KR101676296B1 - High early strength concrete composition modified with nano hardend silica and phenylethene-ethyl propenoate polymer synthetic latex, and repairing method for concrete pavement using the same - Google Patents

Abstract

The present invention relates to a crude steel concrete composition modified with phenylethene-ethyl propenoate based polymer latex and a method for repairing concrete pavement using the same, which comprises 10-30 parts by weight of crude steel cement binder, 25-60 parts by weight of fine aggregate, -10 parts by weight of water, and 1-15 parts by weight of a phenylethene-ethyl propenoate-based polymer synthetic latex in order to improve the adhesive strength, water resistance and durability of the concrete, and the phenylethene-ethyl The propylene glycol-based polymer latex comprises 30-40 parts by weight of phenylethene, 30-40 parts by weight of ethyl-propenoate, 1-20 parts by weight of butyl-pro-2-enoate, 10 parts by weight of propyl-2-enoic acid, 1-10 parts by weight of pro-2-enoic acid and 1-10 parts by weight of dimethylammonoethylmethyl acrylate, and Use this It relates to concrete pavement repair method. The crude steel concrete composition modified with the phenylethene-ethylpropenoidate polymer latex of the present invention was terminated within 3 hours after the concrete was laid and started to exhibit strength, and a compressive strength of 21PMa or more was exhibited at 24 hours of curing, Opening reduces the social overhead cost due to the opening of early traffic, and also improves the waterproofness and durability of the concrete, thereby reducing the slab neutralization and reducing the long term maintenance cost due to the extension of the life of the concrete pavement.

Description

Technical Field [0001] The present invention relates to a crude steel concrete composition modified with nano hard silica and phenylethene-ethyl propenoate polymer latex, and a concrete repair method using the same. method for concrete pavement using the same}

The present invention relates to a cement concrete composition and a maintenance method for a concrete structure using the cement concrete composition. More particularly, the present invention relates to a polymer modified crude steel cement concrete composition for use in roadside road pavement, bridge bridge pavement, And a maintenance method of a concrete structure using the same.

Generally, concrete pavement is applied to highway and national highway because it has better durability and less maintenance cost than asphalt pavement. However, concrete pavement cracked or partially fractured due to shrinkage and relaxation repetition depending on climate change, neutralization of concrete surface and interior due to chloride spraying during the winter, and cumulative fatigue damage due to increase of traffic volume.

In order to solve the above problems, the use of latex modified concrete in which styrene-butadiene rubber (SBR) latex is added to concrete repair and reinforcement work is described in Korean Patent Registration No. 421255.

In the case of using SBR latex for the production of reformed crude steel concrete by the above-mentioned description, it has been found that, in the winter season, the chloride penetration resistance or the freezing and thawing stability deteriorates and the surface detachment, partial damage and detachment of the latex modified concrete, Cracks due to relaxation stress occurred.

The present inventors have developed a crude steel concrete composition modified with a polymeric latex of phenylethene-ethyl propenoate polymer. The crude steel concrete composition is terminated within 3 hours after the concrete is poured, The present invention has been accomplished by confirming that compressive strength of 21PMa or more is exhibited and waterproofness and durability of concrete are improved to suppress the slab neutralization and to prolong the life of the concrete pavement.

It is an object of the present invention to provide a crude steel concrete composition modified with a polymeric synthetic latex of phenylethene-ethylpropenoidate, which is superior in water resistance and freeze-thaw stability to SBR latex modified concrete.

It is still another object of the present invention to provide a latex modified crude steel concrete composition comprising the latex modified crude steel concrete composition using the excellent adhesive force, chloride penetration resistance and freeze / thaw stability of the crude steel concrete composition modified with the phenylethene-ethylpropenoidate polymer latex A polymer capable of improving the physical properties such as compressive strength and bond strength and improving the durability such as chloride penetration resistance and freezing and thawing resistance than the existing SBR latex modified crude steel concrete composition even under the condition of reducing the amount of polymer used The present invention also provides a method for repairing concrete pavement using the crude steel concrete composition modified with latex.

In order to achieve the above object, the present invention provides a cementitious cement mortar composition comprising 1-30 parts by weight of crude steel cement binder, 25-60 parts by weight of fine aggregate, 25-60 parts by weight of coarse aggregate, 1-10 parts by weight of water, Ethyl propenoate based polymer latex comprising 1-15 parts by weight of a polypropylene glycol-based polymer latex.

