KR102097111B1 - Rapid hardening cement concrete composition for emergency eepair and a repairing method of road pavement using the same - Google Patents

Abstract

The present invention relates to a rapid hardening cement concrete composition having improved durability, and a method for repairing and reinforcing road pavement using the same. The rapid hardening cement concrete composition includes 3-55 wt% of a rapid hardening strength-expressing material, 5-70 wt% of fine aggregate, 3-60 wt% of coarse aggregate, 0.01-30 wt% of a function-improving agent, and 0.1-30 wt% of water. Particularly, the rapid hardening strength-expressing material includes high early strength Portland cement, calcium sulfoaluminate, calcium ferroaluminate, gypsum, cristobalite, hexafluorophosphate, magnesium silicofluoride, aluminosilicate, strontium aluminate, boron carbide, calcium nitrite, and fine ceramic. In addition, the function-improving agent includes styrene-vinyl acetate copolymer, polyether-ether ketone copolymer, ethylene-vinyl acetate-vinyl alcohol copolymer, polyaminoalkyl methacrylate, polymethylpentene, glutaconic acid, sodium hydride, polycarbonate-based water-reducing agent, and a silicon-based defoaming agent.

Description

Rapid hardening cement concrete composition for emergency eepair and a repairing method of road pavement using the same}

The present invention relates to a cemented carbide composition for emergency repair with improved durability and road pavement repair and reinforcement method using the same.

In recent years, as concrete structures become larger, the importance of maintenance will increase in the future. Currently, repair work is being performed on cracks and damaged parts in various concrete structures, such as underwater structures that require watertightness, as well as roads, water and sewage facilities. The materials used for repair work vary widely, but the most common of these is cement mortar. However, cement mortar has the disadvantages of low strength characteristics, long curing time and large amount of dry shrinkage due to moisture loss. Due to these shortcomings, there are many problems in the use of cement mortar when installing on watertight structures or when rapid construction is required. In order to solve this problem, research on various repair and reinforcement materials using super hard cement has been actively conducted.

In addition, in general, repairing and reinforcing roads, which are premised on traffic blocking of public roads, cause a lot of inconvenience for users along with road congestion, so construction is mainly performed at night or at dawn, when traffic is low. Since it is necessary to open the traffic within 3 to 4 hours afterwards, there is an urgent need for developing cemented carbide, which is widely used for emergency maintenance.

However, the use of superhard cement has several problems in the long term. Concrete using super hard cement is effective for rapid strength development at an early stage, but due to the relatively high hydration heat and drying shrinkage compared to the initial normal curing, shrinkage due to heat and moisture movement in the structure is constrained by internal and external factors. Microcracks are likely to occur. Such microcracks can directly affect the mechanical properties and durability of structures by increasing the permeability in the concrete matrix and inducing various types of destruction, which can seriously affect the stability of structures.

In particular, since the constituent minerals included in the cemented carbide cement composition are vulnerable to water resistance, thawing resistance, and long-term durability, compared to general Portland cement, there is a problem that frequently needs to be repaired even after repair.

Therefore, in recent years, there is an urgent need for a construction method to rapidly maintain pavement of roads or bridges using a super cemented cement concrete composition to minimize traffic congestion and reduce the risk of safety accidents by rapid construction.

Patent Registration Publication No. 10-0943312 (announced on February 19, 2010)

Therefore, the technical problem to be solved in the present invention is to provide a cemented carbide composition for emergency repair with improved durability.

In addition, another technical problem to be solved in the present invention is to provide a road pavement repair and reinforcement method using the super-hard cement concrete composition for emergency repair.

One embodiment of the present invention includes a fast-intensity strength present 3 to 55% by weight, fine aggregate 5 to 70% by weight, coarse aggregate 3 to 60% by weight, functional improvement agent 0.01 to 30% by weight and water 0.1 to 30% by weight, , The fast-intensity strength stiffener is 3 to 75% by weight of crude steel Portland cement, 3 to 65% by weight of calcium sulfoaluminate, 1 to 45% by weight of calcium ferroaluminate, 1 to 30% by weight of plaster, 0.1 to 20% by weight of cristobalite , 0.01 to 10% by weight of hexafluorophosphate, 0.01 to 10% by weight of magnesium fluoride, 0.01 to 10% by weight of aluminosilicate, 0.01 to 10% by weight of strontium aluminate, 0.01 to 10% by weight of boron carbide, 0.01 to 10% by weight of calcium nitrite It comprises 0.01% to 10% by weight and fine ceramics, and the functional improving agent is 30 to 85% by weight of a styrene-vinyl acetate copolymer, and 10 to 55% by weight of a polyether-ether ketone copolymer. , Ethylene-vinyl acetate-vinyl alcohol copolymer 1 to 25% by weight, polymethacrylic acid aminoalkyl ester 1 to 25% by weight, polymethylpentene 0.1 to 15% by weight, glutaconic acid 0.1 to 15% by weight, sodium hydride Provided is an ultra-fast cemented cement concrete composition for emergency repair, comprising 0.1 to 15% by weight, 0.01 to 10% by weight of a polycarboxylic acid-based water reducing agent, and 0.01 to 10% by weight of a silicone antifoaming agent.

The fast-intensity strength developing agent further comprises 0.01 to 10% by weight of amorphous calcium aluminate, 0.01 to 10% by weight of magnesia, 0.01 to 5% by weight of a water reducing agent, and 0.01 to 5% by weight of a retarder, and the functional improvement agent is N- [3- (trimethoxysilyl) propyl] aniline 0.01 to 10% by weight, ammonium noniphenol ether sulfate 0.01 to 10% by weight and dibutyltin diacetate 0.01 to 10% by weight may be further included.

The calcium ferroaluminate contained in the rapid-diameter strength developing agent is composed of CaO-Al ₂ O ₃ -Fe ₂ O ₃ system, the content of Fe ₂ O ₃ is 20 to 30 mass%, and CaO / Al ₂ O The molar ratio of ₃ is 0.3 to 0.7, and the powder degree can be used with a specific surface area of 3,000 to 8,000 cm ² / g.

