KR101816756B1 - High Performance Fast Cement Concrete Composition and Road Pavement Maintenance Method Using the Same - Google Patents

Abstract

The present invention relates to an ultra-rapid hardening cement concrete composition and a method for maintaining and repairing concrete road pavement and bridge-deck pavement using the same, wherein repair on road pavement and bridge-deck pavement and road repair construction can be done in a short time and passage of vehicles can be possible. The present invention provides an ultra-rapid hardening cement concrete composition comprising: 5 to 40 wt% of an ultra-rapid hardening cement-based binder; 25 to 65 wt% of fine aggregates; 15 to 65 wt% of coarse aggregates; 2 to 25 wt% of water; 0.5 to 11 wt% of an admixture; and 0.01 to 17 wt% of a polymer performance enhancer. The ultra-rapid hardening cement-based binder includes: 10 to 30 wt% of ordinarily Portland cement clinker ground powder; 35 to 60 wt% of hauyne rapid-hardening cement; 15 to 42 wt% of calcium aluminate; 0.5 to 10 wt% of silica fume; 0.1 to 10 wt% of gypsum; 2 to 10 wt% of slag powder; and 0.1 to 5 wt% of calcium hydroxide. The admixture is composed of: 0.05 to 5 wt% of a compound including at least one selected from a group consisting of phosphate, zinc carbonate, citric acid, alkali metal citrate, lignin sulfonate, and polyvinyl alcohol as a set retarder; and 0.1 to 8 wt% of a compound including at least one selected from a group consisting of triethanolamine, calcium silicate, calcium chloride, and lithium carbonate as a set accelerator.

Description

TECHNICAL FIELD [0001] The present invention relates to a high speed quick cement concrete composition, and a road pavement maintenance method using the same.

The present invention relates to a quick-setting concrete composition for use in repairing concrete pavement and bridge, and more particularly, to a quick-setting concrete composition for use in repairing concrete pavement, bridge, And to concrete pavement roads and pavement pavement maintenance methods using the same.

In general, concrete structures may cause fatal defects due to strength degradation, cracks, etc. due to the influence of time and environment, plastic shrinkage, drying shrinkage, fatigue phenomena and the like.

In the case of concrete structures, corrosion and erosion due to vehicle load, environmental factors are frequently occurred on road roads and bridge decks, and maintenance of these parts and prevention of deterioration of concrete structures due to these factors Prevention is needed. In the past, repair and reinforcement work was usually done by using Portland cement. However, maintenance and reinforcement work by Portland cement concrete usually takes a lot of time for curing and causes traffic congestion on the road. However, considering the logistic transportation function of the road, the economic loss caused by the traffic congestion caused by the road repair work is enormous. Therefore, in order to mitigate the traffic congestion due to the road repair, the quick cement should be used in a short time. However, in order to minimize the traffic control due to the road repair work, it is effective for repairing the road using high speed cement concrete and it is effective for expressing rapid strength. However, due to high hydration heat and drying shrinkage compared to portland cement and crude steel cement, The internal stress is likely to remain and microcracks tend to occur. Such micro-internal defects may directly or indirectly affect the mechanical properties of the concrete structure, which may adversely affect the stability of the concrete structure.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an economical and improved characteristic quick-setting cement concrete composition, and a maintenance method of concrete pavement using the cement concrete composition.

In order to achieve the above object, the present invention provides a cement mortar composition comprising 5 to 40% by weight of a very fast cement based binder, 25 to 65% by weight of fine aggregate, 15 to 65% by weight of coarse aggregate, 2 to 25% And the polymer performance improving agent is 0.01 to 17% by weight. The cementitious binder is usually 10 to 30% by weight of Portland cement clinker powder, 35 to 60% by weight of Auwinite quick-setting cement, 15 to 42% by weight of calcium aluminate, By weight of silica fume, 0.5 to 10% by weight of silica fume, 0.1 to 10% by weight of gypsum, 2 to 10% by weight of fine powder of slag and 0.1 to 5% by weight of slaked lime. The admixture is selected from the group consisting of phosphate, zinc carbonate, citric acid, 0.05 to 5% by weight of a compound containing at least one member selected from the group consisting of ligninsulfonic acid salts and polyvinyl alcohols and at least one member selected from the group consisting of triethanolamine, calcium silicate, calcium chloride and lithium carbonate as a condensation accelerator 0.1 to 8% by weight of the compound It provides an initial velocity environment cement concrete composition characterized in that.

