KR100918102B1 - Soil solidifier and pavement method using the same - Google Patents

Abstract

A soil solidifier composition and a pavement method using the same are provided to secure excellent durability, flexural strength, compressive strength, freezing and thawing resistance and dry shrinkage reduction. A soil paving method using a soil solidifier comprises the following steps of: mixing soil, a soil solidifier and water to prepare a soil paving composition; primarily installing the soil paving composition and hardening it; trimming and planarizing the surface of the soil paving composition; installing an expansion joint for the prevention of crack; secondarily installing the soil paving composition and hardening it; coating a surface hardener on the surfaces of the soil paving composition; covering the soil paving composition with a curing blanket and curing it; and carrying out a construction joint for the prevention of crack.

Description

Soil solidifier and pavement method using the same

The present invention relates to a solid material composition for soil packaging and a soil paving method using the same, which is based on the strength of the soil itself to increase the plasticity limit by lowering the water content, ion exchange granulation, etc. The present invention relates to a soil solidifying composition having a durability and a soil paving method using the same.

In general, the pavement of the road is classified into a concrete pavement method, asphalt pavement method, a method to combine the masato and quicklime, and to compact the voltage. However, this is due to the change of temperature and precipitation according to the change of the four seasons, and the cracking occurs, and in summer, absorbing visible light of the sunlight to emit high-temperature radiant heat does not provide a comfortable environment for pedestrians and drivers, the radiant heat It is absorbed by greenhouse gases such as water vapor, carbon dioxide and methane and is the main culprit for the tropical nights, which are kept hot at night.

As a recent alternative for overcoming the problems associated with such concrete or asphalt pavement, a method of packaging with an environmentally friendly pavement composition such as soil has been proposed.

The soil emits far infrared rays beneficial to the human body, which promotes blood circulation and waste discharge, thereby improving health. And the soil releases anions, which adsorb and neutralize the cations released around the living environment from various pollutions, making the living environment comfortable. In addition, the soil is used as a road paving and building materials because of its excellent thermal insulation and insulation.

However, these soils are difficult to be molded into a certain form due to their own viscous or adhesive strength, and they are not easy to be used for construction because they have weaknesses and cracks during use due to their weakness and hardness. There was a limitation.

In order to solve the problem of using the soil as a packaging material or building material as described above, a method of mixing or stirring the solidified material in the soil, laying or molding is widely used.

Such solidified materials include a mixture of ceramic solidified materials for solidified soils in soil, and Korean Patent No. 2004-0099981 for mixing environmentally friendly rice straw and charcoal, salt and seaweed solids in soil. , Patent Publication No. 2005-0116769 for clay mortar packing method, which can be utilized for walking trails, sports facilities, bicycle paths, etc. Patent registration No. 0711115 for the clay composition to which the solidified material is added is widely used.

An object of the present invention is to minimize the amount of cement of Portland cement, the main material of cement-based fire extinguisher, to reduce the amount of poisons and dangerous goods, thereby preventing heavy metal contamination of the soil, and has a high durability for the earth packaging composition with excellent durability It is to provide a soil packaging method used.

Still another object of the present invention is to provide a soil packing solid composition and a soil paving method using the same, which can exert effective strength within a predetermined time while maintaining the soil's unique properties.

Another object of the present invention is to fill the gap between the large particles in the soil Calcium silicate hydrate, pozzolane reaction product, fine clay particles and unhydrated cement particles, such as bending strength, compressive strength and freeze-thawing resistance, reduction of dry shrinkage, etc. It is to provide a solid material composition for earth packing with excellent durability and earth packing method using the same.

Another object of the present invention is to increase the strength by the progress of the hydration reaction according to the addition of the solidified material, to provide a solid packing composition for soil packaging and soil packaging method using the same to improve the stable strength through the pozzolanic reaction during long-term age It is.

Soil packing composition according to the present invention is 30 to 45% by weight alumina cement, 20 to 35% by weight fine slag, 5 to 15% by weight Portland cement, 5 to 15% by weight expanding agent, 0.1 to 5% by weight glidant, sodium sulfate Or 1 to 5% by weight of alum, 1 to 5% by weight of pigment, 1 to 5% by weight of ocher, 0.1 to 5% by weight of thickener, and 0.1 to 5% by weight of fiber.