Another embodiment of the present invention is a road pavement repair and reinforcing method using an ultra-fast cemented concrete composition for emergency repair according to one embodiment of the present invention. Removing the dropped parts or asphalt concrete using a road crusher; Removing the removed part to the lower part of the deteriorated part with a water jet, a high pressure washer, a hand water jet, a planing machine, and a shot blast and cleaning with a vacuum suction vehicle; The urgent maintenance cemented concrete composition improves adhesion to the existing concrete slab, strengthens the surface layer, inhibits penetration of harmful substances, water, and chlorine ions, and applies the functional improvement agent to the cleaned area to improve water resistance. step; Pouring or repairing or reinforcing the cross section of the deteriorated area by pouring the super-hard cement concrete composition for emergency repair on the top of which the function improving agent is applied; Performing vertical and transverse tining to prevent the surface of the cemented concrete composition for emergency repair from being poured; Applying a coating curing agent to prevent plastic cracks by preventing evaporation of moisture on the thinned cemented concrete composition for emergency repair; And it provides a road pavement repair, reinforcement method using a cemented carbide composition for emergency repair, including the step of curing.

According to the present invention, it is possible to improve the workability of concrete by using a super fast-hardness strength developing agent and a functional improving agent, and improve the strength of concrete, in particular, abrasion resistance, impact resistance, corrosion resistance, and prevent cracking and greatly improve durability. You can. In addition, by facilitating the initial hydration of cement and densification of tissues by pozzolanic reaction, it is possible to make dense concrete to improve the strength and durability of concrete. In addition, it is possible to obtain an effect of preventing surface cracks and expansion and destruction by dry shrinkage. On the other hand, all the properties required for packaging, namely, strength, scaling resistance, water tightness, adhesion, durability and crack resistance, etc. can all be satisfied.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of claims to be described later.

The present invention is a fast speed for urgent maintenance, including 3 to 55% by weight, 5 to 70% by weight of fine aggregate, 3 to 60% by weight of coarse aggregate, 0.01 to 30% by weight of functional improving agent, and 0.1 to 30% by weight of water. It relates to a light cement concrete composition.

Aggregates used in the present invention are divided into fine aggregates and coarse aggregates, and those having a particle size of 5 mm or less are referred to as fine aggregates, and those having a particle size greater than 5 mm are classified into coarse aggregates. The fine aggregate preferably contains 5 to 70% by weight in the cemented concrete composition for emergency repair of the present invention, and the coarse aggregate preferably contains 3 to 60% by weight in the cemented carbide composition for emergency repair of the present invention. .

The fast-intensity strength developing agent is 3 to 75% by weight of crude steel Portland cement, 3 to 65% by weight of calcium sulfoaluminate, 1 to 45% by weight of calcium ferroaluminate, 1 to 30% by weight of plaster, 0.1 to 20% by weight of cristobalite, Hexafluor phosphate 0.01 to 10 wt%, magnesium fluoride 0.01 to 10 wt%, aluminosilicate 0.01 to 10 wt%, strontium aluminate 0.01 to 10 wt%, boron carbide 0.01 to 10 wt%, calcium nitrite 0.01 to 10 wt% % And fine ceramic 0.01 to 10% by weight.

It is preferable to use the crude steel Portland cement specified in KS, and by using a powder having a 4000 to 9000 cm ² / g powder, excellent initial strength development and workability can be provided, and crack generation can be suppressed. It has an effect. It is preferable that the crude steel Portland cement is contained in an amount of 3 to 75% by weight relative to the rapid-diameter strength developer. If the content of the crude steel Portland cement is too small, the effect of inhibiting the initial strength of concrete and cracking may be weak, and when the content of the crude Portland cement is too large, early strength development is excellent, but workability becomes poor, or manufacturing cost There is a problem that is not economical to increase.

The calcium sulfoaluminate is an inorganic superhard material, and when mixed with cement, it is possible to obtain the compressive strength of ordinary Portland cement obtained in days or even days within hours. The calcium sulfoaluminate is mixed with other components of the rapid-strength strength-developing agent to obtain the effect of initial strength development and durability performance expression. It is preferable that the calcium sulfoaluminate is contained in an amount of 3 to 65% by weight with respect to the rapid-intensity strength developing agent. If the content of the calcium sulfoaluminate is too small, the effect of expressing the initial strength and durability of the concrete may be weak, and if the content of the calcium sulfoaluminate is too large, the initial strength expression is excellent but the workability is poor or However, there is a problem that the manufacturing cost is high, which is not economical.

The calcium ferro aluminate is mixed with the other components of the rapid-strength strength development, it is possible to obtain the effect of initial strength development and durability performance expression. In particular, anti-rust and self-healing effects can be obtained. It is preferable that the calcium ferroaluminate is contained in an amount of 1 to 45% by weight relative to the rapid-diameter strength developing agent. If the content of the calcium ferro aluminate is too small, the above-described effect may be weak, and if the content of the calcium ferro aluminate is too large, the workability becomes poor or the manufacturing cost is high, which is not economical.

The calcium ferroaluminate is composed of CaO-Al ₂ O ₃ -Fe ₂ O ₃ system, the content of Fe ₂ O ₃ is 20 to 30 mass%, and the molar ratio of CaO / Al ₂ O ₃ is 0.3 to 0.7. It is possible to further improve the above-described effect by using a powder having a specific surface area of 3,000 to 8,000 cm ² / g.

The gypsum is mixed with other components of the rapid-strength strength-developing agent, so that an initial strength development and shrinkage prevention effect can be obtained. In addition, the gypsum has an effect that can prevent the crack of the concrete by compacting the texture and shrinkage of the concrete. The gypsum may be anhydrous gypsum or Isu gypsum. It is preferable that the gypsum is contained in an amount of 1 to 30% by weight relative to the rapid-hardening strength developer. If the content of the gypsum is too small, the initial strength of concrete and the effect of inhibiting cracking may be weak, and if the content of the gypsum is too large, good physical properties may be obtained due to rapid curing properties, but overexpansion or water resistance may deteriorate. There is a problem that can be.

 The cristobalite is mixed with the other components of the fast-intensity strength developing agent to increase the strength of concrete by the effect of increasing strength by hydration reaction, filling effect, and effect by pozzolanic reaction under curing conditions of high temperature or high pressure. You can. In particular, it is possible to provide an excellent anti-cracking effect. The cristobalite is preferably contained in an amount of 0.1 to 20% by weight with respect to the rapid-diameter strength developer. If the content of the cristobalite is too small, the above-described effect may be weak, and if the content of the cristobalite is too large, there is a problem that the workability is poor or the manufacturing cost is high, which is not economical.

The hexafluor phosphate is mixed with the other components of the rapid-hardening strength developer, thereby controlling the initial cure rate and improving the chemical resistance and abrasion resistance. It is preferable that the hexafluor phosphate is contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. If the content of the hexafluoro phosphate is too small, the above-described effect may be weak, and if the content of the hexafluoro phosphate is too large, the curing rate is too slow, resulting in poor workability or high manufacturing cost, which is not economical. There is this.

