KR101912328B1 - Eco-friendly Composition of Ready Mixed Concrete in capable of reducing Scattering Dust - Google Patents

Abstract

The present invention relates to a method for manufacturing an eco-friendly ready-mixed concrete composition capable of reducing scattering dust, wherein the composition is characterized by comprising: 65-80 wt% of an aggregate; 10-27 wt% of a binder; 5-13 wt% of water; and 0.05-3.0 wt% of an admixture. The initial strength reduction due to the decrease of the cement usage amount is reduced, and the scattering dust generated is reduced when the ready-mixed concrete is poured.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-friendly ready-mixed concrete composition capable of reducing scattering dust,

The present invention relates to an environmentally friendly concrete composition capable of reducing scattering dust. More specifically, the present invention relates to an environmentally friendly concrete composition capable of reducing the initial strength deterioration caused by a decrease in the amount of cement used, To an environmentally friendly ready-mixed composition capable of reducing dust.

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.

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 post-installation structure, 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 a group of newborn symptoms. 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, the organism that causes sick house syndrome has a serious effect on the 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 the "indoor air quality law" was enacted and promulgated in May 2004, the newly built buildings were obliged to complete the inspection of the air quality from the environmental authorities before completion.

Especially, in the case of newly cured cement, various chemicals are poured out, which not only deteriorates health, but it also corrodes various indoor products. Therefore, it is required to develop a technology to fundamentally deviate from the environmental pollution.

Korean Patent Registration No. 10-1779565 (Sep. 19, 2017) discloses an eco-friendly cement concrete composition for remicon.

The eco-friendly cement concrete composition for a concrete mixer has improved functionality such as far-infrared ray emission characteristics, deodorization property, and heat insulation property, but there is a problem that a scattering dust is generated much when the concrete is installed.

KR 10-1779565 B1 2017.09.19.

It is an object of the present invention to provide an environmentally friendly concrete composition capable of reducing scattering dust generated when casting remicon, as well as improving initial strength reduction due to a decrease in cement usage.

In order to achieve the above object, the present invention provides the following means.

The present invention provides an environmentally friendly concrete composition capable of reducing scattering dust, comprising 65 to 80% by weight of an aggregate, 10 to 27% by weight of a binder, 5 to 13% by weight of a water and 0.05 to 3.0% by weight of an admixture.

The aggregate consisted of 35 wt% of gravel, 25 wt% of sand, 10 wt% of loess powder, 10 wt% of elvan, 5 wt% of ilite, 3 wt% of potassium feldspar, 3 wt% of lead oxide, 3 wt% of dolomite, % Zeolite, 2 wt% zeolite and 2 wt% tourmaline.

The binder is composed of 5 wt% of cement, 30 wt% of blast furnace slag, 20 wt% of fly ash, 15 wt% of stainless steel slag, 7 wt% of anhydrous gypsum, 7 wt% of calcium sulfoaluminate, 5 wt% 5 wt%, 3 wt% meta kaolin, and 3 wt% titanium dioxide powder.

The water is mineral water.

The admixture comprises 1 to 5 parts by weight of sodium gluconate in 100 parts by weight of the AE water reducing agent.

5 to 10 parts by weight of a strength enhancer is further mixed with 100 parts by weight of an environmentally friendly concrete composition capable of reducing scattering dust, wherein the strength enhancer comprises 5 to 10 parts by weight of calcium oxide (CaO) 5 to 10 parts by weight and 0.1 to 1 part by weight of an ethylene vinyl acetate resin.

Wherein the fugitive dust reducing material comprises 10 to 20 parts by weight of activated carbon and 1 to 5 parts by weight of bentonite in 100 parts by weight of a red shale, and 2 to 3 parts by weight of a fugitive dust reducing agent is further mixed in 100 parts by weight of an environmentally- Parts by weight.

The environmentally friendly concrete composition capable of reducing fugitive dust according to the present invention not only improves the initial strength drop due to the decrease in the amount of cement but also has the advantage of reducing scattering dust generated when the concrete is poured.

