KR20080106143A - Composition for solidifying soils and industrial wastes - Google Patents

Abstract

An aging composition of industrial waste and soil is provided manufacture a solidification having property usable to a building stone alternative by being used for soil, industrial waste or a mixture thereof. An aging composition of industrial waste and soil comprises straight asphalt 16~24 weight%, emulsifier for an asphalt 0.06~0.10 weight%, light-oil, heavy oil or a mixture of 0.8~1.2 weight%, calcium chloride of 0.01~0.03 weight%, lignin of 0.8~1.2 weight%, acrylic emulsion system asphalt modifier of 0.7~1.3 weight%, an NaOH of 0.13~0.21 weight%, an oleic acid of 0.22~0.34 weight% and water having a remaining amount.

Description

Composition for solidifying soils and industrial wastes

The present invention relates to a solidified composition of soil and industrial waste, and more particularly, containing straight asphalt as a main component, and earth and slag such as granite, Ito, river sand, and sea sand, slag, waste concrete, and sludge. The present invention relates to a solidified composition of soil and industrial waste which can be added to a single or a mixture of industrial waste such as a small amount of cement and form solidified soil and industrial waste having properties usable as a substitute for stone.

Recently, the construction period is delayed due to the difficulty of securing high quality construction materials during the civil works and construction projects, and it is a factor that increases the cost.The natural environment is developed by developing quarries to collect construction materials or collecting aggregates from rivers and seas. It is damaging and disrupting ecosystems. Specifically, the existing port reclamation method, the existing asphalt and concrete pavement method, etc., because the use of granular materials such as stone is damaging the field for quarrying, quarrying, transportation, and breaking work is a factor that increases the construction cost. In addition, most riverbank dike construction methods use general earth and sand, so the dike collapses due to lack of durability and safety due to the scour caused by the pressure of the water, which causes flooding and spreads disease, and improves existing soft ground. In the case of the construction method, the construction cost was high and the loss rate of the used materials was large.

Therefore, in order to solve these problems, there has been a demand for a method for recycling soil and industrial waste widely distributed throughout Korea as a substitute for stone in various civil works and other construction projects.

As such a method, cement stabilization, Lignin Rosin Asphalt Concrete (LAC), etc. have been developed and utilized in the past, but it is difficult to obtain early compressive strength due to long finishing curing time, and compressive strength is also less than 100 kgf / cm 2. As the field that can be used is limited to the auxiliary base materials of road construction, its utilization was very low.

In another method, Korean Patent Publication No. 1996-29280 discloses a method of curing industrial waste and soil mixtures using a curing agent composition. The curing agent composition used is composed of 25% sodium carbonate, 25% copper chloride, 15% magnesium carbonate, 10% ammonium chloride, 8% silicate silicate, 7% silicate, 5% iron sulfate and 5% titanium oxide. Although this curing agent is described as a composition suitable for solidifying a mixture of industrial waste and soil, the production cost is high by using sodium carbonate and copper chloride as the main components, and the strength of the solid produced by using the same is not greatly improved. There is a need for developing a hardener that can further improve strength.

As described above, the stone has a wide range of uses such as port and coast, road and airport, water resource development, soil, and civil engineering, but the resources are limited. There has been an urgent need for a way to recycle industrial waste and granite soil.

In accordance with these requirements, the inventors of the present invention issued on August 2, 2005, in Korean Patent Application No. 2005-0070705, 25 to 35% by weight of emulsified asphalt, 0.05 to 0.20% by weight of asphalt emulsifier, 0.1 to 0.3% by weight of hydrochloric acid, 0.01 to 0.01% of calcium chloride. A solidifying composition containing 0.05% by weight, 0.1% to 0.5% by weight of lignin, 0.01% to 0.05% by weight of oleic acid, 0.005% to 0.030% by weight of surfactant, and the remaining amount has been applied. However, this composition has a problem in that the cost of producing the composition is high by using emulsified asphalt, and the ability to cope with impact and flexibility is rather weak.

The inventors of the present invention have conducted research on solidifying compositions that can solve the conventional problems by using a straight asphalt as a main raw material among various petroleum asphalt, and as a result, the solidified composition of the present invention is used for earth and sand, industrial waste or When the mixture is mixed with a small amount of cement to produce a solid, the density, strength and elasticity are increased, the durability is excellent, and the curing speed is shortened, so that it can be used as a building material, civil engineering material, etc. as a substitute for stone and The present invention has been found to be capable of producing industrial waste solids.