The magnesium fluoride is mixed with the other components of the rapid-strength strength-developing agent, thereby increasing reactivity to obtain an effect of further improving early strength. The magnesium fluoride is preferably contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. When the content of the magnesium fluoride is too small, the above-described effect may be weak, and when the content of the magnesium fluoride is too large, workability may be poor or manufacturing cost may be high, which is not economical.

The aluminosilicate may be mixed with other components of the rapid-diameter strength developing agent to obtain initial strength development, abrasion resistance, heat resistance, and shrinkage prevention effects. The aluminosilicate is preferably contained in an amount of 0.01 to 10% by weight relative to the rapid-diameter strength developing agent. When the content of the aluminosilicate is too small, the above-described effect may be weak, and when the content of the aluminosilicate is too large, good physical properties may be obtained due to rapid curing properties, but manufacturing cost is high, which is not economical. There is this.

The strontium aluminate is mixed with the other components of the rapid-strength strength developing agent to obtain an effect of more easily controlling the initial curing rate. The strontium aluminate is preferably contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. If the content of the strontium aluminate is too small, initial strength expression may be delayed, and when the content of the strontium aluminate is too large, excessively high reactivity may result in deterioration of workability and high manufacturing cost, which is not economical. There is a problem.

The boron carbide is mixed with other components of the rapid-hardening strength developing agent, thereby obtaining an effect of improving strength, abrasion resistance, and impact resistance. It is preferable that the boron carbide is contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. If the content of the boron carbide is too small, the above-mentioned improvement effect may be weak, and if the content of the boron carbide is too large, workability may be deteriorated, and manufacturing cost may be high, which is not economical.

The calcium nitrite is mixed with the other components of the fast-intensity strength developing agent, thereby obtaining a waterproof, anti-rust and shrinkage reduction effect. It is preferable that the calcium nitrite is contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. If the content of the calcium nitrite is too small, the above-mentioned improvement effect may be weak, and if the content of the calcium nitrite is too large, the manufacturing cost is high, which is not economical or there is a problem that workability may be deteriorated.

The fine ceramics are mixed with other components of the rapid-hardening strength developing agent to obtain an effect of improving abrasion resistance, corrosion resistance, chemical resistance, and heat resistance. It is preferable that the fine ceramic is contained in an amount of 0.01 to 10% by weight based on the rapid-diameter strength development. If the content of the fine ceramic is too small, the above-mentioned improvement effect may be weak, and if the content of the fine ceramic is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated.

These fine ceramics are mixed with a conventional fine ceramic powder containing a zirconium carbide (ZrC) and tungsten carbide (WC) in a weight ratio of 1: 2 with a surfactant, followed by drying and sintering, to a size of 100 μm to 200 μm. The above-described effect can be further improved by using a product having a double pore structure in which primary pores, which are waste pores in the range, and secondary pores, which are open pores in a size range of 1 μm to 50 μm, are formed.

More specifically, after mixing zirconium carbide (ZrC) and tungsten carbide (WC) at a weight ratio of 1: 2, 100 parts by weight of the composite powder, 10 to 30 parts by weight of surfactant and 150 to 300 parts by weight of water, The pH is adjusted to a range of 5 to 11 with a pH adjusting agent. At this time, it is preferable to use an aqueous HCl solution or an aqueous NaOH solution. In addition, it is preferable to use a cationic surfactant as the surfactant. More specifically, the cationic surfactant may be one or more selected from the group consisting of amine salts, quaternary ammonium salts, sulfonium salts, phosphonium salts, and mixtures thereof. Thereafter, the mixture is dried at 25 to 50 ° C. for 20 to 30 hours, and then the dried product is calcined at 1500 to 1700 ° C. for 1.5 to 3 hours to further improve the above-described effect.

The fast-intensity strength developing agent may further include amorphous calcium aluminate. The amorphous calcium aluminate is mixed with other components of the rapid-strength strength developing agent, so as to impart rapid curing properties. It is preferable that the amorphous calcium aluminate is contained in an amount of 0.01 to 10% by weight relative to the rapid-diameter strength developing agent. When the content of the amorphous calcium aluminate is too small, the above-mentioned improvement effect may be weak, and when the content of the amorphous calcium aluminate is too large, early strength expression is excellent, but workability is lowered or manufacturing cost is high, which is economical. There is an unsuccessful problem. More specifically, it is preferable that the amorphous calcium aluminate is made by mixing alumina and quicklime to melt and quench them. More specifically, the amorphous calcium aluminate is a melting step of melting alumina and quicklime to 1300 to 1500 ° C; A quenching step of quenching the molten alumina and quicklime by spraying water; The crushing step of crushing the lump of the amorphous calcium aluminate solidified by the quenching step; using the one prepared by the manufacturing method comprising, it is possible to further improve the above effects.

The fast-intensity strength generator may further include magnesia. The magnesia is mixed with the other components of the rapid-hardening strength developing agent to accelerate curing, improve strength, prevent cracking, and obtain an effect of corrosion resistance, fire resistance, and wear resistance. The magnesia is preferably contained in an amount of 0.01 to 10% by weight with respect to the fast-intensity strength developing agent. If the content of the magnesia is too small, the above-mentioned improvement effect may be weak, and if the content of the magnesia is too large, a problem that initial strength expression is lowered may occur. The magnesia may further improve the above-described effect by using a powder having a degree of 2000 to 5000 cm ² / g. In addition, the magnesia is magnesium carbonate (MgCO ₃ ) or dolomite (CaMg (CO ₃ ) ₂ ) by firing at 1450 ℃ or higher activity (Activity) to lower the activity (Activity) and dead burnt magnesia (dead burnt magnesia) and; The magnesia is a mixture of light and small magnesia or active magnesia calcined in a range of 1000 to 1300 ° C with magnesium carbonate (MgCO ₃ ) or dolomite (CaMg (CO ₃ ) ₂ ) at a weight ratio of 1: 4, while ensuring working time. , The effect that can express the initial strength is further improved.

The fast-intensity strength developing agent may further include a water reducing agent. The water reducing agent may be mixed with other components of the rapid-strength strength developing agent to reduce the water-cement ratio, thereby obtaining an effect of further improving strength and durability. The water reducing agent may be a polycarboxylic acid-based, melamine-based, aminosulfonic acid-based or naphthalene-based water-reducing agent. In particular, it is preferable to use a naphthalene-based water reducing agent that is excellent in improving the strength and durability, and has an excellent effect of reducing the water-cement ratio, by mixing with other components of the rapid-hardening strength developing agent. It is preferable that the water reducing agent is contained in an amount of 0.01 to 5% by weight with respect to the rapid-strength strength developing agent. If the content of the water reducing agent is too small, the above-mentioned improvement effect may be weak, and if the content of the water reducing agent is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated.

