KR20180009260A - Mixture of early strength for cement concrete including calcium compound and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a high-early strength mixture for cement concrete and to a production method therefor, wherein the high-early strength mixture contains a calcium compound, a metal oxide, a hydroxide of an alkali metal and the like, a dispersant and water. In addition, by containing the calcium compound, and the like, the high-early strength mixture for cement concrete, according to the present invention, is useful for industrial by-product recycling, is economical and may enable saving energy by enabling cement content to be reduced, and is environmentally friendly by enabling the mitigation of environmental pollution by reducing carbon dioxide production. By being added to a cement concrete mixture, the high-early strength mixture has the effect of enabling the cement concrete to exhibit a higher early strength.

Description

TECHNICAL FIELD The present invention relates to a crude steel mixture for cement concrete containing calcium compounds and a method for producing the same, and a method for producing the same. BACKGROUND ART < RTI ID = 0.0 > [0002]

The present invention relates to a crude steel mixture for cement concrete, and more particularly, to a method for preparing a crude steel mixture for cement concrete, which comprises adding a crude steel mixture containing a calcium compound to a cement concrete mixture, .

Recently, cement prices have risen as cement production decreases, while industrial by-products such as fly ash and blast furnace slag have been generated more than 20 million tons a year. Therefore, it is required to reduce the proportion of cement, which is an important material in the production of concrete, and to use cheap industrial byproducts as a substitute for cement. The amount of such industrial byproducts is increasing year by year, and is more preferable as a substitute for cement. However, when industrial byproducts are applied, the early strength of concrete decreases. Therefore, the necessity of the crude steel additive to solve this problem is increasing.

Several methods have been proposed to express the strength of cement concrete in the early stage, and they have been selectively used according to their advantages and disadvantages.

Korean Patent No. 10-120942 discloses a method of adjusting the strength by making the concrete with the unsupported concrete. However, there is a problem that the cost of construction increases greatly due to an increase in the material cost due to an increase in the amount of cement and an increase in the amount of additional aggregate and the like.

Korean Patent No. 10-615826 discloses a condensation-promoting admixture composition and an early strength-expressing concrete composition containing the same. Such a concrete composition has a relatively low factor of increase in unit cost and can be applied easily. However, since there are many compositions of an admixture, there is a possibility that a change in physical properties is likely to occur and a performance deterioration may occur, and a concrete property change (air quantity, slump) There is a disadvantage that quality control is not easy in the field due to quality fluctuation.

Korean Patent No. 10-120942 Korean Patent No. 10-615826

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and provides a crude steel mixture for cement concrete which can contain calcium oxide, The purpose.

It is another object of the present invention to provide a method for producing a crude steel mixture for cement concrete.

In order to achieve the above object, the present invention provides a crude steel mixture for cement concrete,

100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate,

0.1 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, still more preferably 0.1 to 50 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium, 30 parts by weight,

A hydroxide of an alkali metal or an alkaline earth metal, triethanolamine or a mixture thereof, preferably 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight,

1 to 50 parts by weight, preferably 5 to 30 parts by weight, of a dispersant, and

50 to 600 parts by weight, preferably 150 to 450 parts by weight of water,

Preferably 0.1 to 10 parts by weight, more preferably 1 to 10 parts by weight, and even more preferably 3 to 8 parts by weight per 100 parts by weight of the cement of the cement concrete, Is given.

Further, the crude steel mixture for cement concrete of the present invention contains, per 100 parts by weight of the calcium compound,

A hydration reaction promoter selected from the group consisting of an alkali metal or alkaline earth metal acetate, a formate, a nitrate, a nitrite, a sulfate, a thiosulfate, a carbonate, a chloride, a halide, an alkanolamine, a chloride, a calcium aluminate silicate, Preferably an alkali metal or an alkaline earth metal nitrate, more preferably 1 to 50 parts by weight, and preferably 5 to 30 parts by weight, of calcium nitrate.

