KR101137717B1 - Concrete composition making method with milling stone - Google Patents

Abstract

Room temperature strength, including stone powder, which exhibits strength at room temperature by applying a non-plastic binder composed of an appropriate ratio of stone powder, blast furnace slag, fly ash, and an alkali-activating sodium-based alkaline inorganic material and sodium silicate, without using any cement. Disclosed is a method for preparing an expressive concrete composition.

The weight ratio of the binder and the alkali activator is to be formed in 60:40 ~ 80:20, the stone powder is blended into the inner or outer soil.

Stone powder, blast furnace slag, fly ash, alkaline mineral material, sodium silicate

Description

Method for manufacturing concrete composition for strength at room temperature containing stone powder {CONCRETE COMPOSITION MAKING METHOD WITH MILLING STONE}

The present invention relates to a method for producing a room temperature strength concrete composition comprising stone powder, and more particularly, sodium based alkaline inorganic materials and sodium silicates, which are appropriately used for cement powder, blast furnace slag, fly ash and alkali activator without any cement. By applying a non-baking binder composed of, relates to a method for producing a concrete composition in which strength is expressed even at room temperature.

Cement is the most important and widely used structural material used in the modernization of the industry. Cement is the basic material for the construction of various SOCs such as roads, bridges, tunnels, ports, houses and buildings.

Especially in the 20th century, construction technology has been advanced according to the advancement of the industrial structure, and accordingly, ordinary Portland cement, which has been in full production since the beginning of the 20th century, has greatly increased its production, producing about 1.5 billion tons. Technology has also evolved dramatically.

In addition, construction projects such as high-rise buildings, deep underground structures, huge bridges, marine airports, and underwater cities are planned to expand SOC for the information age and creation-oriented era, which are accompanied by the advancement of industrial structure and diversification of social structure. Cement demand is expected to increase steadily.

As such, although cement has played an important role in the construction of SOC, the tendency is recently recognized as a negative material for the natural and global environment.

In particular, cement is not only used limestone, but also is produced at high temperature (approximately 1,500 ℃) during the clinker manufacturing process, producing 1 ton of cement in this process. It is serious enough to account for 7-8% of the population.

In Korea, cement production is about 63 million tons per year, releasing about 56.7 million tons of carbon dioxide, the second largest after the steel industry.

Meanwhile, since the climate change agreement for the prevention of global warming was adopted in Rio in Brazil in 1992, global warming has been recognized as a common human problem, and countries around the world have prepared a response.

In particular, since the Kyoto Protocol on the Climate Change Convention was adopted in Kyoto in 1997, developed countries in 38 countries have to comply with the obligation to reduce greenhouse gases as the Kyoto Protocol came into effect in 2005.

According to the Kyoto Protocol, there is a difficult task to reduce the average 5.2% of emissions in 1990 during the first commitment period (2008-2012).

At the G8 Summit held in Toyako, Japan in July 2008, leaders from each country are considering reducing their emissions to 50% by 2050.

Such strong GHG reduction efforts are not an exception in Korea, and strong measures are needed at the government level as it is certain that they will be included in the countries subject to the second mandate to reduce GHG emissions from 2013.

As of 2004, Korea emits 461 million tons of carbon dioxide and ranks 10th in the world. In particular, the rate of increase of carbon dioxide emissions is the second highest in the world after China.

On the other hand, fly ash generated from thermal power plants and blast furnace slag, which are by-products of steel mills, are used as cement materials and mixed materials for concrete, but about 50% of them are being treated by land and land reclamation. In addition, many environmental problems are caused by the leaching of coal ash composed of leachate and fine powder generated during landfill.

In addition, most of the river pebbles and river sands collected from the rivers since the 1990s are depleted, and most of the crushed aggregates produced in Seoksan are currently used. Most of the stone powder generated during the stone production process is also landfilled without being recycled except for the use of on-site stony recovery.

The stone dust can be classified as 'inorganic sludge' among the wastes to be recycled under the Waste Management Act, and in accordance with the recycling regulations, more than 50% of the soils recycled from general soil or construction wastes are recycled. It is necessary to improve the proper treatment method considering the engineering characteristics of the.

Accordingly, the present invention is to propose the present invention by repeating the research and experiment to use the blast furnace slag, fly ash, stone powder as a binder of the concrete, the present invention is 100% replaceable without using cement which is the basic binder of concrete It is an object of the present invention to provide a concrete composition Q method using a binder that does not require a calcination process by mixing blast furnace slag, fly ash and stone powder.

