KR19990073093A - method for manufacturing fluid soil concrete and composition of fluid soil concrete - Google Patents

Abstract

The present invention has the soil properties as a main component, while having the strength characteristics, durability, fire resistance, workability, etc. required for the existing concrete evenly by the soil as a main component of the fluidity that can produce a variety of natural textures according to the unique color of the soil It relates to soil concrete. Flowable soil concrete according to the present invention is a soil (viscous clay, sandy soil) 400 ~ 1,000 kg / ㎥, cement 80 ~ 200 kg / ㎥, moisture absorption admixture 200 ~ 500 kg / ㎥, fine aggregate (sand) 300 ~ 800 kg / ㎥, Coarse aggregate 400 to 900 kg / m 3, water 200 to 400 kg / m 3, performance improving admixture (reducing agent, coarse agent, thickener). In the present invention, the soil is first mixed with the hygroscopic admixture to be powdered by the crusher in a state where the moisture of the soil is partially absorbed by the admixture.

The flowable soil concrete according to the present invention can be used together with reinforcing fibers or reinforcing wire mesh in the field installation, thereby reducing initial shrinkage and improving strength characteristics in the long term. By using flowable concrete according to the present invention, concrete is provided which is more environmentally friendly and has a natural texture and color.

Description

Method for manufacturing fluid soil concrete and composition of fluid soil concrete

The present invention relates to a method for producing a fluidized soy concrete and its composition, which has the strength characteristics, durability, fire resistance and the like required for existing concrete as a main ingredient, which can be easily obtained anytime and anywhere.

Conventional concrete has the advantage that it is easy to obtain the strength required while having good durability and fire resistance, and also has the advantage of good workability and relatively inexpensive, and also can easily obtain aggregates and the like, and has been widely used until now.

Today, except for concrete, it is impossible to explain the living environment itself. However, the color is uniform with gray one-sided, which gives a modern impression to people with various tastes, so it is often incompatible with nature or the surrounding environment. Even if the pigment is mixed and the color is diversified, the artificial texture is felt and the cost is greatly increased. In concrete, the tensile strength is about 1/10 of the compressive strength and the flexural strength is about 1/7 to 1/8 of the compressive strength, and the unbalance between the flexural strength and the tensile strength is too severe compared to the compressive strength. Most structures are designed based on the flexural strength, and there is a problem that the dependence of the reinforcement is too high.

Therefore, the present invention is to solve the problems of the existing concrete as described above, while retaining the advantages of the concrete (strength characteristics, durability, fire resistance, workability, cost) while maintaining the soil as a main component By producing various natural colors and textures according to the unique colors, it is a more natural and environmentally friendly concrete and provides a flexible soil concrete with a flexural strength of 1/4 to 1/5 of the compressive strength due to the ductility of the soil. In addition, slag, lime-based inorganic materials, fly ash, acryl, etc. can be widely used according to the purpose of use, and thus the choice is widened, and the purpose is to provide a liquid soy concrete useful in terms of practicality and long-term compatibility.

1 is a block diagram of a flowable concrete concrete according to the present invention.

Figure 2 is a block diagram showing a manufacturing process of the flowable soil concrete according to the present invention.

3 is a block diagram showing the construction sequence of the flowable soil concrete according to the present invention.

In order to achieve the above object, the flowable soil concrete of the present invention is a soil (viscous clay, sandy soil) 400 ~ 1,000 kg / ㎥, cement 80 ~ 200 kg / ㎥, moisture absorption admixture 200 ~ 500 kg / ㎥, fine aggregate (sand ) 300 ~ 800kg / ㎥, coarse aggregate 400 ~ 900kg / ㎥, water 200 ~ 400 kg / ㎥, performance improvement admixture (resining agent, crude agent, thickener) and the like. Units of kg / m 3 in the above and below (including claims) are described in units indicating the weight of each constituent composition per unit volume (m 3) of final flowable soil concrete.