Further, the crude steel mixture for cement concrete of the present invention contains, per 100 parts by weight of the calcium compound,

0.01 to 5 parts by weight of cement may be further included.

Further, the crude steel mixture for cement concrete of the present invention contains, per 100 parts by weight of the calcium compound,

10 to 100 parts by weight, preferably 20 to 70 parts by weight, of a silica compound selected from the group consisting of fly ash, bottom ash, silica fume, silica, silicate, water glass, slag and mixtures thereof.

Further, the crude steel mixture for cement concrete of the present invention contains, per 100 parts by weight of the calcium compound,

And 0.1 to 20 parts by weight of calcium silicate hydrate.

The average particle diameter of the calcium compound may be 0.01 to 100 占 퐉, preferably 0.01 to 50 占 퐉, more preferably 0.01 to 30 占 퐉.

The average particle diameter of the cement may be 0.01 to 100 占 퐉, preferably 0.01 to 50 占 퐉, more preferably 0.01 to 30 占 퐉.

The average particle diameter of the silica compound may be 0.01 to 100 占 퐉, preferably 0.01 to 50 占 퐉, more preferably 0.01 to 30 占 퐉.

The solid content of the crude steel mixture for cement concrete is 10 to 80% by weight, preferably 20 to 70% by weight, more preferably 30 to 60% by weight, further preferably 40 to 55% by weight, By weight and 45 to 55% by weight.

Further, the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,

0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of the wetting agent.

Further, the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,

0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a thickening agent.

Further, the crude steel mixture for cement concrete of the present invention contains, per 100 parts by weight of the calcium compound,

0.001 to 5 parts by weight, preferably 0.1 to 5 parts by weight, of the antifoaming agent.

In addition, the viscosity of the crude steel mixture for cement concrete may be 100 to 3000 cPs.

Also, the annual viscosity change of the crude steel mixture for cement concrete may be 0 to 1000 cPs.

Also, the pH of the crude steel mixture for cement concrete may be 10 to 14.

Meanwhile, the method for producing a crude steel mixture for cement concrete according to the present invention comprises

(A) 100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate,

0.1 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, still more preferably 0.1 to 50 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium, 30 parts by weight,

1 to 50 parts by weight, preferably 5 to 30 parts by weight, of a dispersant, and

Mixing 50 to 600 parts by weight, preferably 150 to 450 parts by weight of water to prepare a subject;

(B) Per 100 parts by weight of the calcium compound,

A hydroxide of an alkali metal or an alkaline earth metal, triethanolamine or a mixture thereof, preferably 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight,

Mixing 1 to 50 parts by weight, preferably 10 to 50 parts by weight of water to prepare an adjuvant; And

(C) And mixing the subject matter with an auxiliary agent.

Further, the method for producing a crude steel mixture for cement concrete of the present invention

In step (A)

A compound selected from the group consisting of silicon, aluminum, iron, magnesium, an oxide thereof, and a mixture thereof after mixing a compound selected from the group consisting of silicon, aluminum, iron, magnesium, And pulverizing the calcium compound to have an average particle diameter of 0.01 to 100 mu m.

Further, the method for producing a crude steel mixture for cement concrete of the present invention

After step (C)

The method may further comprise maintaining the mixture of the subject and the adjuvant at 5 to 100 캜, preferably 60 to 80 캜, for 0.5 to 24 hours, preferably 0.5 to 12 hours.

In addition, the mixing of step (C) may be to add the subject as an adjuvant, or to add the adjuvant as a subject.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

A hydration reaction promoter selected from the group consisting of an alkali metal or alkaline earth metal acetate, a formate, a nitrate, a nitrite, a sulfate, a thiosulfate, a carbonate, a chloride, a halide, an alkanolamine, a chloride, a calcium aluminate silicate, Preferably an alkali metal or an alkaline earth metal nitrate, more preferably 1 to 50 parts by weight, and preferably 5 to 30 parts by weight, of calcium nitrate.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

0.01 to 5 parts by weight of cement may be further included.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

10 to 100 parts by weight, preferably 20 to 70 parts by weight, of a silica compound selected from the group consisting of fly ash, bottom ash, silica fume, silica, silicate, water glass, slag and mixtures thereof.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

And 0.1 to 20 parts by weight of calcium silicate hydrate.

