KR102065541B1 - Surface-reinforced super-early-hardening cement concrete composition and road repairing or reinforcing method therewith - Google Patents

Abstract

The present invention relates to a surface layer-reinforcing rapid hardening cement concrete composition and a method of repairing and reinforcing pavement of a road using the same. The surface layer-reinforcing rapid hardening cement concrete composition comprises: 3-50 wt% of an initial strength expressing agent; 5-65 wt% of fine aggregate; 3-65 wt% of coarse aggregate; 0.01-30 wt% of a performance expressing agent; and 0.1-30 wt% of water. The performance expressing agent includes: 30-98 wt% of a styrene-methyl methacrylate-butyl acrylate copolymer; 1-25 wt% of an acrylic acid alkyl ester-acrylonitrile copolymer; 0.1-15 wt% of an ethylene-methylmethacrylate-vinyl acetate copolymer; 0.1-15 wt% of polyacrylic acid methyl; 0.1-15 wt% of a polyisobutyl methacrylate copolymer; 0.1-5 wt% of a polycarboxylic acid-based reducing agent; and 0.1-5 wt% of a silicon-based antifoaming agent. According to the present invention, the surface layer-reinforcing rapid hardening cement concrete composition is capable of increasing workability of concrete, improving strength of concrete, and specifically, strengthening a surface layer to improve scaling resistance, prevent generation of cracks, and greatly increase durability. In addition, the present invention is capable of producing dense concrete by promoting early hydration of cement and densification of tissues, thereby improving strength and durability, especially waterproof and rustproof performance of concrete. Furthermore, an expansion material and a shrinkage reducing agent are used to prevent surface cracking and expansion/destruction phenomena caused by drying shrinkage. Meanwhile, the present invention is able to satisfy all conditions required for pavement of a road, that is, wear resistance, watertightness, adhesion, durability, and crack resistance.

Description

Surface-reinforced superhard cement concrete composition and road pavement repair and reinforcement method using the same {SURFACE-REINFORCED SUPER-EARLY-HARDENING CEMENT CONCRETE COMPOSITION AND ROAD REPAIRING OR REINFORCING METHOD THEREWITH}

The present invention relates to a surface-reinforced superhard cement concrete composition and road pavement repair and reinforcement method using the same, and more specifically, made of concrete, such as bridge overlay pavement, expansion of cement concrete pavement for earthworks, cement concrete pavement repair, etc. The present invention relates to a cemented carbide cement concrete composition used in civil engineering repair work and road pavement repair and reinforcement methods using the same.

In general, the use of cemented carbide cements has several problems in the long term. Concrete with cemented carbide is effective for early rapid strength development, but due to the relatively high heat of hydration and dry shrinkage compared to normal portland cement in the early stage of curing, shrinkage due to heat and moisture transfer within the structure is constrained by internal and external factors. Cracks are likely to occur Such microcracks can directly cause degradation of the mechanical properties and durability of the structure by increasing the permeability in the concrete matrix and induce various types of fractures can have a serious impact on the stability of the structure.

On the other hand, crude steel portland cement (three types of cement) is widely used for repairing or reinforcing the sites where corrosion or erosion occurs, such as bridge slabs, pavement roads, and outer walls of concrete structures. However, crude steel portland cement has the advantage of excellent workability compared to the general cement, high permeability, there is a problem that the concrete is corroded due to the penetration of chloride or water.

In particular, the crude steel Portland cement has a problem that is difficult to use for emergency repair work that requires a short time due to the nature of the work because the curing time (2 to 3 hours) to harden the concrete due to its characteristics.

On the other hand, when the cracks occur in concrete and the time passes, the compressive strength of the concrete and the tensile strength of the reinforcing bars gradually decrease, and the concrete exposed through the cracked site undergoes chlorine ion penetration, freezing thawing, and neutralization to cause corrosion of the steel. do. If the rebar corrosion increases, the concrete structure may eventually collapse. In the repair of such a concrete structure, only the cement-based material cannot secure the required quality, and thus, a repair material having excellent strength and durability such as a concrete-polymer composite is used.

Registered Patent Publication No. 10-1911009 (2018.10.17.) Korean Patent Publication No. 10-1953106 (2019.02.22.)

Therefore, the technical problem to be solved in the present invention is to provide a cemented carbide cement composition having an alkali imparting effect and shrinkage reduction effect.

In addition, another technical problem to be solved by the present invention is to provide a road pavement repair and reinforcement method using the surface-reinforced cemented carbide cement composition.