The present invention also relates to a method of manufacturing a semiconductor device, comprising the steps of: 1) confirming a degradation site and a degree of deterioration of a packaging layer; 2) removing the deteriorated portion or the damaged portion using a crusher to expose the dry portion; 3) removing foreign substances and undamaged damage areas by using a cutting or punching machine to clean the exposed surface of the dry skin with high pressure water; 4) covering the cleaned dry part with a polyethylene film or a film equivalent thereto to make the entire part dry in a saturated state; 5) producing the crude steel concrete composition modified with the prepared phenylethene-ethyl propenoate based polymer synthetic latex and casting it on the cutting surface; 6) planarizing the surface of the remodeled concrete using a deck fin and a screed; And 7) a step of spraying an oil-based curing agent on the surface of the repaired concrete to form a coating, and a method of repairing concrete pavement using the crude steel concrete composition modified with the polymeric synthetic latex of phenylethene-ethyl propenoate polymer do.

Hereinafter, the present invention will be described in detail.

The present invention relates to a cementitious mortar composition comprising 1-30 parts by weight of crude steel cement binder, 25-60 parts by weight of fine aggregate, 25-60 parts by weight of coarse aggregate, 1-10 parts by weight of water, Ethyl propenoate based polymer latex comprising 1-15 parts by weight of a polymer synthetic latex.

In the crude steel concrete composition modified with the phenylethene-ethylpropenoidate-based polymer synthetic latex of the present invention, the phenylethene-ethylpropenoidate-based polymer latex comprises 30 to 40 parts by weight of phenylethene, Phenoate, 1-20 parts by weight of butyl-prop-2-enoate, 1-10 parts by weight of 2-propenenitrile, 1-10 parts by weight of pro-2-enoic acid, And 1-10 parts by weight of methyl acrylate.

Also, in the crude steel concrete composition modified with the phenylethene-ethyl propenoate polymer latex according to the present invention, the crude steel cement binder may comprise 50-90 parts by weight of crude steel cement, 1-20 parts by weight of a glass anhydrite (CaSO ₄ ) 1-20 parts by weight of glass lime (CaO), 1-10 parts by weight of hauyne, 1-5 parts by weight of hard silica, and 0.01-1.0 parts by weight of polyethylene oxide, It is more preferred that the binder further comprises 0.1-0.2 parts by weight of amorphous precipitated silica or 0.01-1.0 parts by weight of a polyethylene oxide having a molecular weight of 300,000-500,000.

The present invention also relates to a method of manufacturing a semiconductor device, comprising the steps of: 1) confirming a degradation site and a degree of deterioration of a packaging layer; 2) removing the deteriorated portion or the damaged portion using a crusher to expose the dry portion; 3) removing foreign substances and undamaged damage areas by using a cutting or punching machine to clean the exposed surface of the dry skin with high pressure water; 4) covering the cleaned dry part with a polyethylene film or a film equivalent thereto to make the entire part dry in a saturated state; 5) producing the crude steel concrete composition modified with the prepared phenylethene-ethyl propenoate based polymer synthetic latex and casting it on the cutting surface; 6) planarizing the surface of the remodeled concrete using a deck fin and a screed; And 7) a step of spraying an oil-based curing agent on the surface of the repaired concrete to form a coating, and a method of repairing concrete pavement using the crude steel concrete composition modified with the polymeric synthetic latex of phenylethene-ethyl propenoate polymer do.

In the method of repairing concrete pavement using the crude steel concrete composition modified with phenylethyne-ethylpropenoate polymer latex of the present invention, the degradation site and deterioration degree of the pavement layer in the step 1) It can be done through nondestructive strength test.

The step of removing the deteriorated portion or the damaged portion in the step 2) by using a crusher to expose the dry portion may be performed by using equipment such as a road surface crusher, a high pressure water crusher (water jet), a skid loader, a breaker, a grinder, The existing deteriorated portion or the removed portion can be removed.

In addition, the surface of the deteriorated portion can be vibrated by suction of the surface foreign material and the concrete remnants by a vacuum suction device. In addition, the polymer-modified concrete composition is laid out using equipments such as a paving equipment (deck finishing machine, screed) for bridge pavement, and the cutting section is restored by a planarizing operation, and the surface of the laid polymer- Can be applied.