The present invention for achieving the above object is to provide a cemented non-source source binder.

The binder includes 5 to 20% by weight of stone powder, 30 to 50% by weight of blast furnace slag, and 30 to 50% by weight of fly ash, including a binder and an alkali activator, wherein the weight ratio of the binder and the alkali activator is 60:40 to Manufactured in a ratio of 80:20,

Binder comprising 40 to 60% by weight of blast furnace slag and 40 to 60% by weight of fly ash; And an alkali activator, wherein the weight ratio of the binder and the alkali activator is 60:40 to 80:20, and 10 to 30 parts by weight of stone powder is added based on 100 parts by weight of the binder.

In this case, the alkali activator includes a sodium alkaline solution and sodium silicate, the weight ratio of the sodium alkaline solution and sodium silicate is 80:20 ~ 20:80.

The sodium alkaline solution is a sodium hydroxide (NaOH) solution, the molar concentration of the sodium hydroxide solution is characterized in that 6 ~ 12M.

The sodium silicate includes silicon dioxide (SiO ₂ ) and sodium oxide (Na ₂ O), and the molar ratio of silicon dioxide and sodium oxide is 1.0 to 3.0.

In addition, the powder of the stone powder is characterized in that 1,500 ~ 4,000cm ² / g.

Concrete composition according to the present invention

Mixing fine aggregate, coarse aggregate and water;

A second step of preparing a binder by mixing 5 to 20% by weight of stone powder, 30 to 50% by weight of blast furnace slag and 30 to 50% by weight of fly ash;

A third step of mixing an alkali activator to the binder such that a weight ratio of the binder and the alkali activator is 60:40 to 80:20; And

And a fourth step of mixing the binder prepared by mixing the alkali activator with the mixture prepared in the first step.

The alkali activator includes a sodium-based alkaline solution and sodium silicate having a weight ratio of 80:20 to 20:80,

A first step of preparing a mixture by mixing fine aggregate, coarse aggregate and water;

A second step of preparing a binder by mixing 40 to 60 wt% of blast furnace slag and 40 to 60 wt% of fly ash;

A third step of mixing by adding 10 to 30 parts by weight of stone powder based on 100 parts by weight of the binder;

A fourth step of mixing the alkali activator to the binder such that the weight ratio of the binder and the alkali activator prepared in the second step is 60:40 to 80:20; And

Mixing the mixture prepared in the first step and the binder in which the alkali activator prepared in the fourth step is mixed;

The alkali activator includes a sodium-based alkaline solution having a weight ratio of 80:20 to 20:80 and sodium silicate.

In such a concrete composition, the powder level of stone powder is 1,500-4,000 cm ² / g,

Provided is a room temperature strength concrete composition comprising a stone powder prepared by such a method.

As described above, the concrete composition using the non-baking binder including the stone flour, fly ash, blast furnace slag, and the concrete composition using the non-baking binder including the fly ash, blast furnace slag and replacing a part of the fine aggregate with the stone powder are suitable. By mixing stone powder, fly ash, blast furnace slag, alkali activator, sodium silicate at a ratio, and adding water and binder at an appropriate ratio, the compressive strength can be secured in the range of 20 to 50 MPa.

In addition, the present invention can adjust the target fluidity according to the mixing amount of the binder or fine aggregate component, there is an advantage that can adjust the compressive strength by adjusting the mixing ratio of the binder.

Hereinafter, the present invention will be described in more detail.

The non-fired binder of the present invention comprises stone flour, fly ash, blast furnace slag, alkali activator, sodium silicate, or comprises fly ash, blast furnace slag, alkali activator, sodium silicate.

When using a binder comprising the stone powder, fly ash, blast furnace slag, alkali activator, sodium silicate, 5 to 20% is used as the water resistant (replacement method) to the total weight of the binder.

In addition, in the case of using a binder comprising the fly ash, blast furnace slag, alkali activator, sodium silicate, 10 to 30 parts by weight is used as a foreign material (method of adding) to the total 100 parts by weight of the binder. This becomes a fine aggregate function.

The fly ash is discharged through the combustion furnace together with the combustion gas as fine-sized particles of coal ash produced during the combustion process, and occupies 80 to 85% of the total coal ash generated, and the recycling method is researched and used at various angles. As it is, the amount is inferior to about 50%.