The hygroscopic admixture in the constitution may be selected from blast furnace slag, lime series, such as slaked lime or fly ash, as an element that contributes to powdering the soil by absorbing moisture in the nursing. It is preferable to mix the soil in natural wet state with the admixture first, and to completely powder the mixture with a specific surface area of 500 cm 2 / g or more in the state where the moisture of the admixture is inhaled by the admixture. It is preferable to spray the water-soluble acrylic 20-40kg / a on the surface to increase the wear resistance.

Hereinafter, the manufacturing process of the flowable concrete concrete according to the present invention.

(First process)

Process of crushing by mixing soil and moisture admixture.

The flowable soil concrete according to the present invention is a natural soil whose main component is not easily collected from the surroundings but from cement. In general, the soil collected in the natural state is a wet material and contains a lot of agglomerated parts, so that it is impossible to homogeneously mix with cement or slag powder. Therefore, a separate process for homogeneous mixing as a composition state before the hydrolysis is required. After collecting soil in the natural state, remove gravel and dirt, and put it into the hopper with equipment, and mix the soil coming out of the hopper with a certain ratio and the moisture absorption admixture coming out of the other hopper. After inhalation, the mixture is placed in a crusher, pulverized into a complete powder state, and mixed until uniformly mixed.

Generally, sandy soil particles are larger and harder than viscous soil particles, but the basic characteristics of powder are similar. In this process, primary mixing of the admixture and soil occurs, and the mixture is ground and agitated by crushing to obtain a homogeneously homogeneous soil mixture. Through this process, the soil can be easily mixed with the binder such as cement by removing the contained moisture and making it as granular as possible without performing a separate heating process.

As the moisture absorption admixture, the blast furnace slag is preferable, and instead of the blast furnace slag, a lime-based inorganic material, a fly ash, or the like may be used. Since blast furnace slag is generally distributed in the market, it is easy to purchase. The higher the degree of powder, the better, but more than 4,000 cm 2 / g. Actually, the blast furnace slag powder on the market is about 4,400 cm 2 / g.

Soil is preferably clay or sandy soil which contains organic matter or excludes reactive soil. Soils of sandy soils are better than viscous soils for strength, but viscous soils are advantageous for expressing the texture and color of soils.

The mixing ratio of soil (viscosity clay or sandy soil) and admixtures collected in the natural state is preferably 200-500 kg / ㎥ of admixtures relative to 400-1,000 kg / m3 of soil (viscous clays and sandy soils).

(Second process)

Compounding process.

According to the first process, the soil moisture is appropriately reduced by mixing the soil and the hygroscopic admixture, and the material is discharged into a mixer in the state where the particles of the soil are powdered, and mixed with cement, fine aggregate, and coarse aggregate. The blended water is sprayed from the outlet after mixing is complete. When the blended water is mixed together, the powder in the form of particles combines first, and smooth mixing is impossible. If necessary, a mixed material for improving performance can be added.

Cement is a solidified material that allows the constructed soil concrete to have a certain mechanical strength and durability. Cement is mixed when 400 to 1,000 kg / m3 of soil (viscous and sandy soils) and 200 to 500 kg / m3 of admixtures are mixed. Is preferably mixed at a ratio of 80 to 200 kg / m 3, fine aggregate (sand) 300 to 800 kg / m 3, coarse aggregate 400 to 900 kg / m 3, and water 200 to 400 kg / m 3. Cement uses KSL 5201 ordinary portland cement, which does not exceed about 9% of its total weight. When the amount of cement exceeds 9%, the natural color of the soil is damaged and the whitening phenomenon is intensified. However, when the amount of cement is used too much, not only the problem of strength develops but also the initial strength is delayed and the crack due to shrinkage increases.

