KR101924887B1 - Eco-friendly Composition of Soil Concrete - Google Patents

Abstract

The present invention relates to an eco-friendly soil concrete composition, which contains, based on 100 parts by weight of the soil, 40 to 50 parts by weight of an aggregate, 10 to 15 parts by weight of a cementation material, 15 to 20 parts by weight of an adhesive and 6 to 10 parts by weight of a loess powder. Since cement is not used, there is an advantage of not only preventing pollution with heavy metal harmful to the environment but also having excellent permeability as well as compressive strength.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-

The present invention relates to an eco-friendly soil concrete composition, and more particularly, to an eco-friendly soil concrete composition which does not use cement, and thus is excellent in permeability as well as compressive strength while preventing heavy metal pollution harmful to the environment.

In general, road pavement is a road surface structure treated to improve the road surface and to enhance the flatness of the road to facilitate human traffic and running of the vehicle. It is a layer structure composed of several layers. Depending on the material of the surface layer, , Concrete-based pavement and block pavement.

In recent years, eco-friendly green industry has become a major part of the world, and this has also affected the construction sector, replacing asphalt and cement, which are the main causes of desertification in the city. It is environmentally friendly, It is widely used for the construction of roads, parks, playgrounds, walkways, and sidewalks.

Unlike asphalt concrete and concrete pavement using the existing aggregate, the soil pavement method using the soil is a package using cement or a solidifying agent to the surrounding soil such as granite weathered soil, and the soil pavement is a bicycle Roads, parking lots, roads in housing complexes, farm roads, walkways, park plazas, etc., and various additives are used mainly for potting cement.

Conventionally, the soil pavement method used is divided into two types of wet and dry pavement. The wet pavement method is a method in which a part of mashato or yellow soil is mixed with a general concrete mixture using a cement fire or general cement. It is convenient to produce concrete concrete composition. However, it is efficient by using remicon plant. However, since the cement is used in a large amount, environmental problems may be a problem and the surface strength is low, so that the resistance to freezing and thawing is very low. In addition, the dry pavement method has a high strength and a good durability because it is blended with a non-flowable blend in the field. However, because of problems such as site mixing, transportation, and piling, construction is poor, construction cost is high due to manpower laying, The surface hardness is low due to the surface roughness of the surface, and the second surface treatment is performed after the second surface strengthening agent is installed.

Especially, the soil used in the soil pavement construction method has a problem that it is difficult to use it as it is because it is a material having a relatively small aggregate shape containing a very wide variety of components and having a considerably low binding force.

Because of the above-mentioned problems, conventional pavement methods using the soil can solidify the soil at a low cost and are easy to use. Therefore, cement such as portland cement, slag cement and fly ash cement is widely used as a binder for solidifying soil .

Korean Patent Registration No. 10-1454422 (Apr. 27, 2014) discloses an eco-friendly inorganic solidifying composition, a method for producing earth concrete that is resistant to freezing and calcium chloride using the same, and a method for constructing a dirt road pavement construction.

Although the soil concrete using the environmentally friendly inorganic solidifying composition has an advantage of durability, adhesion strength and bending strength, the inorganic solidifying composition contains portland cement in an amount of 40 to 60 wt%, and thus has a disadvantage that heavy metals are eluted.

KR 10-1454422 B1 2014.10.27.

It is an object of the present invention to provide an eco-friendly soil concrete composition that does not use cement and thus is excellent in permeability as well as compressive strength while preventing heavy metal pollution harmful to the environment.

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

The present invention

The eco-friendly soil concrete composition according to the present invention does not use cement, so it has an advantage of being excellent not only in compressive strength but also in permeability, while preventing heavy metal pollution harmful to the environment.

Hereinafter, the present invention will be described in detail.

First, an eco-friendly soil concrete composition according to the present invention will be described.

In the eco-friendly soil concrete composition of the present invention,

40 to 50 parts by weight of an aggregate, 10 to 15 parts by weight of an aggregate, 15 to 20 parts by weight of an adhesive, and 6 to 10 parts by weight of a loess powder, based on 100 parts by weight of soil.