It is an object of the present invention to provide a hardening or solidifying composition of soil and industrial waste which contains straight asphalt as a main raw material and can be used in soil, industrial waste or mixtures thereof to produce solids having physical properties usable as stone substitutes. will be.

In order to achieve this purpose, the solidification composition of the earth and industrial waste of the present invention is 16 to 24% by weight of straight asphalt, 0.06 to 0.10% by weight of emulsifier for asphalt, 0.8 to 1.2% by weight of light oil, heavy oil or a mixture thereof, calcium chloride 0.01 It is characterized by containing water as -0.03% by weight, lignin 0.8-1.2% by weight, acrylic emulsion-based asphalt modifier 0.7-1.3% by weight, sodium hydroxide 0.13-0.21% by weight, oleic acid 0.22-0.34% by weight and the balance.

In addition, the acrylic emulsion-based asphalt modifier is characterized in that the styrene butadiene styrene block copolymer (SBS Block Copolymer).

In addition, the solidified composition of the soil and industrial waste of the present invention is characterized in that the dilution of 3 to 5 times of the solidified composition configured to further contain 200 to 400 parts by weight of water with respect to 100 parts by weight of the solidified composition.

As can be seen from the above, the solidified composition according to the present invention can be used as is straight asphalt produced in Korea, excellent storage stability is possible long-term storage, it is also excellent waterproof. In addition, the solidified body of the soil and industrial waste formed by using the solidification composition of the present invention has excellent density, strength, elasticity and durability can be used as a stone substitute, and because the external impact or pressure is absorbed inside the asphalt to alleviate It can be easily utilized in hot and humid areas.

Hereinafter, the present invention will be described in more detail.

Solidification composition of the soil and industrial waste according to the present invention is an essential component as straight asphalt; Emulsifiers for asphalt; Light oil, heavy oil or mixtures thereof; Calcium chloride; Lignin; Acrylic emulsion-based asphalt modifiers; Sodium hydroxide; It is configured to contain oleic acid and water, giving effective strength to earth and industrial wastes and preventing cracks due to dry shrinkage.

In general, Petroleum Asphalt is obtained in the process of manufacturing petroleum products such as petroleum refining. Straight asphalt, asphalt cement, cutback asphalt, emulsified asphalt, blown ( Blown) asphalt, modified asphalt, and the like can be classified. Among these, straight asphalt is the heaviest oil contained in crude oil. It is a residue obtained by distillation under high vacuum through a vacuum distillation apparatus to completely remove hard components. It has a high elongation and adhesive strength, and has a softening point. (軟化 點) is 65 degrees C or less normally. It is mainly used for road paving and airport paving. Since the straight asphalt is being shipped by domestic asphalt producers as products such as AP-3 and AP-5, it can be used as it is without further processing, thereby reducing manufacturing costs. Straight asphalt in the present invention increases the elasticity and stability of the mixed particles consisting of soil or industrial waste, cement and hardener and serves as a surface waterproofing. If it is contained in an amount of less than 16% by weight, there may be a problem that lack of stability and adhesion due to the decrease in elasticity between particles, when contained in an amount of more than 24% by weight increases the product cost and cause a decrease in strength Since there may be a problem, it is contained in an amount of 16 to 24% by weight relative to the total weight of the solidified composition.

Emulsifiers for asphalt have good degradability due to high emulsification and are used as mixing asphalt emulsions, and any of cationic or nonionic emulsifiers can be used. If it is contained in an amount of less than 0.06% by weight may have a problem that can not emulsify asphalt, etc., if contained in an amount of more than 0.10% by weight may increase the product cost and there is a problem that the emulsification function is rather reduced, It is contained in the amount of 0.06 to 0.10% by weight relative to the total weight of the solidified composition.

Light oil, heavy oil, or mixtures thereof are used to solve the phenomenon that when straight asphalt is used as it is, it is low invasiveness and easily solidified at room temperature, making it very difficult to emulsify. There may be a problem that is not easy, and if contained in an amount of more than 1.2% by weight there may be a problem that does not solidify prematurely. Therefore, it is contained in the amount of 0.8-1.2 weight% with respect to the total weight of the solidification composition.

Calcium chloride mixes with cement to act as a catalyst to promote absorption and prevent freezing. If it is contained in an amount of less than 0.01% by weight it may not have a smooth reception with water, there is a problem that the freeze-preventing effect is weak, and when it is contained in an amount of more than 0.03% by weight an amount of anhydride generates a solidifying agent Since there may be a problem difficult to achieve, it is contained in an amount of 0.01 to 0.03% by weight relative to the total weight of the solidified composition.

