KR101796418B1 - Fast Cementitious Cement Concrete Composition and Repair Method of Concrete Pavement Using the Same - Google Patents

Abstract

The present invention relates to a cementitious mortar composition comprising 5 to 40% by weight of a quick hardening cementitious cementitious binder, 25 to 65% by weight of a fine aggregate, 10 to 65% by weight of a coarse aggregate, 2 to 25% by weight of water and 0.1 to 5% The hard hardwood cementitious binder is usually 30 to 45% by weight of Portland cement clinker pulverized powder, 30 to 45% by weight of Auwinite quick hard mineral, 10 to 20% by weight of ultra fast cement, 0.1 to 2% by weight of gypsum, 2 to 10% By weight of a latent heat material, and 0.1 to 5% by weight of a latent heat material, and a method of repairing a pavement using the same. According to the present invention, maintenance cost and workability can be improved by solving the high cost of ultra fast cement concrete and by shortening the curing period and improving the durability, compared with ordinary portland cement concrete, crude steel cement concrete and rough steel cement concrete.

Description

TECHNICAL FIELD [0001] The present invention relates to a cementitious cementitious concrete composition and a concrete pavement repairing method using the same,

The present invention relates to a rapid hardened cementitious cement concrete composition and a method for repairing concrete pavement using the same. More particularly, the present invention relates to a cementitious cementitious cementitious concrete composition for cementitious concrete, The present invention relates to a cementitious hardened cementitious concrete composition used for repairing concrete roads, bridges, bridge pavements, etc., and concrete pavement and pavement repairing 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. In order to shorten the curing time, quick-curing cement can be used. However, since the cement is fast in cost and effective for rapid strength development, internal stress is left in the structure due to high hydration heat and drying shrinkage compared to ordinary portland cement Micro-cracks are likely to occur, and these 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.

Therefore, the technical problem to be solved by the present invention is to shorten the concrete curing period, minimize the internal defects of the concrete structure to improve the durability and strength, and shorten the curing period than the hardened cement concrete and crude steel cement concrete, The present invention relates to a method for repairing road pavement and bridge pavement using the above-mentioned quick hardened cementitious concrete cement composition, which is more economical than cement concrete.

In order to achieve the above object, the present invention according to a first aspect is characterized by comprising 5 to 40% by weight of a quick hardening cementitious cement based binder, 25 to 65% by weight of a fine aggregate, 15 to 65% by weight of a coarse aggregate, 2 to 25% And 0.1 to 5 wt% of an admixture, wherein the quick-setting hardened cementitious binder comprises 30 to 45 wt% of Portland cement clinker pulverized powder, 30 to 50 wt% of Auwinite quick-hard mineral, 10 to 20 wt% of ultra- 0.1 to 2 wt% of gypsum, 2 to 10 wt% of slag fine powder and 0.1 to 5 wt% of latent heat material.

The powder of the ordinary Portland cement clinker powder is 4500-5800 cm 2 / g, the powder of the slag powder is 6000-8000 cm 2 / g, and the gypsum is a gypsum containing at least one of natural anhydrous gypsum and chemical anhydrous gypsum. The powder as the mixture may also be 5500 to 8500 cm2 / g.

The latent heat material may include at least one member selected from the group consisting of ethylenediamine, sodium sulfate, strontium hydroxide, acetamide, cetane and isocetane.

The admixture may contain 0.1 to 3% by weight of citric acid as a coagulation retardant; And 0.2 to 3% by weight of a compound containing at least one member selected from the group consisting of lithium carbonate, calcium chloride and sodium hydroxide as a curing accelerator.

The rough steel concrete composition may further contain 3 to 8% by weight of a fine silica powder having a particle size of 7500 to 8500 cm 2 / g in terms of the quick hardening steel cement composition.

According to a second aspect of the present invention, there is provided a method of repairing and repairing a pavement using a quick-hardening hardened steel cement composition, comprising the steps of: cutting and blasting a road surface using a crusher, a planer, a shot blaster or the like to remove runners and impurities; Cleaning the removed area; Sprinkling on the cleaned area to maintain the wet state; Bumming or primer treatment to obtain a high adhesive strength and a waterproofing effect after maintaining the wet state; 5. A method for manufacturing a cemented carbide cement composition, comprising the steps of: placing an ingot-treated steel cement composition according to any one of claims 1 to 5 on a brimmed or primed top; Spraying a curing agent to prevent evaporation of water at the upper portion after pouring to prevent initial plastic cracking; Tinning to increase the cracking inducing and sliding resistance after the curing agent is sprayed; Wherein the curing step comprises: 1) applying only the curing agent according to the atmospheric conditions including the temperature of the site, humidity, wind intensity, or 2) spraying the curing agent, Or 3) holding curing while maintaining the thermal insulation by using vinyl, curing cloth, or heat shield after spraying curing agent, and applying the curing agent The present invention provides a method for repairing a pavement using a cement composition.