It is preferable that the soil is made of a mashato. Because the natural texture of the soil can be maintained and the drainage is excellent, the Masato can prevent the depletion of groundwater, and can secure pedestrians and bicycle safety during rainy weather. Because of its excellent air permeability, surface temperature is lower than that of general pavement. It is possible to reduce the temperature rise of the entire atmosphere due to the heat. It is preferable that the above-mentioned Masato has a particle size range of 2 to 6 mm. If the lower limit of the particle size range of the above-mentioned Masato is less than 2 mm, the pores may be blocked to decrease the permeability. If the upper limit of the particle size range is more than 6 mm,

The aggregate preferably has a diameter of 6 to 13 mm. If the diameter of the aggregate is less than 6 mm, there is a problem that material separation phenomenon occurs when it is mixed with other compositions. When the diameter exceeds 13 mm, it is difficult to form a beautifully shaped composition because the compounded composition is not well-

The aggregate is preferably contained in an amount of 40 to 50 parts by weight with respect to 100 parts by weight of the soil. When the aggregate is contained in an amount of less than 40 parts by weight, the strength is lowered.

It is preferable that 10 to 15 parts by weight of the fireproofing agent is contained with respect to 100 parts by weight of the soil. If the fireproofing agent is contained in an amount of less than 10 parts by weight, durability is deteriorated. If the fireproofing agent is contained in an amount exceeding 15% by weight, .

The solidifying sludge comprises 30 to 40 wt% of purified water sludge, 10 to 15 wt% of granite sludge, 6 to 10 wt% of polysilicon sludge, 20 to 30 wt% of blast furnace slag, 6 to 10 wt% of lime, By weight and 1 to 5% by weight of rice husk.

The purified sludge is generated during coagulation-precipitation, which is a treatment process for production of tap water. The flocculant is used to coagulate suspended solids contained in raw water. The dried powder is composed of SiO ₂ , Al ₂ O ₃ contains a large amount of amorphous pozzolanic reactants. The purified water sludge dried powder is added in an amount of 30 to 40% by weight. If the purified sludge dried powder is less than 30% by weight, there is a problem of poor water permeability. If it is more than 40% by weight, unreacted matters are generated.

The granite sludge is a mixture of granite powder and water. The granite consists of quartz, mica, and feldspar (Na ₂ O, Al ₂ O ₃ , 6SiO ₂ ). The biotite in the mica is radiated and the feldspar is very strong. Spread more than 10m. Feldspar _{(Na 2 O, Al 2 O} 3, 6SiO 2) is a Streptococcus tetrahedron, which is a Si tetrahedron and Al tetrahedra, there is a Na ion of one equivalent of coupling for each of Al ions, these bases are crushed mineral It becomes a time substitution property. Therefore, when the feldspar is pulverized, the amount of base substitution is increased, and when the pulverization is carried out by wet pulverizing, it is discharged into water. Feldspar is different from ordinary silica sand or silica.

In the case of silica sand, the SiO ₂ content is 90 ± 5% and the Al ₂ O ₃ content is less than 5%. On the other hand, the feldspar has a SiO ₂ content of 75~85% and an Al ₂ O ₃ content of about 15~25% And the generation rate and production rate of the granite are high. When the granite powder is mixed with the binder due to such characteristics and principles, the initial strength is increased and the drying shrinkage is reduced due to the expandability of the feldspar, and the generation of cracks can be remarkably reduced. Particularly, the granite sludge obtained from the process of quarrying and granulating the granite waste granite and the granite from the process of using the waste granite and the sludge sludge from the process of granulating the granite or quarrying the granite is precipitated (precipitation coagulant: , Solid Al ₂ O ₃ (17%)) and dried in the form of a cake.

The polysilicon sludge has a characteristic light gray color. The polysilicon sludge has a moisture content of 62% and is discharged at a high water content. It has a low density and a light weight, and has a fineness of 7122 cm 3 / g as a powder. Its chemical composition is mostly composed of SiO ₂ and CaO, ₂ O and Na ₂ O are contained in trace amounts. After drying the polysilicon sludge powder at 60 ° C for more than 24 hours, the obtained crystal phase is composed of CaCO ₃ and contains a small amount of NaCl, which is a compound of Na ₂ O and Cl.