The fast-intensity strength developing agent may further include a retarding agent. The retarder is mixed with other components of the fast-intensity strength developing agent, and can be used to secure workability for a certain period of time and delay rapid curing. The retarder may be a material generally well known in the art, for example, sugars such as glucose, glucose, textrin, dextran, acids such as gluconic acid, malic acid, citric acid, or salts thereof, aminocarboxylic acids Alternatively, salts thereof, phosphonic acid or derivatives thereof, polyalcohols such as glycerin, and the like can be used. It is preferable that the retarder is contained in an amount of 0.01 to 5% by weight with respect to the rapid-intensity strength developing agent. If the content of the retarder is too small, the above-mentioned improvement effect may be weak, and if the content of the retarder is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated.

The fast-intensity strength developing agent further comprises 0.01 to 10% by weight of amorphous calcium aluminate, 0.01 to 10% by weight of magnesia, 0.01 to 5% by weight of a water reducing agent, and 0.01 to 5% by weight of a retarder, further improving the above-mentioned effect. You can.

It is preferable that the functional improving agent is contained in an amount of 0.01 to 30% by weight in the cemented concrete composition for emergency repair. If the content of the functional improver is too small, the effect of improving curing time, workability, strength and durability may be weak, and if the content of the functional improver is too large, the viscosity of the ultra-fast cemented concrete composition for urgent maintenance is lowered and workability ( Slump) is good, but material separation is likely to occur, and the hydration reaction is delayed to decrease the initial compressive strength and at the same time, the price competitiveness may be lowered.

The functional improving agent is 30 to 85% by weight of styrene-vinyl acetate copolymer, 10 to 55% by weight of polyether-ether ketone copolymer, 1 to 25% by weight of ethylene-vinyl acetate-vinyl alcohol copolymer, aminoalkyl polymethacrylate 1 to 25% by weight of ester, 0.1 to 15% by weight of polymethylpentene, 0.1 to 15% by weight of glutaconic acid, 0.1 to 15% by weight of sodium hydride, 0.01 to 10% by weight of polycarboxylic acid-based water reducing agent, and 0.01 to 10% of silicone type antifoaming agent %.

The styrene-vinyl acetate copolymer is mixed with other components of the functional improving agent, inducing a bond between the rapid-hardening strength developing agent and the functional improving agent, and can obtain an effect of improving strength and durability. It is preferable that the styrene-vinyl acetate copolymer is contained in an amount of 30 to 85% by weight with respect to the functional improving agent. If the content of the styrene-vinyl acetate copolymer is too small, the effect of inducing bonds between the rapid-hardening strength-developing liver and the effect of improving durability such as strength, salt resistance and freeze-thaw resistance may be weak, and the styrene -If the content of the vinyl acetate copolymer is too large, it is difficult to expect the effect of inducing bonds between the fast-diameter strength development and the effect of improving the strength and durability, and there is a problem in that the manufacturing cost is high, which is not economical.

The polyether-ether ketone copolymer may be mixed with other components of the functional improving agent to obtain an effect of improving toughness, adhesion strength, heat resistance, flame retardancy and chemical resistance. In particular, the polyether-ether ketone copolymer has a high melting point compared to a general synthetic resin, and thus has excellent flame retardancy, so that mortar does not need to further include a separate flame retardant, and improves chemical resistance by the properties of aromatic polymers. Have It is preferable that the polyether-ether ketone copolymer is contained in an amount of 10 to 55% by weight with respect to the functional improving agent. If the content of the polyether-ether ketone copolymer is too small, the effect of improving the toughness, adhesion strength, heat resistance, flame retardancy and chemical resistance may be weak, and if the content of the polyether-ether ketone copolymer is too large , There is a problem that the viscosity increases and the workability (slump) may decrease.

The ethylene-vinyl acetate-vinyl alcohol copolymer is mixed with other components of the functional improving agent to obtain an effect of improving strength, adhesion, and durability. The ethylene-vinyl acetate-vinyl alcohol copolymer is preferably contained in an amount of 1 to 25% by weight with respect to the functional improving agent. If the content of the ethylene-vinyl acetate-vinyl alcohol copolymer is too small, the above-mentioned improvement effect may be weak, and if the content of the ethylene-vinyl acetate-vinyl alcohol copolymer is too large, a further improvement effect can be expected. It can be difficult, there is a problem that the viscosity is high and the workability can be lowered.

The polymethacrylic acid aminoalkyl ester may be mixed with other components of the functional improving agent to obtain an effect of improving strength, corrosion resistance, water resistance, fouling resistance and workability. It is preferable that the polymethacrylic acid aminoalkyl ester is contained in an amount of 1 to 25% by weight with respect to the functional improving agent. If the content of the polymethacrylic acid aminoalkyl ester is too small, the above-mentioned improvement effect may be weak, and if the content of the polymethacrylic acid aminoalkyl ester is too large, it may be difficult to expect further improvement effects, There is a problem that workability may be deteriorated.

The polymethylpentene may be mixed with other components of the functional improving agent to obtain an effect of improving strength, chemical resistance, corrosion resistance and heat resistance. It is preferable that the polymethylpentene is contained in an amount of 0.1 to 15% by weight with respect to the functional improvement agent. If the content of the polymethylpentene is too small, the above-mentioned improvement effect may be weak, and if the content of the polymethylpentene is too large, the performance is improved, but the manufacturing cost is high, which is not economical.

The glutaconic acid is mixed with other components of the functional improving agent, it is possible to obtain the effect of improving the adhesion and chemical resistance. It is preferable that the glutaconic acid is contained in an amount of 0.1 to 15% by weight with respect to the functional improvement agent. If the content of the glutaconic acid is too small, the above-mentioned improvement effect may be weak, and if the content of the glutaconic acid is too large, the viscosity may be increased and workability may be reduced, and the manufacturing cost may be high, which is not economical. There is this.

The sodium hydride is mixed with other components of the functional improving agent to improve the curing reactivity of the cement, thereby obtaining an effect of improving chemical resistance and water resistance. It is preferable that the sodium hydride is contained in an amount of 0.1 to 15% by weight with respect to the functional improving agent. If the content of the sodium hydride is too small, the above-mentioned improvement effect may be weak, and if the content of the sodium hydride is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated. .