According to the present invention, the cement composition of the crude steel-type steel cement concrete cement reduces the period of curing compared to the concrete including the Portland cement-based binder, the crude steel-cementitious binder and the hardened cementitious binder, It is possible to provide an economical cement concrete material for road pavement and pavement repairing method which can improve the durability and solve the high cost of the cement-based fastener of the fast speed.

The present invention provides a quick-hard-aged hardened cement concrete composition comprising 5 to 40% by weight of a quick-hardening hardened cementitious binder, 25 to 65% by weight of fine aggregate, 10 to 65% by weight of coarse aggregate, 2 to 25% %. ≪ / RTI >

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 preferably contained in an amount of 25 to 65% by weight based on the quick-setting ultramodern steel cement concrete composition, and the coarse aggregate is contained in an amount of 10 to 65% by weight with respect to the quick-setting ultramodern steel cement concrete composition.

The quick-hardening hardened cement based binder comprises 30 to 45 wt% of ordinary Portland cement having a powder degree of 4500 to 5800 cm 2 / g, 30 to 50 wt% of Irwin quick hard cement, 10 to 20 wt% of ultra fast cement, 2 to 10% by weight of a blast furnace slag having a specific gravity of 8000 cm 2 / g, a powder of 0.1 to 2% by weight of gypsum having a purity of 5500 to 8500 cm 2 / g and 0.1 to 5% by weight of a latent heat material.

The gypsum may include at least one selected from natural anhydrous gypsum and chemically anhydrous gypsum.

The latent heat material may include at least one compound selected from the group consisting of ethylenediamine, sodium sulfate, strontium hydroxide, acetamide, cetane and isocetane.

The ordinary Portland cement may be a KS product, but it is preferred that cement having a powder degree of 4500-5800 cm2 / g is used to promote the initial curing rate. At this time, when the degree of the powder exceeds 5800 cm 2 / g, the initial hydration heat may be increased as the hydration reactivity increases.

The weight ratio of Irwin cemented hardened cement shows fast curing rate and can exhibit expandability. The Irwin cured hard cement may include 30 to 50% by weight of the quick hardened cementitious cement based binder. If the content of the Irwin cured hard cement is less than 30% by weight, the initial strength of the cured cement may be insufficient, and the crack may be insufficient due to the shrinkage of the concrete during the initial curing process. , The initial strength is excellent but the workability is poor and the economical efficiency is low.

The initial velocity around cements _{4CaO · 3Al 2 O 3 · SiO} 2 in water, Ca (OH) _2, to react with gypsum Calcium Aluminum monosulfate to generate a hydrate and Ettringite that is seven days strength of ordinary Portland cement: 3 time expression It is preferable that 10 to 20% by weight of cement is included in the fast-curing hardened cement based binder. If the cement content of the ultra fast cement is less than 10% by weight, the initial strength development is delayed. If the cement content is more than 20% by weight, the initial strength increasing speed may increase but the economical efficiency may be lowered.

The gypsum may be selected from natural anhydrous gypsum or chemically anhydrous gypsum, and may be used in an amount of 0.1 to 2% by weight based on the quick-setting hardened cement based binder. Gypsum works to tighten the structure of hydration minerals, to prevent shrinkage of concrete, and to 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 2% by weight, Expression may be delayed.

The blast furnace 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 blast furnace slag fine powder may contain 2 to 10% by weight of the quick-hardening hardened cement based binder. The blast furnace slag preferably has a powder content of 6000 to 8000 cm < 2 > / g. When the powder is less than 6000 cm < 2 > / g, the pozzolanic reactivity may be low. And the economy can be lowered. If the blast furnace slag powder is less than 2% by weight, the long-term strength development may be weak, and if it is more than 10% by weight, the initial strength development may be delayed.

The latent heat material generally functions to reduce the heat of hydration generated when the portland cement, the ultra fast cement, and the ultra rapid cement are hydrated. Generally, portland cement, Aewin type hard cement, and quick speed cement have high hydration heat in the initial hydration stage. The heat of hydration is the biggest cause of concrete cracking, and the cracks due to hydration heat in the roads that occupy a large area such as road pavement, pavement pavement, and pavement pavement are the main causes of weakening durability.