In the method for producing a crude steel mixture for cement concrete according to the present invention, when the calcium compound is crushed during the step (A), the cement may be crushed together with the crushed cement having an average particle diameter of 0.01 to 100 μm, Preferably 0.01 to 50 mu m, more preferably 0.01 to 30 mu m.

In the method for producing a crude steel mixture for cement concrete according to the present invention, the silica compound may be pulverized together with the silica compound when the calcium compound is pulverized during step (A), and the average particle diameter of the silica compound after pulverization is from 0.01 to 100 Mu] m, preferably 0.01 to 50 [mu] m, and more preferably 0.01 to 30 [mu] m.

The solid content of the crude steel mixture for cement concrete is 10 to 80% by weight, preferably 20 to 70% by weight, more preferably 30 to 60% by weight, further preferably 40 to 55% by weight, By weight and 45 to 55% by weight.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of the wetting agent.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a thickening agent.

The present invention also provides a process for preparing a crude steel mixture for cement concrete,

0.001 to 5 parts by weight, preferably 0.1 to 5 parts by weight, of the antifoaming agent.

Further, the crude steel mixture for cement concrete of the present invention is characterized by being produced by the above-mentioned method.

The present invention relates to the recycling of industrial byproducts by using calcium oxide, calcium hydroxide, calcium carbonate, etc., and it is possible to lower the content of cement, thereby reducing costs and saving energy and reducing environmental pollution by reducing the generation of carbon dioxide . Also, the present invention can improve the work efficiency such as shortening the construction period because the early strength of the concrete can be expressed at a low cement content by using the crude steel mixture, and it can be expected that the use of recycled aggregate such as industrial by- It is possible to solve the problem of deterioration of concrete quality.

Hereinafter, preferred embodiments of the present invention will be described in detail.

Prior to this description, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and the contents described in this specification do not necessarily represent the technical ideas of the present invention, It should be understood that there may be many variations that can be substituted for these. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The crude steel mixture for cement concrete according to a preferred embodiment of the present invention may be a compound selected from the group consisting of calcium compounds selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and mixtures thereof, silicon, aluminum, iron, magnesium, , Hydroxides of alkali metals or alkaline earth metals, triethanolamine or mixtures thereof, dispersants, and water.

Wherein the crude steel mixture for cement concrete contains 100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and a mixture thereof and is selected from the group consisting of silicon, aluminum, iron, magnesium, , 0.1 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, and even more preferably 0.1 to 30 parts by weight of the compound, the hydroxide of the above alkali metal or alkaline earth metal, triethanolamine Or a mixture thereof, preferably 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight, of sodium hydroxide. And 1 to 50 parts by weight, preferably 5 to 30 parts by weight, of the dispersant, and the water contains 50 to 600 parts by weight, preferably 150 to 450 parts by weight. The crude steel mixture for cement concrete according to the present invention is used in an amount of 0.1 to 10 parts by weight, preferably 0.5 to 10 parts by weight, more preferably 1 to 10 parts by weight, more preferably 3 to 8 parts by weight, By weight, to give the cement concrete a toughness.

The group consisting of calcium oxide, calcium hydroxide, calcium carbonate and mixtures thereof promotes the formation of calcium silicate hydrate by activating the base during the curing and curing of the cement. In the above group, calcium oxide absorbs water and carbon dioxide and is decomposed into calcium hydroxide and calcium carbonate.