The polycarboxylic acid-based water reducing agent is mixed with other components of the functional improving agent, thereby improving the strength and durability by reducing the water-cement ratio, and at the same time delaying the hydration reaction of cement to obtain an effect of further improving the initial workability. . It is preferable that the polycarboxylic acid-based water reducing agent is contained in an amount of 0.01 to 10% by weight relative to the functional improving agent. If the content of the polycarboxylic acid-based water reducing agent is too small, the above-mentioned improvement effect may be weak, and if the content of the polycarboxylic acid-based water reducing agent is too large, the manufacturing cost may be high, which is not economical or workability may be deteriorated. There is a problem.

The silicone antifoaming agent is mixed with other components of the functional improving agent, thereby reducing the amount of air and lowering the voids, thereby obtaining an effect of further improving strength and durability. It is preferable that the silicone antifoaming agent is contained in an amount of 0.01 to 10% by weight relative to the functional improving agent. If the content of the silicone-based antifoaming agent is too small, the above-mentioned improvement effect may be weak, and if the content of the silicone-based antifoaming agent is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated.

The functional improving agent may further include N- [3- (trimethoxy silyl) propyl] aniline. The N- [3- (trimethoxy silyl) propyl] aniline is mixed with other components of the functional improving agent to improve reactivity, thereby obtaining an effect of further improving strength and durability. The N- [3- (trimethoxy silyl) propyl] aniline is preferably contained in an amount of 0.01 to 10% by weight relative to the functional improvement agent. If the content of the N- [3- (trimethoxy silyl) propyl] aniline is too small, the above-mentioned improvement effect may be weak, and the content of the N- [3- (trimethoxy silyl) propyl] aniline If too many, there is a problem that excessively high reactivity, the workability may be reduced.

The functional improving agent may further include ammonium noniphenol ether sulfate. The ammonium noniphenol ether sulfate may be mixed with other components of the functional improving agent to obtain an effect of further improving strength, filling properties and durability. The ammonium noniphenol ether sulfate is preferably contained in an amount of 0.01 to 10% by weight relative to the functional improving agent. When the content of the ammonium noniphenol ether sulfate is too small, the above-mentioned improvement effect may be weak, and when the content of the ammonium noniphenol ether sulfate is too large, there is a problem that workability may be deteriorated.

The functional improvement agent may further include dibutyltin diacetate. The dibutyltin diacetate is mixed with other components of the functional improving agent to obtain an effect of more easily controlling the initial curing rate. The dibutyltin diacetate is preferably contained in an amount of 0.01 to 10% by weight relative to the functional improvement agent. If the content of the dibutyltin diacetate is too small, the above-mentioned improvement effect may be weak, and if the content of the dibutyltin diacetate is too large, the manufacturing cost may be high and thus economical or workability may be deteriorated. There is a problem.

The functional improvement agent further comprises 0.01 to 10% by weight of N- [3- (trimethoxysilyl) propyl] aniline, 0.01 to 10% by weight of ammonium noniphenol ether sulfate and 0.01 to 10% by weight of dibutyltin diacetate, The above-described effect can be further improved.

Super fast cement cement concrete composition for emergency repair according to a preferred embodiment of the present invention is 3 to 55% by weight of the fast-intensity strength development, 5 to 70% by weight of fine aggregate and 3 to 60% by weight of coarse aggregate, a forced mixer or continuous type After stirring in a mixer, 0.01 to 30% by weight of a functional improving agent and 0.1 to 30% by weight of water may be further mixed to be prepared by stirring for a predetermined time (for example, 1 to 10 minutes).

Hereinafter, a road pavement repair and reinforcement method using an ultra-fast cemented concrete composition for emergency repair according to a preferred embodiment of the present invention will be described.

Another embodiment of the present invention is a road pavement repair and reinforcing method using an ultra-fast cemented concrete composition for emergency repair according to one embodiment of the present invention. Removing the dropped parts or asphalt concrete using a road crusher; Removing the removed part to the lower part of the deteriorated part with a water jet, a high pressure washer, a hand water jet, a planing machine, and a shot blast and cleaning with a vacuum suction vehicle; The urgent maintenance cemented concrete composition improves adhesion to the existing concrete slab, strengthens the surface layer, inhibits penetration of harmful substances, water, and chlorine ions, and applies the functional improvement agent to the cleaned area to improve water resistance. step; Pouring or repairing or reinforcing the cross section of the deteriorated area by pouring the super-hard cement concrete composition for emergency repair on the top of which the function improving agent is applied; Performing vertical and transverse tining to prevent the surface of the cemented concrete composition for emergency repair from being poured; Applying a coating curing agent to prevent plastic cracks by preventing evaporation of moisture on the thinned cemented concrete composition for emergency repair; And it provides a road pavement repair, reinforcement method using a cemented carbide composition for emergency repair, including the step of curing.

The deterioration site may further include removing the rust of the exposed rebar before removing the reinforcing bar and applying the functional improvement agent. In the case of chipping using the crusher and water jet, the reinforcing bar of the concrete structure is not exposed in the normal case, but in the case of severe deterioration, the reinforcing bar may be exposed in the deteriorated area. According to the invention, there is no need to perform a separate reinforcing bar rust treatment.

According to the present invention, it is possible to improve the workability of concrete by using a super fast-hardness strength developing agent and a functional improving agent, and improve the strength of concrete, in particular, abrasion resistance, impact resistance, corrosion resistance, and prevent cracking and greatly improve durability. You can. In addition, by facilitating the initial hydration of cement and densification of tissues by pozzolanic reaction, it is possible to make dense concrete to improve the strength and durability of concrete. In addition, it is possible to obtain an effect of preventing surface cracks and expansion and destruction by dry shrinkage. On the other hand, all the properties required for packaging, namely, strength, scaling resistance, water tightness, adhesion, durability and crack resistance, etc. can all be satisfied. In particular, it is possible to greatly improve the water resistance and rust resistance.

Hereinafter, embodiments of the superhard cemented concrete composition for emergency repair according to the present invention are presented in more detail, and the present invention is not limited by the following examples.

<Example 1>

Portland cement 29kg, calcium sulfoaluminate 30kg, calcium ferroaluminate 15kg, gypsum 7kg, cristobalite 3kg, hexafluorophosphate 3kg, magnesium fluoride 2kg, aluminosilicate 3kg, strontium aluminate 2kg, boron 2kg calcium, 1kg calcium nitrite And 3 kg of fine ceramics were mixed to obtain 100 kg of fast-diameter strength development.