Also, the quick-setting cement concrete binder may be a polymer admixture comprising a compound consisting of at least one of styrene, butadiene, butyl methacrylate, methyl methacrylate-butadiene, potassium persulfate or hydroperoxide and sorbitan trioleate, At least one compound selected from at least one lipophilic surfactant selected from glyceryl monostearate, glyceryl monostearate, sorbitan monooleate, and the like.

The quick-setting cement concrete binder may further comprise 1 to 3% by weight of at least one compound selected from zinc oxide and titanium dioxide.

The quick-setting cement concrete binder may further contain 0.2 to 1% by weight of at least one compound selected from the group consisting of stearic acid, strontium hydroxide, cyanamide, cetane and isocetane as latent heat materials.

The present invention also provides a road maintenance method using the ultra low speed cement concrete composition, which comprises the following steps in order to solve the above technical problems.

Removing impurities and deteriorated portions by using a crusher and a water jet to a concrete road surface or a concrete portion of a bridge surface that is deteriorated;

Washing the deteriorated portion of the deteriorated concrete and cleaning it;

Restoring a section of the deteriorated portion by placing the ultra high speed concrete composition;

And applying a curing agent to the upper surface of the newly installed quick-setting cement concrete composition.

According to the present invention, the ultra low speed cement concrete composition comprises a common portland cement binder and an aged hardened cementitious binder including ordinary Portland cement binder, Arwin clinker fine powder, calcium aluminate, silica fume, gypsum, fine slag powder, slaked lime and admixture Cement concrete material for maintenance method of road pavement, pavement pavement repairing method which can shorten curing period compared to concrete, reduce heat generated by initial hydration to prevent cracking, improve durability, and solve high cost of cement- Can be provided.

The ultra rapid cement concrete composition of the present invention comprises 5 to 40% by weight of a cementitious binder of the present invention, 25 to 65% by weight of fine aggregate, 15 to 65% by weight of coarse aggregate, 2 to 25% by weight of water and 0.1 to 11% And 0.01 to 17% by weight of an improvement agent.

The aggregate used in the present invention is classified into a coarse aggregate and a fine aggregate. The fine aggregate has a grain size of 5 mm or less. The coarse aggregate has a grain size of 5 mm or more. The fine aggregate is 25 to 65% by weight based on the initial speed cement concrete composition, the coarse aggregate is 15 to 65% by weight based on the initial speed cement concrete composition, and the admixture is 0.1 to 13% by weight based on the initial speed cement concrete composition .

The cementitious binder according to claim 1, wherein the cementitious binder comprises 10-30 wt% of Portland cement clinker powder having a powder degree of 5,500-8,500 cm 2 / g, 35-60 wt% of Erwin fast cement powder having a powder degree of 6,000 cm 2 / g or more, A slag fine powder of 8,5000 cm2 / g, 2 to 10 weight% of a slag fine powder, 15 to 42 weight% of calcium aluminate, 0.5 to 10 weight% of silica fume, 0.1 to 10 weight% of gypsum, 0.1 to 5 weight% of slaked lime, At least one compound selected from zinc chloride, phosphate, zinc carbonate, citric acid, citric acid alkali metal phosphate, green sulfonic acid salt and polyvinyl alcohol as a coagulation retarding agent for improving workability at initial initial speed cement concrete pouring is 0.05 to 5 % By weight of cement, 0.1 to 8% by weight of at least one compound selected from triethanolamine, calcium silicate, calcium chloride, and lithium carbonate as a condensation accelerator for increasing the curing rate after cement concrete pouring.

Among the quick-setting cement concrete binder, the gypsum may include at least one selected from natural anhydrous gypsum, chemical gypsum gypsum and chemical gypsum gypsum.

The Portland cement may be a KS product, but it is preferred to use ordinary portland cement having a powder density of 5,500 to 8,500 cm 2 / g in order to increase the hydration reaction rate and increase the curing reaction rate.