In order to solve the above technical problem, in the present invention, 3 to 50% by weight of initial strength expression material, 5 to 65% by weight of fine aggregate, 3 to 65% by weight of coarse aggregate, 0.01 to 30% by weight of performance expression agent and 0.1 to 30% of water. Wt%, the initial strength expression material is 5 to 70% by weight of crude steel portland cement, 5 to 60% by weight of calcium sulfoaluminate, 1 to 40% by weight of amorphous tricalcium aluminate cement, 1 to 40% by weight of alumina silicate 30 wt%, gypsum 0.1-20 wt%, boron nitride 0.1-20 wt%, zirco aluminate 0.1-20 wt%, germanium 0.01-20 wt%, aluminosilicate 0.01-15 wt%, lithium carbonate 0.01-10 wt% %, 0.01-10% by weight of metaphosphate and 0.01-10% by weight of lithium disilicate, wherein the performance expression agent is 30-98% by weight of styrene-methylmethacrylate-butylacrylate copolymer, alkyl acrylate-acrylic acid 1 to 25% by weight of ronitrile copolymer, ethyl 0.1-15 wt% of ethylene-methyl methacrylate-vinyl acetate copolymer, 0.1-15 wt% of polymethyl acrylate, 0.1-15 wt% of polyisobutyl methacrylate copolymer, 0.1-5 wt% of polycarboxylic acid-based water reducing agent, and It provides a cemented carbide cement composition, characterized in that it comprises 0.1 to 5% by weight of the silicone-based antifoaming agent.

The initial strength expression material may further comprise 0.01 to 10% by weight potassium chloride.

In addition, the initial strength expression material may further comprise 0.01 to 10% by weight of peat to prevent material separation and improve water resistance.

In addition, the initial strength expression material may further comprise 0.001 to 5% by weight of a reducing agent.

In addition, the initial strength expression material may further comprise 0.01 to 5% by weight of a retardant.

The performance expression agent may further comprise 0.01 to 10% by weight of N-alkoxymethylpolyamide.

In addition, the performance expression agent may further comprise 0.01 to 10% by weight of polyethyleneimine.

In addition, the present invention provides a road pavement repair and reinforcement method using the cemented carbide cement composition comprising the following steps, in order to solve the other technical problems described above.

The concrete structure is deteriorated due to the deterioration of the concrete and the asphalt concrete to remove the step using a road crusher, and the removed portion to the lower portion by the water jet, high pressure washer, hand water jet, planer, shot blast, etc. Removing and cleaning with a vacuum suction vehicle, and the superhard cement concrete composition is integrated with the existing concrete slab, to suppress the penetration of harmful substances, water, chlorine ions, etc. and to express the performance in the cleaned area to improve adhesion Applying the agent, adding the cemented carbide cement composition to the upper portion of the performance-expressing agent, and expanding and repairing and reinforcing the cross section of the deteriorated portion; and sliding the surface of the cemented cement cement composition to be poured. Performing longitudinal and transverse tanning for prevention; And coating and curing the film curing agent to prevent plastic evaporation by preventing moisture evaporation on the cemented cement cement composition.

According to the present invention, it is possible to improve the workability of the concrete by using the performance expression agent and the initial strength expression material, improve the strength of the concrete, in particular, by strengthening the surface layer to improve the skeletal resistance, prevent cracking and increase durability. Can be improved. In addition, the early hydration of the cement and the densification of the structure can be promoted to make dense concrete, thereby improving the strength and durability of the concrete, particularly waterproof and rustproof. In addition, by using the expansion material and the shrinkage reducing agent, it is possible to obtain an effect that can exhibit the effect of preventing the surface crack and expansion fracture phenomenon by the dry shrinkage. On the other hand, all the properties required for packaging, that is, wear resistance, watertightness, adhesion, durability and crack resistance can all be satisfied.

The cemented carbide cement composition of the present invention comprises 3 to 50% by weight of initial strength expressing material, 5 to 65% by weight of fine aggregate, 3 to 65% by weight of coarse aggregate, 0.01 to 30% by weight of performance expressing agent and 0.1 to 30% by weight of water. It is characterized by including.

Aggregates used in the present invention 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 larger particle size than 5 mm are classified as coarse aggregates. The fine aggregate is preferably contained 5 to 65% by weight based on the cemented carbide cement concrete composition of the present invention, the coarse aggregate is preferably contained 3 to 65% by weight based on the cemented carbide cement composition of the present invention.

The initial strength expression material is 5 to 70% by weight of crude steel Portland cement, 5 to 60% by weight of calcium sulfoaluminate, 1 to 40% by weight of amorphous tricalcium aluminate cement, 1 to 30% by weight of alumina silicate-based senofare, gypsum 0.1 -20 wt%, boron nitride 0.1-20 wt%, zirco aluminate 0.1-20 wt%, germanium 0.01-20 wt%, aluminosilicate 0.01-15 wt%, lithium carbonate 0.01-10 wt%, metaphosphate 0.01- 10 weight percent and 0.01-10 weight percent of lithium disilicate.

The crude steel portland cement is preferably used as specified in KS, it is preferable to contain 5 to 70% by weight relative to the initial strength expression material. Preferably, the crude steel portland cement has a powder degree of 5,000 to 9,000 cm 2 / g.

Increasing the weight ratio of the calcium sulfoaluminate shows fast curing characteristics. The calcium sulfoaluminate is preferably contained 5 to 60% by weight based on the initial strength expression material. When the content of calcium sulfoaluminate is less than 5% by weight, the effect of improving concrete strength and suppressing cracking may be weak. When the content of calcium sulfoaluminate is more than 60% by weight, the early strength is excellent. However, it is not economical due to poor workability and high manufacturing cost.

