KR101779565B1 - Eco-friendly cement concrete composition for ready-mixed concrete - Google Patents

Abstract

The present invention relates to an eco-friendly cement concrete composition for ready-mix concrete. The eco-friendly cement concrete composition includes: 5 to 45 wt% of a binder; 15 to 75 wt% fine aggregate; 10 to 65 wt% of coarse aggregate, and 1 to 20 wt% of water. The binder conventionally includes: 26 to 80 wt% of Portland cement; 5 to 40 wt% of blast furnace slag fine powder; 1 to 20 wt% of volcanic ash; 0.1 to 20 wt% of desulfurized gypsum; 0.01 to 20 wt% of calcium aluminate; 0.01 to 10 wt% of styrene-butyl acrylate; 0.01 to 5 wt% of a water reducing agent; 0.01 to 5 wt% of a thickener; and 0.01 to 5 wt% of an antifoaming agent. The present invention uses and recycles industrial byproducts to enhance workability, long-term strength development, and durability. The present invention uses the silica-based admixture having potential hydraulic and pozzolanic reaction characteristics to improve the durability including long-term strength, chloride penetration resistance, freeze-thaw resistance, alkali-aggregate reaction suppressing performance, thereby extending the service life of a concrete structure. The present invention also uses the sericite and bottom ash with excellent far-infrared ray emission, deodorization, and heat insulation properties to improve the durability and functionality of the cement composition compared to a conventional cement composition.

Description

TECHNICAL FIELD [0001] The present invention relates to an eco-friendly cement concrete composition for a concrete mixer,

The present invention relates to a cement concrete composition for a concrete mixer, and more particularly, to a cement concrete composition for a concrete mixer which can improve strength and durability and is particularly useful for recycling industrial byproducts. To an environmentally friendly cement concrete composition for a ready-mixed concrete.

Generally, Ready Mixed Concrete is manufactured by using cement, aggregate (sand and gravel), water, and mixed material in a factory equipped with concrete manufacturing facilities, and then mixed with a truck mixer or an agitator truck ) Is a concrete that is not hardened and is conveyed to the construction site. It is made by mixing cement, water, sand, gravel and admixture.

The conventional concrete used to date is merely a simple material for making concrete structures in a construction site, and there is no function other than the structure after the curing of the casting, and problems related to the environment are continuously raised due to self-toxicity . Generally used concrete is a strong alkali with a pH of 12.5 ~ 13. It is a harmful element that can cause fatal harm to the indoor environment such as carbon dioxide (CO ₂ ), ammonia basic gas and radon (Rn) And these harmful factors cause sick house syndrome. Particularly, the carbon dioxide and the base generated during the curing of the concrete as described above are the main cause of corrosion of the reinforced steel rod and the like, and the structure is weakened due to the expansion crack due to the corrosion of the steel rod, and the life of the building is shortened.

On the other hand, organic compounds causing sick house syndrome have been studied to have a serious effect on health, such as bronchial system, skin diseases such as atopy, headache, fatigue and emotional instability. Therefore, in order to solve these problems, examples of coating a newly constructed apartment or a building with a photocatalyst or using natural materials are gradually increasing. Since May 2004, the "indoor space air quality law" was enacted and promulgated. As a result, the newly built buildings were obliged to complete the inspection on the air quality from the environmental authorities before completion.

Especially, in the case of freshly cemented cement, various chemical substances are spewed out, which not only deteriorates health, but it also corrodes various indoor items (for example, exhibits, metals, etc.). Therefore, it is required to develop a technology to fundamentally deviate from the environmental pollution.

Korean Patent No. 10-1613906 (issued on April 20, 2016) Korean Patent No. 10-1288349 (issued on July 22, 2013) Korean Patent No. 10-0476635 (published on March 17, 2005)

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an industrial by-product and a durable silica- The present invention provides an eco-friendly cement concrete composition for a concrete mixer which is superior in durability and functionality to an existing cement concrete composition using sericite and bottom ash.