The curing reaction of hydraulic binders including cement with very fast speed is due to the chemical reaction (hydration reaction) of water with hydraulic materials such as C2S, C3S, C3A, C12A7, and CSA, so the higher the degree of powder, the faster the reaction rate. However, in order to increase the powdering degree, it is necessary to obtain an appropriate level of powdering degree because the cost of pulverization increases.

When the powdery cement has a powdery degree of less than 5,500 cm2 / g, the hydration reaction rate is slow and the hardening is delayed. When the powdery cement is more than 8,500 cm2 / g, the hydration reaction rate is increased but the crushing cost is high and the productivity is deteriorated. In addition, the hydration rate of C2S and C3S, which are major hydration minerals of Portland cement, is lower than that of other hard - hard minerals.

When the weight ratio of Erwin cemented hardened cement increases, it exhibits fast curing rate and exhibits initial expansibility. The Irwin quick-setting cement may have a powder content of 6,000 cm 2 / g or more and 35 to 60% by weight of the cementitious fastening material at the initial speed. Irwin cemented cement is a cement mineral which is rapidly cured by hydration reaction, and it can exhibit a very rapid hardness with a powder degree of 6,000 cm2 / g or more. When the content of the hard cement in the diluent is less than 35% by weight, the initial strength is low and the hardening speed is slow. When the content of the hard cement in the diluent is more than 60% by weight, the curing rate is accelerated, And the initial strength is lowered.

The calcium aluminate is a quick-setting cement mineral, C12A7 (12CaO.7Al2O3), which is a main component and forms a hydrated hydrate by hydration reaction. The calcium aluminate is used for initial strength development. The calcium aluminate is preferably contained in an amount of 15 to 42% by weight based on the cement-based fastening material. If the calcium aluminate content is less than 15% by weight, the initial strength development is delayed and the cement function at the fast speed can not be exhibited. If the calcium aluminate content exceeds 42% by weight, the initial curing speed is increased and the workability is deteriorated. At this time, if an excessive curing retardant is used for ensuring workability, the initial strength is lowered due to the action of the retarder covering the hydrated mineral.

It is preferable that the ultra low speed cement based binder contains 0.5 to 10 wt% of silica fume and 0.1 to 5 wt% of slaked lime. The silica fume reacts with the slaked lime to produce calcium silicate hydrate, thereby enhancing the concrete strength by filling the pores of the quick-setting cement concrete. When the silica fume is 10 wt% and the slaked lime is more than 5 wt% I can not see. Since the silica fume has a very high degree of powder, it is preferable that the slaked lime has an average particle diameter of 75 mu m in order to improve the slaked lime and the reactivity.

The slag fine powder has latent hydraulic properties and is a material exhibiting pozzolanic reactivity, and can be used for improving long-term strength and improving durability and hydration heat. The slag fine powder may be contained in an amount of 2 to 10% by weight with respect to the ultra low speed cement based binder. The powder of the slag powder is preferably 6,000 ~ 8,500cm2 / g. When the powder is less than 6,000cm2 / g, the pozzolanic reactivity may be low. When the powder is more than 8,500cm2 / g, And the economy can be lowered. In addition, when the slag fine powder is less than 2% by weight, the long-term strength development may be weak, and when it is more than 10% by weight, the initial strength development may be delayed. More preferably, the fine slag powder is a blast furnace slag fine powder.

The gypsum may be selected from natural anhydrous gypsum or chemically anhydrous gypsum and may be used in an amount of 0.1 to 10% by weight based on the quick-setting hardened cement based binder. Gypsum functions to tighten the structure of hydration minerals, increase the initial hydration reaction rate, prevent shrinkage of concrete, and control the hydration rate of cement minerals. If the gypsum content is less than 0.1% by weight, the ability to control the hydration rate by the gypsum can not be expected and the effect of preventing the concrete from shrinking can not be expected. When the gypsum content exceeds 10% by weight, Expression may be delayed.

It is preferable that the concrete composition containing the ultra low speed cement based binder contains 0.05 to 5 wt% of a coagulation retarder as an admixture, and the coagulation retarder is an initial working time of the cement based binder, fine aggregate, coarse aggregate, It is used for maintenance and improvement of workability. It is preferable that at least one compound selected from the group consisting of zinc chloride, phosphate, zinc carbonate, citric acid, alkali metal citrate, ligninsulfonic acid and polyvinyl alcohol is used as the coagulation retarder. When the content of the coagulation retarder is less than 0.05% by weight, the initial coagulation retarding effect can not be expected and the workability may be poor. When the content of the coagulation retardant is more than 3% by weight, the initial strength development may be delayed have.