The crude steel concrete modified with the phenylethyne-ethylpropenoate polymer latex modified according to the present invention having the above structure can be obtained by mixing (phenylethene) - (ethyl-propenoate) - (butyl-pro-2-enoate ) - (2-propenenitrile) - (pro-2-enoic acid) - (dimethylammonoethylmethylacrylate) polymer synthetic latex can be used to improve physical properties such as flexure and adhesion strength of concrete .

In addition, the crude steel concrete can suppress the neutralization of concrete by calcium chloride and improve the resistance to freezing and thawing according to the temperature change.

In addition, it is possible to improve economical efficiency by providing similar or superior physical properties to the physical and chemical properties of conventional SBR latex modified concrete while reducing the amount of synthetic latex added.

The crude steel concrete composition modified with the phenylethene-ethylpropenoidate polymer latex according to the present invention is characterized by using the excellent concrete fluidity of the phenylethene-ethylpropenoidate-based synthetic latex to improve the mixing ratio of the unhardened concrete It is possible to improve the physical strength such as compressive strength and flexural strength of the crude steel concrete composition according to the amount of reduction of the compounding amount by 30% or more than that of the existing crude steel concrete, and the synthetic latex is excellent in waterproofness, frictional resistance, 1 to 15 parts by weight of phenylethene-ethyl propenoate based polymer latex, 10 to 30 parts by weight of crude steel cement binder, 25 to 60 parts by weight of fine aggregate, 25 to 60 parts by weight of coarse aggregate, water 1 -10 parts by weight.

The phenylethyne-ethyl propenoate polymer latex was prepared by mixing 30-40 parts by weight of phenylethene, 30-40 parts by weight of ethyl-propenoate, 1-20 parts by weight of butyl-pro-2-enoate, 1-10 parts by weight of propenenitrile, 1-10 parts by weight of pro-2-enoic acid and 1-10 parts by weight of dimethylammonoethylmethyl acrylate.

The phenylethyne imparts stiffness to the polymerized synthetic latex film, thereby controlling the compressive strength and hardness of the synthetic latex modified concrete. The amount of the polymer latex modified is controlled by the amount of ethyl-propenoate in the main chain of the polymer Is preferably from 30 to 40% by weight. If the amount is less than 30% by weight, the rigidity of the concrete deteriorates and the compressive strength and the frictional resistance of the concrete can not be satisfied. Therefore, if the amount exceeds 40% by weight, the formation of the synthetic latex film becomes unstable, Tensile strength and the like are lowered.

The ethyl-propenoate improves the flexural strength of the latex-modified concrete in order to impart flexibility and control of the polymerized synthetic latex film. The amount of the ethyl-propenoate used is preferably 30-40% by weight in consideration of the polymerization rate with the polymer of the polymer main chain Do. If the amount is less than 30% by weight, the ductility of the concrete is insufficient. If the amount is more than 40% by weight, ductility is exceeded and the compressive strength is lowered.

The butyl-pro-2-enoate is effective in imparting ductility to the polymerized synthetic latex film and enhancing the flexural strength of the latex modified concrete. The butyl-pro-2-enoate is effective in preventing deterioration of the slab, It strengthens the strength. Therefore, the copolymerization ratio of phenylethene and ethyl-propenoate is preferably 1-20% by weight, and if the amount is 20% by weight or more, the ductility of the polymerized synthetic latex film is increased to lower the compressive strength of the concrete.

The 2-propenenitrile reinforces the stiffness of the polymerized synthetic latex film and increases the cross-linking of the main chain and the tensile strength of the film. Therefore, it maintains the tensile strength between the latex-cement and the latex-aggregate due to the traffic volume vibration of the latex mixed concrete and improves the cross-sectional fracture resistance. The amount thereof is preferably 1-10% by weight, and it is important to increase the ductility of the synthetic latex film to 10% by weight or more so that the amount thereof is adjusted to 10% by weight or less.

The pro-2-enoic acid imparts an anionic functional group to the first polymerized polymer of the polymerized latex, thereby neutralizing the surface of the cement particles having a large amount of cationic surface functional groups to prolong the pot life during concrete working, And the dispersion of cement and concrete by soil and fine particles on the surface of coarse aggregate. When the amount of the synthetic latex modified concrete is 10 wt% or more, material separation and fluidity are largely caused due to excessive dispersibility in the production of the synthetic latex modified concrete. Therefore, the use amount thereof is preferably about 1-10% by weight.