The most important feature of the present invention is to provide a crude steel mixture using low-cost raw materials. Therefore, the calcium compound has a low purity and necessarily contains an oxide of a metal such as silicon, aluminum, iron, magnesium, etc. The content of these oxides is 0.1 to 200 parts by weight, preferably 0.1 to 200 parts by weight, To 100 parts by weight, more preferably 0.1 to 50 parts by weight, still more preferably 0.1 to 30 parts by weight. If the content of the oxide is less than 0.1 part by weight, it is not a raw material intended for the present invention because it is a high-priced raw material having a high purity and is not a low-priced raw material mentioned above. Conversely, if the content exceeds 200 parts by weight, This is not done properly.

The alkali metal or alkaline earth metal hydroxides, triethanolamine, or mixtures thereof, which is one of the major constituents of the instant steel mixture of the present invention, provide a basic environment for cementing and curing the cement. The content of the basic substance may be 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight per 100 parts by weight of the calcium compound. If the content of the basic substance is less than 0.5 parts by weight, the production rate of the present invention crude starch mixture is too low to take too long to produce. On the other hand, if the content of the basic substance exceeds 30 parts by weight, And the workability such as putting on the scene is lowered.

The dispersant inhibits intergranular aggregation of calcium compounds, metal oxides, basic substances and the like constituting the crude steel mixture of the present invention and allows the particles to be separated from each other by electrostatic or physical repulsive force. Through this, uniform strength is exhibited in the entire area of cement concrete, and sufficient workability can be ensured while reducing the amount of water to be blended. The content of such a dispersant may be 1 to 50 parts by weight, preferably 5 to 30 parts by weight, per 100 parts by weight of the calcium compound. If the content of the dispersing agent is less than 1 part by weight, the viscosity of the crude steel mixture becomes excessively high, making it difficult to use and manufacture. Conversely, if the content exceeds 50 parts by weight, not only the economical efficiency is deteriorated but also the constituents of the crude steel mixture are phase- In addition, in order to solve this problem, the defoaming agent may be used in an undesirable manner. In addition, a large amount of the dispersing agent may cause deterioration of the early strength of the concrete.

The content of the water may be 50 to 600 parts by weight, preferably 150 to 450 parts by weight, per 100 parts by weight of the calcium compound. If the content of water is less than 50 parts by weight, the viscosity of the crude steel mixture becomes excessively high, which makes it difficult to use and manufacture. On the other hand, if the water content exceeds 600 parts by weight, the cost of logistics is increased and phase separation among the components of the crude steel mixture may occur.

Further, the crude steel mixture for cement concrete according to the present invention may contain, per 100 parts by weight of the calcium compound, at least one selected from the group consisting of nitrates, formates, nitrates, nitrates, sulfates, thiosulfates, carbonates, chlorides, halides, alkanolamines, Preferably from 1 to 50 parts by weight, preferably from 5 to 30 parts by weight, of a hydration reaction promoter selected from the group consisting of iron chloride, calcium aluminate silicate, and mixtures thereof, preferably an alkali metal or alkaline earth metal nitrate, more preferably calcium nitrate May be further included. When the content of the hydration reaction promoter is within the above range, a proper hydration reaction rate can be ensured and desired early strength can be obtained.

The hydration reaction promoter weakens the coating around the calcium silicate hydrate and accelerates its crystal growth so that condensation and curing of the cement can proceed easily. These compounds are activated by the above-mentioned calcium compounds to participate in the reaction. Examples of such hydration reaction accelerators include sodium acetate, calcium acetate, potassium acetate, acetic acid salt, alkanolamine, formic acid, calcium formate and formate salts as organic components. Examples of inorganic components include calcium nitrate, calcium nitrite, calcium chloride, Calcium iodide, soluble calcium salt, iron chloride, magnesium chloride, sodium chloride, sulfate, potassium hydroxide, carbonate, thiosulfate, calcium aluminate silicate and the like.

Further, the crude steel mixture for cement concrete of the present invention may further include 0.01 to 5 parts by weight of cement per 100 parts by weight of the calcium compound so that the quick-setting steel performance can be exhibited. When the content of the cement is within the above range, it is possible to express the steel-making performance more quickly as described above.