The above-mentioned condensation accelerator is a method of accelerating the initial strength development by activating the hydration reaction of the ultra rapid cement concrete after placing a cement concrete mixture with a very fast cementitious binder, fine aggregate, coarse aggregate, and water on a road or bridge maintenance surface To indicate the cement compressive strength that can be transported within 3 hours. It is preferable that 0.05 to 8% by weight of a compound containing at least one member selected from the group consisting of triethanolamine, calcium silicate, calcium chloride and lithium carbonate is used as the condensation accelerator. If the content of the condensation accelerator is less than 0.05 wt%, the initial curing rate is delayed. If the content of the condensation accelerator is more than 8 wt%, the curing rate increases but the initial hydration heat increases, So that the durability can be lowered.

The polymer performance improver may be selected from the group consisting of 20-63 wt.% Of styrene, 2-25 wt.% Of butadiene, 5-15 wt.% Butyl methacrylate, 1-10 wt.% Methyl methacrylate-butadiene, 1 wt.% Of potassium persulfate or hydroperoxide From 0.05 to 2% by weight of at least one lipophilic surfactant selected from sorbitan trioleate, sorbitan tristearate, glyceryl monostearate, sorbitan monooleate, and from 0.2 to 4% The polymer performance improving agent is a latex coating film formed by polymerization of styrene with butadiene, butyrate, and methyl methacrylate-butadiene, and the late reaction of cement hydration and the initial reaction-producing hydrate, To prevent the initial intensity expression from being delayed. The potassium sulfate and the hydroperoxide function as a reaction catalyst between styrene and butadiene and accelerate the polymerization reaction of styrene, butadiene, butylmethacrylate and methyl methacrylate-butadiene by the heat of cement hydration and absorb hydration heat, To prevent the microcracks of concrete structures from being generated. The lipophilic surfactant serves to uniformly disperse the styrene, butadiene, butylmethacrylate, and methyl methacrylate-butadiene in the quick-setting cement concrete composition in a short period of time.

The ultra low speed cementitious concrete binder may further contain 1 to 3 wt% of at least one compound selected from zinc oxide and titanium dioxide in the ultra fast cement based binder. The zinc oxide or titanium dioxide emits electrons by receiving solar energy and the emitted electrons react with external organic contaminants to decompose. The quick-setting cement concrete containing at least one of zinc oxide or titanium dioxide serves to reduce organic contaminants on road pavement surfaces or bridge surfaces.

The ultra low speed cementitious concrete binder may further contain 0.2 to 1% by weight of at least one compound selected from the group consisting of stearic acid, strontium hydroxide, cyanamide, cetane and isocetane. The above-mentioned stearic acid, strontium hydroxide, cyanamide, cetane and isocetane groups are used as the latent heat material, and the hydration heat generated at the step of curing the concrete in the hardened concrete mixture after mixing with the aggregate, fine aggregate, So that the heat of hydration of concrete can be reduced. The latent heat material may include 0.2 to 1% by weight of the ultrahigh speed cementitious binder. When the amount of the latent heat material is less than 0.2% by weight, the function of absorbing the initial hydration heat of the concrete is weak and the effect of reducing hydration heat may be low. When the amount of the latent heat material is more than 1% by weight, And the hydration rate may be lowered.

The amount of latent heat of the latent heat material is as small as about 203 J / g of stearic acid, 343 J / g of strontium hydroxide, 208 J / g of cyanamide, and 229 J / g of cetane and isocetane, Cracks can be reduced.

Hereinafter, the packaging repairing method according to the present invention will be described.

The road or bridge pavement maintenance method using the quick-release cement concrete composition of the present invention includes the steps of removing impurities and deteriorated parts by using a crusher and a water jet in a concrete road surface or a concrete part of a bridge surface or a bridge surface, Removing the damaged concrete from the deteriorated portion and installing the cement concrete at the first speed to the washed portion to restore the damaged section; And applying a curing agent to the top of the cementitious concrete composition.