The dimethylammonoethylmethylacrylate imparts an inert amino group on the surface of the polymerized latex and improves the long-term strength of the concrete by increasing the bonding force between the latex particles, the latex particles, the cement and the aggregate particles in the concrete modified concrete. If the amount is 10 wt% or more, the dispersibility and storage stability of the synthetic latex deteriorate and the viscosity and compounding number of the synthetic latex modified concrete are increased, and workability and concrete strength are lowered. Therefore, the use amount thereof is preferably 1-10% by weight.

The crude steel cement binder comprises 50 to 90 parts by weight of crude steel cement, 1-20 parts by weight of anhydrous gypsum, 1-20 parts by weight of glass lime, 1-30 parts by weight of a mortar, 1-5 parts by weight of amorphous precipitated silica 0.01 to 1.0 part by weight of polyethylene oxide.

The crude steel cement is preferably one specified in KS. If the amount of the crude steel cement used is less than 50 parts by weight, the initial strength development is delayed to cause an early traffic opening problem. If the amount of the crude steel cement is more than 90 parts by weight, And the long-term strength and durability are deteriorated. Therefore, the amount of crude steel cement added is preferably 50-90 parts by weight.

The free anhydrous gypsum is used for initial condensation and strength development by reacting with water molecules used as compounding water. When the amount of the glass anhydrous gypsum is less than 1.0 part by weight, the effect of improving the initial strength is insufficient due to the delay of the concrete condensation of the synthetic latex modified concrete, and when the amount is more than 20 parts by weight, the initial curing is promoted too much. But the durability of concrete due to initial workability and over-expansion may be reduced.

The free lime is used for initial and medium strength development. When the added amount of the free lime is less than 1 part by weight, the effect of initial strength development of the synthetic latex modified concrete is insufficient. When the added amount is more than 20 parts by weight, the long term strength is excessively increased and the crack stability of the concrete is lowered.

The Hauin reinforces the toughness of the concrete and reacts with the water molecules used as the blending water to finally form an ultrafine micrometer-sized ettringite colloidal hydrate crystal, whereby the shrinkage and shrinkage during microporous filling and curing Reduce drying shrinkage. When the amount of the filler used is less than 1 part by weight, the early strength development is delayed. When the amount of the filler is more than 30 parts by weight, high hydration heat is generated during the curing process, thereby increasing the possibility of cracking due to thermal stresses on the surface and inside of the concrete. The amount of the above-mentioned hawthorn is preferably 1-30 parts by weight.

The hard silica is an ultrafine particle size powder in the form of a fine powder. It fills the pores in the concrete and induces hydration reaction through hydration reaction with the compound water. It strengthens the watertightness of the concrete and improves the waterproof property to improve the durability of the concrete. . If the amount of the ultrafine particles is more than 5 parts by weight, the specific surface area of the particles is rapidly increased to increase the water content of the concrete to be dispersed and the viscosity to be increased, thereby deteriorating the initial workability. Therefore, the amount thereof is preferably 1-5 parts by weight.

The polyethylene oxide is a water-soluble fluidity improver for reinforcing the bonding force between the cement, the aggregate and the synthetic latex, enhancing the water holding capacity, improving the viscosity, and improving the water resistance by the film formation. The average molecular weight of the powder flowability improver is 300,000-500,000 and the addition amount is 0.01-1.0 parts by weight. If the amount is less than 0.01 part by weight, the effect of improving the concrete thickening and flowability is reduced by half. If the amount is more than 1.0 part by weight, the fluidity of the concrete is deteriorated due to excessive viscosity increase. Therefore, 0.01 to 1.0 part by weight is preferable.

The fine aggregate has a particle size of 5 mm or less and can be used without limitation if it satisfies the reference standard value of concrete standard. When the amount of the fine aggregate is less than 25 parts by weight, the flatness of the concrete surface becomes poor. , Bleeding due to lowering of viscosity of concrete, material separation and long-term strength are lowered, and the amount of fine aggregate used is preferably 25-60 parts by weight.