In order to accelerate the formation of calcium silicate hydrate by activating the base during the curing and curing process of the cement concrete, the crude steel mixture for cement concrete according to the present invention may contain at least one component selected from the group consisting of fly ash, bottom ash, silica fume, silica, 10 to 100 parts by weight, preferably 20 to 70 parts by weight, of a silica compound selected from silicates, water glasses, slag, and mixtures thereof. In addition, 0.1 to 20 parts by weight of calcium silicate hydrate may be further added per 100 parts by weight of the calcium compound for acting as a condensation nucleus in the condensation and curing process of the cement. When the content of the silica compound and the calcium silicate hydrate is within the above range, the reaction rate of concrete can be appropriately maintained, and it is possible to obtain a desired early strength.

The average particle diameter of the calcium compound, the cement and the silica compound may be 0.01 to 100 탆, preferably 0.01 to 50 탆, more preferably 0.01 to 30 탆, independently of each other. These particles have a fine size as described above, thereby increasing the filling rate. As a result, not only the early strength is manifested but also the compressive strength of the final concrete structure (mold) is increased. When the average particle diameter is within the above range, high strength can be exhibited due to a high filling rate effect, and aggregation and phase separation due to static electricity can be prevented, thereby ensuring stability of the product.

The solid content of the crude steel mixture for cement concrete is 10 to 80% by weight, preferably 20 to 70% by weight, more preferably 30 to 60% by weight, further preferably 40 to 55% by weight, May be from 45 to 55% by weight. When the solid content is within the above range, it is possible to lower the cost of logistics while exhibiting desired performance of the steel making.

The crude steel mixture for cement concrete may further contain 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of the wetting agent per 100 parts by weight of the calcium compound. The wetting agent reduces the surface tension of the particles and spreads the water on the surface. When the content of the wetting agent is within the above range, the wetting agent can secure an adequate range of steel-making performance in consideration of economical efficiency.

The crude steel mixture for cement concrete may further contain 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a thickener per 100 parts by weight of the calcium compound. When the content of the thickener is within the above range, it is possible to ensure a suitable viscosity which allows smooth work while suppressing the phase separation of the constituent components.

Further, the crude steel mixture for cement concrete of the present invention may further contain 0.001 to 5 parts by weight, preferably 0.1 to 5 parts by weight, of a defoaming agent per 100 parts by weight of the calcium compound. When the content of the antifoaming agent is within the above range, it is possible to suppress the strength reduction due to the bubbles in the cement concrete while considering the economical efficiency.

The antifoaming agent is used to remove air bubbles generated when components constituting the crude steel mixture for cement concrete of the present invention are mixed. When bubbles are generated in the crude steel mixture for cement concrete, the strength of the concrete may be reduced.

In addition, the viscosity of the crude steel mixture for cement concrete may be 100 to 3000 cPs. When the viscosity is within the above range, it is possible to smoothly perform work while suppressing the phase separation of the constituent components, thereby ensuring an appropriate level of workability.

Also, the annual viscosity change of the crude steel mixture for cement concrete may be 0 to 1000 cPs. When the annual viscosity change amount is 1000 cPs or less, an appropriate range of merchantability can be secured.

Also, the pH of the crude steel mixture for cement concrete may be 10 to 14. When the pH is within the above range, a hydration reaction at a high rate can be expressed, which is preferable.

The crude steel mixture of the present invention is mixed with 0.1 to 10 parts by weight, preferably 0.5 to 10 parts by weight, more preferably 1 to 10 parts by weight, and still more preferably 3 to 8 parts by weight per 100 parts by weight of cement of cement concrete . If the amount added to cement concrete is less than 0.1 parts by weight per 100 parts by weight of cement, the strength of the concrete is not sufficiently exhibited. Conversely, if it exceeds 10 parts by weight, problems such as cracking and bleeding may occur due to heat generation of concrete.