It is preferable that the deteriorated part is removed by using a water jet to remove the deteriorated concrete and the deteriorated concrete surface of the deteriorated concrete is completely removed.

Hereinafter, embodiments of the high-functional quick-release cement concrete composition according to the present invention will be more specifically described. The present invention is not limited to the following embodiments.

≪ Example 1 >

18 wt% of cement based binder, 42 wt% of fine aggregate, and 32 wt% of coarse aggregate were added to a mixer and stirred. Then, 3.5 wt% of water, 1 wt% of coagulation retarder, 2 wt% of coagulation accelerator, 1.5 wt% were added and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based binder of the present invention has a composition of 18 wt% of ordinary Portland cement having a powder content of 6,500 cm < 2 > / g, 45 weight% of Arwin's hard cement having a powder density of 7,000 cm2 / g, 23 weight% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

≪ Example 2 >

18 wt% of cement based binder, 42 wt% of fine aggregate, and 32 wt% of coarse aggregate were added to a mixer and stirred. Then, 3.5 wt% of water, 1 wt% of coagulation retarder, 2 wt% of coagulation accelerator, 1.5 wt% were added and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based fast coupler of the present invention is a blast furnace having 12 weight% of ordinary Portland cement having a powder weight of 6,500 cm2 / g, 45 weight% of Arwin fast cement having 7,000 cm2 / g of powder, 29 weight% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

≪ Example 3 >

18 wt% of cement based binder, 42 wt% of fine aggregate, and 32 wt% of coarse aggregate were added to a mixer and stirred. Then, 3.5 wt% of water, 1 wt% of coagulation retarder, 2 wt% of coagulation accelerator, 1.5 wt% were added and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based binder of the present invention has a composition of 12 wt% of ordinary Portland cement having a powder content of 6,500 cm < 2 > / g, 51 wt% of Arwin's hard cement having a powder density of 7,000 ci / g, 23 wt% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

<Example 4>

18 wt% of cement based binder, 42 wt% of fine aggregate, and 32 wt% of coarse aggregate were added to a mixer and stirred. Then, 3.5 wt% of water, 1 wt% of coagulation retarder, 2 wt% of coagulation accelerator, 1.5 wt% were added and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based fast coupler of the present invention is a blast furnace having 12 weight% of ordinary Portland cement having a powder weight of 6,500 cm2 / g, 48 weight% of an Arwin fast cement having a powder weight of 7,000 cm2 / g, 26 weight% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

&Lt; Example 5 >

18 wt% of cement based binder, 41 wt% of fine aggregate, 31 wt% of coarse aggregate, and 3 wt% of water, 0.5 wt% of latent heat material and 1.5 wt% of retardant, and 1 wt% %, 2% by weight of a condensation accelerator and 1.5% by weight of a polymer performance improving agent were mixed and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The latent heat material was mixed with cetane and strontium hydroxide in a weight ratio of 1: 1, and zinc oxide was used as an antifouling material.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based binder of the present invention has a composition of 18 wt% of ordinary Portland cement having a powder content of 6,500 cm &lt; 2 &gt; / g, 45 weight% of Arwin's hard cement having a powder density of 7,000 cm2 / g, 23 weight% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

&Lt; Example 6 >

A mixture of 18 wt% of cement based binder, 41 wt% of fine aggregate, 31 wt% of coarse aggregate, and 3.5 wt% of water, 0.5 wt% of latent heat material and 1.5 wt% of retardant, %, 2% by weight of a condensation accelerator and 1.5% by weight of a polymer performance improving agent were mixed and mixed in a concrete mixer to prepare a quick-setting cement concrete composition.

The latent heat material was mixed with cetane and strontium hydroxide in a weight ratio of 1: 1, and zinc oxide was used as an antifouling material.

The coagulation retarder used was a mixture of citric acid and polyvinyl alcohol in a weight ratio of 1: 1, and the coagulation accelerator used was lithium carbonate.

The cement-based binder of the present invention has a composition of 12 wt% of ordinary Portland cement having a powder content of 6,500 cm &lt; 2 &gt; / g, 51 wt% of Arwin's hard cement having a powder density of 7,000 ci / g, 23 wt% of calcium aluminate, 5 weight% of slag powder, 4 weight% of gypsum powder mixed with 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, 3.5 weight% of silica fume and 1.5 weight% of slaked powder having an average particle size of 74 占 퐉.