The coarse aggregate has a particle size of about 19 mm and satisfies the standard value of concrete standard specification. When the amount of the coarse aggregate is less than 25 parts by weight, the strength of the concrete is decreased. When the amount of coarse aggregate is less than 60 parts by weight, The additional compounding number is required and the flatness of the concrete surface becomes poor. Therefore, the amount of the coarse aggregate is preferably 25-60 parts by weight.

The crude steel concrete composition modified with the phenylethene-ethyl propenoate based polymer latex and the concrete repair method using the same, the method comprising the steps of: confirming deterioration degree and deterioration degree of the packing layer; Removing the deteriorated portion or the damaged portion using a crusher; Cleaning the exposed surface of the dry tissue with a high-pressure water by removing a foreign matter and a damaged portion by using a cutting or punching machine; Covering the cleaned portion with a polyethylene film or a film equivalent thereto to convert the entire portion into a saturated dry state; Producing a crude steel concrete composition modified with the produced phenylethene-ethyl propenoate based polymer latex and placing it on a cutting surface; Planarizing the surface of the remodeled concrete using a deck fin and a screed; And spraying an oily curing agent on the surface of the repaired concrete to form a coating.

Hereinafter, preferred embodiments of the crude steel concrete composition modified with the phenylethene-ethyl propenoate polymer latex according to the present invention will be described in detail with reference to the drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art may understand the present invention without departing from the scope and spirit of the present invention. It is not.

≪ Example 1 >

20 parts by weight of crude steel cement binder, 40 parts by weight of fine aggregate, and 36 parts by weight of coarse aggregate were put into a forced concrete pan mixer and were dry mixed for 3 minutes. Then, 7 parts by weight of the compounding water and 7 parts by weight of phenylethynylpropenoidate polymer- 5 parts by weight were added to prepare a synthetic latex modified concrete composition.

As the crude steel cement binder, 80 parts by weight of crude steel cement, 15 parts by weight of anhydrous gypsum, 15 parts by weight of glass lime, 5 parts by weight of a mortar, 1.0 part by weight of precipitated silica and 0.04 part by weight of polyethylene oxide were used.

At this time, the phenylethene-ethyl propenoate polymer latex was prepared by mixing 0.25 part by weight of sodium tetrapyroposphate, 0.3 part by weight of sodium monododecyl sulfate and 0.3 part by weight of sodium hydroxide, 32.5 parts by weight of tin, 30 parts by weight of ethyl-propenoate, 20 parts by weight of butyl-prop-2-enoate, 5 parts by weight of 2-propenenitrile and 5.0 parts by weight of pro- A synthetic latex composed of 7.5 parts by weight of methyl acrylate, 0.3 part by weight of tertiary-butyl hydroperoxide and 0.5 part by weight of sodium hydroxymethanesulfinate was used.

≪ Example 2 >

 20 parts by weight of crude steel cement binder, 40 parts by weight of fine aggregate, and 36 parts by weight of coarse aggregate were put into a forced concrete pan mixer and were dry mixed for 3 minutes. Then, 7 parts by weight of the compounding water and 7 parts by weight of phenylethynylpropenoidate polymer- 5 parts by weight were added to prepare a synthetic latex modified concrete composition.

As the crude steel cement binder, 80 parts by weight of crude steel cement, 15 parts by weight of anhydrous gypsum, 15 parts by weight of glass lime, 5 parts by weight of a mortar, 3.0 parts by weight of precipitated silica and 0.05 part by weight of polyethylene oxide were used.

At this time, the phenylethene-ethyl propenoate polymer latex was prepared by mixing 0.25 part by weight of sodium tetrapyroposphate, 0.3 part by weight of sodium monododecyl sulfate and 0.3 part by weight of sodium hydroxide, 32.5 parts by weight of tin, 30 parts by weight of ethyl-propenoate, 20 parts by weight of butyl-prop-2-enoate, 5 parts by weight of 2-propenenitrile and 5.0 parts by weight of pro- A synthetic latex composed of 7.5 parts by weight of methyl acrylate, 0.3 part by weight of tertiary-butyl hydroperoxide and 0.5 part by weight of sodium hydroxymethanesulfinate was used.

≪ Example 3 >

20 parts by weight of crude steel cement binder, 40 parts by weight of fine aggregate, and 36 parts by weight of coarse aggregate were put into a forced concrete pan mixer and were dry mixed for 3 minutes. Then, 7 parts by weight of the compounding water and 7 parts by weight of phenylethynylpropenoidate polymer- 5 parts by weight were added to prepare a synthetic latex modified concrete composition.