Additions as admixtures for improving performance are water reducing agents, thickeners and thickeners. In the flowable soil concrete according to the present invention, the unit quantity is also increased as the surface area of the soil in the composition increases, so that the use of a water reducing agent is inevitable. The water reducing agent generally uses high performance melamine-based resin and adds about 1 to 3% of the weight of the binder excluding soil. The thickener is preferably 0.05 to 0.3% of the weight of the binder excluding soil, and the crude agent is 0.5 to 1% of the weight of the binder. Admixtures may be added to the blended water when mixing, but may be incorporated into the mixer truck when they are transported to the site when they are far away. This performance-improving admixture is mounted on a mixer truck with a dry beam and mixed with water when the transport distance exceeds 1 hour when transporting a mixture of soil, moisture absorption admixture, cement and aggregate to the mixer. It can also be used.

Fine aggregates and coarse aggregates are generally acceptable if they are of the quality used for concrete. The fine aggregate is advantageously more than the medium sand (medium) rather than fine yarn (sa) in order to increase the surface wear resistance, the size of the thick aggregate is preferably within 1/5 of the thickness of the surface layer.

(Third process)

Spot casting and surface leveling process

A predetermined amount of compounding water is added to the mixture of soil, admixture, cement, and aggregate prepared by the above-described process and placed on the road surface to be poured. It is desirable to use reinforcing fibers or reinforcing wire mesh to reduce initial shrinkage and enhance strength characteristics in the long term. The flowable soil concrete according to the present invention has a very high viscosity compared to the existing large concrete paste, so it is difficult to select a finishing surface. Therefore, it is effective to do the surface treatment with plastering.

(Fourth process)

Surface addition process

This process is an additional process that can be selectively carried out when higher quality is required. After the third process, 10 ~ 30 kg / m3 of water-soluble acrylic is finished, and then coated on the surface or when forming a fluid concrete paste. It may be added by mixing.

1 is a cross-sectional configuration of the voltage-type soil concrete according to the present invention soil (4), cement (3), blast furnace slag (5), fine aggregate (sand) collected in a natural state through the same process as the rock described above ( 2), coarse aggregate (gravel) (1) and the like as the main constituent, and the compounded water (water), admixture (adjuvant) and the like are formulated. As can be seen from the diagram, voltage-type soil concrete has increased abrasion resistance by adding fine aggregate and coarse aggregate compared to the conventional soil-cement method, and slag and lime having a large part of the binder having minimal influence on the color and texture of the soil. Family, fly ash, etc. The reason why the cement is not more than 9% of the total weight is that it takes into account that the natural color of the soil is damaged and the bleaching is intensified when more than 9%.

The following table is a comparison of various embodiments shown by varying the compounding ratio of each component of the present invention, including the respective components as described above, the unit is kg, and the case where the voltage of all 30kg / ㎠. Intensity measurement is performed after curing under curing conditions of 95% relative humidity and 23 ℃ temperature, soaked in water one day before measurement, and removed from water to remove water.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 soil Viscous soil 600 Sandy Soil 600 Viscous soil 600 Sandy Soil 600 Viscous soil 600 Sandy Soil 600 Viscous soil 600 Binder 1 Cement 150 Cement 150 Cement 150 Cement 150 Cement 150 Cement 150 Cement 150 Binder 2 Slag350 Slag350 Slag350 Slag350 Slaked lime350 Slaked lime350 Fly Ash350 Binder 3 Acrylic 15 Acrylic 15 Fine aggregate Sand 400 Sand 400 Sand 400 Sand 400 Sand 400 Sand 400 Sand 400 Coarse aggregate Sleeping gal600 Sleeping gal600 Sleeping gal600 Sleeping gal600 Sleeping gal600 Sleeping gal600 Sleeping gal600 Formulation water Water350 Water350 Water350 Water350 Water350 Water350 Water350 Water reducing agent High Fluidizing Agent 10 High Fluidizing Agent 10 High Fluidizing Agent 10 High Fluidizing Agent 10 High Fluidizer 10 High Fluidizing Agent 10 High Fluidizing Agent 10 Thickener Powder type 1 Powder type 1 Powder type 1 Powder type 1 Powder type 1 Powder type 1 Powder type 1 Pushing strength kg / ㎠ 235 288 240 285 188 222 161 Flexural StrengthN / ㎠ 493 608 505 619 351 415 308

As shown in Examples 3 and 4, the use of acrylic does not have a significant effect on strength. However, the color is distinct and the surface is shiny and has a luxurious texture.