The eco-friendly cement concrete composition for a concrete mixer according to the present invention comprises 5 to 45 wt% of a binder, 15 to 75 wt% of a fine aggregate, 10 to 65 wt% of a coarse aggregate and 1 to 20 wt% of water, Of the present invention is characterized in that it comprises the following components: 26 to 80% by weight of Portland cement, 5 to 40% by weight of blast furnace slag, 1 to 20% by weight of volcanic ash, 0.1 to 20% by weight of desulfurized gypsum, 0.01 to 20% by weight of calcium aluminate, 0.01 to 5% by weight of a water reducing agent, 0.01 to 5% by weight of a thickening agent, and 0.01 to 5% by weight of an antifoaming agent.

The binding material may further contain 0.01 to 10% by weight of tridymite.

Also, the binder may further contain 0.01 to 10% by weight of itato or peat.

The binder may further contain 0.01 to 10% by weight of fibrin perite.

The fine aggregate may include 30 to 95 wt% of sericite, 1 to 35 wt% of bottom ash, and 1 to 35 wt% of crushed sand. The coarse aggregate may include 10 to 95% by weight of crushed gravel and 5 to 90% by weight of sericite.

Industrial Applicability According to the present invention, by using industrial byproducts in a binder, it is useful in terms of recycling of industrial by-products, and has an effect of improving workability, long-term strength development, and durability.

Also, the durability such as long-term strength development, chloride penetration resistance, freeze-thaw resistance and alkali-aggregate reaction is improved by using a silica-silica admixture having potential hydraulic and pozzolanic reaction characteristics, thereby extending the durability life of the concrete structure.

In addition, it is possible to obtain durability and functionality improvement effect over existing cement concrete compositions by using sericite and bottom ash, which are excellent in far-infrared ray emission characteristics, deodorization property, and heat insulation property.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it will be understood by those skilled in the art that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various changes and modifications may be made without departing from the scope of the present invention. It is not.

The eco-friendly cement concrete composition for a concrete mixer according to a preferred embodiment of the present invention includes a binder, a fine aggregate, a coarse aggregate and water.

The binder is contained in an amount of 5 to 45% by weight based on the environmentally friendly cement concrete composition for a concrete mixer. The fine aggregate is contained in an amount of 15 to 75% by weight based on the environmentally friendly cement concrete composition for a concrete mixer. And the water is contained in an amount of 10 to 65 wt% based on the concrete composition, and the water is contained in an amount of 1 to 20 wt% based on the environmentally friendly cement concrete composition for the concrete.

Aggregates are classified into fine aggregate and coarse aggregate, and those with a grain size of 5 mm or less are referred to as fine aggregate and those having a grain size larger than 5 mm are classified into coarse aggregate.

The fine aggregate preferably contains 30 to 95 wt% of sericite, 1 to 35 wt% of bottom ash, 1 to 35 wt% of crushed sand, 10 to 95 wt% of crushed gravel and 5 to 90 wt% of sericite .

The binder is usually Portland cement Portland cement 26 to 80 wt.% Blast furnace slag fine powder 5 to 40 wt.%, Volcanic ash 1 to 20 wt.%, Desulfurized gypsum 0.1 to 20 wt.%, Calcium aluminate 0.01 to 20 wt. 0.01 to 5% by weight of a water reducing agent, 0.01 to 5% by weight of a thickening agent, and 0.01 to 5% by weight of an antifoaming agent.

The binder is preferably contained in an amount of 5 to 45% by weight based on the eco-friendly cement concrete composition for remicon.

If the content of the binder exceeds 45 wt% with respect to the environmentally friendly cement concrete composition for concrete, the workability, strength and durability are improved, but drying shrinkage and economical efficiency may be deteriorated, If the amount is less than 5% by weight based on the eco-friendly cement concrete composition, the drying shrinkage is small, but the strength and durability may be lowered.

Next, the structure of the binder will be described in detail.

The ordinary Portland cement can usually be Portland cement. Usually Portland cement is preferably used as specified in KS.

The blast furnace slag powder has latent hydraulic characteristics and is used for strength development and durability enhancement. The blast furnace slag fine powder is preferably contained in an amount of 5 to 40% by weight based on the binder. If the content of the fine blast furnace slag powder is less than 5% by weight, the initial reactivity of the composition may be lowered and the initial strength development and durability improving effect may be deteriorated. When the content of the blast furnace slag fine powder exceeds 40% Durability is improved but strength and drying shrinkage may be increased.