The blast furnace slag is produced as a by-product when producing pig iron in a steel mill, and is amorphous by quenching and has a basicity of 1.6 to 2.0. The blast furnace slag is generally composed of CaO 40 to 50 wt%, MgO 1 to 10% by weight, Al ₂ O ₃ 10 to 25% by weight and SiO ₂ 33 to 38% by weight, and the like.

The blast furnace slag is crushed using a ball mill or the like in order to increase the reactivity, so that the blast furnace slag has a specific surface area of 8,000 to 8,500 cm ² / g.

The blast furnace slag is added in an amount of 20 to 30% by weight. When the blast furnace slag is less than 20% by weight, the reactivity increases due to the increase in the weight percentage of lime and gypsum, The initial reaction and the settling time are delayed, which makes it difficult to secure initial strength.

The lime and gypsum are used as an activator. When blast furnace slag powder comes into contact with water, a dense impermeable acid film is formed on the surface of slag particles. In order to continue the reaction, it is necessary to destroy the acid film by the activating agent. Plaster is used.

When the dissolution reaction occurs on the surface of the blast furnace slag by the activation of lime and gypsum, the insoluble matter precipitates and begins to cure from the solution. The blast furnace slag is composed of Ca (OH) ₂ produced by the reaction of lime and water To form a hydrate. The hydrate of the blast furnace slag may contain calcium silicate hydrate by the activating agent, may form ettringite or aluminum hydroxide, thereby compensating for shrinkage of the cured body, forming dense texture, and contributing to increase the compressive strength do. In addition, gypsum acts as a stimulant in the latent hydraulic reaction, which is a characteristic of the slag fine powder, thereby enhancing the reactivity of the slag fine powder and serving as an auxiliary agent for further improving the strength.

These blast furnace slag hydrates maximize the bonding force between the soil particles when mixed with the soil, fix various organic substances in the soil and increase the strength, and in the case of soil contaminated with heavy metals, the hydrates may fix heavy metals.

When the amount of Ca (OH) ₂ is less than 6% by weight, the amount of Ca (OH) ₂ which contributes to the formation of hydrate etrinite of the blast furnace slag is insufficient, If the Ca (OH) ₂ is added in an amount exceeding 10% by weight, the Ca (OH) ₂ remaining unreacted may act as a cause of swelling and cause a problem.

The gypsum may be a gypsum of any one of anhydrous gypsum, semi-gypsum and alum gypsum, or a mixture of two or more kinds of gypsum. Preferably, the gypsum is added in an amount of 1 to 5 wt% The amount of the nitrile is excessively increased to expand the structure and inhibit the smooth development of the strength.

The rice hull plays a role of maintaining the hydration reaction in the long term. If the rice hull ash content is less than 1% by weight, the durability enhancement effect is deteriorated. If the rice hull material content is more than 5% by weight, harmonization of reactants is deteriorated.

Preferably, the rice husk ash is produced by burning rice husk at a temperature of 600 to 650 ° C and pulverizing the rice husk to an average grain size of 100 to 200 μm. There is an advantage that a rice husk material containing a large amount of highly reactive amorphous silica (SiO ₂ ) is used by burning the rice husk at a temperature of 600 to 650 ° C. If the combustion temperature for burning the rice husk is less than 600 ° C, the combustion effect tends to be insignificant and the generation of unburned rice husk is likely to occur partially. In order to sufficiently burn the rice husk, there is a problem that it must be burned for a long time. The resulting silica is formed into a crystalline silica in the form of a bar, which makes it difficult to finely grind the powder, resulting in a low bonding strength and a poor strength-enhancing effect.

The adhesive is preferably contained in an amount of 15 to 20 parts by weight with respect to 100 parts by weight of the soil. When the adhesive is contained in an amount less than 15 parts by weight, there is a problem that the adhesive strength is deteriorated. When the adhesive is contained in an amount exceeding 20% by weight, .