As a result of using lime in Examples 5 and 6, the initial strength was higher than when slag was used, but it was disadvantageous in long-term strength. But the color is softer than when using slag. In Example 7, the strength was significantly reduced but the color was softer than slag.

The flowable soy concrete manufacturing process of the present invention consisting of the above components is carried out on the line of the sequence as shown in FIG.

The flowable soil concrete produced through such mixing and mixing process has almost the same strength characteristics, durability, fire resistance, and workability as existing concrete, but has a texture and color of soil, and thus can be used for various purposes. First of all, it is possible to adapt to the surrounding landscape by replacing concrete with natural construction or civil structure, and it can be used for landscape paving or natural paving by expressing the natural beauty of soil by replacing concrete in road paving.

As described in detail above, when constructed with a flowable concrete concrete according to the present invention has the following advantages and effects.

First, it is possible to create a more environmentally friendly and natural environment by varying the concrete color of the existing gray unilateral road with the natural texture and color of the soil.

Second, it can be used as a substitute for concrete aggregate by using the soil as a main component that can be easily collected from the surrounding.

Third, not only has low heat absorption, but also has low thermal conductivity, so it has excellent heat insulation effect in the heat and cold seasons. In addition, when used as a packaging material can reduce the temperature of the surface of the pavement can give comfort to pedestrians.

Fourth, it is very advantageous in terms of long-term compatibility because resistance to freezing, melting, and softening due to penetration is superior to that of the conventional simple soil cement method.

Fifth, the wastewater is returned to the natural state through the weathering process over time, thereby reducing the problem of disposal cost and environmental pollution due to the existing large concrete waste.

Claims (7)

Viscous or sandy soils collected in natural state 400 ~ 1,000 kg / ㎥, hygroscopic admixture 200 ~ 500 kg / ㎥, cement 80 ~ 200 kg / ㎥, fine aggregate (sand) 300 ~ 800kg / ㎥, coarse aggregate 400 ~ 900kg / ㎥ , Soil concrete composition characterized in that it comprises water 200 ~ 400kg / ㎥ and a predetermined amount of the performance improving admixture The method of claim 1, Improved performance admixture is weight% of the remaining mixture excluding soil, which is 1 to 3 weight% of melamine-based water reducing agent, 0.05 to 0.3 weight% of thickener, and 0.5 to 1 weight% of crude agent The method according to claim 1 or 2, Hygroscopic admixture is blast furnace slag, calcined lime or fly ash any one of the flowable concrete composition 400 to 1,000 kg / m3 of clay or sandy soils from which natural gravel and dirt are removed are put into the hopper, and the powder of clay or sandy soil coming out of the hopper at a constant rate from other hoppers is also absorbed more than 4,000 ㎠ / g Mixing with 200 to 500 kg / m3 of admixtures for the mixture to cause the admixture to inhale viscous or sandy soils, and then mixing the mixture into a crusher to pulverize the powder; Adding cement 80 to 200 kg / m 3, fine aggregate 300 to 800 kg / m 3, coarse aggregate 400 to 900 kg / m 3, and water 200 to 400 kg / m 3 to form a soil concrete paste; And, The process of laying and surface finishing the surface of the soil concrete paste Flowable Soil Concrete Manufacturing Method characterized in that comprises a The method of claim 4, wherein The hygroscopic admixture is blast furnace slag, slaked lime or fly ash any one of the manufacturing method of the fluid concrete concrete. The method according to claim 4 or 5, 10-30 kg / m 3 of water-soluble acrylic is added to the soil concrete mixture or sprayed on the surface finished surface to improve the wear resistance, characterized in that the flowable soil concrete composition. The method according to claim 4 or 5, Reinforced fiber or reinforced wire mesh manufacturing method characterized in that the reinforcing fiber or reinforcing wire mesh is inserted into the flowable soil concrete to be poured.