However, blast furnace slag in steel mills is mostly recycled.

In the case of stone dust, annual output is 15 million tons, most of which is disposed of by landfill (Ministry of Environment-21C Frontier R & D Project, 2005). Stone dust is required to be mixed with more than 50% of the soil collected from recycled general soil or construction wastes, which is a problem of expensive recycling.

The present invention is characterized by having a reaction mechanism to harden by activating the polymerization reaction using sodium hydroxide (NaOH) solution, sodium silicate, which is an alkali activator, using the stone powder, blast furnace slag, and fly ash. The reaction mechanism is described in more detail as follows.

In other words, alkali activation is a chemical reaction between various aluminum-silicate oxides that make Si-O-Al-O composites under a high alkali environment. Although the chemical reactor mechanism for alkali activation is not yet clear, the reaction mechanism derived using alkali hydroxide can be generalized as follows.

Both reaction mechanisms clearly show that the Al and Si components are the basis of alkali activation. These reaction rates are very fast and the reaction mechanism can be constructed as a step of dissolution, transfer and adaptation and polycondensation.

Therefore, in the present invention, the strength is increased by inducing polymerization reaction through the combination composition of blast furnace slag, fly ash, stone powder and alkali activator with sodium hydroxide (NaOH) solution and sodium silicate, so that the cement is not used. It will be able to form a binder or concrete composition that can express a certain strength or more without a sintering process.

A non-plastic binder having such a theoretical background is composed of blast furnace slag (A), fly ash (B), stone powder (C), alkali activator (D) and sodium silicate (E).

The blast furnace slag (A) is used in the case of substituting the stone powder 30 ~ 50% and 40 ~ 60% when the foreign exchange is used,

The fly ash (B) is used in the case of substituting stone powder in 30 ~ 50%, and in the case of substituting substituting 40 ~ 60%,

The stone powder (C) is used in 5 to 20% when the substitutional substitution, and 10 to 30% when the substitution is substituted.

Particularly, in the case of stone powder, since the powder is an unreactive powder, there is a problem that strength expression is significantly lowered when the amount exceeds the above ratio.

In the case of the concrete composition that controls the binder component at such a blending ratio, strength is expressed at room temperature, workability is easily secured, strength is easily controlled by adjusting the mixing ratio of the binder, and curing is possible at room temperature. It is characterized by the point and the like.

And, the weight ratio of blast furnace slag and fly ash and stone powder (A + B + C or A + B) and alkali activator and sodium silicate (D + E) is 60:40 to 80:20 and the alkali activator (D) It is preferable that the weight ratio of sodium silicate (E) is 80: 20-20: 80.

On the other hand, the powder of the powder is preferably 1,500 ~ 4,000cm ² / g, which is when the powder is less than 1,500 cm ² / g is less reactive to the strength, the powder is 4,000cm ² / g In the case of exceeding the reactivity, the reactivity is large, but it is a cause of unit cost increase due to processing problems, and it is difficult to secure the fluidity, so adjustment is necessary for the purpose.

NaOH, which is the alkali activator, is preferably used in the range of 6-12M in consideration of workability and compressive strength.

In addition, the sodium silicate preferably has a molar ratio of SiO ₂ to Na ₂ O in the range of 1.0 to 3.5. If it is less than 1.0, the viscosity of the binder increases rapidly and the slump decreases, thereby decreasing the workability. In addition, the Si component required for the polymerization reaction decreases, the long-term strength is decreased, and when the molar ratio exceeds 3.5, the workability is affected. Although not given, there is a problem that the Na ions become smaller and the initial strength becomes smaller.

The present invention provides a concrete composition comprising the above-described stone powder, blast furnace slag, fly ash, the concrete composition includes stone powder, blast furnace slag, fly ash, fine aggregate, coarse aggregate, and also mixes alkali activator, water and the like. It is manufactured through the method of stirring.

In this case, the water and the binder may be applied within 40% by weight, and more preferably, 20 to 40% by weight, which may be applied in an alkaline inorganic material in an aqueous solution, that is, sodium hydroxide and sodium silicate, when water is not used at all. Fluidity can be secured by chemically bound water, and thus, the strength and fluidity can be easily adjusted by adjusting the amount or molar concentration of the alkali activator. In addition, the mixing of the stone powder increases the viscosity and improves the effective performance in preventing the quenching with non-reactive powder. When the amount exceeds 40%, a sharp decrease in strength appears.