The polymer performance improver was prepared by mixing 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butylmercacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate, and 0.5 wt% of sorbitan trioleate Respectively.

Comparative examples that can be compared with the embodiments of the present invention are shown to more easily grasp the characteristics of the first to sixth embodiments, and comparative examples will be described below.

&Lt; Comparative Example 1 &

19% by weight of cement based binder, 41% by weight of fine aggregate, and 32.5% by weight of coarse aggregate were mixed in a mixer and then mixed with 7% by weight of water and 0.5% by weight of admixture in a mixer for concrete to prepare a cement concrete composition.

A naphthalene-based water reducing agent was used as the admixture.

The cementitious binder contained 28 wt% of blast furnace slag powder having 60 wt% of Portland cement and 7000 cm 2 / g of powder, 8 wt% of gypsum powder mixed 1: 1 (weight ratio) of anhydrous gypsum and desulfurized gypsum, And 4 wt% of the slaked powder of 74 mu m were mixed and used.

&Lt; Comparative Example 2 &

19% by weight of cement based binder, 41% by weight of fine aggregate, and 32.5% by weight of coarse aggregate were mixed in a mixer and then mixed with 7% by weight of water and 0.5% by weight of admixture in a mixer for concrete to prepare a cement concrete composition.

A naphthalene-based water reducing agent was used as the admixture.

The cement-based fast coupler of the present invention is a blast furnace having 15 weight% of ordinary Portland cement having a powder of 6,500 cm2 / g, 51 weight% of Arwin fast cement having a powder density of 7,000 cm2 / g, 29 weight% of calcium aluminate, And 5% by weight of a slag fine powder were mixed and used.

&Lt; Comparative Example 3 &

19% by weight of cement based binder, 41% by weight of fine aggregate, and 32.5% by weight of coarse aggregate were mixed in a mixer and then mixed with 7% by weight of water and 0.5% by weight of admixture in a mixer for concrete to prepare a cement concrete composition.

The cement-based fast coupler of the present invention is composed of 52 wt% of ordinary Portland cement having a powder of 6,500 cm 2 / g, 20 wt% of Arwin fast cement with 7000 cm 2 / g of powder, 10 wt% of calcium aluminate, 4 wt% of gypsum powder mixed with 9 wt% of slag fine powder, 1 wt% of gypsum anhydrous gypsum and 1 wt.% Of desulfurized gypsum, 3.5 wt% of silica fume and 1.5 wt% of slaked powder having an average particle size of 74 mu m.

The physical properties of the ultra fast cement concrete composition using the ultra fast cement based binder according to Examples 1 to 6 and the ultra rapid cement concrete composition prepared according to Comparative Examples 1 to 3 were compared, . The physical properties for comparison were compressive strength, flexural strength, and maximum rise temperature due to hydration which occurred during hydration.

Table 1 below shows the compressive strength changes according to Examples 1 to 6 and Comparative Examples 1 to 3.

Compressive strength (MPa) 3 hours 12 hours 1 day 7 days 28th Example 1 29.5 32.9 34.5 38.1 41.8 Example 2 30.2 33.6 37.4 39.7 42.3 Example 3 30.8 34.1 37.7 40.3 43.7 Example 4 32.4 35.7 38.3 42.5 45.6 Example 5 28.5 30.2 34.5 38.9 41.8 Example 6 29.7 31.7 34.2 38.3 41.2 Comparative Example 1 - - - 29.2 36.7 Comparative Example 2 23.4 25.4 27.3 34.8 38.6 Comparative Example 3 20.6 21.5 25.8 33.7 37.4

As shown in Table 1, the fast cement-based concrete compositions prepared according to Examples 1 to 6 exhibit excellent compressive strengths as compared with the cement concrete compositions prepared according to Comparative Examples 1 to 3.

Table 2 below shows changes in flexural strength according to Examples 1 to 6 and Comparative Examples 1 to 3.