The amorphous tricalcium aluminate cement is used to improve early strength expression and chemical resistance. The amorphous tricalcium aluminate cement is preferably contained 1 to 40% by weight based on the initial strength expression material. When the content of the amorphous tricalcium aluminate cement exceeds 40% by weight, the curing time is shortened and the pot life is lowered. When the content is less than 1% by weight, the early strength is lowered.

The alumina silicate-based senofare is used to obtain a waterproof effect as well as improving pozzolanic properties, long-term strength and durability. The alumina silicate-based senono spare is preferably contained 1 to 30% by weight based on the initial strength expression material. When the content of the alumina silicate-based senono spare is less than 1% by weight, the performance improvement effect is insufficient, and when the content exceeds 30% by weight, the initial strength may be decreased.

The gypsum is used for initial strength development and to prevent shrinkage. The gypsum is used to compact the tissue to prevent cracking of the concrete and to prevent shrinkage of the concrete. The gypsum is preferably contained in an amount of 0.1 to 20% by weight based on the initial strength expression material. When the gypsum content is less than 0.1 wt% with respect to the initial strength expression material, the effect of inhibiting concrete strength and cracking may be weak, and when the gypsum content exceeds 20 wt%, it has good physical properties due to fast curing properties. However, overexpansion and water resistance deteriorate.

The boron nitride is used to enhance strength, wear resistance, and corrosion resistance. The boron nitride is preferably contained 0.1 to 20% by weight based on the initial strength expression material. When the content of the boron nitride is less than 1% by weight, the performance improvement effect may be insufficient. When the content of the boron nitride exceeds 20% by weight, the workability is lowered and the price competitiveness is lowered.

The zirco aluminate is used to improve reactivity to prevent initial strength development, wear resistance and shrinkage. The zirco aluminate is used to compact the structure to prevent cracking of the concrete and to prevent shrinkage of the concrete. The zirco aluminate is preferably contained in an amount of 0.1 to 20% by weight based on the initial strength expression material. The zirco aluminate exhibits rapid curing characteristics as the weight ratio is increased, and the initial strength of the concrete, the wear resistance and the cracking inhibiting effect may be weak when the content of the zirco aluminate is less than 0.1 wt% with respect to the initial strength expressing material. In addition, when the content of the zirco aluminate is more than 20% by weight, good physical properties can be obtained due to the fast curing property, but the manufacturing cost is high, and thus it is not economical.

The germanium is used to increase strength, waterproofness, durability and heat resistance. The germanium is preferably contained in an amount of 0.01 to 20% by weight based on the initial strength expression material. If the germanium content is less than 0.01% by weight, the workability is improved, but the performance improvement effect is insufficient, and if the germanium content is more than 20% by weight, the performance is improved but the price competitiveness is lowered.

The aluminosilicates are used to improve strength, corrosion resistance and chemical resistance. The aluminosilicate is preferably contained in an amount of 0.01 to 15% by weight based on the initial strength expression material. When the weight ratio of the aluminosilicate is increased, it shows strength and chemical resistance. When the content of the aluminosilicate is less than 0.01% by weight, the effect of improving strength and chemical resistance may be weak, and the content of the aluminosilicate is 15% by weight. If it exceeds, it is not economical because no further performance improvement effect is obtained and manufacturing cost is high.

The lithium carbonate is used to control the initial curing rate. The lithium carbonate is preferably contained in an amount of 0.01 to 10% by weight based on the initial strength expression material. When the content of the lithium carbonate is less than 0.01% by weight, the initial strength expression is slowed down, when the content of the lithium carbonate exceeds 10% by weight, the reactivity is increased, the workability is lowered and the price competitiveness is lowered.

The metaphosphate is used to improve the waterproofing, rust preventing and shrinkage reducing effect. The metaphosphate is preferably contained in an amount of 0.01 to 10% by weight based on the initial strength expression material. When the content of the metaphosphate is less than 0.01% by weight, the performance improvement effect may be reduced. When the content of the metaphosphate exceeds 10% by weight, the workability is lowered and the price competitiveness is lowered.

The lithium disilicate is used to obtain the effect of improving the initial strength and durability. The lithium disilicate is preferably contained in an amount of 0.01 to 10% by weight based on the initial strength expression material. When the content of the lithium disilicate is less than 0.01% by weight, the initial strength expression effect and the shrinkage reducing effect are insufficient, and when the content of the lithium disilicate is more than 10% by weight, the curing is accelerated to lower workability and economic efficiency.

The initial strength expression material may further include potassium chloride. The potassium chloride is used to improve the initial strength expression and water resistance by improving the reactivity. The potassium chloride is preferably contained in an amount of 0.01 to 10% by weight based on the initial strength expression material. When the content of the potassium chloride is less than 0.01% by weight, the performance improvement effect may be weak. When the content of the potassium chloride exceeds 10% by weight, the performance improvement effect is excellent, but workability and price competitiveness are lowered.

