The cement binder is usually 50 to 90% by weight of Portland cement, 0.05 to 20% by weight of silica powder, 0.01 to 20% by weight of glass bubble powder, 0.1 to 8% by weight of gypsum, 0.01 to 2.0% by weight of nylon fiber and 0.05 to 2 retardant. It can be used in the weight% range.

It is preferable to use the ordinary portland cement as defined in KS.

The silica powder and glass bubble are used to enhance latent hydraulic properties, long-term strength and durability. When the weight ratio of silica powder and glass bubble increases, the initial strength decreases, but long-term strength expression and durability increase.

The nylon fiber is used to improve the crack, flexural toughness and adhesive strength of concrete. The nylon fiber is a reinforcing fiber for concrete made of nylon 6, nylon 66, etc. as a raw material, and improves physical properties and durability of concrete as well as reducing plastic shrinkage cracking. In addition, it has hydrophilicity and is excellent in adhesion to paste, and has excellent surface finishing and dispersing properties. Nylon fiber has a partial negative charge to N or O in the molecule, and thus has an advantage of improving the bonding strength with cement paste by electrostatically interacting with H of the water molecule having the partial positive charge. Geotextiles for improving the performance of concrete include glass fibers, vinyl fibers, polyvinyl alcohol fibers, etc., it is preferable to use nylon fibers.

The gypsum is used for early strength development. Gypsum may use anhydrous gypsum or dihydrate gypsum. If the content of gypsum is increased, it shows fast curing property. If the content is less than 0.1% by weight, the early strength improvement effect of the concrete composition is weak, and if it is more than 8% by weight, good properties can be obtained due to the fast curing property. It is not economic because of high cost.

The retardant may be used to delay the rapid hardening by gypsum to secure workability for a certain time. The retarder is preferably added 0.05 to 2% by weight based on 100% by weight of the cement binder. As the retarder, generally well-known substances can be used, for example, sugars such as glucose, glucose, textine, dextran, gluconic acid, malic acid, citric acid, citric acid or salts thereof, aminocarboxylic acids Or salts thereof, phosphonic acids or derivatives thereof, polyhydric alcohols such as glycerin, and the like.

The glidant is used to improve the strength and durability by reducing the water-cement ratio of the composition. The fluidizing agent may be a polycarboxylic acid-based, melamine-based or naphthalene-based fluidizing agent. Melamine-based or naphthalene-based fluidizing agents have a slight improvement in strength and durability compared to polycarboxylic acid-based fluidizing agents, have no significant effect of reducing water-cement ratio, and foaming when mixed with SB emulsions added as a polymeric binder. There is a disadvantage that the miscibility occurs. Therefore, it is preferable to use a polycarboxylic acid type fluidizing agent, and it is preferable to add 0.05-1 weight% with respect to 100 weight% of cement type binders.

In addition, the present invention, the step of chipping (Chipping) to remove the latency and impurities of the concrete structure using at least one selected from a crusher, a shot blaster and a waterjet, and the primer treatment or blooming to the chipped concrete site And, using a polymer cement concrete composition to provide a chipping concrete on the top and provides a concrete bridge paving method comprising the step of applying a surface protector or curing agent on top of the polymer cement concrete composition.

The primer treatment is carried out to facilitate attachment of the polymer cement concrete composition to the chipped concrete site, and means a process of applying (or coating) the primer to the chipped concrete site. The primer may be at least one selected from SB emulsion, poly acryl ester (PAE), acrylic, and ethylene vinyl acetate (EVA), which facilitates adhesion of the polymer cement concrete composition to a concrete structure. have. In this case, the solid content of the primer should be lowered to about 13% by weight, and when used in excess of 13% by weight, the thickness of the coating may be thickened, thereby lowering the adhesion performance.

The blooming is performed to facilitate the adhesion of the polymer cement concrete composition to the chipped concrete site, and means a process of applying mortar to the chipped concrete site. The mortar is preferably a mortar containing at least one selected from SB emulsion, poly acryl ester (PAE), acryl and ethylene vinyl acetate (EVA).