Meanwhile, a method of manufacturing a crude steel mixture for cement concrete according to a preferred embodiment of the present invention includes:

(A) 100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and mixtures thereof; 0.1 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight, still more preferably 0.1 to 50 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium, 30 parts by weight; 1 to 50 parts by weight, preferably 5 to 30 parts by weight, of a dispersant; And 50 to 600 parts by weight, preferably 150 to 450 parts by weight of water to prepare a subject;

(B) 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight, of a hydroxide of an alkali metal or an alkaline earth metal, triethanolamine or a mixture thereof, preferably sodium hydroxide, per 100 parts by weight of the calcium compound; Mixing 1 to 50 parts by weight, preferably 10 to 50 parts by weight of water to prepare an adjuvant; And

(C) mixing the subject matter with an adjuvant.

The method for preparing a crude steel mixture for cement concrete according to the present invention comprises the steps of mixing 100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and a mixture thereof, And 0.1 to 200 parts by weight, preferably 0.1 to 100 parts by weight, more preferably 0.1 to 50 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium, More preferably from 0.1 to 30 parts by weight, per 100 parts by weight of the composition. Mixing the mixture with 1 to 50 parts by weight, preferably 5 to 30 parts by weight of a dispersing agent, and 50 to 600 parts by weight, preferably 150 to 450 parts by weight, of a dispersing agent.

The calcium compound may be further pulverized so as to have an average particle diameter of 0.01 to 100 탆, preferably 0.01 to 50 탆, more preferably 0.01 to 30 탆, during the step of manufacturing the subject matter.

Separately from the preparation of the subject matter, per 100 parts by weight of the calcium compound, a hydroxide of an alkali or alkaline earth metal, triethanolamine or a mixture thereof, preferably 0.5 to 30 parts by weight, preferably 2 to 20 parts by weight, To 50 parts by weight, and preferably from 10 to 50 parts by weight, of the composition is mixed to prepare an auxiliary agent.

When the subject and adjuvant are manufactured, they are mixed. The mixing may be to add the subject as an adjuvant, or to drop the adjuvant on a subject.

The step of maintaining the mixture of the subject and the adjuvant at 5 to 100 DEG C, preferably at 60 to 80 DEG C for 0.5 to 24 hours, preferably 0.5 to 12 hours, . When the holding temperature and the holding time are within the above range, vaporization of water can be prevented and the reaction can be sufficiently advanced while maintaining economical efficiency, thereby ensuring the performance and stability of the instant invention crude steel mixture.

The method for producing a crude steel mixture for cement concrete according to the present invention is characterized in that the above-mentioned subject matter contains, per 100 parts by weight of the calcium compound, an alkali metal or alkaline earth metal nitrate, formate, nitrate, nitrite, sulfate, thiosulfate, carbonate, Preferably from 1 to 50 parts by weight of a hydration reaction promoter selected from the group consisting of hydrocarbons, cargoes, alkanolamines, iron chloride, calcium aluminate silicates, and mixtures thereof, preferably an alkali metal or alkaline earth metal, more preferably calcium nitrate May further comprise 5 to 30 parts by weight.

The method for preparing a crude steel mixture for cement concrete according to the present invention may further include 0.01 to 5 parts by weight of cement per 100 parts by weight of the calcium compound.

The method for producing a crude steel mixture for cement concrete according to the present invention is characterized in that the above-mentioned subject matter contains, per 100 parts by weight of the calcium compound, silica selected from the group consisting of fly ash, bottom ash, silica fume, silica, silicate, water glass, 10 to 100 parts by weight, preferably 20 to 70 parts by weight, of the compound.

The method for preparing a crude steel mixture for cement concrete according to the present invention may further comprise 0.1 to 20 parts by weight of calcium silicate hydrate per 100 parts by weight of the calcium compound.

Further, in the method for producing a crude steel mixture for cement concrete according to the present invention, the cement may be crushed together with the calcium compound during crushing the calcium compound during the production of the subject matter. The crushed cement has an average particle diameter of 0.01 to 100 탆, Preferably 0.01 to 50 mu m, more preferably 0.01 to 30 mu m.