The initial strength expression material may further include peat to prevent material separation and improve water resistance. The peat is preferably contained in an amount of 0.01 to 10% by weight based on the initial strength expression material. When the content of the peat is less than 0.01% by weight, the effect of preventing material separation and improving the water resistance may be insignificant, and when the content of the peat is more than 10% by weight, the viscosity is high, the workability is lowered and the initial strength is lowered. do.

The initial strength expression material may further include a water reducing agent. The water reducing agent is used to reduce the water-cement ratio of the cemented carbide cement concrete composition to improve strength and durability. The water reducing agent may be a polycarboxylic acid-based, melamine-based or naphthalene-based water reducing agent. It is preferable to use a naphthalene-based sensitizer excellent in the effect of improving the strength and durability, and excellent in the effect of reducing the water-cement ratio, and it is preferable to contain 0.001 to 5% by weight based on the initial strength expression material.

The initial strength expression material may further comprise a retardant. The retardant may be used to secure workability for a certain time and delay the hardening. The retardant is preferably contained in an amount of 0.01 to 5% by weight based on the initial strength expression material. 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 performance expression agent is used to improve the curing time, workability, strength and durability of the cemented carbide cement concrete composition, 30 to 98% by weight of styrene-methyl methacrylate-butyl acrylate copolymer, alkyl acrylate- 1 to 25% by weight of acrylonitrile copolymer, 0.1 to 15% by weight of ethylene-methyl methacrylate-vinyl acetate copolymer, 0.1 to 15% by weight of polymethyl acrylate, 0.1 to 15% by weight of polyisobutyl methacrylate copolymer It may include 0.1 to 5% by weight of a polycarboxylic acid-based water reducing agent and 0.1 to 5% by weight of a silicone-based antifoaming agent.

The performance expression agent is preferably contained in 0.01 to 30% by weight in the cemented carbide cement composition. When the content of the performance expressing agent is more than 30% by weight, the viscosity of the cemented carbide cement composition is low, so that it is easy to separate the material, delay the hydration reaction to lower the initial compressive strength expression and at the same time the price competitiveness can be lowered. have. And when the content of the performance expression agent is less than 0.01% by weight, the curing time, workability, strength and durability improvement effect may be weak.

The styrene-methyl methacrylate-butylacrylate copolymer is used to improve the binding strength and durability. The styrene-methylmethacrylate-butylacrylate copolymer is preferably contained in an amount of 30 to 98% by weight based on the performance expressing agent. When the content of the styrene-methyl methacrylate-butyl acrylate copolymer exceeds 98% by weight, the workability is improved, but the initial strength may be decreased, and the styrene-methyl methacrylate-butyl acrylate copolymer If the content is less than 30% by weight, the initial strength development of the concrete is improved, but workability is significantly reduced.

The alkyl acrylate ester-acrylonitrile copolymer is used to improve toughness, adhesion strength and durability. It is preferable that the said alkyl acrylate ester-acrylonitrile copolymer is contained 1-25 weight% with respect to the said performance expression agent. If the content of the alkyl acrylate ester-acrylonitrile copolymer exceeds 25% by weight, the performance is improved, but the viscosity is high, workability (slump) may be lowered, and the content of the alkyl acrylate ester-acrylonitrile copolymer is If it is less than 1% by weight, the effect of improving toughness, adhesion strength and durability may be weak.

The ethylene-methylmethacrylate-vinyl acetate copolymer is used to improve strength and durability. The ethylene-methyl methacrylate-vinyl acetate copolymer is preferably contained in an amount of 0.1 to 15% by weight based on the performance expression agent, the content of the ethylene-methyl methacrylate-vinyl acetate copolymer is more than 15% by weight If the performance is improved but price competitiveness may be lowered, the strength and durability improvement effect may be weak if the content of the ethylene-methyl methacrylate-vinyl acetate copolymer is less than 0.1% by weight.

The polymethyl acrylate is used to improve the workability, wear resistance and durability of the performance expression agent. It is preferable that the said polymethyl acrylate is contained 0.1-15 weight% with respect to the said performance expression agent. When the content of methyl polyacrylate exceeds 15% by weight, the wear resistance and durability improvement effect may not be expressed any more, and the price competitiveness may be lowered. When the content of the methyl polyacrylate is less than 0.1% by weight, workability, wear resistance and durability The improvement effect may be insufficient.

The polyisobutyl methacrylate copolymer is used to improve workability, strength and durability. It is preferable that the said polyisobutyl methacrylate copolymer is contained 0.1-15 weight% with respect to the said performance expression agent. When the content of the polyisobutyl methacrylate copolymer is less than 0.1% by weight, the performance improvement effect is lowered. When the content is more than 15% by weight, the strength and durability are improved, but the viscosity is low, so that material separation is likely to occur.

The polycarboxylic acid-based water reducing agent serves to improve the initial workability by delaying the hydration reaction of the crude steel cement while improving the strength and durability by reducing the water-cement ratio. It is preferable that the said polycarboxylic acid type reducing agent is contained 0.1 to 5 weight% with respect to the said performance expression agent.

