KR101217059B1 - Concrete Composition Containing Large Amounts Of Admixture - Google Patents

Abstract

The present invention is to increase the use ratio of admixtures other than cement (fly ash, blast furnace slag powder, electric furnace oxidized slag powder) among binders, and to increase the use ratio of admixtures so that there is no problem such as initial strength, compressive strength, flowability, and construction age of concrete. It relates to a composition.
The present invention is a concrete mixture of cement and fly ash mixed binder, coarse aggregate, fine aggregate and water, wherein the coarse aggregate and fine aggregate is administered according to the value calculated by the conventional concrete mixing design method, unit bonding Discretion 250 ~ 800 ㎏ / ㎥, unit quantity 120 ~ 160 ㎏ / ㎥, fly ash incorporation of 40 to 60wt% of the binder material, high-performance reducing agent is incorporated into 0.5 to 3.0wt% of the binder, air entrainer is the binder It provides a concrete composition with increased admixture utilization, characterized in that it is incorporated in 0.01 ~ 0.1wt% of.

Description

Concrete Composition Containing Large Amounts Of Admixture

The present invention is to increase the use ratio of admixtures other than cement (fly ash, blast furnace slag powder, electric furnace oxidized slag powder) among binders, and to increase the use ratio of admixtures so that there is no problem such as initial strength, compressive strength, flowability, and construction age of concrete. It relates to a composition.

Cement broadly means a substance that bonds a substance to a substance, but generally means an inorganic bond hardener for civil engineering and construction. However, the term 'cement' in the present invention is used in a narrow sense to refer to the 'normal Portland cement (OPC) mainly composed of lime, silica, alumina, etc., the portland cement and fly ash, bottom ash, blast furnace slag, It is known in advance that inorganic binder hardening materials (broad cement) encompassing admixtures such as oxidized slag and loess are widely referred to as 'binders'.

On the other hand, the admixture is used in the planned addition of concrete other than the binder, water and aggregate for the purpose of improving the properties before or after the hardening of concrete. As used to such an extent that it does not affect, it is known in advance that it is described in a concept distinct from the above-described admixture as a binder.

The chemical reaction between cement and water is called the hydration reaction, and the heat generated during the hydration reaction is called the heat of hydration. The thicker the concrete, the greater the amount of heat generated in the interior, the temperature difference between the inside and outside of the concrete member increases, and this temperature difference causes the cracks generated in the concrete, and the occurrence of the cracks greatly impairs the structural function of the concrete that bears the compressive force. Fly ash is generally used in mass concrete and the like to reduce the heat of hydration, mainly used in the amount of less than 30% of the binder weight. Fly ash is a dust collector that collects fine particles of coal generated when coal dust is burned in a coal-fired power plant, etc., when used at a mixing amount less than 30% of the weight of the binder, as well as reducing the heat of hydration and improving the workability of the hardened concrete. In the case of concrete, it has good properties to increase strength, improve watertightness and durability and reduce drying shrinkage in long-term age.

Recently, however, research has been actively conducted to use a large amount of fly ash in terms of effective use of industrial by-products. Accordingly, a compounding design using fly ash up to 80% of a binder weight has been made. In the case of using, there is a problem such as the initial strength of the concrete is lowered, it was necessary to use the compounding to lower the unit quantity in the concrete to 140kg / ㎥ or less to overcome this problem. However, when the unit quantity is lowered, it is difficult to secure fluidity, so the use of a high performance water reducing agent is essential.In the case of using a high performance water reducing agent, the fluidity is improved but the viscosity becomes very large. do.

The present invention has a purpose to provide a concrete composition without significantly problems with the initial strength, compressive strength, flowability, workability of the concrete, while greatly increasing the use of admixtures and minimizing the amount of cement used.

The present invention is a concrete mixture of cement and fly ash mixed binder, coarse aggregate, fine aggregate and water, wherein the coarse aggregate and fine aggregate is administered according to the value calculated by the conventional concrete mixing design method, unit bonding Discretion 250 ~ 800 ㎏ / ㎥, unit quantity 120 ~ 160 ㎏ / ㎥, fly ash incorporation of 40 to 60wt% of the binder material, high-performance reducing agent is incorporated into 0.5 to 3.0wt% of the binder, air entrainer is the binder It provides a concrete composition with increased admixture utilization, characterized in that it is incorporated in 0.01 ~ 0.1wt% of.

In addition, the present invention provides a concrete composition with increased admixture usage rate, characterized in that the fly ash powder degree is 4,000 ~ 8,000 ㎠ / g.