Styrene-vinyl acetate copolymer 42kg, polyether-ether ketone copolymer 22kg, ethylene-vinyl acetate-vinyl alcohol copolymer 20kg, polymethacrylic acid aminoalkyl ester 9kg, polymethylpentene 5kg, glutaconic acid 1kg, sodium hydride 0.9 kg of the polycarboxylic acid-based water reducing agent and 0.05 kg of the silicone-based antifoaming agent were mixed to obtain a functional improvement agent of 100 kg.

For the purpose of the present invention, 25 kg of the early strength improvement mixture obtained above, 35 kg of fine aggregate, and 30 kg of coarse aggregate were added to a forced mixer, followed by stirring, followed by further mixing 6 kg of the performance improving admixture obtained above and 4 kg of water, followed by stirring for 2 minutes. To prepare an emergency repair super fast cement cement concrete composition 100kg.

<Example 2>

Portland cement 38kg, calcium sulfoaluminate 30kg, calcium ferroaluminate 10kg, gypsum 7kg, cristobalite 3kg, hexafluorophosphate 1kg, magnesium fluoride 1kg, aluminosilicate 1kg, strontium aluminate 2kg, boron carbide 0.5kg kg, fine ceramic 3 kg, amorphous calcium aluminate 1 kg, magnesia 0.5 kg, naphthalene-based water reducing agent 0.5 kg and citric acid-based retarding agent 0.5 kg were mixed to obtain a rapid-diameter strength development 100 kg.

At this time, the calcium ferro aluminate is made of CaO-Al ₂ O ₃ -Fe ₂ O ₃ system, the content of Fe ₂ O ₃ is 5.3% by mass, the molar ratio of CaO / Al ₂ O ₃ is 2, powder The figure used was a specific surface area of about 4356 cm ² / g.

In addition, the amorphous calcium aluminate was quenched by melting alumina and quicklime to about 1500 ° C, and spraying water on the molten alumina and quicklime. The crushed amorphous calcium aluminate mass hardened by the quenching step was used.

In addition, the magnesia was used to have a powderiness of about 3269 cm ² / g, and the magnesia was calcined with magnesium carbonate (MgCO ₃ ) and dolomite (CaMg (CO ₃ ) ₂ ) at about 1500 ° C. to obtain activity. Dead burnt magnesia; For the magnesia, a mixture of light magnesia or active magnesia calcined at about 1050 ° C. with magnesium carbonate (MgCO ₃ ) and dolomite (CaMg (CO ₃ ) ₂ ) at a ratio of 1: 1 was used.

Styrene-vinyl acetate copolymer 39kg, polyether-etherketone copolymer 21kg, ethylene-vinyl acetate-vinyl alcohol copolymer 15kg, polymethacrylic acid aminoalkyl ester 10kg, polymethylpentene 8kg, glutaconic acid 2kg, sodium hydride 0.9kg, 0.05kg of polycarboxylic acid water reducing agent, 0.05kg of silicone antifoaming agent, 1.5kg of N- [3- (trimethoxysilyl) propyl] aniline, 1.5kg of ammonium noniphenol ether sulfate and 1kg of dibutyltin diacetate, 100 kg of functional improvement agent was obtained.

For the purpose of the present invention, 35 kg of the early strength improvement mixture obtained above, 22 kg of fine aggregate, and 35 kg of coarse aggregate were added to the forced mixer, followed by stirring, followed by further mixing 6 kg of the performance improving admixture obtained above and 2 kg of water, followed by stirring for 2 minutes. To prepare an emergency repair super fast cement cement concrete composition 100kg.

<Example 3>

Portland cement 38kg, calcium sulfoaluminate 27kg, calcium ferroaluminate 18kg, gypsum 7kg, cristobalite 1.5kg, hexafluorophosphate 1kg, magnesium fluoride 1kg, aluminosilicate 1kg, strontium aluminate 0.5kg, boron carbide 1kg, nitrite 0.5 kg of calcium, 1 kg of fine ceramic, 1 kg of amorphous calcium aluminate, 0.5 kg of magnesia, 0.5 kg of naphthalene-based water reducing agent and 0.5 kg of citric acid-based retarding agent were mixed to obtain 100 kg of fast-diameter strength development.

At this time, the calcium ferro aluminate is made of CaO-Al ₂ O ₃ -Fe ₂ O ₃ system, the content of Fe ₂ O ₃ is 26.2% by mass, the molar ratio of CaO / Al ₂ O ₃ is 0.5, powder The figure used was a specific surface area of about 6252 cm ² / g.

In addition, the amorphous calcium aluminate was quenched by melting alumina and quicklime to about 1500 ° C, and spraying water on the molten alumina and quicklime. The crushed amorphous calcium aluminate mass hardened by the quenching step was used.

In addition, the magnesia was used to have a powderiness of about 3269 cm ² / g, and the magnesia was calcined with magnesium carbonate (MgCO ₃ ) and dolomite (CaMg (CO ₃ ) ₂ ) at about 1500 ° C. to obtain activity. Dead burnt magnesia; For the magnesia, a mixture of light magnesia or active magnesia calcined at about 1050 ° C. with magnesium carbonate (MgCO ₃ ) and dolomite (CaMg (CO ₃ ) ₂ ) at a ratio of 1: 4 was used.

Styrene-vinyl acetate copolymer 45kg, polyether-etherketone copolymer 25kg, ethylene-vinyl acetate-vinyl alcohol copolymer 11kg, polymethacrylic acid aminoalkyl ester 9kg, polymethylpentene 3kg, glutaconic acid 2kg, sodium hydride 0.9kg, 0.05kg of polycarboxylic acid water reducing agent, 0.05kg of silicone antifoaming agent, 1.5kg of N- [3- (trimethoxysilyl) propyl] aniline, 1.5kg of ammonium noniphenol ether sulfate and 1kg of dibutyltin diacetate, 100 kg of functional improvement agent was obtained.

For the purpose of the present invention, 35 kg of the early strength improvement mixture obtained above, 22 kg of fine aggregate, and 35 kg of coarse aggregate were added to the forced mixer, followed by stirring, followed by further mixing 6 kg of the performance improving admixture obtained above and 2 kg of water, followed by stirring for 2 minutes. To prepare an emergency repair super fast cement cement concrete composition 100kg.

<Comparative Example 1>

30 kg of crude steel Portland cement, 30 kg of fine aggregate, and 30 kg of coarse aggregate were added into a forced mixer, followed by stirring, followed by mixing 7 kg of styrene-vinyl acetate copolymer obtained above and 3 kg of water for another 2 minutes and stirring for 2 minutes. It was prepared.

