KR101725283B1 - Composition for concrete comprising siliceous dust and composition method using the same thing - Google Patents

Abstract

The invention water 140 ~ 190kg / m ^3; 210 to 400 kg / m ^{3 of} cement; Fine Aggregate 681 ~ 962kg / m ^3; A mixture of silica-based dust and silica fume, which is a by-product generated in the dust collecting process of ferrosilicon, by introducing the concrete composition, which further comprises a coarse aggregate of 832 to 1270 kg / m ³ ; , It is possible to effectively reduce the ignition loss of the low-grade silica-based dust by recycling the industrial by-products, thereby ensuring environment-friendly, economical, high performance, easy to apply and excellent applicability.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete composition comprising a silica-based dust mixture and a method for producing the concrete using the same. BACKGROUND ART < RTI ID = 0.0 >

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a civil engineering and construction technology field, and more particularly, to a concrete composition and a method of manufacturing concrete using the same.

In recent years, the production of mixed concrete using industrial byproducts such as thermal power plants and steel mills has produced a lot of researches, and the utilization of the concrete has been gradually increasing both within and outside the country.

In other words, development of various cement substitutes has become a source technology that leads to cost reduction of existing OPC (ordinary Portland Cement) or high performance (high durability, high strength, high flowability) concrete, In addition, the development of high performance admixture and optimum replacement rate for accelerating the early strength of cement substitute has attracted the attention of related workers.

Here, blast furnace slag fine powder, fly ash and silica fume, which have been regarded as industrial wastes in recent years, have recently been recognized as an admixture.

In the case of blast furnace slag and fly ash, supply and demand for domestic products are compromised organically. In the case of silica fume, due to lack of related factories and mass production facilities, This is a disadvantage that it is very expensive.

In recent years (2013.5), a ferrosilicon electric furnace plant, which is the main constituent of silica fume, has been established in Korea, and it has been possible to find a way to supply localization related to this. In October 2014, Raw materials are sold for 93% purity of SiO2.

However, there has been no research into the concrete field of low-grade silica fume until now, and this provides a basis for the first trial and full-scale research on the Cyclon dust as the first processing material in the by-product treatment stage.

That is, the performance of the low-grade silica fume as the high-quality silica fume is limited to the similar performance range, and if the low-grade silica fume that is currently useless only as the landfill waste is applied by applying the optimum blending ratio in the construction and concrete fields, Secondary effects such as substitution effect versus imported acid and optimal cross-sectional effect are expected.

In the case of Korean Patent Laid-Open Publication No. 10-2012-0034287, it can be said that the present invention and related prior art patents are related to the present invention using the binder containing cement and silica fume, (ZrO2), and the specific surface area is limited to 5000 m 2 / g, since silica fume is not originally used in the sense that it is a performance test using foreign silica fume. There is a difference from the invention. On the other hand, according to Korean Registered No. 10-1385237, "Method of Manufacturing Nanoscale Calcium Silicate Hydrate Using Silica Fume ", the silica fume was proposed as an admixture rather than a low-quality admixture to be presented in the present invention Is an invention of a different purpose originally. As an additional example, US Patent Application 04931098, "Method for adding silica fume to dry shotcrete mixture", has attempted to apply silica fume as a mixed concrete material such as tunnel shotcrete and lining, .

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to effectively reduce the ignition loss of the low-grade silica-based dust through the mixing of silica-based dust and silica fume, which are byproducts generated in the ferrosilicon dust collecting process, It is an object of the present invention to provide a concrete composition that can be environmentally friendly, economical, and high in performance by recycling by-products, easy to install, and applicable, and a method of manufacturing concrete using the same.

In order to solve the above problems, the present invention is water, 140 ~ 190kg / m ^3; 210 to 400 kg / m ^{3 of} cement; Fine Aggregate 681 ~ 962kg / m ^3; And a coarse aggregate of 832 to 1270 kg / m ³ ; and a silica-based dust mixture.

The silica-based dust mixture is formed by mixing silica fume and silica-based dust, and is preferably mixed with 5 to 12% by weight based on the weight of the cement.

The weight ratio of the silica fume and the silica dust is preferably 45 to 55: 55 to 45.

The silica-based dust mixture is formed by mixing the slag fine powder and the silica-based dust, and 0.1 to 60% by weight based on the weight of the cement is preferably mixed.

The silica-based dust mixture is formed by mixing fly ash and silica-based dust, and 0.1 to 30% by weight based on the weight of the cement is preferably mixed.

The silica-based dust mixture is formed by mixing meta kaolin and silica-based dust, and is preferably mixed with 5 to 13% by weight based on the weight of the cement.

The cement has a specific gravity of 3.0 to 3.25.

The fine aggregate preferably has a unit weight of 2.1 to 2.7 g / cm ³ and an assembly ratio of 2.3 to 3.2.

The coarse aggregate preferably has a unit weight of 2.1 to 2.9 g / cm ³ and a particle size of 25 mm or less.