Flexural strength (MPa) 3 hours 12 hours 1 day 7 days 28th Example 1 5.1 5.6 6.0 6.4 6.9 Example 2 5.4 5.9 6.5 6.9 7.3 Example 3 5.4 6.0 6.4 6.8 7.3 Example 4 5.7 6.4 6.7 7.1 7.4 Example 5 4.9 5.5 5.9 6.3 7.0 Example 6 4.9 5.8 6.0 6.4 7.0 Comparative Example 1 - - - 5.0 6.2 Comparative Example 2 4.2 4.6 5.0 6.2 6.5 Comparative Example 3 3.7 4.3 4.9 5.8 6.3

As shown in Table 2, the quick-setting cement concrete compositions prepared according to Examples 1 to 6 exhibit excellent bending strength characteristics as compared with the cement concrete compositions prepared according to Comparative Examples 1 to 3. [ This shows that the cement concrete composition according to Comparative Example 1 to Comparative Example 3 is superior to the cement concrete composition according to Comparative Examples 1 to 3 for the load generated by the driving of the vehicle when the quick-setting cement concrete according to the present invention is placed on the road surface, Lt; / RTI &gt;

Table 3 below shows the rise temperature due to hydration heat generated when the cement concrete composition according to Examples 1 to 6 and Comparative Examples 1 to 3 was hydrated.

Maximum rising temperature (℃) Remarks Example 1 61.2 Example 2 63.7 Example 3 63.4 Example 4 65.5 Example 5 57.3 Example 6 58.4 Comparative Example 1 60.4 Comparative Example 2 68.8 Comparative Example 3 63.7

As shown in Table 3, the temperature at which the ultra fast cement concrete composition produced according to Examples 1 to 6 is generated by hydration causes microcracks in the concrete structure during hydration, and the microcracks Is a major factor in shortening the life of concrete structures such as roads. In Examples 5 and 6 of Table 3, the hydration heat can be lowered when the cement concrete composition is hydrated at a very rapid rate by using the latent heat material. By reducing the heat generated in the hydration process by the latent heat material, microcracks in the concrete structure are prevented So that the life of the concrete structure can be prevented from shortening.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications are possible within the scope and spirit of the invention .

Claims (6)

5 to 40% by weight of a cementitious inorganic binder, 25 to 65% by weight of a fine aggregate, 15 to 65% by weight of a coarse aggregate, 2 to 25% by weight of water and 0.1 to 11% by weight of an admixture and 0.01 to 17% ,
Wherein the cementitious binder is a cementitious material comprising 10 to 30% by weight of pulverized Portland cement clinker powder, 35 to 60% by weight of Auwinite quick-setting cement, 15 to 42% by weight of calcium aluminate, 0.5 to 10% by weight of silica fume, By weight, 2 to 10% by weight of slag fine powder and 0.1 to 5% by weight of slaked lime,
The admixture comprises 0.05 to 5% by weight of a 1: 1 (weight ratio) mixture of citric acid and polyvinyl alcohol as a coagulation retarder and 0.05 to 6% by weight of lithium carbonate as a condensation accelerator,
The polymer performance improving material is composed of 58 wt% of styrene, 25 wt% of butadiene, 11 wt% of butyl methacrylate, 5 wt% of methyl methacrylate-butadiene, 0.5 wt% of potassium persulfate and 0.5 wt% of sorbitan trioleate ,
And 0.5 wt% of a 1: 1 (weight ratio) mixture of cetane and strontium hydroxide as a latent heat material.
The method according to claim 1,
The powdery degree of the Portland cement clinker powder is 5,500 to 8,500 cm 2 / g, the powdery degree of the Awen-type fast-curing cement is 6,000 cm 2 / g or more, and the powder degree of the blast furnace slag powder is 6,000 to 8,500 cm 2 / g Cement concrete composition
delete The method according to claim 1,
Wherein the quick-setting cement composition further comprises 1 to 3% by weight of at least one compound selected from zinc oxide and titanium dioxide.
delete As a road maintenance method using a quick-setting cement concrete composition,
Removing impurities and deteriorated portions by using a crusher and a water jet to a concrete road surface or a concrete portion of a bridge surface that is deteriorated;
Washing and cleaning the deteriorated portion of the deteriorated concrete;
5. A method for repairing a cement mortar composition, comprising: cementing a cementitious cement concrete composition according to any one of claims 1, 2, and 4 to restore a section of a deteriorated site;
And applying a curing agent on top of the pavement cement concrete composition. The method for repairing concrete pavement using the quick-release cement concrete composition.