In addition, the present invention provides a concrete composition with increased admixture usage rate, characterized in that less than 20wt% (except 0wt%) of the binder is replaced with blast furnace slag fine powder in cement.

In addition, the present invention provides a concrete composition with a high admixture usage rate, characterized in that less than 5wt% (except 0wt%) of the binder is replaced with fine powder of oxidized slag from cement to electricity.

In addition, the present invention provides a concrete composition with increased admixture usage rate, characterized in that all or part of the fine aggregate to be administered is electrically oxidized slag fine aggregate.

In another aspect, the present invention provides a concrete composition with increased admixture usage rate, characterized in that 0.1 to 3 wt% of the amine compound is further added based on the conventional high performance reducer.

At this time, the high performance sensitizer may be applied to the addition of 2 to 10 wt% of the gluconate compound based on the conventional high performance sensitizer, it may be applied to the addition of 3 to 7 wt% of the nitrite-based compound. .

In another aspect, the present invention provides a concrete composition, characterized in that the refined palm oil is further added 0.5 ~ 5wt% based on the conventional air entrainer.

According to the present invention, the following effects can be obtained.

1. It can reduce the amount of cement used in concrete, and increase the utilization rate of industrial by-products such as fly ash, blast furnace slag fine powder and electric furnace oxide slag fine powder.

2. Fly ash can increase the initial strength of concrete by selecting and applying high powder (4,000 ~ 8,000㎠ / g).

3. By replacing part of cement with blast furnace slag fine powder, it is possible to improve the workability of concrete and improve its compressive strength.

4. By adding amine compound, gluconate compound, and nitrite compound to the general high performance supervisor, the initial strength and compressive strength of concrete can be improved.

5. Further refined palm trees can be added to conventional air entrainers to improve air foaming performance and bubble retention performance.

1 is a graph comparing the initial strength of concrete according to the fly ash powder.
Figure 2 is a graph comparing the compressive strength of each concrete age according to the fly ash powder.
3 is a graph comparing the rate of addition of the high performance water reducing agent according to the blast furnace slag fine powder substitution rate.
4 is a graph comparing the compressive strength of concrete according to the blast furnace slag fine powder replacement rate.
FIG. 5 is a graph comparing mortar's fluidity according to the oxidation rate of fine slag oxide.
Figure 6 is a graph comparing the flow of mortar according to the replacement rate of slag oxide aggregate furnace.
7 is a graph comparing the initial strength of the concrete according to the addition of the amine-based compound alone in the range of 0.1 ~ 5wt% to a conventional high performance water reducing agent.
8 is a graph comparing the compressive strength of the concrete age by adding the amine-based compound alone in the range of 0.1 ~ 5wt% to a conventional high performance water reducing agent.
9 is a graph showing the unit cost increase by adding the amine-based compound alone in the range of 0.1 to 5wt% to a conventional high performance water reducing agent.
10 is a graph comparing the initial strength of the concrete by adding the gluconate compound alone to a conventional high performance sensitizer.
FIG. 11 is a graph comparing the initial strength of concrete by adding 3 wt% of an amine compound to a conventional high performance water reducing agent and further adding a gluconate compound within a range of 2 to 20 wt%.
12 is a comparison of the initial strength of the concrete according to the addition of 3wt% amine compound and 10wt% gluconate compound, and the addition of nitrite-based compound in the range of 1 ~ 10wt to a conventional high-performance supersensitive agent It is a graph.
FIG. 13 is a 28-day compressive strength of concrete according to adding a 3 wt% amine compound and 10 wt% of a gluconate compound and an additional nitrite compound within a range of 1 to 10 wt. This is a graph comparing.
14 is a graph comparing air encapsulation performance and bubble retention performance by adding refined palm oil to a conventional air entrainer within a range of 0.1 to 7 wt%.
FIG. 15 is a graph comparing changes in fluidity of concrete according to addition of refined palm oil within a range of 0.1 to 7 wt% in a conventional air entrainer.

The present invention is a concrete mixture of cement and fly ash mixed binder, coarse aggregate, fine aggregate and water, unit binder amount of 250 ~ 800㎏ / ㎥, unit quantity of 120 ~ 160㎏ / ㎥, fly ash mixing rate of the binder 40 ~ 60 wt%, a high performance reducing agent is incorporated at 0.5 to 3.0 wt% of the binder, an air entrainer is incorporated at 0.01 to 0.1 wt% of the binder, and the air entraining agent is added to the anionic surfactant. As it is, the addition rate of the refined palm tree provides a concrete composition with a high admixture usage rate, characterized in that 0.5 ~ 5wt% compared to 100wt% of the anionic surfactant.