Hereinafter, the present invention will be described in detail.

First, an environmentally friendly concrete composition capable of reducing scattering dust according to the present invention will be described.

The environmentally friendly concrete composition capable of reducing the scattering dust of the present invention is characterized in that,

65 to 80% by weight of an aggregate, 10 to 27% by weight of a binder, 5 to 13% by weight of a water and 0.05 to 3.0% by weight of an admixture.

The aggregate consisted of 35 wt% of gravel, 25 wt% of sand, 10 wt% of loess powder, 10 wt% of elvan, 5 wt% of ilite, 3 wt% of potassium feldspar, 3 wt% of lead oxide, 3 wt% of dolomite, %, 2 wt% of zeolite and 2 wt% of tourmaline.

The loess has been widely used as a building material for building walls and floors of houses. In addition, flooring materials such as brick, earthenware and tile material, fish farm floor and stool floor have been used. The chemical composition of the loess is mainly composed of SiO ₂ , Al ₂ O ₃ , K ₂ O, Na ₂ O, CaO, TiO ₂ , Fe ₂ O ₃ , MgO and MnO. In addition, the efficacy of the loess is to remove the toxicity of the cement. Especially, the effect of far-infrared ray emission can be cited. The loess is absorbed in the human body by radiating the beneficial far-infrared rays and the metabolism is smooth and blood circulation becomes active. Promotion of aging, promotion of metabolism, and chronic fatigue. In addition, it is known that the humidity control effect is also excellent.

It is preferable that the loess mixture is baked at 900 to 950 ° C for 6 to 8 hours, cooled, and then pulverized so that the loess mixture can be maintained in a solid state even when water is mixed after mixing with other compositions. The above-mentioned loess powder preferably has a powder degree of 1,500 to 2,000 cm < 2 > / g.

The elvan is weathered by rocks belonging to the quartzite rocks in the igneous rocks and is fragile. Quartzite is often made of kaolinite (kaolinite) as white clay used as a raw material for ceramics, and biotite is almost a form of iron oxide. Elvanite has harmful substances removal, heavy metal decomposition, mineral leaching, water quality control and water purification, rich oxygen content, and far-infrared radiation. The main components of the elvanite are anhydrous silicic acid (SiO ₂ ) and aluminum oxide (Al ₂ O ₃ ), which are composed of 30,000 to 150,000 multi-layered porous materials per 1 cm 3. They have a large specific surface area and adsorb and decompose pollutants and heavy metals It also has cement toxicity neutralization, antibacterial, insecticide and strong deodorizing power.

The above-mentioned ilite ((K, H ₃ O) Al ₂ (Si, Al) ₄ O ₁₀ (H ₂ O, OH) ₂ ) is a clay-like fine hydrated silicate minerals and is a rare mica having Montmorillonite and Muscovite It is a clay mineral (Micalikeclay Minerals). Illite radiates 89 ~ 92% of far infrared rays of 2 ~ 25㎛ wavelength at room temperature. In addition, the deodorizing power is very strong, the water molecules are activated, the dissolved oxygen is 3 times or more, and the oxygen cohesion is strong. Ilrite has a great effect such as far-infrared radiation, toxic gas adsorption, negative ion generation, and the like.

The potassium feldspar is a feldspar-based mineral containing potassium as its main component, and its chemical composition is KAlSi ₃ O ₈ . This potassium feldspar replicates beneficial far infrared rays, and is excellent in the removal of heavy metals.

Kiyoseki is a new material that emits a large amount of negative ions and emits the best far-infrared rays at room temperature. It exists in a mine formed by the high-temperature random water action due to the crustal fluctuation. It is a mysterious substance, Is the only natural stone produced in Gunma Prefecture in Japan.

The dolomite is a parabolic mineral, formed by dolomitization of calcite, similar to calcite. Dolomite has a property of emitting a large amount of far infrared rays.