The above volcanic ash has pozzolanic properties and is used for long-term strength development and durability enhancement. When the weight ratio of the volcanic material is increased, the initial strength is lowered, but the long-term strength development and durability are increased. Instead of the above-mentioned ash, fly ash, silica powder and silica fume may be used. The above volcanic ash is preferably contained in an amount of 1 to 20% by weight based on the binder. If the content of the volcanic material is less than 1% by weight, the effect of improving the long-term strength and improving the durability of the composition may be deteriorated. If the content of the volcanic material exceeds 20% by weight, the durability of the composition is improved, .

The desulfurization gypsum refers to a gypsum material (phosphoric acid gypsum) that is produced and precipitated as a by-product when phosphoric acid as a raw material of phosphoric acid fertilizer is treated with sulfuric acid to produce phosphoric acid, and gypsum material produced as a byproduct in the desulfurization process of the factory. When the desulfurization gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning and the structure of the cement is densified, thereby increasing the penetration resistance to the chloride ion in the early age.

The desulfurization gypsum is preferably contained in an amount of 0.1 to 20% by weight based on the binder. If the content of the desulfurized gypsum is less than 0.1% by weight, the initial formation of ettringite is reduced and the formation of dense structure is difficult. When the content of the desulfurized gypsum exceeds 20% by weight, good physical properties can be obtained due to quick curing properties This is because water resistance can be reduced.

The calcium aluminate is used to obtain the role of an expanding agent in order to reduce initial strength development and drying shrinkage. The calcium aluminate is preferably contained in an amount of 0.01 to 20% by weight based on the binder. If the content of calcium aluminate is less than 0.01% by weight, the effect of initial strength development and drying shrinkage reduction is reduced. If the content of calcium aluminate is more than 20% by weight, good physical properties can be obtained due to quick curing property, It is because.

The styrene-butyl acrylate is used for improving strength and durability. The styrene-butyl acrylate is preferably contained in an amount of 0.01 to 10% by weight based on the weight of the binder. When the content of the tribe-butyl acrylate is less than 0.01% by weight, the effect of improving the strength and durability is deteriorated. When the content is more than 10% by weight, the strength and durability are improved but the price competitiveness is decreased.

The water reducing agent is used to improve the strength and durability by reducing the water-cement ratio of the cement mortar composition. The water reducing agent may be a polycarboxylic acid type, melamine type, aminosulfonic acid type or naphthalene type fluidizing agent. Here, the melamine-based or naphthalene-based water reducing agent is less effective for improving the strength and durability than the polycarboxylic acid-based water reducing agent, and has a disadvantage that the water-cement ratio reduction effect is not large and the mixing property is poor. Therefore, it is preferable that the above water reducing agent contains a polycarboxylic acid based water reducing agent in an amount of 0.01 to 5% by weight based on the binder.

The thickener is used to prevent material separation of the environmentally friendly cement concrete composition for the ready-mixed concrete. The thickening agent may be methylcellulose, starch, gum or the like, but it is preferable to use a mixture of methylcellulose and starch having excellent viscosity increasing effect in a ratio of 1: 0.1 to 0.5. The thickener is preferably contained in an amount of 0.01 to 5% by weight based on the binder.

The antifoaming agent is added in order to reduce an increase in the amount of air due to generation of entrained air of the environmentally friendly cement concrete composition for a concrete mixer. The antifoaming agent may be selected from the group consisting of an alcohol type antifoaming agent, a silicone type antifoaming agent, a fatty acid type antifoaming agent, an oil type antifoaming agent, an ester type antifoaming agent and an oxyalkylene type antifoaming agent. ≪ / RTI > may be used. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil.

As the fatty acid defoaming agent, stearic acid, oleic acid, and the like can be used. As the oil defoaming agent, kerosene, animal and vegetable oil, castor oil and the like can be used. As the ester type defoaming agent, solitol trioleate, glycerol mono As the oxyalkylene antifoaming agents, polyoxyalkylene, acetylene ethers, polyoxyalkylene diazoxide esters, polyoxyalkylene alkylamines, and the like can be used. As the alcohol-based antifoaming agent, Glycol and the like can be used. The antifoaming agent is preferably contained in an amount of 0.01 to 5% by weight based on the binder.

The binder may further contain 0.01 to 10% by weight of tridimite, 0.01 to 10% by weight of itato or peat, and 0.01 to 10% by weight of fibrin glutarate depending on the purpose and purpose.