The step of laying on the chipped concrete using the polymer cement concrete composition may be carried out by chipping the polymer cement concrete composition according to a preferred embodiment of the present invention on a cross section subjected to primer treatment or blooming using a mobile mixer or edge data. This can be done by laying on top of concrete. Using the mobile mixer or the edge data, cement-based binder, fine aggregate, coarse aggregate, water, waterproof agent and polymer-based binder are mixed to prepare a polymer cement concrete composition according to the preferred embodiment of the present invention, and the polymer cement concrete composition It can be applied by continuously discharging a predetermined amount. The polymer cement concrete composition is installed in a predetermined thickness on the chipped concrete, and finished by vibrating compaction using a concrete vibrator. Forming a tining groove having a predetermined distance (for example, 3 to 5 cm) and a predetermined depth (4 to 6 mm) using a tinning machine to generate frictional force against the tire of the vehicle to prevent the vehicle from slipping It may further include.

When the polymer cement concrete composition is applied, the surface protection agent or curing agent is applied to perform curing of the concrete. Curing of the concrete is different depending on the amount of laying of the polymer cement concrete composition, the weather, etc. In general, it is preferable to perform wet curing for 48 to 72 hours and dry curing for 3 to 10 days. The surface protecting agent may use at least one selected from silicate-based penetrant surface protector and silane-based penetrant surface protector.

In addition, the present invention, the step of removing the impurities and deterioration site by chipping (chipping) the concrete structure is deteriorated due to deterioration of the concrete using a crusher, shot blaster, waterjet, and the like, primer treatment Or performing a blooming step, restoring a cross section of the deteriorated area using the polymer cement concrete composition, and applying the laid polymer cement concrete composition with a surface protector or curing agent. To provide. Hereinafter, the concrete pavement repair method is used to include a repair method used for repairing road pavement of roads, repair of bridge bridge pavement, road repair, repair of concrete structures, and the like.

The primer treatment is carried out to facilitate the adhesion of the polymer cement concrete composition to the deteriorated portion of the concrete, and means a process of applying (or coating) the primer to the deteriorated portion of the concrete. The primer may be at least one selected from SB emulsion, poly acryl ester (PAE), acrylic, and ethylene vinyl acetate (EVA), which facilitates adhesion of the polymer cement concrete composition to a concrete structure. have. In this case, the solid content of the primer should be lowered to about 13% by weight, and when used in excess of 13% by weight, the thickness of the coating may be thickened, thereby lowering the adhesion performance.

The blooming is carried out to facilitate the adhesion of the polymer cement concrete composition to the deteriorated portion of the concrete, and means a process of applying mortar to the deteriorated portion of the concrete. The mortar is preferably a mortar containing at least one selected from SB emulsion, poly acryl ester (PAE), acryl and ethylene vinyl acetate (EVA).

The step of recovering the cross section of the deteriorated portion by using the polymer cement concrete composition may be carried out by laying the polymer cement concrete composition according to a preferred embodiment of the present invention on a cross section subjected to primer treatment or blooming by using a mobile mixer or edge data. It can be made to recover the cross section of the affected area. Using the mobile mixer or the edge data, cement-based binder, fine aggregate, coarse aggregate, water, waterproof agent and polymer-based binder are mixed to prepare a polymer cement concrete composition according to a preferred embodiment of the present invention, and the polymer cement concrete composition It can be applied by continuously discharging a predetermined amount. The polymer cement concrete composition is installed in a predetermined thickness in consideration of the thickness of the deteriorated portion, and finished by vibrating compaction using a concrete vibrator. Forming a tining groove having a predetermined distance (for example, 3 to 5 cm) and a predetermined depth (4 to 6 mm) using a tinning machine to generate frictional force against the tire of the vehicle to prevent the vehicle from slipping It may further include.