In addition to the semiconducting properties, germanium has various effects such as enhancing the immunity of the human body, inducing interferon production, promoting endorphin production, dehydrogenating action, admiral action, and discharging heavy metals in the body. Germanium emits far - infrared rays to convert water in the body into OH ^- groups to regulate current flow in body cells to promote blood flow, as well as to supply oxygen to the cells to activate the cells.

The zeolite is a kind of hydrated aluminum silicate mineral containing alkali metal or alkaline earth metal as minerals obtained from volcanic rocks, and has a structure in which tetrahedrons of (Si, Al) O4 are bonded in a cubic network. And it is possible to adsorb a large amount of water at the same time while keeping the molecular sieve function at the same time. The pore shape is maintained even at high temperature, and ammonia and heavy metals, toxic substances And is not discharged again even when it is saturated. The hard water is used as a filter medium formed of soft water. The structural features of zeolite include the ability to selectively adsorb unsaturated hydrocarbons or polar substances by the action of cations in the crystal structure and to have a certain size of pore size so that smaller molecules are selectively passed through and adsorbed Using this molecular sieve effect, it is possible to separate n-paraffin and isoparaffin, or ortho, meta and para isomers. In addition, since it contains exchangeable cations in the crystal structure, it can easily exchange ions with other cations freely. By using this property, it is possible to remove harmful substances, concentrate and recover useful components.

The tourmaline is the only mineral in the earth that has the property that the particles generate electricity by minute heat to flow weak current, which is also called tourmaline. Therefore, when heat is brought into contact with the human body (body temperature) or heat is transferred by the heat of heating, a weak current is generated in the tourmaline layer, and a synergistic effect of heating appears. Tourmaline is also known to have properties such as antibacterial, deodorizing and cleaning effects due to the generation of a large amount of negative ions.

The binder is composed of 5 wt% of cement, 30 wt% of blast furnace slag, 20 wt% of fly ash, 15 wt% of stainless steel slag, 7 wt% of anhydrous gypsum, 7 wt% of calcium sulfoaluminate, 5 wt% 5 wt%, 3 wt% meta kaolin, and 3 wt% titanium dioxide powder.

The cement may be at least one selected from the group consisting of Portland cement, blast furnace slag cement and fly ash cement. If the cement content is less than 5% by weight based on the total weight of the binder, there is a problem in expressing the concrete strength. If the cement content is more than 5% by weight, the effect of reducing carbon dioxide emission is small.

The blast furnace slag powder is an industrial by-product generated when pig iron is manufactured in blast furnace blast furnace, and has an effect of reducing hydration heat, and also has potential hydraulic property which makes concrete excellent in long-term strength. Further, the blast furnace slag fine powder has a high resistance to chemical erosion such as seawater and sewage, and has a pore filling effect and an alkali aggregate reaction inhibiting effect, thereby enhancing the durability of concrete.

The fly ash itself has no hydraulic property, but the silica component slowly reacts with calcium hydroxide, which is a hydration product of cement, to form a stable insoluble compound and cure.

The stainless steel slag is the elution of calcium ions increases initially accelerates the cement hydration reaction of the mineral 3CaO · SiO ₂ is excellent in expression of early strength.

The anhydrous gypsum (CaSO ₄ ) reacts with the components in the cement, especially C ₃ A ( ₃ CaO.Al ₂ O ₃ ), to form an ettringite (AFt phase, C ₃ A ₃ .CaSO ₄ .32H ₂ O) The amount of etrinzate produced decreases with the progress of hydration, or a part of it decreases to monosulfate (AFm phase, C ₃ A · CaSO ₄ · 12H ₂ O). The nitrite produced in this way increases the penetration resistance to chlorides even in the long term by densely filling the pores in the concrete structure.

The calcium sulfoaluminate is an inorganic fastidious mineral material that is added to increase hydration reactivity and inhibit cracking. It reacts with water instantaneously in contact with water to form an ettringite hydrate, It is possible to obtain an excellent compressive strength in a short time.

The expanded pearlite fine powder is in the form of a fine powder obtained by heating and expanding conventional pearlite and finely pulverized. The pearlite expanded powder is filled with pores in a long period of time . The expanded pearlite fine powder preferably has a particle size of 300 to 400 mesh.