The above-mentioned tridymite is used as a natural pozzolan material for improving long-term strength and durability. The tridymite is preferably contained in an amount of 0.01 to 10% by weight based on the binder. If the content of the tridymite is less than 0.01% by weight, the effect of improving the long-term strength and durability is insufficient. If the content exceeds 10% by weight, the reactivity increases and the crack may expand.

Because of its unique fiber structure, it has excellent water retention of about 10 times, and is used for long-term strength development and durability enhancement. When the weight ratio of the soil or the peat is increased, the water-cement ratio is increased and the early strength is lowered, but the long-term strength development and durability are increased. It is preferable that the soil or the peat is contained in an amount of 0.01 to 10% by weight based on the binder. If the content of the isotonizing agent or the peat is less than 0.01% by weight, the effect of improving the strength and durability is deteriorated. If the content is more than 10% by weight, the water-cement ratio is increased and the performance improving effect is deteriorated.

The above-mentioned fibrorite is used to improve the light weight and heat insulation of the composition. The content of the fibrin perlite is preferably 0.01 to 10% by weight based on the binder. If the content of the fibrin perlite is less than 0.01 wt%, the effect of improving the lightness and the heat insulating property may be insignificant. If the content of the fibrin peroxide exceeds 10 wt%, the workability and strength are lowered, I can not.

The fine aggregate preferably contains 30 to 95 wt% of sericite, 1 to 35 wt% of bottom ash, and 1 to 35 wt% of crushed sand.

The sericite is a aggregate material with strong adsorption power and far-infrared ray emission. It is used to obtain far-infrared rays from a green cement concrete composition for a concrete mixer to have a bioactive effect and to obtain deodorizing and antibacterial performance. It is preferable that the sericite is contained in an amount of 30 to 95 wt% with respect to the fine aggregate.

The bottom ash is an industrial by-product from a thermal power plant and has latent hydraulic properties to improve long-term strength development and durability. The bottom ash is lightweight and has excellent heat insulation effect and smoothness due to light weight of the composition. The bottom ash is preferably contained in an amount of 1 to 35% by weight based on the fine aggregate.

The crushed sand was obtained by crushing the natural aggregate in rocksite. The crushed sand is preferably contained in an amount of 1 to 35% by weight based on the fine aggregate.

The coarse aggregate preferably contains 10 to 95% by weight of crushed gravel and 5 to 90% by weight of sericite.

The eco-friendly cement concrete composition for a concrete mixer according to a preferred embodiment of the present invention can be produced by the following method.

The binder, fine aggregate and coarse aggregate are mixed at a certain ratio and stirred in a forced mixer or continuous mixer. The binder is mixed in an amount of 5 to 45% by weight with respect to the environmentally friendly cement concrete composition for a concrete mixer. The fine aggregate is mixed with 15 to 75% by weight of the environmentally friendly cement concrete composition for a concrete mixer. It is preferable to mix 10 to 65% by weight with respect to the concrete composition.

The mixture of the binder, the fine aggregate and the coarse aggregate is further mixed with water at a predetermined ratio and stirred for 1 to 10 minutes. The water is preferably mixed in an amount of 1 to 20% by weight based on the environmentally friendly cement concrete composition for ready-mixed concrete.

Hereinafter, embodiments of the eco-friendly cement concrete composition for a ready-mixed concrete according to the present invention will be more specifically shown and the present invention is not limited by the following embodiments.

≪ Example 1 >

20% by weight of binder, 29% by weight of fine aggregate and 43% by weight of coarse aggregate were mixed and stirred in a forced mixer. Then, 8% by weight of water was further mixed and stirred for 2 to 3 minutes to prepare an environmentally friendly cement concrete composition for concrete. At that time, fine aggregates were mixed with 70 wt% of sericite, 20 wt% of bottom ash and 10 wt% of crushed sand. The coarse aggregate used was a mixture of 50 wt% crushed gravel and 50 wt% sericite.