In addition, the present invention is to mix and stir 15 parts by weight of the solidified material composition and 12 to 14 parts by weight of water with respect to 100 parts by weight of soil.

As described above, the present invention is an inorganic solid material which minimizes the amount of cement, and is an environmentally friendly material in which heavy metals are not detected because it does not contain poisons or dangerous substances, and when it is added to soil such as masato, clay, and sandy soil, it has excellent bending strength. It has excellent durability, such as compressive strength, freeze thaw resistance and dry shrinkage reduction.

In addition, the present invention is a stable strength improvement by the progress of the hydration reaction and pozzolanic reaction during the mixing and laying of the soil and solidified composition.

In addition, the present invention, when mixing and laying the soil and solidified composition, filled the silicate hydrate, pozzolanic reaction product, fine clay particles and unhydrated cement particles in the space between the large particles in the soil, the interior having a complex gap structure The tissue is formed, thereby providing excellent durability.

In addition, since the solidified composition according to the present invention has alkalinity, the alkali component is slightly increased when mixed with soil (masato), but does not have a great influence on the vegetation environment, especially since local soil is acidic soil. It is beneficial to vegetation, and it has many effects such as to protect the underground ecosystem and improve the planting environment.

According to the present invention, 15 parts by weight of the solidification composition and 12 to 14 parts by weight of water are mixed and installed with respect to 100 parts by weight of soil, and the solidification composition is 30 to 45% by weight of alumina cement and 20 to 35% by weight of fine slag powder. , 5-15% by weight of Portland cement, 5-15% by weight of expanding agent, 0.1-5% by weight of fluidizing agent, 1-5% by weight of sodium sulfate or alum, 1-5% by weight of pigment, 1-5% by weight of yellow soil, 0.1 ~ 5% by weight of thickener 5 weight% and 0.1-5 weight% of fibers are included.

The alumina cement is to improve the early strength when mixing with the soil, when the mixed with the soil, forming ethrinite, adjusting the curing rate, and achieves the immobilization of heavy metals.

The slag fine powder is used by blast furnace slag, steelmaking slag, non-ferrous slag or a mixture of these, expressing the strength enhancing effect by the addition of fine slag powder, and has an ettrinite formation and curing rate control function.

The portland cement is added for strength enhancing effect and long-term strength enhancement, and is added to white portland cement or ordinary portland cement or a mixture thereof. This Portland cement also has a heavy metal immobilization function.

The expansion agent is added to reduce the dry shrinkage, type K (calcium silicate, gypsum, calcium oxide), type S (calcium aluminate, gypsum), M-type CaO-Al ₂ O ₃ -SO ₃ type expansion material (Alumina cement, gypsum) and type O (lime upon hydration of potassium hydroxide), which is a lime-based expansion material, is used. Such swelling agents form ethrinite and have a heavy metal immobilization function.

The fluidizing agent uses a lignin-based, naphthalene-based or melamine-based fluidizing agent, and when added in an amount of 0.1 to 5% by weight, improves the mixing efficiency of each material and ensures workability.

When sodium sulfate or alum is added in an amount of 1 to 5% by weight, it has a hydration promoting effect and strength enhancing effect.

The pigment is to give a visual stability to the pedestrian through a suitable color, and add a known or well-known pigment.

The ocher is added to the raw ocher or calcined ocher, and has a pH reducing effect, far infrared radiation effect, geothermal emission reduction effect and visual stability to pedestrians.

The thickener uses bentonite, cellulose or methylcellulose, and when added in an amount of 0.1 to 5% by weight, improves cohesion and moisture retention.

The fiber is added with nylon, polyvinyl acetate or polyester, and when added to 0.1 to 5% by weight, has a shrinkage reduction, crack suppression effect, densification of the package structure.

The soil packaging solidified composition according to the present invention made as described above has the chemical properties as shown in Table 1 below and the physical properties as shown in Table 2.

Table 1

Since SiO ₂ affects the durability of the solidified composition, Al ₂ O ₃ the curing rate, and CaO affects the durability and expandability of the solidified composition, the solidified composition according to the present invention has the analytical value (wt%) of [Table 1]. ) Must be satisfied. In addition, the ignition loss should be limited to less than 3.0wt% as a factor indicating the water content in the solidified composition, chloride chloride should be limited to less than 0.5wt% as a factor indicating the chloride content in the solidified composition.