The present invention relates to a method for producing concrete using the concrete composition, which comprises mixing silica-based dust, which is an initial dust-collecting material generated in the dust collection process of ferrosilicon, and silica fume as a final dust-collecting material to form the silica- ; And mixing the silica-based dust with the water, cement, fine aggregate, and coarse aggregate to produce the concrete composition.

The present invention effectively reduces the ignition loss of the low-grade silica-based dust by mixing silica-based dust and silica fume, which are byproducts generated in the ferrosilicon dust collecting process, and recycles the industrial byproducts, thereby achieving an environmentally friendly, economical, A concrete composition which is easy to construct and has excellent applicability, and a method of producing concrete using the same.

1 is an experimental example for verifying the performance of the concrete composition according to the present invention,
1 to 4 are images showing a pretreatment process for measuring the ignition loss of a concrete composition.
FIG. 5 and FIG. 6 are images showing the test results of the Ignition loss test of an internationally recognized testing laboratory.
Fig. 7 is an image showing a material metering state of silica-based dust and silica fume. Fig.
Fig. 8 is an image showing the casting of a paste and a concrete test piece to which the ignition loss reduction improvement method is applied.
9 is an image showing the mixing ratio of silica-based dust and silica fume.
10 is a graph showing the compressive strength measurement results of the concrete composition.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the accompanying drawings.

The concrete composition proposed in the present invention has a water content of 140 to 190 kg / m ³ ; 210 to 400 kg / m ^{3 of} cement; Fine Aggregate 681 ~ 962kg / m ^3; And a coarse aggregate of 832 to 1270 kg / m ³ ; and a silica-based dust mixture.

Here, the silica-based dust mixture refers to a mixed material of silica-based dust, which is an initial dust collecting material, generated in the multiple dust collecting process of ferrosilicon.

More specifically, the present invention relates to a silicon additive for ferrosilicon or aluminum alloy silicon steel sheet used as a deoxidizing agent for iron manufacturing, a silicon additive for silicon alloy for electromagnetic (electromagnetic), an adhesive for cast iron or the like, a metal additive for metal silicon The final by-product is obtained through the multiple dust collecting apparatuses such as the primary dust collecting apparatus and the secondary dust collecting apparatus.

At this time, silica-based dust is generated as an initial dust-collecting material, and the final dust-collecting material is silica fume.

In the case of silica-based dust, which is an early dust collector, it is a low-grade resource, and is a resource that can not be buried because it does not satisfy the required standards due to the problem of ignition loss.

However, in order to solve the above problems, the present invention proposes a method of reducing the required amount of ignition loss and recycling by suggesting a mixture of silica fume, which is a conventional dust collector, and silica dust, which is an initial dust collector, .

Therefore, the advantages obtained through the concrete mixture of the present invention are as follows.

First, it effectively reduces the ignition loss of silica-based dust, which is a low-grade industrial by-product, and is economical and eco-friendly.

In addition, since the amount of silica fume to be used can be reduced by mixing a high-priced silica fume with a low-grade silica-based dust, a cost reduction effect is obtained.

Secondly, it has an advantage that the same or higher performance can be secured as compared with ordinary portland cement (OPC) and high-grade silica fume (SiO ₂ content: 93% or more) which is conventionally used conventionally.

Third, by showing the blending ratio of silica-based dust, fine slag powder, fly ash, and meta-kaolin as well as silica fume, industrial by-products that have been conventionally treated as waste can be effectively recycled.

Fourth, since it is possible to manufacture using only an optimized mixing ratio without requiring a complicated process, it is easy to construct and has excellent merits.

That is, it is suitable not only for general buildings but also for various social infrastructures (roads, bridges, dams, breakwaters, berths, submarine tunnels, vehicle bases, etc.) and various power plant structures.

More specifically, the compounding ratio of the concrete composition of the present invention will be described in detail as follows.

First, the silica-based dust mixture can be formed by mixing silica fume and low-grade silica-based dust.

As described above, the low-grade silica-based dust can be recycled as a concrete material without being buried through such a combination, and the content of ignition loss can be reduced.

For this purpose, the silica-based dust mixture is preferably mixed with 5 to 12% by weight based on the weight of the cement.

Table 1 shows the compounding ratio of the above mixture of silica-based dust and silica-fume mixed.

At this time, the weight ratio of silica fume and silica dust is 45 to 55: 55 to 45.

In addition, the silica-based dust mixture may be formed by mixing a slag powder and a silica-based dust, which are steel by-products similar to silica-based dusts and are admixtures for concrete.

In this case, the mixture is preferably mixed with 0.1 to 60% by weight based on the weight of the cement.

Table 2 shows the blending ratio of the blended mixture of the above silica-based dust and the slag fine powder.

In addition, the silica-based dust mixture may be formed by mixing fly ash and silica-based dust, which are industrial by-products produced in a coal-fired power plant, wherein the mixture is mixed with 0.1-30 wt% Do.

Table 3 shows the blending ratio of the blended mixture of silica-based dust and fly ash.

In addition, the silica-based dust mixture may be formed by mixing metakaolin and silica-based dust, wherein the mixture is preferably mixed with 5 to 13% by weight based on the weight of the cement.