Specifically,

In the case of mixing the stone powder in a refractory manner,

Mixing fine aggregate, coarse aggregate and water;

A second step of preparing a binder by mixing 5 to 20% by weight of stone powder, 30 to 50% by weight of blast furnace slag and 30 to 50% by weight of fly ash;

A third step of mixing an alkali activator to the binder such that a weight ratio of the binder and the alkali activator is 60:40 to 80:20; And

And a fourth step of mixing the binder prepared by mixing the alkali activator with the mixture prepared in the first step.

The alkali activator is to prepare a concrete composition to include a sodium-based alkaline solution having a weight ratio of 80:20 ~ 20:80 and sodium silicate (sodium silicate),

For example, when mixing stone gates in a foreign manner,

A first step of preparing a mixture by mixing fine aggregate, coarse aggregate and water;

A second step of preparing a binder by mixing 40 to 60 wt% of blast furnace slag and 40 to 60 wt% of fly ash;

A third step of adding and mixing 10 to 30 parts by weight of stone powder based on 100 parts by weight of the binder;

A fourth step of mixing the alkali activator to the binder such that the weight ratio of the binder and the alkali activator prepared in the second step is 60:40 to 80:20; And

Mixing the mixture prepared in the first step and the binder in which the alkali activator prepared in the fourth step is mixed;

The alkali activator is to include a sodium-based alkaline solution having a weight ratio of 80:20 ~ 20:80 and sodium silicate (sodium silicate).

When the concrete composition is manufactured according to the present invention by such methods, the powder of the stone powder is to be 1,500 ~ 4,000cm ² / g.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Embodiments according to the present invention can be modified in many different forms, the scope of the present invention is not limited to the embodiments described below.

≪ Example 1 >

Influence of powder of stone powder

In order to analyze the effect of the powdered powder in the non-baking binder including the stone powder, fly ash, blast furnace slag and concrete composition using the same, the powder degree 1,500 cm ² / g, 3,000 as shown in Table 1 below. cm ² / g 4,000cm ² / g was used each 20% by weight, blast furnace slag 40% by weight, fly ash was used in a ratio of 40% by weight.

division Powder WSP 1500 1500 WSP 3000 3000 WSP 4000 4000

In each case, the binder was composed of 15% by weight of 9M sodium hydroxide as an alkaline inorganic material and 15% by weight of sodium silicate (molar ratio of SiO ₂ and Na ₂ O 3.2).

And the water and the binder was used 20% by weight ratio, the remaining fine aggregate, coarse aggregate was used in the same ratio as conventional concrete. And as a comparison, ordinary concrete (water-cement ratio 50%, weight percentage) using ordinary cement was prepared.

Slump loss and compressive strength were measured for the manufactured concrete and the results are shown in FIGS. 1 and 2, respectively.

Here, the slump test evaluated the workability immediately after discharging from the mixer by mixing concrete according to KS F 2402, and the compressive strength was made φ100 × 200mm circumferential test body for curing for 1 day at 20 ℃ and then Humidity was performed at 65 ± 5% humidity) and measured according to KS F 2405 at 3, 7, 28, 56 and 91 days of age.

As can be seen in Figure 1, and determined that which of the stone dust fineness higher workability is somewhat degraded, or, the powder is also 1,500cm ² / g is a 210mm slump, fineness 3,000cm ² / g is a 192mm slump, powder In the case of Figure 4,000cm ² / g, the slump was found to significantly reduce the fluidity to about 171mm. However, when the powder is 3,000cm ² / g, it is possible to secure the workability up to 60 minutes after blending, but when the powder is 4,000cm ² / g, it is found that the construction is barely achieved.

From the results of FIG. 2, the greater the powderiness of the stone powder, the higher the strength expression. In the case of the powder degree of 1,500 cm ² / g, the strength was slightly lower than 20 MPa at the age of 28 days and less than 22 MPa at the age of 91 days. However fineness 3,000cm ² / g A comparison of the case than Fineness 3,000cm ² / g if the age at 28 days 32MPa, fineness 4,000cm ² / g of powder when 37MPa also large, the strength enhancement effect in accordance with increases in Appeared.