The latent heat material may include at least one compound selected from the group consisting of ethylenediamine, sodium sulfate, strontium hydroxide, acetamide, cetane and isocetane. The latent heat material is included in the quick hardening steel cementitious binder to cure the cement concrete Phase transformation by the heat of hydration generated in the step of reducing the hydration heat of the concrete. The latent heat material may include 0.1 to 5% by weight of the quick hardening cement based hardening material. If the amount of the latent heat material is less than 0.1% by weight, the function of absorbing the initial hydration heat of the concrete is weak and the effect of reducing the hydration heat may be low. If the amount of the latent heat material exceeds 5% by weight, And the hydration rate may be lowered.

The quick-setting hardened steel cement based composition may further comprise 3 to 8% by weight of a fine silica powder having a powder viscosity of 7500 to 8500 cm 2 / g. The silica fine powder improves the surface durability of cement concrete and can improve the long - term strength development as a pozzolanic material with latent hydraulic properties. If the silica fine powder is less than 3% by weight based on the quick hardening cementitious binder, the long-term strength increase due to the pozzolanic reaction can not be expected. If it exceeds 8% by weight, the early strength development of the quick hardening cementitious cement concrete may be delayed have.

The concrete composition comprising the quick hardened steel cement based binder may contain 0.1 to 5% by weight of an admixture, and the admixture may include a coagulation retarder or a hardening accelerator. The coagulation retardant is used for maintaining the initial working time and improving the workability of the quick hardened hardened cementitious binder, fine aggregate, coarse aggregate, and water added concrete. It is preferable that citric acid is used as the coagulation retarder, and it is preferable that 0.05 to 3 wt% is included in the concrete composition of the quick-setting hardened cement based binder. 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.

Also, the curing accelerator is preferably a compound containing at least one member selected from the group consisting of lithium carbonate, calcium chloride and sodium hydroxide, and it is preferable that the curing accelerator contains 0.05 to 3% by weight based on the concrete composition of the quick hardening cement based binder. The curing accelerator functions to increase the hydration rate delayed by the coagulation retardant after application of the quick hardening cementitious cement concrete. If the content of the curing accelerator is less than 0.05 wt%, the initial curing rate may be delayed, If the content of the curing accelerator is more than 3% by weight, the curing rate is increased but the initial hydration heat generation amount is increased, resulting in fine cracks in the cured concrete, which may reduce the durability.

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

The method for repairing and repairing a pavement using an edible steel cement composition according to a preferred embodiment of the present invention includes the steps of: removing the laitance and impurities by cutting and blasting the pavement surface using a crusher, a planer, a shot blaster, or the like; Cleaning the removed part with hand water or the like; Sprinkling on the cleaned area to maintain the wet state; Bumming or primer treatment to obtain a high adhesive strength and a waterproofing effect after maintaining the wet state; Pouring the above-mentioned frost-hardened cement composition on top of briming or primer treated; Spraying a curing agent to prevent evaporation of water at the upper portion after pouring to prevent initial plastic cracking; Tinning to increase the cracking inducing and sliding resistance after the curing agent is sprayed; Curing step.

Particularly, in the above-mentioned curing step, when the atmospheric conditions (for example, in the summer, when the atmospheric temperature (25 ° C or higher) is high and the relative humidity is low and windy atmosphere is used, the vinyl, Conversely, if the atmospheric temperature is lower than 25 ℃ and the relative humidity is high, and the wind conditions are low, spray only the curing agent and cure. And spraying with water, covering the upper part with vinyl, curing, etc., and curing while maintaining the wet state. When the atmospheric temperature is lower than 5 占 폚, the method may further include a step of performing thermal curing using vinyl, curing cloth, heat shield, etc. after spraying the curing agent.

Hereinafter, the above-mentioned brooming or primer treatment refers to an operation for facilitating the attachment of the above-mentioned grained steel cement concrete composition to a concrete slab. As the bumming material, at least one selected from styrene butadiene rubber (SBR) latex, polyacrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion is selected, Used as binder. The brooming composition is prepared by mixing cement and fine aggregate in a weight ratio of 1: 0.2 to 2 and polymer binder in an amount of 10 to 70% by weight based on cement for 1 to 5 minutes in a forced mixer or continuous mixer.