Lignin plays a role in dispersing mixtures of soil, industrial waste, and cement, and increases strength by combining cements and mixtures. If it is contained in an amount of less than 0.8% by weight may inhibit the particle dispersion and may reduce the strength after completion of the material, when contained in an amount of more than 1.2% by weight due to the nature of the material three-dimensional network structure of other materials Since there may be a problem that inhibits the chemical reaction, it is contained in an amount of 0.8 to 1.2% by weight relative to the total weight of the solidified composition.

Acrylic emulsion-based asphalt modifiers disperse and distribute fine particles and have excellent adhesion and are used for adhesion between particles. Waterproof effect is also excellent. If it is contained in an amount of less than 0.7% by weight may be a problem that can not emulsify asphalt, etc. If contained in an amount of more than 1.3% by weight it helps to improve adhesion but increases the product cost, so as to the total weight of the solidified composition It is contained in an amount of 0.7 to 1.3% by weight. More preferably, it is a styrene butadiene styrene block copolymer (SBS Block Copolymer). For example, butanol (Butonal NS 198; manufactured by BASF, USA) and the like can be used.

Sodium hydroxide decomposes organic matter, absorbs moisture and carbon dioxide from the atmosphere, and becomes sodium carbonate to control the concentration of the emulsion and to regulate pH. When contained in an amount of less than 0.13% by weight, the concentration and viscosity of the emulsion may be lowered and become strong acidic or strong base, and when contained in an amount of more than 0.21% by weight, the concentration and viscosity of the emulsion may be reduced and strong acidic or strong basic Since it can be and become an environmental inhibitor, it is contained in an amount of 0.13 to 0.21% by weight relative to the total weight of the solidified composition.

Oleic acid is a kind of fatty acid surfactant and is used as an emulsifier. The oleic acid is used as an emulsifier, so that other substances are easily absorbed by the mixed particles, penetrate the inner surface of the mixed particles to improve waterproofness and reduce solidification at freezing temperatures. If it is contained in an amount of less than 0.22% by weight may have a problem that the waterproofness is lowered, and when contained in an amount of more than 0.34% by weight may have a problem of forming a float, 0.22 ~ 0.34 relative to the total weight of the solidified composition It is contained in an amount of% by weight.

Water is contained to accommodate the moisture content and to account for the remaining amount excluding the above components. If too little water is contained, there may be a problem that the emulsion dispersion does not occur properly. If too much water is present, there may be a problem that the adhesion between the mixture particles, water resistance and strength is reduced, so that the water content is also adjusted to a suitable range shall. Most preferably, it is contained in an amount of about 70 to 80% by weight relative to the total weight of the solidified composition.

Conventional solidified compositions using emulsified asphalt have a somewhat poor ability to cope with impact or flexibility, whereas the solidified compositions of the present invention use straight asphalt having a lower penetration than emulsified asphalt, and use diesel, heavy oil or mixtures thereof. It was used to emulsify directly to increase the penetration. In addition, the solidification composition of the present invention by using sodium hydroxide instead of the conventional surfactant to improve the decomposition ability of the organic material to assist the emulsification stably. In addition, by adding an acrylic emulsion-based asphalt modifier, abrasion resistance, impact resistance, flexibility, low stress, release property, heat resistance, and weather resistance were improved.

The solidifying composition of the present invention may be prepared by mixing the above components, and may also be prepared in a diluted form to a predetermined concentration by further adding water. In particular, the solidification composition of the present invention may be prepared in a 3 to 5 times dilution of the solidification composition configured to further contain 200 to 400 parts by weight of water based on 100 parts by weight of the solidification composition prepared to have the composition. In this case, it is possible to add to the soil and industrial waste and cement as it is without diluting by adding water separately during the manufacture of the solid.

The solidified composition of the present invention prepared by mixing the above components is added with a small amount of cement and serves to solidify the soil and industrial waste, and as the soil, granite, Ito, river sand, sea sand, natural soil, etc. It can be used without limitation so long as it is classified as a general soil soil, including a single granite soil or a mixture of granite soil and other soil soil is most preferred. Industrial waste is generally used in the sense of unnecessary surplus generated in buildings or areas occupied by industry, and the management of waste is generally limited to solid waste including waste oil. It includes sludge, remnants, volcanic ash, environmental waste, etc., which occur along with it, and can be used without limitation as long as it is classified as a broad-based waste. Slag, powder slag, waste generated in a blast furnace can be used. Most preferred are single or mixtures of concrete, sludge, etc. which are discarded after beneficiation of various minerals. In the present invention, the soil and industrial waste may be used in a single or a mixture, respectively, a mixture of soil and industrial waste may also be used.