When the polymer cement concrete composition is applied, the surface protection agent or curing agent is applied to perform curing of the concrete. Curing of the concrete is different depending on the amount of laying of the polymer cement concrete composition, the weather, etc. In general, it is preferable to perform wet curing for 48 to 72 hours and dry curing for 3 to 10 days. The surface protecting agent may use at least one selected from silicate-based penetrant surface protector and silane-based penetrant surface protector.

Examples of the polymer cement concrete composition according to the present invention as described above in more detail, the present invention is not limited by the following examples.

<Example 1>

17% by weight cement-based binder, 43% by weight aggregate, 35% by weight coarse aggregate were added to a forced mixer and stirred, followed by further mixing 2% by weight of water and 3% by weight of polymer-based binder, followed by stirring for 2 minutes. Was prepared.

At this time, the cement-based binder is usually 87% by weight of Portland cement, 8% by weight of silica powder, 2% by weight of glass bubble powder, gypsum, 1% by weight, 1% by weight of nylon fiber, 0.5% by weight of retardant and 0.5% by weight of a fluidizing agent. Used. The polymer binder was SB emulsion. Citric acid was used as the retardant. As the fluidizing agent, a polycarboxylic acid-based fluidizing agent was used.

<Example 2>

17% by weight cement-based binder, 43% by weight aggregate, 35% by weight coarse aggregate were added to a forced mixer and stirred, followed by further mixing 2% by weight of water and 3% by weight of polymer-based binder, followed by stirring for 2 minutes. Was prepared.

At this time, the cement-based binder is usually 87% by weight of Portland cement, 8% by weight of silica powder, 2% by weight of glass bubble powder, gypsum, 1% by weight, 1% by weight of nylon fiber, 0.5% by weight of retardant and 0.5% by weight of a fluidizing agent. Used. The polymer binder was used by mixing 97% by weight of the SB emulsion, 0.5% by weight of the ABS emulsion and 2.5% by weight of the polyacrylamide. Citric acid was used as the retardant. As the fluidizing agent, a polycarboxylic acid-based fluidizing agent was used.

<Example 3>

17% by weight cement-based binder, 43% by weight aggregate, 35% by weight coarse aggregate were added to a forced mixer and stirred, followed by further mixing 2% by weight of water and 3% by weight of polymer-based binder, followed by stirring for 2 minutes. Was prepared.

At this time, the cement-based binder is usually 87% by weight of Portland cement, 8% by weight of silica powder, 2% by weight of glass bubble powder, gypsum, 1% by weight, 1% by weight of nylon fiber, 0.5% by weight of retardant and 0.5% by weight of a fluidizing agent. Used. The polymer binder was used by mixing 97% by weight of SB emulsion, 2.5% by weight of ABS emulsion and 0.5% by weight of polyacrylamide. Citric acid was used as the retardant. As the fluidizing agent, a polycarboxylic acid-based fluidizing agent was used.

In order to more easily understand the characteristics of Examples 1 to 3 above, comparative examples that can be compared with the embodiments of the present invention are presented, and Comparative Examples 1 and 2, which will be described later, are commonly used cements. Concrete compositions and polymer cement concrete compositions are presented.

Comparative Example 1

Usually, 17 wt% of Portland cement, 43 wt% of fine aggregate, and 35 wt% of coarse aggregate were added to a forced mixer and stirred, and then 5 wt% of water was further mixed and stirred with a forced mixer to prepare a normal cement concrete composition.

Comparative Example 2

Usually, 17% by weight of Portland cement, 43% by weight of fine aggregate, and 35% by weight of coarse aggregate are added to a forced mixer, followed by stirring, followed by further mixing 2% by weight of water and 3% by weight of SB emulsion, followed by stirring for 2 minutes. Was prepared.

The following test examples show the experimental results comparing the characteristics of the examples according to the invention with the characteristics of Comparative Examples 1 and 2 to more easily understand the characteristics of Examples 1 to 3 according to the present invention .

<Test Example 1>

The slump test (degree of kneading) of the polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 was carried out according to the method specified in KS F 2402. The slump test is to test the toughness of the dough, such as the age and consistency of the concrete, the higher the value means the workability (workability), that is, the excellent workability when pouring concrete.