As the crude steel cement binder, 80 parts by weight of crude steel cement, 15 parts by weight of anhydrous gypsum, 15 parts by weight of glass lime, 5 parts by weight of heavy oil, 5.0 parts by weight of precipitated silica and 0.06 part by weight of polyethylene oxide were used.

At this time, the phenylethene-ethyl propenoate polymer latex was prepared by mixing 0.25 part by weight of sodium tetrapyroposphate, 0.3 part by weight of sodium monododecyl sulfate and 0.3 part by weight of sodium hydroxide, 32.5 parts by weight of tin, 30 parts by weight of ethyl-propenoate, 20 parts by weight of butyl-prop-2-enoate, 5 parts by weight of 2-propenenitrile and 5.0 parts by weight of pro- A synthetic latex composed of 7.5 parts by weight of methyl acrylate, 0.3 part by weight of tertiary-butyl hydroperoxide and 0.5 part by weight of sodium hydroxymethanesulfinate was used.

≪ Comparative Example 1 &

20 parts by weight of the crude steel cement based binder, 40 parts by weight of fine aggregate and 36 parts by weight of coarse aggregate were put into a forced concrete pan mixer and were dry mixed for 3 minutes. Then, 7 parts by weight of the compounding water and 6 parts by weight of SBR latex were added, A composition was prepared.

The crude steel cement binder used was 80 parts by weight of crude steel cement, 15 parts by weight of glass anhydrous gypsum, 15 parts by weight of glass lime and 5 parts by weight of a mortar.

<Test Example>

Table 1 below shows the results of slump tests of latex modified concrete for Examples 1-3 and Comparative Example 1. The above slump test was carried out according to KS F2402 [Method of slump test of concrete].

division Slump (mm) Immediately after stirring After 20 minutes After 40 minutes Example 1 215 198 163 Example 2 206 183 155 Example 3 203 180 148 Comparative Example 1 210 145 60

According to the test results shown in Table 1, the fluidity of Examples 1 to 3 was higher than that of the cement concrete composition prepared according to Comparative Example 1, and the slump with time was also excellent in fluidity.

Table 2 below shows the results of compressive strength test of latex modified concrete for Examples 1-3 and Comparative Example 1. &lt; tb &gt; &lt; TABLE &gt; The test was conducted according to KS F2405 [Concrete Compressive Strength Test Method].

division Compressive strength (MPa) 24 hours 7 days 28th Example 1 24.5 29.3 47.1 Example 2 26.1 29.8 48.4 Example 3 26.8 30.1 49.6 Comparative Example 1 18.8 28.5 43.1

According to the test results shown in Table 2, the initial strengths of Examples 1 to 3 were superior to those of the cement concrete compositions prepared according to Comparative Example 1, and in particular, Examples 2 and 3 had the best long-term strength . These results indicate that the increase of the number of chemical bonds and the formation of etrein zite needle crystals as a result of the hydration reaction of amorphous hard silica are the result of the void filling and water -

Table 3 below shows the results of the flexural strength test of the latex modified concrete for Examples 1-3 and Comparative Example 1. The above test was conducted according to KS F22408 [Method of bending test of concrete].

division Flexural strength (MPa) 24 hours 7 days 28th Example 1 4.81 6.84 8.15 Example 2 4.95 6.93 8.21 Example 3 4.96 7.02 8.43 Comparative Example 1 3.38 5.98 7.91

According to the test results shown in Table 3, Examples 1 to 3 exhibited excellent flexural strengths as compared with the cement concrete compositions prepared according to Comparative Example 1. These results are shown in Examples 2 to 6 in which hard silica and polyethylene oxide were used 3 shows that the latex modified concrete composition prepared according to the present invention is the result of void filling and watering in the concrete.

Table 4 below shows the results of the adhesion tests of latex modified concrete for Examples 1-3 and Comparative Example 1. [ The test was carried out in accordance with KS F 2386 [Test Method for Bond Strength of Concrete].

division Bond strength (MPa) 24 hours 7 days 28th Example 1 1.45 1.66 1.98 Example 2 1.48 1.71 1.98 Example 3 1.48 1.83 2.01 Comparative Example 1 1.23 1.57 1.81

According to the test results shown in Table 4, Examples 1 to 3 exhibited excellent adhesion strength as compared with the cement concrete composition prepared according to Comparative Example 1. These results show that the phenylethene-ethyl propenoate polymer latex used in Examples 1 to 3 has superior adhesion between old and new concrete than the SBR latex used in Comparative Example 1.