The solidified body prepared by adding the solidification composition of the present invention to a single or a mixture of soil or industrial waste and a small amount of cement has an increased density, strength and elasticity, excellent structural durability at high temperatures, and a hardening speed. It can be used as a substitute for civil engineering or construction.

<Test Example 1>

In order to evaluate the strength of the soil or industrial waste specimen prepared by mixing the solidification composition, the basic physical properties of granite, slag, powder slag, sludge and waste concrete used as representative samples in the following production examples The test was carried out according to the method, and the results are shown in Table 2 below. Representative samples were extracted in four fractions of each material brought into the laboratory for each test.

Basic properties Test Methods Water content KS F 2306 importance KS F 2308 Liquid limit KS F 2303 Firing limit KS F 2304 Granularity KS F 2302 Sieve analysis KS F 2309

sample Water content (W _n ) (unit:%) Specific gravity (G _s ) (unit: ton / ㎥) Liquid limit (LL) (%) Firing Limit (PI) (Unit:%) # 200 overpass (unit:%) Granularity (USCS) Granite soil 19.6 2.65 29.1 13.6 12.9 Sand Granulated Soil Slag 15.8 3.05 - - 0.60 - Slag slag 14.3 3.05 - - 7.52 - Sludge 16.4 3.01 - - 62.8 - Waste concrete 13.4 2.98 - - 2.07 -

Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in detail, this invention is not limited only to these examples.

<Examples 1-3 and Comparative Examples 1-4> Solidification Composition

In a separate storage tank, straight asphalt (AP-3; manufactured by SK Corporation, South Korea) or emulsified asphalt (AP-3; manufactured by Korea, Korea) were stored while maintaining a temperature of 130 ° C or higher. In another storage tank, emulsifiers for asphalt (Farmin ST-7; manufactured by Kao Corp., Japan), diesel, calcium chloride, lignin, acrylic emulsion-based asphalt modifiers (Butonal NS198; manufactured by BASF, USA), sodium hydroxide, oleic acid And each mixture of water was quantitatively mixed and stored while maintaining the temperature of 80 ℃. The asphalt and the mixture was put into a homogenizer and emulsified to prepare solidifying compositions of Examples and Comparative Examples. At this time, each component was added to the content of Table 3 below.

Ingredient (% by weight) Example Comparative example One 2 3 One 2 3 4 Straight asphalt 20.0 16.0 24.0 12.0 20.0 20.0 - Emulsified asphalt - - - - - - 20.0 Emulsifiers for Asphalt 0.08 0.06 0.10 0.08 0.08 0.08 0.08 Via 1.0 0.8 1.2 1.0 0.5 1.0 1.0 Calcium chloride 0.02 0.01 0.03 0.02 0.02 0.02 0.02 Lignin 1.0 0.8 1.2 1.0 1.0 1.0 1.0 Acrylic Emulsion Asphalt Modifier 1.0 0.8 1.2 1.0 1.0 0.5 1.0 Sodium hydroxide 0.17 0.13 0.21 0.17 0.17 0.17 0.17 Oleic acid 0.28 0.22 0.34 0.28 0.28 0.28 0.28 water Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount Remaining amount

Preparation Examples 1 to 7 and Comparative Preparation Examples 1 to 4

A 4-fold dilution of 300 parts by weight of water is prepared in advance with respect to 100 parts by weight of the solidification compositions of Examples 1 to 3 and Comparative Examples 1 to 4 prepared according to the composition and content of Table 3. After mixing Portland cement (Tongyang Cement Products) and dilution of the solidified composition prepared in advance in the composition of Table 4 and Table 5, each sample (soil or industrial waste) was put into a cylindrical steel mold having two seams on both sides. The specimens were chopped in three layers 25 to prepare specimens having a diameter of 50 mm and a height of 100 mm. At this time, no leakage or deformation occurred at the joint and the upper and lower ends, and mineral oil was applied to the inner surface of the mold so that it could be easily separated from the mold after curing. After this process, it was cured by immersion for 7 days. After the 7-day curing period was completed, the specimens were separated from the mold and polished so that the top and bottom ends were within 0.05 mm of the top view. The soil and industrial wastes used at this time were used as representative samples in Test Example 1.