In conclusion, when the concrete composition is prepared using a binder composed of stone powder, fly ash, blast furnace slag, alkali mineral material (sodium hydroxide) and sodium silicate, the powder powder satisfies 1,500 to 4,000 cm ² / g. It is preferable to use a degree, and in particular, in the case of using a powder degree that satisfies 3,000 cm ² / g or more appeared to be able to secure a compressive strength in the range of 25 ~ 35MPa compressive strength at 28 days of age.

In order to satisfy the workability and advantageous in terms of strength and fine powder, the powder may be most preferably 3,000 cm ² / g in consideration of a grinding process or a classification process.

<Example 2>

Alkali activator effect (moles of sodium hydroxide (NaOH) solution)

In order to analyze the effect of the number of moles of sodium hydroxide (NaOH) solution in the concrete production using the method presented in the present invention, NaOH 6, 9, 12M was prepared using 15% of the total weight of the binder. The binder was 20:40:40 in powder content: fly ash: blast furnace slag in weight ratio, and the ratio of NaOH solution and sodium silicate was tested at 1: 1. And stone powder was also used as a binder 3,000cm ² / g powder. The ratio of water and binder was 40% by weight, and the remaining coarse aggregate and fine aggregate were used like conventional concrete.

According to KS F 2402 thus prepared, a slump test and a φ100 × 200 mm column test specimen were made and cured at 20 ° C. for 1 day, and then 3 days, 7 days, 28 days, and 91 years in air condition (humidity 65 ± 5%). The compressive strength was measured according to KS F 2405 at work. The results are summarized in FIGS. 3 and 4.

As can be seen in Figure 3, the increase in the number of moles of NaOH increased the viscosity of the concrete and increased the reactivity with the blast furnace slag resulted in a decrease in slump, resulting in poor workability. When the maximum 12M was mixed, the fluidity of about 40mm was lowered compared to 6M, and the fluidity duration also decreased about 2 times faster than that of 6M.

From the results of FIG. 4, it was found that the compressive strength increased as the number of moles of NaOH increased. As the number of moles increased, the initial strength of the blast furnace slag increased with the initial reaction rate. However, as the age increased, 9M and 12M showed differences in compressive strength within 5%. Therefore, if the number of moles is more than 12M, it can be used when the initial high strength is required, and if it is necessary to secure the liquidity, it is determined that the production can be made according to the required performance by adjusting the number of moles.

In summary, when the concrete is manufactured using a binder composed of stone powder, blast furnace slag, fly ash, sodium hydroxide and sodium silicate, the SiO _{2 /} Na ₂ O molar ratio of the alkali activator satisfies the range of about 1. When sodium silicate is used, it is known that cementless concrete can be produced with excellent workability and compressive strength. As a result of the analysis through the present embodiment, the molar ratio of SiO _{2 /} Na ₂ O is preferably 6M = 1.364, 9M = 1.071, 12M = 0.88, and a range of 6-12M is used.

<Example 3>

Effect of Substitution Method of Binder Material

In the preparation of concrete with a binder present in the present invention, the effect of the weight ratio of stone powder, blast furnace slag, fly ash, alkali inorganic material (sodium hydroxide), sodium silicate, first, the effect of the mixing ratio of stone powder to the total weight of the binder in order to analyze the effect of mixing and naehal oehal, blast furnace slag powder, a binder also 4,000cm ² / g, fly ash powder also 4,329cm ² / g, stone dust fineness 50:50 for oehal to the 3,000cm ² / g weight ratio A binder composed of: 0, 50: 50: 5, 50:50:10 and 50:50:15 was used, respectively. In the case of blast furnace slag powder naehal FIG 4,000cm ² / g, fly ash powder also 4,329cm ² / g, stone dust fineness 3,000cm ² / g to 50: 50: 0, 45: 45: 5, 40:40:10, 35:35:15, was used in combination. And the alkali activator was used 9M NaOH and sodium silicate 18.75% in the weight of the binder, respectively, and the mixing ratio was added at 1: 1. Water was used 20% by weight of the binder in order to ensure the fluidity. Coarse aggregates, fine aggregates, etc. were used in the same way as ordinary concrete, and in the case of foreign soil, the content of fine aggregates was reduced by stone powder.

In accordance with KS F 2402 thus prepared, a slump test and a φ100 × 200mm columnar specimen were prepared, and cured at 20 ° C. for 1 day, followed by curing at room temperature (humidity 65 ± 5%). Compressive strength was measured according to 2405. The results are summarized in FIGS. 5, 6, 7, and 8.