The primer material may be selected from at least one selected from the group consisting of SBR (Styrene Butadiene Rubber) latex, polyacrylic ester (PAE), epoxy emulsion, ethyl vinyl acetate (EVA) and acrylic emulsion. .

At this time, the application of the solid content of the primer by lowering the solid content to about 10% by weight is intended to prevent the adhesion performance from deteriorating because the thickness of the film formed when the solid content of the primer exceeds 10% by weight is increased

Hereinafter, embodiments of the present invention will be specifically described.

≪ Example 1 >

Hard hardened cementitious cement concrete composition was prepared by mixing 19% by weight of quick hardwood cementitious binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture in a concrete mixer. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, the fast-hardening hardened steel cement-based binder usually contains 30 wt% of Portland cement, 40 wt% of Auwin cement, 20 wt% of ultra fast cement, 7 wt% of blast furnace slag, 0.5 wt% of natural anhydrous gypsum, , And 1% by weight of cetane and 1% by weight of strontium hydroxide were used as latent heat materials.

≪ Example 2 >

Hard hardened cementitious cement concrete composition was prepared by mixing 19% by weight of quick hardwood cementitious binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture in a concrete mixer. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, the fast-hardening hardened steel cement-based binder usually contains 30 wt% of Portland cement, 45 wt% of Auwin cement, 15 wt% of ultra fast cement, 7 wt% of blast furnace slag, 0.5 wt% of natural anhydrous gypsum, 0.5 wt% , And 1% by weight of cetane and 1% by weight of strontium hydroxide were used as latent heat materials.

≪ Example 3 >

Hard hardened cementitious cement concrete composition was prepared by mixing 19% by weight of quick hardwood cementitious binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture in a concrete mixer. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, the fast-hardened hardened steel cement-based binder usually contains 40 wt% of Portland cement, 35 wt% of Auwin cement, 15 wt% of ultra fast cement, 7 wt% of blast furnace slag, 0.5 wt% of natural anhydrous gypsum, , And 1% by weight of cetane and 1% by weight of strontium hydroxide were used as latent heat materials.

<Example 4>

Hard hardened cementitious cement concrete composition was prepared by mixing 19% by weight of quick hardwood cementitious binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture in a concrete mixer. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, the fast-hardening hardened steel cement-based binder usually contains 45 wt% of Portland cement, 35 wt% of Auwin cement, 10 wt% of ultra fast cement, 7 wt% of blast furnace slag, 0.5 wt% of natural anhydrous gypsum, 0.5 wt% , And 1% by weight of cetane and 1% by weight of strontium hydroxide were used as latent heat materials.

&Lt; Example 5 >

Hard hardened cementitious cement concrete composition was prepared by mixing 19% by weight of quick hardwood cementitious binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture in a concrete mixer. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, the fast-hardened hardened steel cement-based binder usually contains 32 wt% of Portland cement, 40 wt% of Auwin cement, 15 wt% of ultra fast cement, 5 wt% of blast furnace slag fine powder, 0.5 wt% of natural anhydrous gypsum, 5% by weight of high-maltodextrin powder, 1% by weight of cetane and 1% by weight of strontium hydroxide.

For comparison with the properties of Examples 1 to 5, comparative examples were provided to compare concrete properties with the examples of the present invention.

&Lt; Comparative Example 1 &

19% by weight of cement based binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture were mixed and mixed in a concrete mixer to prepare a cement concrete composition. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

The cementitious binder was usually 75 wt% of Portland cement, 17 wt% of ultra fast cement, 7 wt% of blast furnace slag, 0.5 wt% of natural anhydrous gypsum, and 0.5 wt% of anhydrous gypsum.

&Lt; Comparative Example 2 &

19% by weight of cement based binder, 33% by weight of coarse aggregate, 41% by weight of fine aggregate, 5% by weight of water and 2% by weight of admixture were mixed and mixed in a concrete mixer to prepare a cement concrete composition. As the admixture, citric acid 0.5% by weight and lithium carbonate 1.5% by weight were used.

At this time, 45 weight% of Portland cement, 47 weight% of Auwin cement, 7 weight% of blast furnace slag, 0.5 weight% of natural anhydrous gypsum, and 0.5 weight% of anhydrous gypsum were used.

Table 1, Table 2 and Table 3 show the slump change, the compressive strength change and the hydration heat change according to the experimental results of Examples 1 to 5 and Comparative Examples 1 to 2, respectively.

Table 1 below shows the slump changes according to Examples and Comparative Examples.