Wherein the adhesive comprises 30 to 40 wt% of amorphous calcium aluminate, 6 to 10 wt% of sodium aluminate, 6 to 10 wt% of polyester polyol, 3 to 5 wt% of isocyanate, 6 to 10 wt% of potassium methyl silicate, 11 to 15% by weight of aluminum oxide, 6 to 10% by weight of aluminum oxide, 11 to 15% by weight of ethylene-vinyl acetate and 1 to 5% by weight of toluene diisocyanate trimer.

The amorphous calcium aluminate is added for sintering to lower the water content of the clay and increase the initial strength. The amorphous calcium aluminate is an environmentally friendly material because it has no irritation to the human body and does not cause harmful dissolution of harmful components. In addition, when the amorphous calcium aluminate is bound to a certain amount of sodium aluminate, which is an aluminum-based liquid-phase quick-setting filler, it is possible to further enhance the toughness and ensure stability. If it is added in an amount of less than 30% by weight, the toughness decreases. If it is more than 40% by weight, the fluidity is deteriorated and the workability is deteriorated.

The sodium aluminate is a representative aluminum-based liquid-phase quick-setting admixture. Such sodium aluminate is commonly used as a coagulation agent, which is added to assist in the amorphous calcium aluminate, which is also intended to be environmentally friendly. If it is added in an amount of less than 6% by weight, the cohesive force is lowered and the spinning efficiency is lowered. If it is more than 10% by weight, excessive flocculation will deteriorate the flowability.

The polyester polyol is added to improve flowability and flowability. Such a polyester polyol is intended to induce a urethane reaction. The polyester polyol reacts with an isocyanate to be described later to form a urethane bond, thereby improving the adhesion. At this time, the polyester polyol is obtained together with the ester group generation by polymerizing a diol and a diacid, which are one kind of alcohol having two hydroxyl groups in the molecule. When the amount is less than 6% by weight, the fluidity is deteriorated. When the amount is more than 10% by weight, fluidity is improved but the fastness (compressibility) and compressive strength are lowered.

The isocyanate is added to react with the polyol to form an unsaturated polyurethane bond to improve the adhesion. Although such isocyanates are added in small amounts, they are one of the important components, for example, by inducing an urethane bond with an alcohol of a polyol. If it is added in an amount of less than 3% by weight, the reactivity with the polyester polyol tends to be deteriorated to deteriorate the adhesiveness. When the content is more than 5% by weight, the reactivity is rapidly activated and the flowability is deteriorated.

Potassium Methyl Siliconate reacts with carbon dioxide gas in the air to form a rubber-like polymer network material to form a hydrophobic coating, thereby improving the water repellency of the soil .

The above silicon dioxide (SiO ₂ ) plays a role of preventing yellowing and enhancing the strength. The amount of silicon dioxide (SiO ₂ ) is preferably 11 to 15% by weight, and if it is less than 11% by weight, yellowing may occur and strength may be lowered. If the amount is more than 15% by weight, It can break like glass.

The aluminum oxide (Al ₂ O ₃ ) plays a role of facilitating the mixing of silicon dioxide with other materials while smoothing the surface of the adhesive. It is preferable that the aluminum oxide (Al ₂ O ₃ ) is contained in an amount of 6 to 10% by weight. When the content is less than 6% by weight, there is a problem that the materials are not mixed smoothly. There is a problem that physical properties after bonding are changed.

The ethylene-vinyl acetate can improve the adhesiveness, the solubility, the hot tack property, the low-temperature property, the flexibility and the adhesive strength. Specifically, the ethylene-vinyl acetate is contained in an amount of 15 to 40 wt.% Of vinyl acetate in the ethylene- , Preferably 20% by weight to 30% by weight.

The toluene diisocyanate trimer serves as a curing agent. If the amount is less than 1% by weight, the curing rate may be lowered. If the amount is more than 5% by weight, the bonding strength may be weakened.

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 calcined at 800 to 850 ° C for 4 to 5 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. It is preferable that the loess powder has a powderity of 2,500 to 3,000 cm < 2 > / g.

The eco-friendly soil concrete composition of the present invention may further comprise 6 to 10 parts by weight of the strength-enhancing material per 100 parts by weight of the soil. If 100 parts by weight of the soil contains less than 6 parts by weight of the strength-increasing material, the effect of improving the initial strength is insufficient. If the amount is more than 10 parts by weight, the workability may be deteriorated.