The present invention is intended to significantly reduce the amount of cement used and to reduce the amount of heat of hydration by substituting fly ash for a substantial proportion (40 to 60 wt%) of the amount of cement blended. As a result, in the present invention, since the cement is used in the proportion of 40 to 60wt% of the binder, the heat of hydration of concrete is reduced, but there is a problem in that the initial strength of the concrete decreases due to the large amount of fly ash used. Due to this problem, in the present invention, the unit quantity was lowered to 120 to 160㎏ / ㎥ or less, but when the unit quantity was lowered, the problem of lowering the fluidity of concrete before curing would occur again. In order to improve the workability (workability) of concrete by mixing the air entrainer to 0.01 ~ 0.1wt% of the binder in order to ensure the fluidity by mixing in%, thereby improving the workability problem.

In addition, in the present invention by selecting and blending the fly ash having a high powder degree (surface area, specific surface area relative to the unit weight) to ensure the initial strength of the concrete without sharply lowering the unit quantity. In order to verify the effect of fly ash powder on the initial strength of concrete, the inventor of the present invention has a water binder ratio (W / B), fine aggregate fraction (S / a), quantity (W), cement amount (C), fly After the ash content (FA), fine aggregate amount, coarse aggregate amount within the claims of the present invention, only the fly ash powder is different, the compressive strength test at the early age (3 days, 7 days) Compressive strength test was performed. [Table 1] below is a composite table applying fly ash powder degree of 4,000cm 2 / g, 6,000cm 2 / g, 8,000cm 2 / g, respectively, and applied as a mixed material, [Figure 1] is a concrete according to the powder of the fly ash Figure 2 is a graph comparing the initial strength of, Figure 2 is a graph comparing the compressive strength of the concrete age according to the fly ash powder.

-Fly Ash Powder Formulation Table combination W / B
(wt%) S / a
(wt%) Unit weight (㎏ / ㎥) W C FA SP Fine aggregate Coarse aggregate FA
(4,000) 50.0 50.5 160 176 144 0 891 877 FA
(6,000) 50.0 50.5 160 176 144 0 891 877 FA
(8,000) 50.0 50.5 160 176 144 0 891 877

1 and 2, it can be seen that the larger the fly ash powder, the greater the initial strength of concrete and the compressive strength with age. However, when the fly ash having a powder level of 8,000 cm 2 / g or more is applied, while the amplification of the concrete compressive strength enhancement effect is reduced, there is a problem that it is difficult to obtain a fly ash having a powder degree of 8,000 cm 2 / g or more. Considering that the powder is about 3,200 cm 2 / g, when the cement and fly ash is blended by weight, the volume of the fly ash to be blended is excessively increased, thereby increasing the overall amount of the binder. If there is a freezing phenomenon in the constituent material, there is a concern that the material separation phenomenon due to the dispersibility problem. Therefore, in order to solve the problem of securing the initial strength of the concrete, it is preferable to apply a fly ash powder of 4,000 ~ 8,000 ㎠ / g.

In addition, in the present invention, by replacing a part of the cement in the binder with blast furnace slag fine powder, it is possible to compensate for the problem of lowering the fluidity of the concrete (mortar) due to the lowering of the unit quantity. The inventors of the present invention, in order to verify the effect of the blast furnace slag fine powder replacement rate on the flow of concrete, water binder ratio (W / B), fine aggregate ratio (S / a), quantity (W), cement amount (C), fly ash The same slump expression was achieved by varying only the blast furnace slag fine powder replacement rate (that is, the amount of cement and blast furnace slag fine powder SP) while keeping the amount (FA), fine aggregate amount and coarse aggregate amount within the claims of the present invention. The ratio of high performance reducer added for the purpose of comparison was compared. Table 2 below is a compounding table for the case where the ratio of cement to blast furnace slag fine powder is 0wt%, 10wt% and 20wt%, respectively. to be. In the graph of FIG. 3, the term "replacement rate of blast furnace slag fine powder" is defined as "weight ratio of blast furnace slag fine powder formulated instead of cement in the weight of the whole binder".