The sodium silicate is also referred to as sodium silicate and is a powdery anhydrous product obtained by solidifying a mixture of quartz and sodium carbonate by heating and melting at 1,000 ° C. When the aqueous solution is added with water, it becomes hydrolyzed to become alkaline, ). When the waterglass comes into contact with other materials, it quickly cures and exhibits a strong adhesive force. The sodium silicate reacts with water to become waterglass and harden to increase the initial strength.

The metakaolin is a pozzolanic substance and the pozzolan material is amorphous silica and alumina. The porosity of the porous material is 30% or more. It is not solidified by itself, but calcium hydroxide (Ca (OH) ₂ ) to solidify.

The titanium dioxide is a material which satisfies various conditions required for a photocatalyst material, and it has abundant reserves in terms of resource material, and is an environmentally friendly material, and has chemical and biological stability characteristics. In the titanium dioxide powder, when ultraviolet rays having a certain energy level or more are applied to the surface of the catalyst material, electrons are transferred to the surface of the particles, thereby forming holes. The holes thus formed react with oxygen or water in the air to form a compound having strong oxidizing power, thereby sterilizing bacteria on the surface of the catalyst material and controlling harmful substances. The hydroxyl radical oxidizes the organic material and decomposes it into carbon dioxide and water. Environmental pollutants that can treat titanium dioxide powder with these effects are water pollutants and air pollutants. Examples of air pollutants that can be treated include organic chlorine compounds, volatile hydrocarbons, aldehydes, ketones, alcohols, phenols, odorous substances (ammonia, hydrogen sulfide, etc.), nitrogen compounds and sulfur oxides.

It is preferable to use mineral water as the water.

The mineral water is water containing minute amounts of minerals such as calcium, magnesium, potassium, etc. It is also called mineral water. It is a spring water springs from the ground and contains a large amount of gaseous or solid matter. It is said that hot spring is over 25 degrees Celsius in 1000 won, cold spring is below, and mineral water usually refers to the latter.

Preferably, the admixture comprises 1 to 5 parts by weight of sodium gluconate in 100 parts by weight of the AE water reducing agent.

The sodium gluconate serves to retard the rate at which the cement composition condenses. Specifically, the gluconic acid-based compound prevents the concrete composition from prematurely agglomerating at a predetermined coagulation rate or higher, thereby preventing the deterioration of the workability and durability of the concrete composition. If less than 1 part by weight of sodium gluconate is added to 100 parts by weight of the AE water reducing agent, the concrete composition may quickly coagulate to deteriorate the workability and durability. If the amount exceeds 5 parts by weight, the concrete composition may be delayed and consequently, the workability and durability may deteriorate do.

5 to 10 parts by weight of a strength-increasing material may be further mixed with 100 parts by weight of an environmentally friendly concrete composition capable of reducing scattering dust.

It is preferable to mix 5 to 10 parts by weight of the strength-enhancing material with 100 parts by weight of the environmentally friendly concrete composition capable of reducing the scattering dust. If the strength-increasing material is included in an amount less than 5 parts by weight, The workability of the concrete may be deteriorated. The strength enhancing material can increase the initial strength of the ready-mixed concrete by filling the pores between the ready-mixed concrete to form more detailed concrete structure and accelerating the initial hydration reaction.

Preferably, the strength enhancer includes 5 to 10 parts by weight of calcium oxide (CaO), 5 to 10 parts by weight of calcium sulfate, and 0.1 to 1 part by weight of an ethylene vinyl acetate resin in 100 parts by weight of the rice husk material.

The rice hull plays a role of maintaining the hydration reaction in the long term.

The calcium oxide is to react with water produced the Ca (OH) ₂ to form a stable calcium silicate reacts with the SiO ₂ affects the strength of the concrete. When the amount of calcium oxide is less than 5 parts by weight with respect to 100 parts by weight of the rice husk ash, there is a problem that the strength of the concrete is weakened. When the amount exceeds 10 parts by weight, unreacted materials occur.