The binder is usually Portland Portland cement 41 wt.%, Blast furnace slag fine powder 15 wt.%, Volcanic ash 15 wt.%, Desulfurized gypsum 5 wt.%, Calcium aluminate 10 wt.%, Tridymite 5 wt. 1% by weight of fibrin peroxide, 1% by weight of styrene-butyl acrylate, 1% by weight of a water reducing agent, 0.5% by weight of a thickener and 0.5% by weight of an antifoaming agent.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The thickener used was a mixture of methylcellulose and a starch system at a ratio of 0.8: 0.2. The defoamer was a silicone defoamer.

≪ Example 2 >

25 wt% of binder, 26 wt% of fine aggregate, and 39 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 10 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare an environmentally friendly cement concrete composition for concrete. At that time, fine aggregates were mixed with 70 wt% of sericite, 20 wt% of bottom ash and 10 wt% of crushed sand. The coarse aggregate used was a mixture of 50 wt% crushed gravel and 50 wt% sericite.

The binder is usually Portland Portland cement 41 wt.%, Blast furnace slag fine powder 15 wt.%, Volcanic ash 15 wt.%, Desulfurized gypsum 5 wt.%, Calcium aluminate 10 wt.%, Tridymite 5 wt. 1% by weight of fibrin peroxide, 1% by weight of styrene-butyl acrylate, 1% by weight of a water reducing agent, 0.5% by weight of a thickener and 0.5% by weight of an antifoaming agent.

A polycarboxylic acid-based water reducing agent was used as the water reducing agent. The thickener used was a mixture of methylcellulose and a starch system at a ratio of 0.8: 0.2. The defoamer was a silicone defoamer.

In order to compare the physical properties of the eco-friendly cement concrete compositions for concrete prepared according to the above-described Examples 1 to 2, the presently widely used ordinary cement concrete compositions are shown as Comparative Examples 1 to 2.

≪ Comparative Example 1 &

20% by weight of binder, 29% by weight of fine aggregate and 43% by weight of coarse aggregate were mixed and stirred in a forced mixer. Then, 8% by weight of water was further mixed and stirred for 2 to 3 minutes to prepare a cement concrete composition. Crushed sand and crushed gravel were used as fine aggregate and coarse aggregate.

≪ Comparative Example 2 &

25 wt% of binder, 26 wt% of fine aggregate, and 39 wt% of coarse aggregate were mixed and stirred in a forced mixer. Then, 10 wt% of water was further mixed and stirred for 2 to 3 minutes to prepare a cement concrete composition. Crushed sand and crushed gravel were used as fine aggregate and coarse aggregate.

Hereinafter, test results for comparing and evaluating the physical properties of the environmentally-friendly cement concrete composition for concrete prepared according to Examples 1 to 2 and the cement concrete compositions prepared according to Comparative Examples 1 to 2 will be described.

≪ Test Example 1 >

Table 1 below shows the compressive strengths of the environmentally-friendly cement concrete composition for ready-mixed concrete prepared according to Examples 1 and 2 and the cement concrete compositions prepared according to Comparative Examples 1 and 2, Table 1 shows the results.

The compressive strength test was carried out based on the criteria of KS F 4009: 2016 (Ready Mixed Concrete). The test specimen was based on 28 days of curing period.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Compressive strength (kgf / ㎠) 450 475 440 460

As shown in Table 1, the compressive strengths of the compositions prepared according to the present invention (Examples 1 and 2) were higher than those of the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2.

≪ Test Example 2 &

The environmentally friendly cement concrete composition for concrete prepared according to Examples 1 and 2 of the present invention and the cement concrete composition prepared according to Comparative Example 1 and Example 2 were tested by KS F 2424 The rate of change in length was measured and the results are shown in Table 2 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Length change rate (%) 0.045 0.05 0.1 0.11

As shown in Table 2, the eco-friendly cement concrete composition for concrete prepared according to Examples 1 and 2 of the present invention had a reduced shrinkage of shrinkage compared to the cement concrete compositions prepared according to Comparative Examples 1 and 2, It can be confirmed that there is a reduction effect.

≪ Test Example 3 >

The environmentally friendly cement concrete compositions for ready-mixed concrete prepared according to Examples 1 and 2 and the cement concrete compositions prepared according to Comparative Examples 1 and 2 were tested according to the method specified in KS F 2476 (Test Method for Polymer Cement Mortar) The measurement results of the water absorption are shown in Table 3 below. If the water absorption rate is high, if the impurities or water penetrate into the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Absorption Rate (%) 1.0 0.9 2.3 2.0

As shown in Table 3, the eco-friendly cement concrete composition for concrete prepared according to Examples 1 and 2 had a lower water absorption rate than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2.