[Table 2]

When the solidified composition according to the present invention made as described above is mixed with soil, water, and functional additives such as masato, clay, sandy soil, etc., the effective strength is expressed within a predetermined period, while maintaining the unique properties of the soil.

In more detail, the present invention is based on the strength of the soil itself, the lower the water content ratio by the addition of the solidified material composition (hereinafter referred to as 'E-CON'), the plastic limit is increased by the ion exchange granulation, etc. Improvements are made. As the hydration of E-CON proceeds, the strength is increased, and the Pozoran reaction occurs at an age of organs, and stable strength is improved. At this time, most of the strength improvement effect of the soil by E-CON is caused by the generation of hydrate in the E-CON.

The internal structure of the soil solidified by the addition of E-CON is composed of relatively large sand particles and silt particles, and the spacing between these particles is not limited to calcite silicate (3CaO · SiO ₂ · 3H ₂ O), pozzolanic reaction products, and fine particles. Filled by clay particles and unhydrated cement particles form internal structures with complex gap structures.

In addition, the high purity of the granules by the lime silicate hydrate is greatly influenced by the type of soil (specific surface area and particle size distribution) as well as the amount of the silicate lime hydrate determined by the addition rate of the solidified composition and the degree of hydration thereof.

E-CON according to the present invention is active in the production of alumina lactic acid lime hydrate (Ettringite: 3CaO, Al ₂ O ₃ · CaSO ₄ · 32H ₂ O) together with Calcium silicate hydrate (3CaO · 2SiO ₂ · 3H ₂ O) It is a characteristic of the chemical composition, and the etrinzite increases the dehydration effect, as can be seen from the reaction obtained by reacting 100 CaSO ₄ with 141 H ₂ O and 66 with 33CaOAl ₂ O ₃ . .

Further, the aluminate legacy lime water storage has eth- Lin Xi specific acid-type agent _{(3CaO · Al 2 O 3 ·} CaSO 4 · 32H 2 O) and the mono trim ZUID _{(3CaO · Al 2 O 3 ·} CaSO 4 · 12H 2 O) is present. Ethrinzite is a needle crystal that can be identified by electron microscopy or crystallization to fill gaps in crystals such as lime oxide of E-CON, and digests hydrates of solidified objects. By this action, it expands and has the ability to solidify harmful heavy metals and organic matters together with solidification of solidification, and it is stable in that carbonation does not proceed in the ground where there is a lot of moisture and air permeation is combined with a large amount of water. It is a high mineral. As a needle crystal, it can produce various complex chlorides as well as tightness of tissues and adhesion of harmful substances, and this property is achieved by the fixing ability by substitution of harmful heavy metals. Therefore, the degree of orderability is improved than before improvement. Ethrinite production helps to have the ability of expressing high solidification strength and early strength, and the hydration reaction of E-CON requires a large amount of bound water and absorbs a large amount of bound water from the solidified object. As the action proceeds, the dehydrating effect of E-CON is enhanced.

The ethrinzite produced during the initial hydration is transformed into a monosulfate hydrate (monosurface hydrate: 3CaO · Al ₂ O ₃ · CaSO ₄ · 12H ₂ O) over time, and the monosulfate hydrate in the E-CON Presence lowers acid resistance. The crystal form of ethrinzite varies from fine crystals of about 1 μm to large needle crystals of several 10 μm, and forms a three-dimensional combination of the skeleton in the soil. The role of the production of ethrinzite in soil is to decrease the water content and to fill the gap by the combination of ethrinzite crystals and gels and to increase the high tension between the granules.

Briefly describing the type and characteristics of the hydrate produced according to the present invention are shown in Table 3 below.

Table 3

Hereinafter, the present invention will be described in detail by way of examples.

Example 1

After mixing 15 parts by weight of the solidified composition and 13.5 parts by weight of water with respect to 100 parts by weight of soil to form a test body by mixing and stirring, the flexural strength, compressive strength and coefficient of permeability were measured, and the construction shrinkage and crack presence were examined. . At this time, the soil was Masato, solidified by the combination of the following [Table 4], the results are shown in [Table 5].