The calcium sulfate accelerates the hydration reaction initially. If the amount of calcium sulfate is less than 5 parts by weight based on 100 parts by weight of the rice husk ash, there is a problem that the initial strength of the concrete is weakened. If the amount exceeds 10 parts by weight, unreacted materials are generated.

The ethylene vinyl acetate resin has excellent properties such as elasticity, flexibility and weatherability and is resistant to stress cracking. The above-mentioned ethylene vinyl acetate resin means vinyl acetate and ethylene copolymer, and the existing liquid resin is prepared in the form of a powder as a re-melting type powder resin. The weight average molecular weight of the resin is preferably 10 ⁵ to 10 ⁶ . When the ethylene vinyl acetate resin is mixed with a cement component, since the resin forms a uniform resin film between the cement particles as a binder, the void spaces of the voids of the cement, which is a weak part of the cement, Adhesion strength and tightness are greatly increased. In addition, the ethylene vinyl acetate resin can exhibit an appropriate elastic modulus and strength so as to behave like a structure in a change of shrinkage and expansion due to vibration or temperature change of the structure. If the content of the ethylene vinyl acetate is less than 0.1 part by weight based on 100 parts by weight of the rice husks, the effect of improving the bonding strength is not sufficient. If the amount exceeds 1 part by weight, basic properties of the cement mortar deteriorate.

2 to 3 parts by weight of the scattering-reduction material may be additionally mixed with 100 parts by weight of the environmentally-acceptable concrete composition capable of reducing the scattering dust.

It is preferable to mix 2 to 3 parts by weight of the scattering-reduction material with 100 parts by weight of the environmentally-acceptable concrete composition capable of reducing the scattering dust. If the amount of the scattering-reduction material is less than 2 parts by weight, sufficient scattering- If the amount is more than 3 parts by weight, the workability of the concrete may be deteriorated.

The fugitive dust reduction material preferably includes 10 to 20 parts by weight of activated carbon and 1 to 5 parts by weight of bentonite in 100 parts by weight of the red shale.

The red shale is also referred to as dodecahydrate. The red shale is composed of components such as Al ₂ O ₃ , Fe ₂ O ₃ , Na ₂ O ₃ , K ₂ O, and magnesium sulfate. The red shale has a function of adsorbing harmful substances and it is also possible to control the humidity.

The activated carbon is used not only to remove taste, odor or color but also to remove carcinogens such as decomposable organic substances, chlorine disinfection by-products such as THM (trihalomethane), benzene, and toluene And its application range is gradually expanding. In the activated carbon made by carbonization of coconut shell, coal, wood, etc. at high temperature, there is a porous structure having high adsorption performance. By using such a large number of pores, adsorbable harmful substances are removed. Typical activated carbons have a relatively large internal surface area of 800 to 1,200 m < ³ >

The bentonite was first discovered in France, and mine is widely distributed in Gyeongbuk province in Korea. Since bentonite is a volcanic mineral, it has properties such as high viscosity, wide specific surface area, swelling property, adsorption property and ion exchange property and is used in various fields such as waterproofing agent, cosmetics, paint, casting, . Particularly, it has a relatively large specific surface area and has a high ion exchange capacity. Therefore, it has been used as a wastewater for preventing contamination of heavy metals and organic matter, and for preventing contamination of soil and groundwater around a landfill.

The environmentally friendly concrete composition capable of reducing fugitive dust according to the present invention not only improves the initial strength drop due to the decrease in the amount of cement but also has the advantage of reducing scattering dust generated when the concrete is poured.

Hereinafter, the constitution and effects of the present invention will be described in more detail through examples. These embodiments are only for illustrating the present invention, and the scope of the present invention is not limited by these embodiments.