The strength enhancer may be selected from the group consisting of 30 wt.% Of red shale, 20 wt.% Of activated carbon, 15 wt.% Of bentonite, 10 wt.% Of elvanite, 7 wt.% Of Ililite, 5 wt.% Of lead oxide, 4 wt.% Of dolomite, % And 2% by weight of tourmaline.

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 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.

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.

6 to 10 parts by weight of a fiber reinforcing material may be further added to 100 parts by weight of the soil. If the fibrous reinforcement is contained in an amount of less than 6 parts by weight in 100 parts by weight of the soil, the cracking inhibiting ability may be deteriorated. If the amount exceeds 10 parts by weight, the water permeability may be lowered.

The fiber reinforcing material includes 50% by weight of PBO fibers, 30% by weight of carbon fibers, and 20% by weight of cellulose fibers.

The PBO fiber (poly (p-phenylene-2,6-benzobisoxazole)) has a large tensile modulus and elastic modulus, and the organic polymer fiber has the best thermal stability and flame retardancy. In addition, PBO fiber has creep, chemical stability, , Excellent cutting / friction resistance, low water absorption rate, and excellent dimensional stability against humidity.

The carbon fiber is excellent in elastic modulus and tensile strength and excellent in energy absorption ability, and plays a role of suppressing the generation of large-sized cracks. The carbon fibers are preferably added in a length of 30 to 40 mm.

The cellulose fiber is specially processed to have a hydroxyl (OH) on the surface of the cellulose fiber extracted from wood having excellent freeze resistance, strength, toughness and rigidity, thereby promoting dispersion and adhesion in concrete, (About 0.115 cm3 / g) and the number of fibers per unit volume (about 1100 pieces / cm3), so that microcracks are suppressed in the soil concrete Stabilized, and exhibits properties such as increasing durability and flexural toughness of soil concrete due to crosslinking action of fibers and high tensile strength, and increasing resistance to fatigue load and cyclic loading.

The eco-friendly soil concrete composition according to the present invention does not use cement, so it has an advantage of being excellent not only in compressive strength but also in permeability, while preventing heavy metal pollution harmful to the environment.

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.

50 parts by weight of aggregate, 15 parts by weight of fire-fighting agent, 20 parts by weight of adhesive and 10 parts by weight of loess powder were mixed with 100 parts by weight of soil to prepare an eco-friendly soil concrete composition. The soil used was a Masato having a particle size range of 2 to 6 mm. The aggregate having a diameter of 6 to 13 mm was used. The sludge was prepared by mixing 30 wt% of purified water sludge dry powder, 15 wt% of granite sludge, 10 wt% of polysilicon sludge, 25 wt% of blast furnace slag, 10 wt% of lime, 5 wt% of gypsum and 5 wt% Respectively. The rice husk ash was produced by burning rice hulls at a temperature of 650 ° C and pulverizing them to an average particle size of 100 to 200 μm. The adhesive is composed of 30 wt% of amorphous calcium aluminate, 10 wt% of sodium aluminate, 10 wt% of polyester polyol, 5 wt% of isocyanate, 10 wt% of potassium methyl siliconeate, 11 wt% of silicon dioxide, 15% by weight of ethylene-vinyl acetate and 3% by weight of toluene diisocyanate trimer were stirred at 40 占 폚 for 1 hour. The yellow loess was fired at 850 ° C for 5 hours, cooled, and pulverized.

An eco-friendly soil concrete composition was prepared in the same manner as in Example 1, except that 10 parts by weight of the strength-increasing agent was further added to 100 parts by weight of the soil. The strength enhancer may be selected from the group consisting of 30 wt.% Of red shale, 20 wt.% Of activated carbon, 15 wt.% Of bentonite, 10 wt.% Of elvanite, 7 wt.% Of Ililite, 5 wt.% Of lead oxide, 4 wt.% Of dolomite, % And 2% by weight of tourmaline.

An eco-friendly soil concrete composition was prepared in the same manner as in Example 1 except that 10 parts by weight of the strength-increasing agent and 6 parts by weight of the fiber reinforcing agent were added to 100 parts by weight of the soil. The strength enhancer used in Example 2 was used in the same manner. The fiber reinforcing material was prepared by mixing 50 wt% of PBO fibers, 30 wt% of carbon fibers, and 20 wt% of cellulose fibers.