The silicone antifoaming agent is used to lower the amount of air and lower the voids to improve strength and durability. It is preferable that the said silicone type antifoamer contains 0.1-5 weight% with respect to the said performance expression agent.

In addition, the performance expression agent may further comprise N-alkoxymethylpolyamide. The N-alkoxymethylpolyamide is used for improving strength and water resistance. It is preferable that the said N-alkoxymethyl polyamide is contained 0.01 to 10 weight% with respect to the said performance expression agent. When the content of the N-alkoxymethylpolyamide exceeds 10% by weight, the performance is improved, but the viscosity may be increased, and workability may be reduced. When the content of the N-alkoxymethylpolyamide is less than 0.01% by weight, the performance improvement effect is obtained. It may be weak.

In addition, the performance expression agent may further include polyethyleneimine. The polyethyleneimine is used to improve wear resistance, toughness and impact resistance. The polyethyleneimine is preferably contained in an amount of 0.01 to 10% by weight based on the performance expression agent. When the content of the polyethyleneimine exceeds 10% by weight, the performance is improved but the workability is lowered, and the content of the polyethyleneimine is 0.01. If it is less than the weight%, the effect of improving performance is insufficient.

The cemented carbide cement composition with improved durability according to a preferred embodiment of the present invention is stirred 5 to 65% by weight of initial strength expression material, 5 to 65% by weight fine aggregate, 3 to 65% by weight coarse aggregate in a forced mixer, 0.01 to 30% by weight of the performance expression agent and 0.1 to 30% by weight of water may be further mixed and prepared by stirring for a predetermined time (for example, 1 to 10 minutes).

Hereinafter, a road pavement repair and reinforcement method according to a preferred embodiment of the present invention will be described.

Road pavement repair and reinforcement method using the cemented carbide cement composition according to a preferred embodiment of the present invention, the concrete structure is degraded due to the performance degradation and the step of removing the concrete and asphalt concrete using a road surface crusher, removal Removing the deteriorated parts with water jet, high pressure washer, hand water jet, planer, shot blast, etc. to the lower part and cleaning them with vacuum suction vehicle, and the cemented carbide cement composition is integrated with the existing concrete slab and harmful substances, In order to suppress the penetration of water, chlorine ions and the like and to improve adhesion, the performance-expressing agent is applied to the cleaned area, and the superhard cement cement composition is poured on top of the application of the performance-expressing agent to deteriorate the site. Repairing and reinforcing by expanding the cross section of the Performing longitudinal and lateral tinning to prevent slippage of the cemented carbide cement composition; And coating and curing the film curing agent to prevent plastic evaporation by preventing moisture evaporation on the cemented cement cement composition.

The deterioration site may further include removing the lower portion of the reinforcing bar and removing rust of the exposed bar before applying the performance expression agent. In the case of chipping using the crusher and the waterjet, in the normal case, the rebar of the concrete structure is not exposed, but in the case of severe deterioration, the rebar may be exposed in the deteriorated area. According to the invention, it is not necessary to perform separate reinforcing bar rust treatment.

According to the present invention, it is possible to improve the workability of the concrete by using the performance-expressing agent and the initial strength-expressing material, to improve the strength, in particular the tensile strength and the adhesion strength of the concrete, and to reduce the wear resistance and the amount of dry shrinkage to prevent cracking. It can suppress, and can improve durability, especially waterproofing and rust prevention property.

Hereinafter, embodiments of the cemented carbide cement concrete composition according to the present invention are presented in more detail, and the present invention is not limited to the following examples.

<Example 1>

20% by weight of initial strength expression material, 38% by weight aggregate, 36% by weight coarse aggregate were added to a stirring mixer and stirred, followed by further mixing 4% by weight of performance-expressing agent and 2% by weight of water, followed by stirring for 2 minutes. A light cement concrete composition was prepared.

At this time, the initial strength expression material is 33% by weight of crude steel portland cement, 20% by weight calcium sulfoaluminate, 10% by weight of amorphous tricalcium aluminate cement, 10% by weight of alumina silicate-based senospare, 5% by weight of gypsum, 5% by weight of boron nitride %, Zirco Aluminate 5 wt%, Germanium 5 wt%, Aluminosilicate 1 wt%, Lithium carbonate 1 wt%, Metaphosphate 1 wt%, Lithium disilicate 1 wt%, Potassium chloride 1 wt%, Peat 1 wt% %, 0.5% by weight reduction agent and 0.5% by weight retardant were used in combination. At this time, the water reducing agent was a polycarboxylic acid-based water reducing agent, the retardant was citric acid-based retardant.