73% by weight of aggregate, 20% by weight of binder, 6.9% by weight of water and 0.1% by weight of admixture were mixed to prepare an environmentally friendly concrete composition capable of reducing scattering dust. The aggregate consisted of 35 wt% of gravel, 25 wt% of sand, 10 wt% of loess powder, 10 wt% of elvan, 5 wt% of ilite, 3 wt% of potassium feldspar, 3 wt% of lead oxide, 3 wt% of dolomite, %, 2% by weight of zeolite and 2% by weight of tourmaline. The binder is composed of 5 wt% of cement, 30 wt% of blast furnace slag, 20 wt% of fly ash, 15 wt% of stainless steel slag, 7 wt% of anhydrous gypsum, 7 wt% of calcium sulfoaluminate, 5 wt% 5% by weight, 3% by weight of metakaolin and 3% by weight of titanium dioxide powder. The cement was usually Portland cement. The blast furnace slag fine powder having a powder degree of 5,000 cm < 2 > / g was used. Mineral water was used for the water. The admixture was prepared by mixing 100 parts by weight of the AE water reducing agent and 3 parts by weight of sodium gluconate.

In the same manner as in Example 1, except that 5 parts by weight of the strength-increasing material was further mixed with 100 parts by weight of the environmentally-acceptable concrete composition capable of reducing the scattering dust, an eco-friendly ready-mixed composition capable of reducing scattering dust was prepared. 5 parts by weight of calcium oxide (CaO), 5 parts by weight of calcium sulfate and 1 part by weight of an ethylene vinyl acetate resin were mixed with 100 parts by weight of the rice husk material. The rice husks were burned at a temperature of 400 DEG C and pulverized to an average particle size of 3 mm.

[Comparative Example 1]

Except that in Example 1, the aggregate was mixed with 55 wt% of gravel and 45 wt% of sand, the Portland cement was used as the binder, the water was used as the water and the general AE water reducing agent was used as the admixture. To prepare a concrete composition.

[Experimental Example 1]

The concrete properties were evaluated for Examples 1 and 2 and Comparative Example 1. The compressive strength was measured according to the standard of KS F2405 at 3 days, 7 days and 28 days. These concrete specimens were prepared in accordance with KS F2403. The molds were cured so as not to dry at room temperature of 21 ° C until they were removed. After the molds were removed, strength tests were carried out in water or in a wet room at a temperature of 21 ° C The results are shown in Table 1 below.

division
SLUMP FLOW
(Mm)
Air volume (%)
Concrete Compressive Strength (MPa) 3 days 7 days 28th Example 1 650 3.5 20.3 35.9 45.6 Example 2 640 3.5 22.5 38.3 49.8 Comparative Example 1 660 3.4 15.4 30.1 38.2

According to Table 1, it can be confirmed that the compressive strength of Examples 1 and 2 is superior to that of Comparative Example 1 from the beginning to the 28th day of age.

[Experimental Example 2]

A specimen was prepared using the concrete compositions of Example 1 and Comparative Example 1. The specimen is a standard specimen having a diameter of 100 m / m and is made by the method specified in KS F2403. The specimen is subjected to heavy metal content test (hexavalent chromium). The specimen is shown in Table 2, Respectively.

For heavy metal content, 1 g of sample was extracted with 50 ml Alkaline Solution (Na ₂ CO ₃ + NaOH + MgOH + Phosphate Buffer) at 90 ° C for 1 hour and analyzed by UV / VIS Spectrophotometer (540 nm).

Test items (hexavalent chromium) Test results (mg / kg) Test Methods Example 1 Not detected EPA 3060A
Comparative Example 1 2.9

According to Table 2, it was confirmed that in Comparative Example 1, 6.9 mg / kg of hexavalent chromium was detected, whereas in Example 1, no hexavalent chromium was detected.

The test method for heavy metal degradation test was tested according to the test method of KS L2018, EPA 3052, KS M3719, KS D1662, and tested at 20 ~ 22 ℃ and 48 ~ 52% R.H.