The following test examples show experimental results comparing the characteristics of Examples 1 and 3 according to the present invention so that the characteristics of Examples 1 to 3 according to the present invention can be more easily grasped.

<Test Example 1>

The results of the slump test (degree of kneading) of the ultra-fast cemented concrete composition for emergency repairs prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 according to the method specified in KS F 2402 It is shown. The slump test is to test the consistency of the dough such as the softness and consistency of concrete, and the larger the value, the better the workability, that is, the workability is excellent 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 20.5 16 12 Example 2 21 20.5 17 14.5 Example 3 21 20.5 19 17 Comparative Example 1 21 16 10.5 7

As shown in Table 1, the super-rapid cement concrete composition for emergency repair prepared according to Examples 1 to 3 is superior in workability to the cement concrete composition prepared according to Comparative Example 1, in particular, Example 3 It was confirmed that the super-hard cement concrete composition for emergency repair prepared according to the workability is very excellent because the slump does not change significantly over time.

<Test Example 2>

It shows the results of the compression strength test according to the method specified in KS F 2405 for the super-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1.

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

division Compressive strength (MPa) 4 hours later 1 day later 7 days later 28 days later Example 1 32.7 38.8 43.5 47.2 Example 2 33.7 39.1 44.6 49.5 Example 3 34.8 42.8 47.2 50.1 Comparative Example 1 27.5 32.1 39.1 41

As shown in Table 2, it can be seen that the emergency repair superhard cement concrete compositions prepared according to Examples 1 to 3 were significantly higher in compressive strength than the cement concrete compositions prepared according to Comparative Example 1.

<Test Example 3>

It shows the results of measuring the flexural strength according to the method specified in KS F 2408 for the cemented concrete composition prepared according to Comparative Example 1 and the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3.

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

division Flexural strength (MPa) 4 hours later 1 day later 7 days later 28 days later Example 1 5.8 6.5 7.4 7.9 Example 2 6.0 6.9 7.7 8.8 Example 3 6.1 7.2 8.6 8.8 Comparative Example 1 4.5 5.1 5.8 6.9

As shown in Table 3, it was confirmed that the super-hard cement concrete composition for emergency repair prepared according to Examples 1 to 3 was significantly higher in flexural strength than the cement concrete composition prepared according to Comparative Example 1.

<Test Example 4>

The adhesive strength was measured according to the method prescribed in KS F 2762 for the super-fast cemented concrete composition for emergency repairs prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1, and the results It is shown in Table 4.

division Adhesive strength (MPa) 4 hours later 1 day later 7 days later 28 days later Example 1 1.70 1.80 1.95 2.15 Example 2 1.75 1.95 2.15 2.30 Example 3 1.81 1.85 2.25 2.45 Comparative Example 1 0.95 1.10 1.28 1.50

As shown in Table 4, it was confirmed that the cemented concrete composition for emergency repair 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 rate of change of the length of the cemented concrete composition for emergency repair prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 was measured by KS F 2424 (Test method for changing length of concrete), The results are shown in Table 5 below.

Example 1 Example 2 Example 3 Comparative Example 1 Length change rate (%) 0.015 0.007 0.001 0.024

As shown in Table 5, the cemented concrete composition for emergency repair prepared according to Examples 1 to 3 is reduced in length change rate compared to the cement concrete composition prepared according to Comparative Example 1, thereby reducing shrinkage. Could confirm.

<Test Example 6>

The superfast cement cement composition for emergency repair prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were tested for salt penetration resistance by KS F 2711, and the results are shown in Table 6 below. It is shown in.

Example 1 Example 2 Example 3 Comparative Example 1 Salt penetration resistance (coulombs) 585 486 362 724

As shown in Table 6, it can be confirmed that the cemented concrete composition for emergency repair prepared according to Examples 1 to 3 is higher in resistance to salt penetration than the cement concrete composition prepared according to Comparative Example 1 there was.

<Test Example 7>

Freeze-thaw resistance test was carried out according to the method prescribed in KS F 2456 for the cemented concrete composition prepared according to Comparative Example 1 and the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3, and the result It is shown in Table 8 below.

Example 1 Example 2 Example 3 Comparative Example 1 Freeze-thaw resistance (%) 86 91 93 78

As shown in Table 8 above, it was confirmed that the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3 was superior in freeze-thaw resistance compared to the cement concrete composition prepared according to Comparative Example 1.

<Test Example 8>

Scaling resistance test was carried out according to the method prescribed in the method of SS 13 72 44 A for the cemented concrete composition prepared according to Comparative Example 1 and the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3 , The results are shown in Table 8 below.

Example 1 Example 2 Example 3 Comparative Example 1 Scaling resistance fitness fitness fitness fitness

As shown in Table 8 above, the cemented concrete composition for emergency repair prepared according to Examples 1 to 3 was judged to be a suitable grade for all cement concrete compositions prepared according to Comparative Example 1.

<Test Example 9>

An abrasion resistance test was carried out according to the method specified in ASTM C 779 for the cemented concrete composition prepared according to Comparative Example 1 and the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3. It is shown in Table 9 below.

Example 1 Example 2 Example 3 Comparative Example 1 Abrasion resistance (mm) 0.05 0.042 0.026 0.12

As shown in Table 9, it was confirmed that the cemented concrete composition for emergency repair prepared according to Examples 1 to 3 was superior to the cement concrete composition prepared according to Comparative Example 1.

<Test Example 10>

The ultra-fast cemented concrete composition for emergency repairs prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1 were prepared in accordance with Japanese Industrial Standards [Method for Testing Chemical Resistance by Depositing Concrete] The aqueous solution of% hydrochloric acid, 5% sulfuric acid, and 45% sodium hydroxide was immersed in a test solution for 28 days, and the measurement 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 -0.5 -0.2 -1.5 Sulfuric acid -0.02 -0.01 0 -0.07 Sodium hydroxide +0.05 +0.07 +0.1 +0.1

As shown in Table 10 above, the rapid maintenance cement concrete composition for emergency repair prepared according to Examples 1 to 3 shows less weight change rate for chemical resistance than the cement concrete composition prepared according to Comparative Example 1 It was confirmed that the resistance to chemical resistance was high.

<Test Example 11>

In order to compare the properties of the ultra-fast cemented concrete composition for emergency repair prepared according to Examples 1 to 3 and the cement concrete composition prepared according to Comparative Example 1, the rust prevention rate by KS F 2561 (rust inhibitor for reinforced concrete) The test was carried out and the results are shown in Table 11 below.