 -Combination table by replacement rate of blast furnace slag fine powder combination W / B
(wt%) S / a
(wt%) Unit weight (㎏ / ㎥) W C FA SP Fine aggregate Coarse aggregate SP
(0wt%) 43.8 46.0 140 192 128 0 839 988 SP
(10wt%) 43.8 46.0 140 160 128 32 839 987 SP
(20wt%) 43.8 46.0 140 128 128 64 839 986

In FIG. 3, when the blast furnace slag fine powder substitution rate is 0wt%, the high performance reducing agent addition rate is 0.7wt% compared to the binder, while the blast furnace slag fine powder substitution rate increases to 10wt%, 20wt%, and the high performance reducing agent addition rate is 0.65wt%, It can be seen that the fluidity gradually increases since it gradually decreases to 0.6 wt%. However, since replacing a part of the cement with the blast furnace slag powder may adversely affect the compressive strength of the concrete, the inventors of the present invention confirmed the change in the compressive strength of the concrete according to the blast furnace slag fine powder replacement rate through experiments. ] Is a graph comparing the compressive strength of concrete according to blast furnace slag fine powder replacement rate. As shown in FIG. 4, when the blast furnace slag fine powder replacement rate was 10wt%, both the initial strength of the concrete (age 3 and 7 days) and the compressive strength of the 28-day compressive strength were improved as compared with the case where the blast furnace slag fine powder was not mixed. Able to know. In addition, when the blast furnace slag fine powder replacement rate is 20wt%, the initial strength of the concrete is somewhat lower than when the blast furnace slag fine powder is not mixed, but it can be seen that the 28-day compressive strength is improved. On the other hand, when the blast furnace slag fine powder replacement rate is 30wt%, it can be seen that both the initial strength of the concrete and the 28-day compressive strength of the concrete decrease. Therefore, in consideration of the fluidity, initial strength and compressive strength of concrete as a whole, it is preferable to substitute less than 20wt% (excluding 0wt%) of the binder with cement blast furnace slag powder. In this case, the fly ash in the binder can be blended up to 60wt%, blast furnace slag fine powder up to 20wt%, the cement use ratio can be lowered to 20wt%.

In addition, the present invention can effectively use the industrial by-products by substituting a part of the cement in the binder with the fine powder of oxidized slag, or by applying the oxidized slag fine aggregate to the part or all of the fine aggregate, thereby lowering the unit quantity Therefore, the effect of compensating for the problem of deterioration of the fluidity of concrete (mortar) can be obtained.

 Steel slag generated as a by-product in the conventional steel process has been recognized that it is not suitable for use as concrete aggregate because most of its form contains unstable minerals such as free lime (free-CaO) and is discharged in bulk. Therefore, in order to use the steel slag as aggregate for concrete, a separate processing is required, and as the accompanying processing cost is accompanied by the situation that the economic price does not fit the utilization. However, among steelmaking slag, electric arcfurnace oxidizing slag (hereinafter, referred to as 'electric arc slag') is a by-product generated during the dissolution of stainless steel. Reacts with quicklime mixed with flux to form fine powder impurities, and sorts and shreds the impurities discharged in the final stage to obtain slag whose shape, size and characteristics are very similar to those of fine aggregates in concrete. It will be possible.

FIG. 5 is a graph comparing mortar's fluidity according to the oxidation rate of fine slag oxide. In the graph of FIG. 5, the term "electrically substituted slag fine powder" is defined as "a weight ratio of the electrically charged slag fine powder mixed with cement in the weight of the whole binder". In addition, the graph of [FIG. 5] shows the results of experiments on mortar without coarse aggregate in order to effectively carry out the fluidity test according to the fine powder oxide slag substitution rate.

 As can be seen in FIG. 5, the flow rate of the mortar is improved as the electrical oxidation slag fine powder is replaced with electricity. However, when the electrical oxidation slag fine powder is replaced with electricity, there is a problem of lowering the compressive strength due to the decrease in the amount of cement. (Except 0wt%) is preferably mixed by replacing the fine powder of oxide slag with cement in electricity.

Figure 6 is a graph comparing the flow of mortar according to the replacement rate of slag oxide aggregate furnace. In the graph of FIG. 6, the term "replacement ratio of oxidized slag fine aggregates by electricity" is defined as "weight ratio of oxidized slag fine aggregates by electricity among fine aggregates". In addition, the graph of [6] is the result of experiments on the mortar without the coarse aggregate in order to proceed effectively the fluidity test according to the oxidation slag fine aggregate substitution rate.

As seen in FIG. 6, when the slag fine aggregate substitution rate is 25 wt% or more, the effect of improving the flowability of mortar can be visually obtained. As described above, since the furnace oxide slag fine aggregate is similar in form, size, and characteristics to the general fine aggregate, even if all or part of the fine aggregate is applied to the furnace oxide slag, there is no problem in compressive strength.