<Test Example 4>

Resistant cement concrete composition for concrete prepared according to Examples 1 and 2 and a cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were tested for resistance to chloride ion penetration by KS F 4042, Are shown in Table 4 below.

Example 1 Example 2 Comparative Example 1 Comparative Example 2 Chloride ion penetration resistance (coulombs) 820 790 1,850 1,600

As shown in Table 4 above, according to Example 1 and Example 2, the affinity light cement concrete composition for ready-mixed concrete showed less chloride ion penetration resistance than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2, And the resistance was high.

&Lt; Test Example 5 >

The results of measurement of the neutralization penetration depth according to the method defined in KS F 4042 for the environmentally friendly cement concrete composition for ready-mixed concrete and the cement concrete composition of Comparative Example 1 and Comparative Example 2 according to the above-described Examples 1 and 2 are shown in Table 5 Respectively.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) 0.8 0.7 0.5 1.1

As shown in Table 5, it can be seen that the environmental cement concrete composition for ready-mixed concrete according to Examples 1 and 2 has a lower neutralization penetration depth than Comparative Example 1 and Comparative Example 2 and is highly resistant to neutralization.

&Lt; Test Example 6 >

The eco-friendly cement concrete composition for concrete prepared according to Examples 1 and 2 and the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were tested according to the Japanese Industrial Standards Proposal [Test Method for Chemical Resistance by Solution Deposition of Concrete] The results of the chemical resistance test are shown in Table 6 below, in which the aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Weight change rate
(%) Hydrochloric acid -1.5 -1.3 -2.4 -2.3 Sulfuric acid -0.4 -0.3 -0.9 -0.8 Sodium hydroxide +0.5 +0.7 0 0.1

As shown in Table 6, the eco-friendly cement concrete composition for concrete prepared according to Example 1 and Example 2 showed less weight change rate with respect to chemical resistance than the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 And the resistance to chemical resistance was high.

&Lt; Test Example 7 >

The eco-friendly cement concrete composition for concrete prepared according to Examples 1 and 2 and the cement concrete composition prepared according to Comparative Example 1 and Comparative Example 2 were subjected to a thermal conductivity test using KS F 4039 and KFIA-FI-1004 Ammonia gas detection tube), and the far infrared ray radiation characteristic was measured with a contrast ratio of black body using an FT-IR spectrometer. The results are shown in Table 7 below.

Item Example 1 Example 2 Comparative Example 1 Comparative Example 2 Thermal conductivity (W / mk) 0.50 0.55 1.02 0.99 Deodorization (%) 95 96 82 80 Far-infrared radiation energy
(ㅧ 10 ² W / m ² m) 3.6 3.7 - -

As shown in Table 7, the performance of the environmentally friendly cement concrete composition for concrete prepared according to Examples 1 and 2 was much higher than that of the cement concrete compositions prepared according to Comparative Example 1 and Comparative Example 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (6)

As an eco-friendly cement concrete composition for ready-mixed concrete,
5 to 45% by weight of a binder, 15 to 75% by weight of a fine aggregate, 10 to 65% by weight of a coarse aggregate and 1 to 20% by weight of water,
The binder is usually composed of 26 to 80 wt% of Portland cement, 5 to 40 wt% of blast furnace slag, 1 to 20 wt% of volcanic ash, 0.1 to 20 wt% of desulfurized gypsum, 0.01 to 20 wt% of calcium aluminate, 0.01 to 10% by weight of water reducing agent, 0.01 to 5% by weight of water reducing agent, 0.01 to 5% by weight of thickening agent and 0.01 to 5% by weight of defoamer, 0.01 to 10% Further comprising 0.01 to 10% by weight of fibroparrite. &Lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt;
delete delete delete The method according to claim 1,
Wherein the fine aggregate comprises 30 to 95 wt% of sericite, 1 to 35 wt% of bottom ash, and 1 to 35 wt% of crushed sand.
The method according to claim 1,
Wherein the coarse aggregate comprises 10 to 95% by weight of crushed gravel and 5 to 90% by weight of sericite.