Table 5 below shows the chlorine ion penetration resistance test results of the latex modified concrete for Examples 1-3 and Comparative Example 1. [ The test was carried out in accordance with KS F2711 [Test method for chloride ion penetration resistance of concrete].

division Chloride ion permeability (amount of passing charge, Coulomb) 7 days 28th Example 1 1532 454 Example 2 1432 380 Example 3 1430 315 Comparative Example 1 3254 980

According to the test results shown in Table 5, it was found that the chloride penetration amount of Examples 1 to 3 was significantly reduced as compared with the cement concrete composition prepared according to Comparative Example 1. [ The results show that the polymeric synthetic latex of phenylethyne-propyloinopolymer used in Examples 1 to 3 is more dense than the SBR latex used in Comparative Example 1 and has an effect of suppressing the penetration of chloride, The results of this study are as follows.

Table 6 below shows the results of the length change test of the mortar and concrete of the latex modified concrete according to Examples 1-3 and Comparative Example 1. The test was carried out in accordance with KS F2424 [Method of Length Change Test of Mortar and Concrete].

division Length change rate (%) 3 days 14 days 28th Example 1 0.024 -0.058 -0.108 Example 2 -0.022 -0.052 -0.102 Example 3 -0.021 -0.051 -0.104 Comparative Example 1 -0.028 -0.097 -0.133

According to the test results of Table 6, it can be seen that, in Examples 1 to 3, the rate of change in the initial length of the concrete is smaller than that of the cement concrete composition prepared in Comparative Example 1, but the rate of change in the long-term length is large . The results show that the phenylethyne-ethyl propenoate polymer latex used in Examples 1 to 3 suppressed the shrinkage of the concrete compared with the SBR latex modified concrete of Comparative Example 1, and the hard silica used in Examples 1 to 3 And that the polyethylene oxide serves as a shrinkage inhibitor of the anhydrous gypsum, free lime and crystallization of sheath and as an expanding agent.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, This is possible.

Claims (6)

10-30 parts by weight of crude steel cement binder, 25-60 parts by weight of fine aggregate, 25-60 parts by weight of coarse aggregate, 1-10 parts by weight of water, and phenylethyne-ethyl propenoate-based polymer synthetic latex 1-15 parts by weight,
At this time, the phenylethene-ethyl propenoate-based polymer synthetic latex is composed of 30-40 parts by weight of phenylethene, 30-40 parts by weight of ethyl-propenoate, 1-20 parts by weight of butyl-pro-2-enoate, 1-10 parts by weight of propenenitrile, 1-10 parts by weight of pro-2-enoic acid and 1-10 parts by weight of dimethylammonoethylmethyl acrylate,
Wherein the crude steel cement binder comprises 50 to 90 parts by weight of crude steel cement, 1-20 parts by weight of anhydrous gypsum (CaSO ₄ ), 1-20 parts by weight of free lime (CaO), 1-10 parts by weight of haueyne, 1 to 5 parts by weight of polyethylene oxide, 0.01 to 1.0 part by weight of polyethylene oxide having a molecular weight of 300,000 to 500,000, and 0.1 to 0.2 parts by weight of amorphous precipitated silica. &Lt; / RTI &gt;
delete delete delete delete 1) confirming the degradation site and the degree of deterioration of the packaging layer;
2) removing the deteriorated portion or the damaged portion using a crusher to expose the dry portion;
3) removing foreign substances and undamaged damage areas by using a cutting or punching machine to clean the exposed surface of the dry skin with high pressure water;
4) covering the cleaned dry part with a polyethylene film or a film equivalent thereto to make the entire part dry in a saturated state;
5) producing the crude steel concrete composition modified with the phenylethene-ethyl propenoate based polymer latex of claim 1 and placing the same on a cutting surface;
6) planarizing the surface of the remodeled concrete using a deck fin and a screed; And
7. A method for repairing concrete pavement using a crude steel concrete composition modified with a polymeric latex of phenylethene-ethyl propenoate based polymer, comprising the step of spraying an oil-based curing agent on the surface of the repaired concrete to form a coating.