On the other hand, high-performance supervisors by electrostatically activating and dispersing the cement particles in the concrete, the cement particles repel each other to improve the workability and to reduce the unit quantity and unit cement amount in order to obtain the desired consistency and strength It is used for the purpose of, and the conventional high performance reducing agent is classified into naphthalene sulfonic acid condensate system, melamine resin sulfonate condensate system, polycarboxylic acid system and the like.

In the conventional high-performance supersensitive agent, the amine-based compound, the gluconate-based compound, and the nitrite-based compound may be added to improve the initial compressive strength of the concrete for 28 days and the maximum. In order to confirm the performance of the high-performance water-reducing agent to which the nitrate-based nitrite-based compound is added, it is a mixing table of the concrete produced within the claims of the present invention.

W / B
(wt%) S / a
(wt%) Unit weight (㎏ / ㎥) W C FA Fine aggregate Coarse aggregate 47.1 48.5 160 204 136 850 922

7 is a graph comparing the initial strength of the concrete by adding the amine compound alone in the range of 0.1 ~ 5wt% to a conventional high performance water sensitizer, Figure 8 is a amine compound to a conventional high performance water sensitizer It is a graph comparing the compressive strength of the concrete according to the age of adding alone in the range of 0.1 ~ 5wt%, [Fig. 9] shows the addition of the amine-based compound alone in the range of 0.1 ~ 5wt% to the conventional high performance It is a graph showing the unit price increase. On the other hand, in the graph of FIG. 7, "addition rate of an amine compound" is defined as "weight ratio of an amine compound added to a normal high performance water reducing agent". According to FIGS. 7 and 8, even when a very small amount of the amine compound is added, the initial strength of concrete (age 3 days) is improved, but the change in compressive strength up to 28 days is different from that of the conventional high performance water reducing agent. It can be seen that there is no significant difference between the case where the amine-based compound is further added within the range of 0.1 to 5 wt% in the conventional high performance water reducing agent. However, FIG. 9 shows that it is difficult to use more than 5wt% of the amine compound when the price increase of the admixture (high performance reducer) is limited to 10%. Therefore, in order to improve the initial strength of the concrete, it is preferable to administer a high performance water reducing agent to which 0.1 to 3 wt% of the amine compound is added, based on the conventional high performance water reducing agent.

On the other hand, [10] is a graph comparing the initial strength of the concrete by adding the gluconate-based compound alone to the conventional high-performance susceptor, [Figure 11] is a 3 wt% addition of the amine compound to the conventional high-performance susceptor , It is a graph comparing the initial strength of concrete according to the addition of the gluconate compound in the range of 2 ~ 20wt%. In the graph of FIG. 10, "gluconate-based compound addition rate" is defined as "weight ratio of the gluconate-based compound added to a normal high performance sensitizer".

10 shows that when the gluconate-based compound alone is added to a conventional high performance sensitizer alone, the initial strength of concrete is rather lowered. However, [FIG. 11] shows that when additionally adding the gluconate compound within the range of 2 to 10 wt% in the state in which 3 wt% of the amine compound is added, the initial strength of the concrete increases, and 20 wt% of the gluconate compound is added. In the case of addition, it can be seen that the initial strength of concrete is lowered again. Therefore, in order to further improve the initial strength of the concrete, it is preferable to administer a high-performance reducing agent added with 2-10 wt% of the gluconate-based compound in addition to 0.1 to 3 wt% of the amine compound based on the conventional high-performance reducing agent.

12 is an initial strength of concrete according to the addition of 3wt% amine compound and 10wt% gluconate compound, and the addition of nitrite-based compound in the range of 1 ~ 10wt to a conventional high-performance supersensitive agent Figure 13 is a graph of the concrete by adding 3wt% amine compound and 10wt% gluconate compound, and the addition of nitrite-based compound in the range of 1 ~ 10wt to a conventional high-performance supersensitive agent This is a graph comparing 28-day compressive strength. In the graph of FIG. 12, "addition rate of nitrite-based compound" is defined as "weight ratio of nitrite-based compound added to a normal high performance water reducing agent".