Table 4

Table 5

As shown in [Table 5], when the solidified composition (E-CON) of the compounding ratio according to the present invention in combination with soil, it can be seen that it has excellent bending strength, compressive strength and permeability coefficient, In addition, it can be seen that dry shrinkage and cracking do not occur.

Example 2

15 parts by weight of binder and 13.5 parts by weight of water were added to 100 parts by weight of soil, and then mixed and stirred to form a test body. Then, the flexural strength, compressive strength, and permeability coefficient were measured, and construction contraction, crack presence, and environmental characteristics were measured. Inspected. At this time, the binder was selected and blended according to [Table 6] below, to form a solidified composition (E-CON) according to the present invention by the mixing ratio according to N0.5 of the [Table 4]. (Test method: according to the waste process test method)

Test results according to Example 2 are shown in the following [Table 7] and [Table 8].

Table 6

Table 7

Table 8

As shown in [Table 7] and [Table 8], when the solidifying agent composition (E-CON) according to the present invention is blended, it is found that it has excellent physical properties and environmental properties, compared to the formulation of other binders. Can be.

Hereinafter, the packaging method using the solidified material composition (E-CON) will be described.

Figure 1 shows a block diagram showing a packaging method according to the present invention, the present invention is a mixture to produce a soil package by mixing and stirring 15 parts by weight of the solidified composition and 12 to 14 parts by weight of water with respect to 100 parts by weight of soil step; First laying and compacting the soil package; After the compaction of the installed soil pavement, the first stop working step to perform the surface cleaning and planarization work; A primary crack prevention step of inserting and installing expansion joints to prevent cracking; A secondary laying and compacting step of laying soil pavement and compacting it after construction of expansion joint material; A surface strengthening agent applying step of applying a surface strengthening agent to the secondary paving and compacted soil package and the packaging surface; Curing step of covering and curing the curing cloth after applying the surface strengthening agent; It is intended to include a cutting step for constructing shrinkage joints for crack prevention after curing.

The compounding step is carried out on-site, and transported and installed to the workplace after mixing.

In the first laying and compacting step, after placing the mixed soil package to a predetermined thickness in the workshop, and compacts the installed soil package.

The first stop operation step is a work for cleaning and flattening the basic surface of the first soil package installed.

The primary crack prevention step is to install the expansion joint material to prevent cracking, the expansion joint material is installed by inserting a wood or elastic expansion material. At this time, the installation spacing and the installation depth of the expansion joint is installed by adjusting the thickness of the primary pavement.

As an example, the primary laying is laid about 1/2 of the final target compaction height, and the expansion joint is installed based on the final compaction height (about 5 to 20 cm), whereby the primary laying is the expansion joint Lay in about 5 ~ 15㎝ which is about 1/2 of.

The secondary laying and compacting step is a step for grasping the surface and grading the surface, and after installing the expansion joint material, and compacted by secondary laying the soil package to a predetermined thickness. At this time, the thickness of the secondary pavement and the stepped soil pavement is not particularly limited, but is preferably installed in a thickness of about 5 to 15 cm.

That is, the final target compaction thickness is about 5 to 20 cm, and the primary laying thickness should be about 5 to 15 cm, about 1/2 of the final compaction target, and in the case of secondary laying, the primary laying and compaction height Lay and compact about 5 to 15 cm corresponding to the final final compaction target to fit the target compaction height of about 5 to 20 cm.

The surface reinforcing agent applying step is a step for strengthening the durability of the package and the package surface, after the second compaction, the surface-reinforced aqueous solution is applied 0.5 to 1kg / ㎡.

The surface-enhanced aqueous solution is used by mixing and diluting the surface-enhancer and water in a weight ratio of 1: 1 to 10, and preferably has a weight ratio of 1: 5.

The surface strengthening agent is composed of 40 to 70% by weight of the liquid resin, 20 to 50% by weight of the liquid additive, and 10 to 20% by weight of bentonite.

The liquid resin serves as a binder, a surface coating, 40 to 70% by weight is added to improve the UV blocking effect and the penetration resistance of water or salt. The liquid resin is selected from acrylic liquid resin, EVA liquid resin, PVA liquid resin or a mixture thereof.