Ingredient (unit: parts by weight) Production Example Comparative Production Example One 2 3 One 2 3 4 Dilutions of the Solidified Composition Example 1 4 - - - - - - Example 2 - 4 - - - - - Example 3 - - 4 - - - - Comparative Example 1 - - - 4 - - - Comparative Example 2 - - - - 4 - - Comparative Example 3 - - - - - 4 - Comparative Example 4 - - - - - - 4 cement Portland cement 10 10 10 10 10 10 10 Earth or industrial waste Granite soil 100 100 100 100 100 100 100

Ingredient (unit: parts by weight) Production Example 4 5 6 7 Dilutions of the Solidified Composition Example 1 4 4 4 4 Comparative Example 1 - - - - Comparative Example 2 - - - - Comparative Example 3 - - - - Comparative Example 4 - - - - cement Portland cement 10 10 10 10 Earth or industrial waste Slag 100 - - - Slag slag - 100 - - Waste concrete - - 100 - Sludge - - - 100

<Test Example 2>

After curing the specimens prepared in Preparation Examples 1 to 7 and Comparative Examples 1 to 4 respectively for 7 days and 28 days, the upper and lower compression surfaces of the rigid pressing plate of the tester were cleaned according to KS F 2405, and the central axis of the prepared specimen was The load was placed at a constant speed so as not to impact the specimen after placing it in the center. The compressive stress was increased to 2 ~ 3kgf / cm2 every second. After the specimen began to deform rapidly, the adjustment of the loading rate was stopped and the continual loading was applied to measure the uniaxial compressive strength. The results are shown in Table 6 below.

Uniaxial compressive strength (unit: kgf / ㎠) 7 days curing 28 days curing Preparation Example 1 158.41 250.28 Preparation Example 2 158.03 260.74 Preparation Example 3 162.22 259.55 Preparation Example 4 108.93 175.37 Preparation Example 5 100.85 168.41 Preparation Example 6 90.18 142.48 Preparation Example 7 68.34 118.22 Comparative Production Example 1 92.29 152.27 Comparative Production Example 2 100.34 159.54 Comparative Production Example 3 98.05 164.72 Comparative Production Example 4 91.38 146.20

As can be seen in Table 6, the compressive strength of the granite (manufacture examples 1 to 3) treated with the solidification composition of the present invention showed the highest overall, slag (preparation example 4), powder slag (preparation The compressive strength of Examples 5), waste concrete (Manufacture Example 6) and sludge (Manufacture Example 7) gradually decreased. In the case of Preparation Examples 1 to 3 using granite soil, the compressive strength was 28 kg or more at 28 days of curing. In addition, in the case of Production Examples 4 to 7 using slag, powdered slag, waste concrete, or sludge and only 10 parts by weight of cement was added, the minimum compressive strength was 28.00 kgf / cm 2 at 28 days of curing. On the other hand, the compressive strength of the granite soils (Comparative Examples 1 to 4) not treated with the solidification composition of the present invention was significantly lower than that of the granite soils (Comparative Examples 1 to 3) treated with the solidified composition of the present invention. .

The solidified composition having various strengths can be produced by controlling the curing period, the amount of cement and the solidified composition using the solidified composition of the present invention. For this reason, the solidified body formed using the solidification composition of this invention is applicable to various fields.

Although the specimens were prepared using only earth or industrial wastes as a preparation example of the present invention, the solids that can be formed using the solidification composition of the present invention are not limited to these examples, but the soil mixture, industrial waste mixture, and soil sand It is also applicable to the use of industrial waste mixtures.

Specifically, the solidification composition of the present invention is mixed with cement and soil, industrial waste or a mixture thereof to a predetermined composition, and then solidified and cured, and the shore substrate of the harbor and coastal sectors, roads and airports And it can be applied to the base of the auxiliary base, runway and aircraft transport path, and in the field of water resource development, it can be used for the construction and repair of river embankment, and the construction of earth and sand dam. In particular, in the case of earth and sand dam construction, it is possible to replace the past core wall with watertight mud, thereby preventing the environment from damaging the mud. In addition, it can be applied to soft ground substitution and improvement in soil and basic fields.

Industrial Applicability The present invention is used for producing a solidified composition of soil and industrial waste which can form solids of soil and industrial waste having physical properties that can be used as a substitute for stone.

Claims (1)

Straight asphalt 16-24% by weight, 0.06-0.10% by weight emulsifier for asphalt, 0.8-1.2% by weight of light oil, heavy oil or mixtures thereof, 0.01-0.03% by weight of calcium chloride, 0.8-1.2% by weight of lignin, acrylic emulsion-based asphalt modifier 0.7 -1.3% by weight, 0.13 to 0.21% by weight of sodium hydroxide, 0.22 to 0.34% by weight of oleic acid, and the residual amount, the solidification composition of the soil and industrial wastes.