In the method for producing a crude steel mixture for cement concrete according to the present invention, when the calcium compound is pulverized during the production of the subject matter, the silica compound may also be pulverized together, and the average particle diameter of the silica compound after pulverization is 0.01 - 100 mu m, preferably 0.01 to 50 mu m, and more preferably 0.01 to 30 mu m.

The method for preparing a crude steel mixture for cement concrete according to the present invention may further include 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a wetting agent per 100 parts by weight of the calcium compound.

The method for producing a crude steel mixture for cement concrete according to the present invention may further include 0.001 to 5 parts by weight, preferably 0.01 to 1 part by weight, of a thickener per 100 parts by weight of the calcium compound.

The method for preparing a crude steel mixture for cement concrete according to the present invention may further include 0.001 to 5 parts by weight, preferably 0.1 to 5 parts by weight, of a defoaming agent per 100 parts by weight of the calcium compound.

Further, the crude steel mixture for cement concrete of the present invention is characterized by being produced by the above-mentioned method.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples. However, the following Examples are intended to illustrate the present invention and are not to be construed as limiting the scope of the present invention.

Example

Example 1: Preparation of crude steel mixture (1)

150 g of calcium hydroxide, 20 g of calcium nitrate, and 7 g of a dispersant (Aegis, Korea) were added to 200 g of water and ground to an average particle size of 5 탆 to prepare a subject. Adjuvants were prepared by adding 15 g of sodium hydroxide to 15 g of water separately from the subject. The above-mentioned subject matter was placed in a flask, the auxiliary agent was added dropwise, and the mixture was stirred at 70 DEG C for 8 hours to prepare a crude steel mixture for cement concrete according to the present invention.

Example 2: Preparation of crude steel mixture (2)

The same procedure as in Example 1 was carried out, and the dispersant was added dropwise at the time of preparing the subject to prepare a crude steel mixture for cement concrete of the present invention.

Example 3: Preparation of crude steel mixture (3)

150 g of slaked lime and 7 g of a dispersant (Aegis, Korea) were added to 200 g of water and ground to an average particle diameter of 5 탆 to prepare a subject. Adjuvants were prepared by adding 15 g of sodium hydroxide to 50 g of water separately from the subject. Then, 20 g of calcium nitrate was added to 30 g of water and ground to an average particle diameter of 5 탆 to prepare an aqueous calcium nitrate solution. The above-mentioned subject matter was placed in a flask, the auxiliary agent and an aqueous solution of calcium nitrate were added dropwise, and the mixture was stirred at 70 캜 for 8 hours to prepare a crude steel mixture for cement concrete of the present invention.

Production Examples 1 to 7: Preparation of Cement Mortar

Cement mortar was prepared in the mixing ratio shown in Table 1 below. (Water reducing agent: Aegis, Korea)

Test Example 1: Compressive Strength Change of Cement Mortar According to Composition Variation

The compressive strength of the cement mortar prepared in Preparation Examples 1 to 6 was measured according to the addition of the crude steel mixture. The measurement was carried out after curing for 24 hours at a temperature of 15 ° C and a relative humidity of 60%, and the results are shown in Table 2.

Test Example 2: Compressive Strength Change of Cement Mortar with Temperature

The cement mortar prepared in Preparation Examples 1 to 6 was measured for compressive strength according to the curing temperature of the crude steel mixture. The measurement was carried out after curing for 24 hours at a relative humidity of 60%, and the results are shown in Table 3.

The results of Test Examples 1 and 2 show that when the amount of cement is the same, a premature compression strength value is obtained by adding the crude steel mixture of the present invention.

Production Examples 8 to 13: Preparation of cement concrete

Cement concrete was prepared by mixing ratios shown in Table 4 below. (Water reducing agent: Aegis, Korea)

Test Example 3: Compressive Strength Change of Cement Concrete According to Composition Variation

The compressive strength of the cement concrete prepared in Preparation Examples 8 to 13 was measured according to the addition of the crude steel mixture. The measurement was carried out after curing for 24 hours at a temperature of 15 ° C and a relative humidity of 60%, and the results are shown in Table 5.