Table 4 shows the compounding ratio of the blended mixture of silica-based dust and meta-kaolin.

Meanwhile, it is preferable that the specific gravity of the cement mixed with the concrete composition of the present invention is 3.0 to 3.25.

The fine aggregate preferably has a unit weight of 2.1 to 2.7 g / cm ³ and an assembly ratio of 2.3 to 3.2.

The coarse aggregate preferably has a unit weight of 2.1 to 2.9 g / cm ³ and a maximum particle size of 25 mm or less.

A method for producing concrete using the concrete composition of the present invention is as follows.

First, silica-based dust, which is an initial dust collecting material generated in the dust collecting process of ferrosilicon, and silica fume as a final dust collecting material are mixed to form a silica-based dust mixture with reduced ignition loss.

Next, the silica-based dust, the water, the cement, the fine aggregate and the coarse aggregate are mixed to prepare the concrete composition.

Hereinafter, experimental examples for explaining the effects of the present invention will be described.

1 to 4 are images showing a state in which silica fume and silica dust are collected and pretreated for measurement of ignition loss and then heated by electric heating.

In order to demonstrate the effect of reducing the ignition loss of the concrete mixture according to the present invention, the test results commissioned by an internationally recognized testing laboratory are shown in FIGS.

As shown in the test results of FIGS. 5 and 6, it can be seen that the concrete mixture of the present invention has a suitable amount of use as a material of concrete by reducing the amount of thermal loss of silica-based dust by about 40%.

Table 5 shows the mixing ratio suitable for the specific formulation using the low-grade silica fume of the present invention.

Fig. 7 is an image showing a material metering state of silica-based dust and silica fume.

FIG. 8 is an image showing the placement of a mock-up specimen incorporating low-grade silica fume, and FIG. 9 is an image comparing the difference in surface appearance between low-grade silica fume and high-quality silica fume.

10 is a graph showing the results of measurement of compressive strength values at 28 days of age in order to confirm mechanical properties such as compressive strength of the concrete composition of the present invention.

As a result of the measurement, it can be confirmed that the compressive strength of the concrete composition according to the present invention is equal to or superior to the compressive strength of concrete which is conventionally used.

Further, it can be confirmed that the concrete composition obtained by mixing the silica product with the silica-based dust has a higher compressive strength than the concrete composition containing only the silica fume.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

Claims (10)

Water 140 to 190 kg / m ³ ;
210 to 400 kg / m ^{3 of} cement;
Fine Aggregate 681 ~ 962kg / m ^3;
Coarse aggregate 832 ~ 1270kg / m ³ ;
≪ / RTI &
Based dust mixture of 55 to 45: 45 to 55 by weight of silica-based dust and silica fume, which are early dust collectors, produced in the multiple dust collecting process of closed silicone is mixed with 5 to 12 parts by weight of the cement By weight.
delete delete Water 140 to 190 kg / m ³ ;
210 to 400 kg / m ^{3 of} cement;
Fine Aggregate 681 ~ 962kg / m ^3;
Coarse aggregate 832 ~ 1270kg / m ³ ;
≪ / RTI &
Wherein the silica-based dust mixture containing the silica dust and the fine powder of the slag, which is the initial dust collecting material, generated in the multiple dust collecting process of the closed silicone is mixed with 0.1 to 60 parts by weight of the cement.
Water 140 to 190 kg / m ³ ;
210 to 400 kg / m ^{3 of} cement;
Fine Aggregate 681 ~ 962kg / m ^3;
Coarse aggregate 832 ~ 1270kg / m ³ ;
≪ / RTI &
Wherein a silica-based dust mixture containing silica-based dust and fly ash, which are early dust collecting materials generated in the multiple dust collecting process of closed silicone, is mixed with 0.1 to 30 parts by weight based on the weight of the cement.
Water 140 to 190 kg / m ³ ;
210 to 400 kg / m ^{3 of} cement;
Fine Aggregate 681 ~ 962kg / m ^3;
Coarse aggregate 832 ~ 1270kg / m ³ ;
≪ / RTI &
Wherein a silica-based dust mixture containing silica-based dust and meta-kaolin, which are early dust collecting materials generated in the multiple dust collecting process of closed silicone, is mixed with 5 to 13 parts by weight based on the weight of the cement.
A method of producing concrete using the concrete composition of any one of claims 1 to 6,
Forming a silica-based dust mixture in which silica-based dust, which is an initial dust generated in a dust collection process of ferrosilicon, is mixed to reduce ignition loss;
Mixing the silica-based dust and the water, cement, fine aggregate and coarse aggregate to prepare the concrete composition;
The method for producing a concrete according to claim 1,
8. The method of claim 7,
The cement
And a specific gravity of 3.0 to 3.25.
8. The method of claim 7,
The fine aggregate
A unit weight of 2.1 to 2.7 g / cm < ³ &
And an assembly ratio of 2.3 to 3.2.
8. The method of claim 7,
The coarse aggregate
A unit weight of 2.1 to 2.9 g / cm ³ ,
And the particle size is 25 mm or less.

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