Test Items
Test results (mg / kg) Heavy metal removal rate
Comparative Example 1 Example 1 Pb (lead) 25.9 2.9 89% Cd (Cadmium) 2.1 0.1 95% As (arsenic) 8.7 0.5 94%

As shown in Table 3, according to Comparative Example 1, the lead (Pd) component was 25.9 mg / kg, the cadmium (Cd) component was 2.1 mg / kg, and the arsenic (As) component was 8.7 mg / kg. Example 1 showed that a heavy metal (Pd) component with a removal rate of 89%, a cadmium (Cd) component of 0.1 mg / kg, a removal rate of 95%, an arsenic component of 0.5 mg / It is confirmed that the ability to remove heavy metals is one of the causes of sick house syndrome.

[Experimental Example 3]

A specimen was prepared using the concrete composition of Example 1. The specimen is a standard specimen having a diameter of 100 m / m, manufactured and cured by the method specified in KS F2403 for 28 days, and subjected to an anion test, and is shown in Table 4.

Test Items Test result Test Methods Anion (ION / cc) 97 KICM-FIR-1042

As shown in Table 4, 97 ION / cc of anions are generated, indicating that the effect of improving the living environment is excellent due to the physiological activity by the magnetic resonance waves of C. B. M.

In Example 1, an eco-friendly ready-mixed composition capable of reducing scattering dust was manufactured in the same manner except that 3 parts by weight of the scattering-reduction material was further mixed with 100 parts by weight of the environmentally-friendly concrete composition capable of reducing the scattering dust Respectively. The fugitive dust reduction material was prepared by mixing 10 parts by weight of activated carbon and 5 parts by weight of bentonite with 100 parts by weight of a red shale having a particle size of 100 mesh.

[Experimental Example 4]

The laid-in compositions of Examples 1 and 3 and Comparative Example 1 were laid and cured, and the amount of scattered dust was measured at a wind speed of 9 m / sec. As a result, scattering inhibition rates were as shown in Table 5 below.

division Fugitive suppression rate [%] Example 1 95.51 Example 3 97.82 Comparative Example 1 50.88

It can be confirmed that at least 90% of the scattering dust suppressing effect is exhibited at a wind speed of 9 m / sec when curing after pouring using an environmentally friendly concrete composition capable of reducing scattering dusts of Examples 1 and 3.

The environmentally friendly concrete composition capable of reducing fugitive dust according to the present invention not only improves initial strength deterioration due to a decrease in the amount of cement used but also has the advantage of reducing fugitive dust generated when concrete is poured, It can be used for buildings such as single-family houses.

Claims (7)

2 to 3 parts by weight of a fugitive dust reducing agent and 5 to 10 parts by weight of a reinforcing agent are added to 100 parts by weight of a mixture of 65 to 80% by weight of an aggregate, 10 to 27% by weight of a binder, 5 to 13% by weight of a water and 0.05 to 3.0% 10 parts by weight,
The aggregate consisted of 35 wt% of gravel, 25 wt% of sand, 10 wt% of loess powder, 10 wt% of elvan, 5 wt% of ilite, 3 wt% of potassium feldspar, 3 wt% of lead oxide, 3 wt% of dolomite, % Zeolite, 2 wt% zeolite and 2 wt% tourmaline,
The binder is composed of 5 wt% of cement, 30 wt% of blast furnace slag, 20 wt% of fly ash, 15 wt% of stainless steel slag, 7 wt% of anhydrous gypsum, 7 wt% of calcium sulfoaluminate, 5 wt% 5% by weight, 3% by weight of metakaolin and 3% by weight of titanium dioxide powder,
The water used is mineral water,
Wherein the admixture comprises 1 to 5 parts by weight of sodium gluconate in 100 parts by weight of the AE water reducing agent,
The fugitive dust reduction material includes 10 to 20 parts by weight of activated carbon and 1 to 5 parts by weight of bentonite in 100 parts by weight of a red shale,
Wherein the strength enhancer comprises 5 to 10 parts by weight of calcium oxide (CaO), 5 to 10 parts by weight of calcium sulfate, and 0.1 to 1 part by weight of an ethylene vinyl acetate resin,
An environmentally friendly concrete composition capable of reducing scattering dust.
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