The results of Test Example 3 show that when the amount of cement is the same, a higher early compression strength value is obtained by adding the crude steel mixture of the present invention.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course it is possible. Accordingly, the scope of the present invention should not be construed as being limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the following claims.

Claims (14)

100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate,
0.1 to 200 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium,
0.5 to 30 parts by weight of a hydroxide of an alkali metal or an alkaline earth metal, triethanolamine or a mixture thereof,
1 to 50 parts by weight of a dispersant, and
50 to 600 parts by weight of water,
And 0.1 to 10 parts by weight per 100 parts by weight of cement concrete is mixed to impart rigidity to the cement concrete. The method according to claim 1,
Wherein the crude steel mixture for cement concrete contains an alkali metal or an alkaline earth metal per 100 parts by weight of an alkali metal or an alkaline earth metal such as a nitrate, Wherein the composition further comprises from 1 to 50 parts by weight of a silicate, a silicate, and a mixture thereof. The method according to claim 1,
Wherein the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,
Characterized in that it further comprises 10 to 100 parts by weight of a silica compound selected from the group consisting of fly ash, bottom ash, silica fume, silica, silicate, water glass, slag and mixtures thereof. The method according to claim 1,
Wherein the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,
Characterized in that it further comprises 0.1 to 20 parts by weight of calcium silicate hydrate. The method according to claim 1,
Wherein the calcium compound has an average particle diameter of 0.01 to 100 占 퐉. The method according to claim 1,
Wherein the solid content of the crude steel mixture for cement concrete is 10 to 80% by weight. The method according to claim 1,
Wherein the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,
Characterized in that the composition further comprises 0.001 to 5 parts by weight of a thickener. The method according to claim 1,
Wherein the crude steel mixture for cement concrete contains, per 100 parts by weight of the calcium compound,
And 0.001 to 5 parts by weight of an antifoaming agent. (A) 100 parts by weight of a calcium compound selected from the group consisting of calcium oxide, calcium hydroxide, calcium carbonate and mixtures thereof,
0.1 to 200 parts by weight of a compound selected from the group consisting of silicon, aluminum, iron, magnesium, oxides and mixtures thereof,
1 to 50 parts by weight of a dispersant,
Mixing 50 to 600 parts by weight of water to prepare a subject;
(B) per 100 parts by weight of the calcium compound,
0.5 to 30 parts by weight of a hydroxide of an alkali metal or an alkaline earth metal, triethanolamine or a mixture thereof,
Mixing 1 to 50 parts by weight of water to prepare an adjuvant; And
(C) mixing the above-mentioned subject matter with an auxiliary agent to prepare a crude steel mixture for cement concrete. The method of claim 9,
In step (A)
A compound selected from the group consisting of silicon, aluminum, iron, magnesium, an oxide thereof, and a mixture thereof after mixing a compound selected from the group consisting of silicon, aluminum, iron, magnesium, A method for producing a crude steel mixture for cement concrete, comprising the step of pulverizing a calcium compound to an average particle diameter of 0.01 to 100 mu m. The method of claim 9,
In the subject of step (A)
A nitrate, a nitrite, a sulfate, a thiosulfate, a carbonate, a chloride, a halide, an alkanolamine, a chloride, a calcium aluminate silicate, and a mixture thereof in an amount of 1 part by weight per 100 parts by weight of the calcium compound To 50 parts by weight of the crude steel mixture. The method of claim 9,
After step (C)
Further comprising the step of maintaining the mixture of the subject matter and the adjuvant at 5 to 100 占 폚 for 0.5 to 24 hours. The method of claim 9,
Wherein the mixing of the step (C) is carried out by adding the base material as an auxiliary agent or by adding an auxiliary agent to the base material. A premixed mixture for cementitious concrete, characterized in that it is produced by the method of any one of claims 9 to 13.