The performance expression agent is 93% by weight of styrene-methyl methacrylate-butylacrylate copolymer, 1% by weight of alkyl acrylate-acrylonitrile copolymer, 1% by weight of ethylene-methylmethacrylate-vinyl acetate copolymer, poly One containing 1% by weight of methyl acrylate, 1% by weight of polyisobutyl methacrylate copolymer, 1% by weight of N-alkoxymethylpolyamide, 1% by weight of polyethyleneimine, 0.5% by weight of a reducing agent and 0.5% by weight of an antifoaming agent was used. In this case, the water reducing agent is a polycarboxylic acid-based water reducing agent, the antifoaming agent was used a silicone antifoaming agent.

<Example 2>

20% by weight of initial strength expression material, 38% by weight aggregate, 36% by weight coarse aggregate were added to a stirring mixer and stirred, followed by further mixing 4% by weight of performance-expressing agent and 2% by weight of water, followed by stirring for 2 minutes. A light cement concrete composition was prepared.

At this time, the initial strength expression material is 33% by weight of crude steel portland cement, 20% by weight calcium sulfoaluminate, 10% by weight of amorphous tricalcium aluminate cement, 10% by weight of alumina silicate-based senospare, 5% by weight of gypsum, 5% by weight of boron nitride %, Zirco Aluminate 5 wt%, Germanium 5 wt%, Aluminosilicate 1 wt%, Lithium carbonate 1 wt%, Metaphosphate 1 wt%, Lithium disilicate 1 wt%, Potassium chloride 1 wt%, Peat 1 wt% %, 0.5% by weight reduction agent and 0.5% by weight retardant were used in combination. At this time, the water reducing agent was a polycarboxylic acid-based water reducing agent, the retardant was citric acid-based retardant.

The performance expression agent is 89% by weight of styrene-methyl methacrylate-butylacrylate copolymer, 2% by weight alkyl acrylate-acrylonitrile copolymer, 2% by weight ethylene-methylmethacrylate-vinyl acetate copolymer, poly 2% by weight of methyl acrylate, 2% by weight of polyisobutyl methacrylate copolymer, 1% by weight of N-alkoxymethylpolyamide, 1% by weight of polyethyleneimine, 0.5% by weight of a reducing agent and 0.5% by weight of an antifoaming agent were used. In this case, the water reducing agent is a polycarboxylic acid-based water reducing agent, the antifoaming agent was used a silicone antifoaming agent.

<Example 3>

20% by weight of initial strength expression material, 38% by weight aggregate, 36% by weight coarse aggregate were added to a stirring mixer and stirred, followed by further mixing 4% by weight of performance-expressing agent and 2% by weight of water, followed by stirring for 2 minutes. A light cement concrete composition was prepared.

At this time, the initial strength expression material is 33% by weight of crude steel portland cement, 20% by weight calcium sulfoaluminate, 10% by weight of amorphous tricalcium aluminate cement, 10% by weight of alumina silicate-based senospare, 5% by weight of gypsum, 5% by weight of boron nitride %, Zirco Aluminate 5 wt%, Germanium 5 wt%, Aluminosilicate 1 wt%, Lithium carbonate 1 wt%, Metaphosphate 1 wt%, Lithium disilicate 1 wt%, Potassium chloride 1 wt%, Peat 1 wt% %, 0.5% by weight reduction agent and 0.5% by weight retardant were used in combination. At this time, the water reducing agent was a polycarboxylic acid-based water reducing agent, the retardant was citric acid-based retardant.

The performance expression agent is 85% by weight of styrene-methyl methacrylate-butylacrylate copolymer, 3% by weight alkyl acrylate-acrylonitrile copolymer, 3% by weight ethylene-methylmethacrylate-vinyl acetate copolymer, poly 3% by weight of methyl acrylate, 3% by weight of polyisobutyl methacrylate copolymer, 1% by weight of N-alkoxymethylpolyamide, 1% by weight of polyethyleneimine, 0.5% by weight of a reducing agent and 0.5% by weight of an antifoaming agent were used. In this case, the water reducing agent is a polycarboxylic acid-based water reducing agent, the antifoaming agent was used a silicone antifoaming agent.

In order to more easily understand the characteristics of the above Examples 1 to 3 is presented a comparative example that can be compared with the embodiments of the present invention, Comparative Example 1 to be described later is a cement concrete composition which is currently widely used It is presented.

Comparative Example 1

20% by weight of cemented carbide, 38% by weight of fine aggregate and 36% by weight of coarse aggregate were added to a stirring mixer and stirred, followed by further adding 4% by weight of styrene-methylmethacrylate-butylacrylate copolymer and 2% by weight of water. The mixture was stirred for another 2 minutes to prepare a cement concrete composition.

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

<Test Example 1>

The cemented carbide cement concrete composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to a slump test (degree of kneading) 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, excellent workability when pouring concrete.

Table 1 below shows the change in slump over time.

division Slump (cm) Immediately after stirring After 20 minutes After 30 minutes After 40 minutes Example 1 21 19 14 11 Example 2 21 19.5 15.5 12 Example 3 20 19.5 17.5 15.5 Comparative Example 1 19 14 8 5

As shown in Table 1, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 is excellent in workability compared to the cement concrete composition prepared according to Comparative Example 1, in particular, prepared according to Example 3 The cemented carbide cement composition does not have a large change in slump even with time, and thus has excellent workability.