As shown in FIG. 12, even if the nitrite-based compound is additionally added, there is no significant difference from the high-performance water reducing agent in which only the amine-based compound and the gluconate-based compound are added only in view of the initial strength of concrete. However, FIG. 13 shows that the addition of the nitrite-based compound has an effect of improving the compressive strength of the 28-day old age, and when the 10-wt% of the nitrite-based compound is added, the compressive strength of the 28-day compressive strength decreases. It also shows that. Therefore, the nitrite-based compound can be said to contribute to the improvement of the compressive strength of the concrete, for this purpose, in addition to the addition of 0.1 to 3 wt% of the amine compound, 2 to 10 wt% of the gluconate compound based on the conventional high performance water reducing agent It is preferable to administer a high performance water reducing agent to which 3 to 7 wt% of the compound is added during concrete mixing.

On the other hand, conventional air entraining agent is an admixture mainly composed of anionic surfactants, it is easy and economical to control the amount of air, it improves the durability against concrete freeze-thaw and workability of concrete. These air entrainers have no side effects when used in combination with other admixtures.

The air entrainer applied to the present invention is that refined palm tree is added to the anionic surfactant, and the addition rate of the refined palm tree is 0.5 to 5 wt% relative to 100 wt% of the anionic surfactant. As described above, the air entrainer to which the refined palm tree is added to the anionic surfactant may ensure stable bubble generation and bubble retention performance without affecting the concrete properties. Table 4 below is a compounding table of the concrete produced within the claims of the present invention to confirm the performance of the air entrainer to which refined palm oil is added.

W / B
(wt%) S / a
(wt%) Unit weight (㎏ / ㎥) W C FA Fine aggregate Coarse aggregate 47.1 48.5 160 204 136 850 922

FIG. 14 is a graph comparing air encapsulation performance and bubble retention performance by adding purified palm oil to anionic surfactant within a range of 0.1 to 7 wt%, and FIG. 15 is a graph showing the air entraining agent in the anionic surfactant. This is a graph comparing the fluidity change of concrete by adding refined palm oil within the range of 0.1 ~ 7wt%. In FIG. 14, when the refined palm oil is added in the range of 0.5 to 5 wt% based on the anionic surfactant, air foaming performance and bubble holding performance are shown to be good, and in FIG. 15, the refined palm oil is added to 7 wt%. When it is confirmed that the fluidity of the elapsed time is greatly reduced. Therefore, it is preferable to add 0.5-5wt% of refined palm oil based on the anionic surfactant during concrete mixing.

none

Claims (9)

Concrete mixed with cement, fly ash, binder, coarse aggregate, fine aggregate and water,
Unit binder content 250 ~ 800㎏ / ㎥, unit quantity 120 ~ 160㎏ / ㎥, fly ash incorporation rate of the binder is blended 40 ~ 60wt%,
High performance reducing agent is incorporated in 0.5 ~ 3.0wt% of the binder,
Air entrainer is incorporated in 0.01 ~ 0.1wt% of the binder,
The air entrainer is a refined palm tree is added to the anionic surfactant, the addition rate of the refined palm tree is a concrete composition with a high admixture usage rate, characterized in that 0.5 ~ 5wt% compared to 100wt% of the anionic surfactant.
In claim 1,
The fly ash has a powder degree of 4,000 ~ 8,000 cm 2 / g concrete composition, characterized in that the increased use of admixtures.
In claim 1,
The concrete composition with a high admixture usage rate, characterized in that 20wt% or less (excluding 0wt%) of the binder is substituted with blast furnace slag fine powder in cement.
In claim 1,
Concrete composition with a higher utilization of the admixture, characterized in that less than 5wt% (except 0wt%) of the binder is replaced with fine powder of oxidized slag from cement to electricity.
In claim 1,
All or part of the fine aggregate to be administered is a concrete composition with a high admixture usage rate, characterized in that the fine oxidized slag fine aggregate.
6. The method according to any one of claims 1 to 5,
The high performance reducer is an amine compound is added to the conventional high performance reducer,
The conventional high performance reducing agent is any one selected from naphthalene sulfonic acid condensate-based water reducing agent, melamine resin sulfonate condensate-based water reducing agent and polycarboxylic acid-based water reducing agent,
The addition rate of the amine compound is a concrete composition having a high admixture usage rate, characterized in that 0.1 ~ 3wt% compared to 100wt% of the conventional high performance water reducing agent.
The method of claim 6,
Wherein the high-performance susceptor is a concrete composition with increased admixture, characterized in that 2 to 10wt% of the gluconate compound is added based on the conventional high performance susceptor.
In claim 7,
The high performance water reducing agent is a concrete composition with increased admixture use, characterized in that 3 to 7wt% of the nitrite-based compound is added based on the conventional high performance water reducing agent. delete

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