[Comparative Example 1]

20 parts by weight of titanium dioxide, 8 parts by weight of colloidal silica, 150 parts by weight of water, 230 parts by weight of ordinary Portland cement, 230 parts by weight of white cement, 770 parts by weight of sand, 1052 parts by weight of gravel and 5.52 parts by weight of an admixture, 2 parts by weight of loess, 3 parts by weight of a silane coupling agent, 4 parts by weight of an ionic block copolymer and 1 part by weight of fumed silica were blended and solidified to prepare pale earthy color earth concrete

[Experimental Example 1]

The compressive strengths of the soil concrete compositions prepared in Examples 1, 2, 3 and Comparative Example 1 were measured. The compressive strength was measured by ages of 28 days according to the standard of KS F2405. 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 of the compressive strength measurement are shown in Table 1 below.

Compressive strength (kgf / ㎠) Example 1 540 Example 2 565 Example 3 585 Comparative Example 1 520

Table 1 shows that although the eco-friendly soil concrete compositions of Examples 1 to 3 contain no cement, the compressive strength of the earthen concrete composition is superior to that of the soil concrete composition of Comparative Example 1, which includes cement.

[Experimental Example 2]

The permeability coefficients of the soil concrete compositions prepared in Examples 1, 2 and 3 and Comparative Example 1 were measured and shown in Table 2

Test Items unit Test Methods Test result Remarks Example 1
Permeability coefficient
Mm / s
KS F 4419: 2014 8.6 (20 ± 5) ° C.,
(35 ± 10)%
RH Example 2 8.4 Example 3 8.1 Comparative Example 1 1.8

Table 2 shows that the eco-friendly soil concrete compositions of Examples 1 to 3 are superior to the soil concrete compositions of Comparative Example 1 in water permeability.

The eco-friendly soil concrete composition according to the present invention does not use cement, so it has an advantage of not only preventing the heavy metal pollution harmful to environment but also having excellent permeability as well as compressive strength.

Claims (5)

40 to 50 parts by weight of an aggregate, 10 to 15 parts by weight of an aggregate, 15 to 20 parts by weight of an adhesive, and 6 to 10 parts by weight of a loess powder, based on 100 parts by weight of the soil,
The solidifying sludge comprises 30 to 40 wt% of purified water sludge, 10 to 15 wt% of granite sludge, 6 to 10 wt% of polysilicon sludge, 20 to 30 wt% of blast furnace slag, 6 to 10 wt% of lime, By weight and 1 to 5% by weight of rice flour.
Environmentally friendly soil concrete composition.
delete The method according to claim 1,
Wherein the adhesive comprises 30 to 40 wt% of amorphous calcium aluminate, 6 to 10 wt% of sodium aluminate, 6 to 10 wt% of polyester polyol, 3 to 5 wt% of isocyanate, 6 to 10 wt% of potassium methyl silicate, 11 to 15 weight percent aluminum oxide, 6 to 10 weight percent aluminum oxide, 11 to 15 weight percent ethylene-vinyl acetate, and 1 to 5 weight percent toluene diisocyanate trimmer.
Environmentally friendly soil concrete composition.
The method according to claim 1,
Further comprising 6 to 10 parts by weight of a strength-enhancing material based on 100 parts by weight of the soil,
The strength enhancer may be selected from the group consisting of 30 wt.% Of red shale, 20 wt.% Of activated carbon, 15 wt.% Of bentonite, 10 wt.% Of elvanite, 7 wt.% Of dilite, 5 wt.% Of lead oxide, 4 wt.% Of dolomite, % ≪ / RTI > and tourmaline 2%
Environmentally friendly soil concrete composition.
The method according to claim 1,
Further comprising 6 to 10 parts by weight of a fiber reinforcing material per 100 parts by weight of the soil,
Wherein the fiber reinforcement comprises 50% by weight of PBO fibers, 30% by weight of carbon fibers and 20% by weight of cellulose fibers.
Environmentally friendly soil concrete composition.