<Test Example 2>

The cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to a compressive strength test according to the method specified in KS F 2405.

Table 2 shows the changes in compressive strength over time.

division Compressive strength (MPa) 4 hours later 1 day later 7 days later In 28 days Example 1 30.5 36.5 41.0 44.0 Example 2 315 37.3 42.3 46.0 Example 3 32.5 38.0 43.5 48.1 Comparative Example 1 27.3 32.9 38.0 42.0

As shown in Table 2, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 had significantly higher compressive strength than the cement concrete composition prepared according to Comparative Example 1.

<Test Example 3>

The results of measuring the bending strength of the cemented carbide cement composition according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were measured according to the method specified in KS F 2408.

Table 3 is a change in bending strength over time.

division Flexural strength (MPa) 4 hours later 1 day later 7 days later In 28 days Example 1 5.4 5.9 6.9 7.1 Example 2 5.6 6.1 7.3 7.5 Example 3 5.9 6.5 7.6 7.8 Comparative Example 1 5.0 5.4 6.2 6.5

As shown in Table 3, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 had significantly higher flexural strength than the cement concrete composition prepared according to Comparative Example 1.

<Test Example 4>

Bond strength was measured according to the method specified in KS F 2762 for the cemented carbide cement composition according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1, and the results are shown in Table 4. Indicated.

division Adhesive strength (MPa) 4 hours later 1 day later 7 days later In 28 days Example 1 1.6 1.68 1.95 2.15 Example 2 1.63 1.72 2.0 2.25 Example 3 1.66 1.78 2.1 2.4 Comparative Example 1 1.51 1.55 1.7 1.98

As shown in Table 4, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 was significantly higher than the cement concrete composition prepared according to Comparative Example 1.

<Test Example 5>

The cementitious cement cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were measured for the length change rate by KS F 2424 (Test method for changing the length of concrete). It is shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Length change rate (%) 0.011 0.009 0.003 0.020

As shown in Table 5, it was confirmed that the cemented carbide cement composition according to Examples 1 to 3 is reduced in length change rate compared to the cement concrete composition prepared according to Comparative Example 1 has the effect of reducing shrinkage. .

<Test Example 6>

The cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to a neutralization resistance test by KS F 4042, and the results are shown in Table 6 below.

Example 1 Example 2 Example 3 Comparative Example 1 Neutralization Depth (mm) 0.2 0.14 0.09 0.3

As shown in Table 6, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 has a lower neutralization depth than the cement concrete composition prepared according to Comparative Example 1, indicating that the resistance to neutralization is high. there was.

<Test Example 7>

The cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to salt penetration resistance test by KS F 2711, and the results are shown in Table 7 below. .

Example 1 Example 2 Example 3 Comparative Example 1 Salt penetration resistance (coulombs) 590 530 480 700

As shown in Table 7, it was confirmed that the cemented carbide cement concrete compositions prepared according to Examples 1 to 3 had higher resistance to salt penetration than the cement concrete compositions prepared according to Comparative Example 1.

<Test Example 8>

Freeze-thawing resistance test was carried out according to the method prescribed in KS F 2456 for the cemented carbide cement concrete composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1, and the results are shown in the following table. 8 is shown.

Example 1 Example 2 Example 3 Comparative Example 1 Freeze thawing resistance (%) 89 90 92 85

As shown in Table 8, it was found that the cemented carbide cement concrete composition prepared according to Examples 1 to 3 had superior freeze-thawing resistance as compared to the cement concrete composition prepared according to Comparative Example 1.

<Test Example 9>

The cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to an abrasion resistance test according to the method specified in ASTM C 779, and the results are shown in Table 9 below. Shown in

Example 1 Example 2 Example 3 Comparative Example 1 Abrasion Resistance (mm) 0.05 0.03 0.02 0.08

As shown in Table 9, it was found that the cemented carbide cement concrete composition prepared according to Examples 1 to 3 had superior abrasion resistance than the cement concrete composition prepared according to Comparative Example 1.

<Test Example 10>

The cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were subjected to 2% hydrochloric acid according to Japanese Industrial Standards [Test method of chemical resistance by solution deposition of concrete]. The test results of the chemical resistance test were immersed for 28 days in a test solution in an aqueous solution of 5% sulfuric acid and 45% sodium hydroxide, and the results of the chemical resistance test are shown in Table 10 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Weight change rate
(%) Hydrochloric acid -0.8 -0.6 -0.4 -1.4 Sulfuric acid -0.05 0 0 -0.12 Sodium hydroxide +0.1 +0.2 +0.4 0

As shown in Table 10, the cemented carbide cement composition according to Examples 1 to 3 is less weight change rate for the chemical resistance compared to the cement concrete composition prepared according to Comparative Example 1 for the chemical resistance It was confirmed that the resistance is high.

<Test Example 11>

In order to compare the properties of the cemented carbide cement composition prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1, an anti-rust test was performed by KS F 2561 (Antirust for Reinforced Concrete). The results are shown in Table 11 below.