As can be seen in Figure 5, when mixing the stone powder to the outer shell showed a result that the fluidity is reduced and the compressive strength is increased. The reason for this is that when mixed with foreign soil, the fine aggregates are mixed to replace the fine aggregates, so the fluidity decreases under the influence of finer powder powder than the fine aggregates, and the compressive strength is increased as a filler as the fine powders are mixed.

In FIG. 6, in contrast to FIG. 5, when the binder is replaced with a sediment, the fluidity is relatively increased and the compressive strength is decreased. The reason for this is that blast furnace slag and ply, which are considered to be non-reactive powders, have increased fluidity and are considered to be non-reactive powders as the powder of 3,000 cm ² / g is mixed with the basic binder of more than 4,000 cm ² / g. This is because it is mixed by replacing ash. In other words, Si, Al, and Na in an appropriate ratio required for the polymerization reaction are present, but the mixing of the stone powder causes the Al component to decrease and the strength to decrease, while the SiO ₂ component of the stone powder is stabilized to decrease the strength.

From the above results, the composition ratio of stone powder and blast furnace slag fly ash is more than 10% of fine aggregates in the case of foreign soil, and less than 10% of binder in case of inhalation. Therefore, in the case of stone powder, it is difficult to use more than 30% in the case of replacing fine aggregate, and it is found that material separation phenomenon occurs when more than 15% is mixed in the case of cold weather.

FIG. 7 shows the compressive strength when 0, 5, 10 and 15% of stone powder is mixed with foreign soil. As a result of the experiment, the compressive strength tended to increase as the amount of stone powder increased, but it showed higher compressive strength than the standard formulation. A mixture of about% is considered appropriate.

8 shows the compressive strength when 0, 5, 10, 15% of stone powder is mixed with a hahal. As a result of the experiment, it was found that even if only 5% of the base mixture was mixed, the compressive strength decreased rapidly.In the case of mixing up to 15%, the compressive strength decreased by about 50% compared to the standard mixture. It is thought to be available until now.

Therefore, it was found that it is possible to manufacture concrete with 20 ~ 75MPa grade depending on the mixing method and amount of stone powder.

Figure 1 is a graph showing the slump loss results according to the powder of stone powder.

2 is a graph showing the results of compressive strength for each age according to the powder of stone powder.

3 is a graph showing the fluidity loss according to the molar concentration of NaOH.

4 is a graph showing the compressive strength results according to the molar concentration of NaOH.

5 is a graph showing the fluidity loss results according to the external replacement of stone powder.

6 is a graph showing the fluidity loss results according to the sedimentation substitution of stone powder.

7 is a graph showing the results of compressive strength according to external replacement of stone powder.

8 is a graph showing the results of compressive strength according to the stone load replacement of stone powder.

Claims (12)

delete delete delete delete delete delete delete delete Mixing fine aggregate, coarse aggregate and water; A second step of preparing a binder by mixing 5 to 20% by weight of stone powder, 30 to 50% by weight of blast furnace slag and 30 to 50% by weight of fly ash; A third step of mixing an alkali activator to the binder such that a weight ratio of the binder and the alkali activator is 60:40 to 80:20; And And a fourth step of mixing the binder prepared by mixing the alkali activator with the mixture prepared in the first step. The alkali activator is a method for producing a room temperature strength concrete composition containing a stone powder characterized in that it comprises a sodium-based alkaline solution having a weight ratio of 80:20 ~ 20:80 and sodium silicate (sodium silicate). A first step of preparing a mixture by mixing fine aggregate, coarse aggregate and water; A second step of preparing a binder by mixing 40 to 60 wt% of blast furnace slag and 40 to 60 wt% of fly ash; A third step of adding and mixing 10 to 30 parts by weight of stone powder based on 100 parts by weight of the binder; A fourth step of mixing the alkali activator to the binder such that the weight ratio of the binder and the alkali activator prepared in the second step is 60:40 to 80:20; And Mixing the mixture prepared in the first step and the binder in which the alkali activator prepared in the fourth step is mixed; The alkali activator is a method for producing a room temperature strength concrete composition containing a stone powder characterized in that it comprises a sodium-based alkaline solution having a weight ratio of 80:20 ~ 20:80 and sodium silicate (sodium silicate). The method according to claim 9 or 10, The powder degree of the stone powder is 1,500 ~ 4,000cm ² / g Room temperature strength concrete composition manufacturing method comprising the stone powder, characterized in that. delete

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