The liquid additive acts as a binder (curing material) and curing rate, surface coating, and improves the penetration resistance of water. The liquid additive is one or more selected from the group consisting of sodium silicate (liquid), sodium silicate (liquid), lithium silicate (liquid), silica sol (liquid).

The bentonite improves the effectiveness of the evidence, prevents the separation of materials, and serves to improve the workability by imparting lubricity, plasticity, and cohesiveness, and select or mix Na bentonite or Ca bentonite.

Surface strengthening agent according to the present invention made as described above has the physical properties as shown in Table 9 below.

Table 9

The surface strengthening agent of the present invention made as described above is installed in the soil package to bond / fix the soil particles, cross-linking and forming an insoluble film at the same time to increase the wear of the soil surface. That is, the soil mainly consists of constituents such as Al ₂ O ₃ , Fe ₂ O ₃ , CaO and MgO depending on the type of SiO ₂ and other soils, and these components form a chemically stable crystal structure. none. However, a small amount of active polyvalent ions are present, and these components react with the polymer, which is one of the components of the surface hardener, to form insoluble crosslinks, thereby binding / fixing the stable soil particles. In addition, the surface strengthening agent of the present invention increases the wear property of the soil surface by forming an insoluble film simultaneously with crosslinking.

Hereinafter, the surface hardener according to the present invention will be described in detail with reference to Examples.

Example 3

The surface strengthening agent according to the formulation of Table 10 below was mixed with water at a weight ratio of 1: 5, and 0.5 kg / m 2 was applied to the test body according to Example 2, and the wear loss and the cohesiveness were tested accordingly. The results are shown in [Table 11]. At this time, the wear loss is in accordance with KS F 2813.

Table 10

Table 11

As shown in [Table 11], when the surface-reinforced aqueous solution of the present invention is applied, it can be seen that the wear loss is very good as 1.0mg / ㎜, which is the amount of wear when the surface-reinforced aqueous solution of the present invention is not applied Considering that 1.7 mg / mm 2, it can be seen that the wear amount is reduced by about 41%.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

1 is an exemplary block diagram showing a packaging method according to the present invention

Claims (6)

30 to 45 weight percent alumina cement, 20 to 35 weight percent slag powder, 5 to 15 weight percent portland cement, 5 to 15 weight percent expanding agent, 0.1 to 5 weight percent glidant, sodium sulfate or alum 1 to 5 weight percent, pigment 1 -5% by weight, 1-5% by ocher, 0.1-5% by weight thickener, 0.1-5% by weight fibers, soil solidifying composition for packaging. delete The method according to claim 1; Slag fine powder is one of blast furnace slag, steelmaking slag, non-ferrous slag or a mixture thereof, The glidant is a lignin-based or naphthalene-based or melamine-based fluidizing agent, The thickener is bentonite or cellulose or methylcellulose, The earthenware composition for soil packaging, characterized in that the fiber is nylon or polyvinyl acetate or polyester. delete In a soil pavement method; A mixing step of mixing and stirring 15 parts by weight of the solidified composition for soil packaging according to claim 1 or 3 and 12 to 14 parts by weight of water with respect to 100 parts by weight of soil to produce an earthen package; First laying and compacting the soil package and compacting it; After the compaction of the installed soil pavement, the first stop working step to perform the surface cleaning and planarization work; A primary crack prevention step of inserting and installing expansion joints to prevent cracking; A secondary laying and compacting step of laying the soil pavement and compacting it after the construction of the expansion joint material; A surface strengthening agent applying step of applying a surface strengthening agent to the secondary paving and compacted soil package and the packaging surface; Curing step of covering and curing the curing cloth after applying the surface strengthening agent; Soil paving method using a solid fire composition for soil packaging, characterized in that it comprises a cutting step for constructing the shrinkage joint for crack prevention after curing. The method according to claim 5; The surface hardener is composed of 40 to 70% by weight of the liquid resin, 20 to 50% by weight of the liquid additives, 10 to 20% by weight of bentonite, The liquid resin is selected from acrylic liquid resin, EVA liquid resin, PVA liquid resin, or a mixture thereof, The liquid additive is selected from the group consisting of sodium silicate (liquid), sodium silicate (liquid), lithium silicic acid (liquid), silica sol (liquid), The bentonite is Na bentonite or Ca bentonite, or a soil paving method using a solid material composition for soil packaging characterized in that used by mixing them.

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