Table 1 below shows the change of slump over time.

division Slump (cm) Immediately after stirring After 20 minutes After 30 minutes After 40 minutes After 60 minutes Example 1 20 15 12 10 8 Example 2 19 18 15 13 10 Example 3 20 19 17 15 14 Comparative Example 1 18 10 5 2 0 Comparative Example 2 19 12 8 7 4

As shown in Table 1, Examples 1 to 3 are superior in workability compared to Comparative Examples 1 and 2, and in particular, Example 3 does not have a large change in slump over time, resulting in workability. It is very good.

<Test Example 2>

The polymer cement concrete compositions according to Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were subjected to a compressive strength test according to the method specified in KS F 2405.

Table 2 below shows the change in compressive strength over time.

division Compressive strength (㎏f / ㎠) 3 days later 7 days later 14 days later 28 days later Example 1 185 234 377 468 Example 2 198 248 408 498 Example 3 202 265 432 528 Comparative Example 1 176 215 353 408 Comparative Example 2 178 220 358 412

As shown in Table 2, Examples 1 to 3 were significantly hardened after the complete curing, compared to Comparative Example 1 and Comparative Example 2.

<Test Example 3>

The flexural strength of the polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were measured according to the method specified in KS F 2408.

Table 3 below shows the change in flexural strength over time.

division Flexural strength (㎏f / ㎠) 3 days later 7 days later 14 days later 28 days later Example 1 30 46 61 78 Example 2 35 51 68 96 Example 3 37 58 78 105 Comparative Example 1 23 32 45 51 Comparative Example 2 28 44 59 76

As shown in Table 3 above, Examples 1 to 3 is cured after 7 days of construction, the resistance to the external load is generated so that the deformation of the concrete does not occur. In particular, after 28 days of fully cured concrete, Examples 1 to 3 were much higher in flexural strength than Comparative Examples 1 and 2.

<Test Example 4>

Drying shrinkage of the polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were measured by KS F 2424 (Test method for changing the length of concrete). It is shown in Table 4 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Dry Shrinkage (× 10 ^-4 ) 1.2 1.0 1.0 4.0 1.5

As shown in Table 4, Examples 1 to 3 it was confirmed that the amount of dry shrinkage is reduced compared to Comparative Example 1 and Comparative Example 2 has a shrinkage reducing effect.

<Test Example 5>

Table 5 shows the results of measuring the water absorption of the polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 according to the method specified in KS F 4004. If the absorption rate is high, impurities or water penetrate into the interior of the concrete, which increases the porosity in the interior of the concrete, causing problems in the structure.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Absorption rate (%) 1.5 1.4 1.2 6.9 1.9

As shown in Table 5, Examples 1 to 3 has a lower water absorption than Comparative Example 1 and Comparative Example 2.

<Test Example 6>

The polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were subjected to a penetration depth test of chloride ions according to JIS A 1171 (Test Method of Polymer Cement Mortar). The results are shown in Table 6.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Chloride ion penetration depth (mm) 1.6 1.4 1.2 6.7 1.9

As shown in Table 6, Examples 1 to 3 has a small chloride ion penetration depth compared to Comparative Example 1 and Comparative Example 2, it was confirmed that the high resistance to salt.

<Test Example 7>

The polymer cement concrete compositions of Examples 1 to 3 described above and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were subjected to a neutralization depth test according to JIS A 1171 (Test Method of Polymer Cement Mortar). The results are shown in Table 7.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Neutralization Depth (mm) 1.1 1.0 0.8 3.0 1.3

As shown in Table 7, Example 1 to Example 3 was found to have a lower neutralization penetration depth than Comparative Example 1 and Comparative Example 2, it was confirmed that the high resistance to neutralization.