Test Items Example 1 Example 2 Example 3 Comparative Example 1 Anti-rust rate (%) 96.6 97.1 98.8 94.1

As shown in Table 11 above, the ultra-fast cemented concrete composition for emergency repairs prepared according to Examples 1 to 3 has a lower rust rate than the cement concrete composition prepared according to Comparative Example 1, and has a high rust prevention effect. Could confirm.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, the embodiments described above are all illustrative and should be understood as not limiting. The scope of the present invention should be construed to include all modified or modified forms derived from the equivalent concept and meaning and scope of the claims, which will be described later, rather than the detailed description.

Claims (4)

The fast-intensity strength development current includes 3 to 55% by weight, fine aggregate 5 to 70% by weight, coarse aggregate 3 to 60% by weight, functional improvement agent 0.01 to 30% by weight and water 0.1 to 30% by weight,
The fast-intensity strength developing agent is 3 to 75% by weight of crude steel Portland cement, 3 to 65% by weight of calcium sulfoaluminate, 1 to 45% by weight of calcium ferroaluminate, 1 to 30% by weight of plaster, 0.1 to 20% by weight of cristobalite, Hexafluor phosphate 0.01 to 10 wt%, magnesium fluoride 0.01 to 10 wt%, aluminosilicate 0.01 to 10 wt%, strontium aluminate 0.01 to 10 wt%, boron carbide 0.01 to 10 wt%, calcium nitrite 0.01 to 10 wt% % And 0.01 to 10% by weight of fine ceramic,
The fast-intensity strength developing agent further comprises 0.01 to 10% by weight of amorphous calcium aluminate, 0.01 to 10% by weight of magnesia, 0.01 to 5% by weight of a water reducing agent, and 0.01 to 5% by weight of a retarder,
The calcium ferro aluminate is composed of CaO-Al ₂ O ₃ -Fe ₂ O ₃ system, the content of Fe ₂ O ₃ is 20 to 30 mass%, the molar ratio of CaO / Al ₂ O ₃ is 0.3 to 0.7 , The powder degree is a specific surface area of 3,000 to 8,000 cm ² / g,
The magnesia is a dead burnt magnesia that lowers activity by firing magnesium carbonate (MgCO ₃ ) or dolomite (CaMg (CO ₃ ) ₂ ) at 1450 ° C. or higher; The magnesia is a mixture of magnesium magnesia (MgCO ₃ ) or dolomite (CaMg (CO ₃ ) ₂ ) with light or small magnesia calcined at a range of 1000 to 1300 ° C. in a 1: 4 weight ratio;
The functional improving agent is 30 to 45% by weight of styrene-vinyl acetate copolymer, 21 to 55% by weight of polyether-ether ketone copolymer, 1 to 25% by weight of ethylene-vinyl acetate-vinyl alcohol copolymer, aminoalkyl polymethacrylate 1 to 25% by weight of ester, 0.1 to 15% by weight of polymethylpentene, 0.1 to 15% by weight of glutaconic acid, 0.1 to 15% by weight of sodium hydride, 0.01 to 10% by weight of polycarboxylic acid-based water reducing agent, and 0.01 to 10% of silicone type antifoaming agent %,
The functional improvement agent further comprises 0.01 to 10% by weight of N- [3- (trimethoxysilyl) propyl] aniline, 0.01 to 10% by weight of ammonium noniphenol ether sulfate, and 0.01 to 10% by weight of dibutyltin diacetate. ;
The slump (cm) according to the method specified in KS F 2402 is 20.5 after 21, 20 minutes immediately after stirring, 12 to 17 after 40 minutes, 16 to 19, and 12 to 17 after 40 minutes; according to the method specified in KS F 2405 Compressive strength (MPa) is 32.7 to 34.8 after 4 hours, 38.8 to 42.8 after 1 day, 43.5 to 47.2 after 7 days, 47.2 to 50.1 after 28 days; The bending strength (MPa) according to the method specified in KS F 2408 is 5.8 to 6.1 after 4 hours, 6.5 to 7.2 after 1 day, 7.4 to 8.6 after 7 days, and 7.9 to 8.8 after 28 days; The adhesive strength (MPa) according to the method specified in KS F 2762 is 1.70 to 1.81 after 4 hours, 1.80 to 1.85 after 1 day, 1.95 to 2.25 after 7 days, and 2.15 to 2.45 after 28 days; The rate of change in length (%) by KS F 2424 (Test method for changing the length of concrete) is 0.001 to 0.015; Salt penetration resistance (coulombs) by KS F 2711 is 362 to 585; As a result of the freeze-thaw resistance test specified in KS F 2456, the freeze-thaw resistance (%) was 86 to 93; According to the method specified in SS 13 72 44 A, the scaling resistance test result is suitable; Abrasion resistance according to the method specified in ASTM C 779 (mm) is 0.026 ~ 0.050; According to the Japanese industrial standard draft [method for chemical resistance test by solution deposition of concrete], a test solution was immersed in an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide as a test solution for 28 days. (%) Is -0.8 to -0.2 for hydrochloric acid, -0.02 to 0 for sulfuric acid, +0.05 to +0.1 for sodium hydroxide; The anti-corrosion rate (%) by KS F 2561 (rust inhibitor for reinforced concrete) is 96.6 ~ 98.8.
delete delete As a road pavement repair and reinforcement method using a super-hard cement concrete composition for emergency repair according to claim 1,
Removing the deteriorated part of the concrete due to the deterioration of the performance of the concrete structure, the part from which the concrete is dropped, or the asphalt concrete using a road crusher;
Removing the removed part to the lower part of the deteriorated part with a water jet, a high pressure washer, a hand water jet, a planing machine, and a shot blast and cleaning with a vacuum suction vehicle;
The urgent maintenance cemented concrete composition improves adhesion to the existing concrete slab, strengthens the surface layer, inhibits penetration of harmful substances, water, and chlorine ions, and applies the functional improvement agent to the cleaned area to improve water resistance. step;
Pouring or repairing or reinforcing the cross section of the deteriorated area by pouring the super-hard cement concrete composition for emergency repair on the top of which the function improving agent is applied;
Performing vertical and transverse tining to prevent the surface of the cemented concrete composition for emergency repair from being poured;
Applying a coating curing agent to prevent plastic cracks by preventing evaporation of moisture on the thinned cemented concrete composition for emergency repair; And
Road pavement repair and reinforcement method using an ultra-fast cemented concrete composition for emergency repair, comprising the step of curing.