Slump (cm) Immediately after mixing After 20 minutes Example 1 19 16 Example 2 21 17 Example 3 22 18 Example 4 22 18 Example 5 21 17 Comparative Example 1 17 14 Comparative Example 2 18 14

As shown in Table 1, the quick-hard-aged hardened cement based composition prepared according to the present invention shows good workability.

Table 2 shows changes in compressive strength according to Examples and Comparative Examples.

Compressive strength (MPa) 3 hours 12 hours 1 day 7 days 28th Example 1 26.4 32.5 34.8 38.4 42.9 Example 2 24.8 30.8 31.9 35.9 40.8 Example 3 23.7 28.7 30.4 33.4 38.9 Example 4 22.8 27.3 29.4 32.8 37.2 Example 5 23.6 28.2 31.1 33.6 37.9 Comparative Example 1 18.5 23.8 25.4 30.1 34.2 Comparative Example 2 21.8 25.9 27.8 31.5 35.7

As shown in Table 2, the 12-hour compressive strengths in Examples 1 to 5 according to the present invention indicate compressive strength values capable of driving the vehicle in road pavement or bridge pavement, and are superior to Comparative Examples 1 to 2 Respectively.

Table 3 below shows the maximum temperature of hydration heat generated.

Maximum temperature rise (℃) Example 1 57.8 Example 2 53.4 Example 3 49.2 Example 4 44.9 Example 5 46.9 Comparative Example 1 67.5 Comparative Example 2 60.7

As shown in Table 3, in Examples 1 to 5 according to the present invention, the hydration heat generated in the hydration process by the latent heat reworking is decreased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (6)

5 to 40% by weight of a quick hardened steel cementitious binder, 25 to 65% by weight of a fine aggregate, 10 to 65% by weight of a coarse aggregate, 2 to 25% by weight of water and 0.1 to 5% by weight of an admixture,
Wherein the rapid hardened cementitious cementitious binder comprises 30 to 45% by weight of pulverized Portland cement clinker powder, 30 to 50% by weight of Auwinite quick hard minerals, 10 to 20% by weight of ultra fast cement, 0.1 to 2% by weight of gypsum, To 10% by weight of cetane and 1% by weight of cetane and 1% by weight of strontium hydroxide as latent heat materials. The method according to claim 1,
The powder of the ordinary Portland cement clinker powder is 4500-5800 cm 2 / g, the powder of the slag powder is 6000-8000 cm 2 / g, and the gypsum is a gypsum containing at least one of natural anhydrous gypsum and chemical anhydrous gypsum. Wherein the mixture has a powder viscosity of 5500 to 8500 cm &lt; 2 &gt; / g. delete The method according to claim 1,
The admixture may comprise:
0.1 to 3% by weight of citric acid as a coagulation retarder; And
0.2 to 3% by weight of a compound containing at least one member selected from the group consisting of lithium carbonate, calcium chloride and sodium hydroxide as a curing accelerator;
Wherein the cementitious cementitious cementitious concrete composition is a cementitious cementitious concrete composition. The method according to claim 1,
Wherein the powder further comprises 3 to 8% by weight of a fine silica powder having a pore size of 7500 to 8500 cm &lt; 2 &gt; / g in relation to the quick hardened steel cement composition. As a pavement maintenance method using a quick hardened steel cement composition,
Cutting the road surface using a crusher, a planer, a shot blaster, or the like, and removing blast furnace and impurities;
Cleaning the removed area;
Sprinkling on the cleaned area to maintain the wet state;
Bumming or primer treatment to obtain a high adhesive strength and a waterproofing effect after maintaining the wet state;
5. A method for manufacturing a cementitious cementitious concrete composition, comprising the steps of: applying an artificial cementitious concrete composition according to any one of claims 1, 2, 4 and 5 to an upper portion subjected to brooming or primer treatment;
Spraying a curing agent to prevent evaporation of water at the upper portion after pouring to prevent initial plastic cracking;
Tinning to increase the cracking inducing and sliding resistance after the curing agent is sprayed; And
Curing step,
Here, the curing may include:
Depending on the atmospheric conditions, including the temperature, humidity and wind strength of the site, 1) spray only the curing agent, 2) spray the curing agent, cover the top with vinyl or curing cloth to maintain the wet state, or 3) ) A method for repairing the pavement using an aged steel cement concrete composition, characterized in that the step of curing while maintaining the thermal insulation is applied by using vinyl, curing cloth or heat shield after spraying the curing agent.