Test Items Example 1 Example 2 Example 3 Comparative Example 1 Antirust rate (%) 96.3 97.0 97.8 95.1

As shown in Table 11, the cemented carbide cement concrete composition prepared according to Examples 1 to 3 was confirmed that the anti-rusting rate is high compared to the cement concrete composition prepared according to Comparative Example 1, the anti-rusting rate is high. .

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 (8)

Cemented carbide cement concrete composition,
Initial strength expression material 3 to 50% by weight, fine aggregate 5 to 65% by weight, coarse aggregate 3 to 65% by weight, performance expressing agent 0.01 to 30% by weight and water 0.1 to 30% by weight,
The initial strength expression material is 5 to 70% by weight of crude steel Portland cement, 5 to 60% by weight of calcium sulfoaluminate, 1 to 40% by weight of amorphous tricalcium aluminate cement, 1 to 30% by weight of alumina silicate-based senofare, gypsum 0.1 -20 wt%, boron nitride 0.1-20 wt%, zirco aluminate 0.1-20 wt%, germanium 0.01-20 wt%, aluminosilicate 0.01-15 wt%, lithium carbonate 0.01-10 wt%, metaphosphate 0.01- 10 wt%, 0.01-10 wt% lithium disilicate, 0.01-10 wt% potassium chloride, 0.01-10 wt% peat, 0.001-5 wt% reducing agent and 0.01-5 wt% retardant,
The performance expression agent is 30 to 98% by weight of styrene-methyl methacrylate-butylacrylate copolymer, 1 to 25% by weight of alkyl acrylate ester-acrylonitrile copolymer, 0.1 to ethylene-methyl methacrylate-vinyl acetate copolymer -15 weight%, polymethyl acrylate 0.1-15 weight%, polyisobutyl methacrylate copolymer 0.1-15 weight%, polycarboxylic acid water reducing agent 0.1-5 weight%, silicone type antifoamer 0.1-5 weight%, N-alkoxymethyl 0.01 to 10% by weight polyamide and 0.01 to 10% by weight polyethyleneimine,
Slump (cm) by KS F 2402 is 20 to 21 immediately after stirring, 19 to 19.5 after 20 minutes, 14 to 17.5 after 30 minutes, 11 to 15.5 after 40 minutes; Compressive strength (MPa) by KS F 2405 is 30.5-32.5 after 4 hours, 36.5-38.0 after 1 day, 41.0-43.5 after 7 days, 44.0-48.1 after 28 days; Flexural strength (MPa) by KS F 2408 is 5.4 to 5.9 after 4 hours, 5.9 to 6.5 after 1 day, 6.9 to 7.6 after 7 days, and 7.1 to 7.8 after 28 days; Adhesion strength (MPa) by KS F 2762 is 1.6 to 1.66 after 4 hours, 1.68 to 1.78 after 1 day, 1.95 to 2.1 after 7 days, 2.15 to 2.4 after 28 days; Length change rate (%) by KS F 2424 (concrete length change test method) is 0.003 to 0.011; Neutralization depth (mm) by KS F 4042 is 0.09-0.2; Salt penetration resistance (coulombs) by KS F 2711 is from 480 to 590; Freeze thaw resistance (%) by KS F 2456 is from 89 to 92; Wear resistance (mm) by ASTM C 779 is 0.02 to 0.05; According to the Japanese Industrial Standards [Method for testing chemical resistance by solution deposition of concrete], 2% hydrochloric acid, 5% sulfuric acid, and 45% sodium hydroxide aqueous solution was dipped into the test solution for 28 days. (%) Is -0.8 to -0.4 for hydrochloric acid, -0.05 to 0 for sulfuric acid, +0.1 to +0.4 for sodium hydroxide, and the rust prevention rate (%) by KS F 2561 (corrosion inhibitor for reinforced concrete) is 96.3 ~ 97.8 pax
Cemented carbide cement concrete composition, characterized in that.
delete delete delete delete delete delete As road pavement maintenance, reinforcement method,
The concrete structure is degraded due to deterioration of the concrete and the step of removing the asphalt concrete using a road crusher,
Removing the deteriorated area to the lower part by using at least one of the waterjet, a high pressure cleaner, a hand waterjet, a planer, and a shot blast, and then cleaning the vacuumed vehicle with the removed part;
A part of the cemented carbide cement concrete composition is formed on the cleaned area to integrate the cemented carbide cement concrete composition according to claim 1 with the existing concrete slab, to suppress penetration of harmful substances, water and chlorine ions, and to improve adhesion. Applying the performance expression agent;
Pouring the superhard cement cement composition on the top to which the performance-expressing agent is applied to expand and repair and reinforce the cross section of the deteriorated portion;
Performing longitudinal and transverse tanning to prevent slippage of the superhard cement cement composition;
Coating and curing the film curing agent to prevent plastic evaporation by preventing moisture evaporation on the tined cemented carbide cement composition;
Road pavement maintenance, reinforcement method characterized by including.