<Test Example 8>

The freeze-thaw resistance test was performed on the polymer cement concrete compositions of Examples 1 to 3 and the cement concrete compositions prepared by Comparative Examples 1 and 2 according to the method specified in KS F 2456. Freeze thaw refers to the freezing and melting of the moisture absorbed by the concrete, and when the freeze thaw is repeated, fine cracks are generated in the concrete structure, resulting in a problem of deterioration in durability.

Table 8 shows the durability index of each of the Examples and Comparative Examples according to the freeze thaw resistance test.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Durability index 91 93 95 50 90

As shown in Table 8, Examples 1 to 3 is significantly higher durability index than Comparative Examples 1 and 2, it can be seen that the durability is improved.

As mentioned above, although preferred embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various deformation | transformation by a person of ordinary skill in the art within the scope of the technical idea of this invention is carried out. This is possible.

Claims (9)

8 to 25 wt% of cement binder, 30 to 47 wt% of fine aggregate, 20 to 37 wt% of coarse aggregate, 0.5 to 5 wt% of water and 0.5 to 5 wt% of polymer binder, wherein the polymer binder is styrene-butadiene Emulsion 90 to 99.9% by weight, acrylonitrile-butadiene-styrene emulsion and 0.01 to 5% by weight of polyacrylamide, the cement-based binder is cured rapidly by 0.1 to 8% by weight gypsum and gypsum A polymer cement concrete composition comprising from 0.05 to 2% by weight of a retarder for delaying the retardation. The method of claim 1, wherein the cement-based binder, Usually contains 50 to 90% by weight of Portland cement, 0.05 to 20% by weight of silica powder, 0.01 to 20% by weight of glass bubble, 0.1 to 8% by weight of gypsum, 0.01 to 2% by weight of nylon fiber and 0.05 to 2% by weight of retardant. Polymer cement concrete composition, characterized in that. The method of claim 1, wherein the cement-based binder, Polymeric cement concrete composition, characterized in that it further comprises 0.05 to 1% by weight of a fluidizing agent for reducing the water-cement ratio to improve strength and durability. Chipping and removing the latans and impurities of the concrete structure using at least one selected from a crusher, a shot blaster, and a water jet; Priming or blooming the chipped concrete site; Laying on top of the chipped concrete using the polymer cement concrete composition of claim 1; And Concrete bridge pavement method using the polymer cement concrete composition according to claim 1 comprising the step of applying a surface protector or curing agent on top of the laid polymer cement concrete composition. The method of claim 4, wherein applying the surface protector or curing agent comprises: A concrete bridge pavement method using the polymer cement concrete composition according to claim 1, wherein the polymer cement concrete composition according to claim 1 is applied to the upper surface of the polymer cement concrete composition which has been deposited using at least one selected from a silicate-based and silane-based penetration type surface protecting agent. The method of claim 4, wherein the primer treatment or blooming is performed. Concrete cross section using the polymer cement concrete composition according to claim 1, which is applied to the chipped concrete site using a material comprising at least one selected from styrene-butadiene emulsion, polyacrylic ester, acryl and ethylene vinyl acetate. Packaging method. Deteriorating the concrete structure and chipping the site where the concrete is dropped by using at least one selected from a crusher, a shot blaster, and a water jet to remove impurities and deterioration sites; Priming or blooming the concrete deteriorated area; Recovering a cross section of the degraded site using the polymer cement concrete composition of claim 1; And Concrete pavement repair method using the polymer cement concrete composition according to claim 1, comprising the step of applying a surface protector or curing agent on top of the laid polymer cement concrete composition. The method of claim 7, wherein the applying with the surface protector or curing agent, A concrete pavement repair method using the polymer cement concrete composition according to claim 1, which is applied to the upper surface of the polymer cement concrete composition which has been deposited using at least one selected from a silicate-based and silane-based penetration type surface protecting agent. The method of claim 7, wherein the primer treatment or blooming step, Concrete using the polymer cement concrete composition according to claim 1, which is applied to the deteriorated concrete using a material comprising at least one selected from styrene-butadiene emulsion, polyacrylic ester, acryl and ethylene vinyl acetate. Packaging repair method.