KR20190067729A - Soil composition including cross-linked biopolymer using organic acid and preparing method of the same - Google Patents

Abstract

The present invention relates to a soil composition including a biopolymer cross-linked by organic acid, which improves resistance to water and durability, and to a preparing method thereof. The soil composition of the present invention comprises a biopolymer cross-linked by soil and organic acid.

Description

TECHNICAL FIELD [0001] The present invention relates to a soil composition comprising a biopolymer cross-linked by an organic acid and a method for producing the soil composition.

The present invention relates to a soil composition comprising a biopolymer cross-linked by an organic acid and a process for its preparation.

In general, soil will lose its structure and strength when in contact with water. This is a very big constraint in terms of the engineering use of the soil, and it has been a problem that mankind has been troubled for thousands of years with the civilization of mankind. Ancient Sumerians used bitumen to increase the waterproofness of the soil. In many areas, straws were used to improve soil strength and durability. Since the modern era, the engineering treatment of soil has made a significant development by introducing Portland cement, various industrial by-products (blast furnace slag, fly ash, etc.) and chemical products (epoxy, urethane, etc.). However, as the importance of the environment has increased recently, the environmental impacts have been considered in construction and civil engineering. In this case, conventional cement and other chemical treatment methods are severely restricted in use. Cement is known to be a typical greenhouse gas emission material, and in the process of cementation, it becomes a high pH state and disturb the water ecosystem when it is adjacent to water. Recently, various attempts have been made for eco - friendly soil treatment technology.

On the other hand, the geotechnical composition of the soil, strictly speaking, the particle size distribution, the water content and the organic content directly affect the soil erosion. Today, soil erosion has emerged as an important environmental problem because soil erosion has direct or indirect effects on desertification and climate change. Desertification, now accompanied by soil erosion, is ongoing at one-third of the world's land area and is expanding to 12 million hectares of new desert every year. Soil erosion causes not only ecosystem disturbance but also degradation of agricultural land productivity, so it is urgent to develop a technology that can reduce or suppress it.

US 4663067 A US 5860770 A US 7407993 B

The present invention provides a biopolymer-soil composition cross-linked by an organic acid and a method of preparing the same.

However, the problems to be solved by the present invention are not limited to the problems described above, and other problems not described can be clearly understood by those skilled in the art from the following description.

A first aspect of the invention provides a soil composition comprising a biopolymer cross-linked by soil and an organic acid.

A second aspect of the invention is a process for preparing a soil composition according to the first aspect of the present invention, comprising preparing a cross-linked biopolymer by an organic acid and mixing the cross- And a manufacturing method thereof.

According to the present invention, the soil composition comprising a biopolymer cross-linked with soil and organic acid is very resistant to water and durability, thereby not only stabilizing the soil early, but also improving the strength of medium and long- There is an excellent effect. In particular, the biopolymer, which is the main material used in the present invention, is a hydrocarbon-based polymer material capable of minimizing the effects on groundwater or soil ecosystems, and the organic acids used for cross-linking are also environmentally friendly and environmentally friendly.

Therefore, the soil composition comprising the biopolymer cross-linked by soil and organic acid according to the present invention can be applied not only to a variety of soil conservation fields but also to the soil improvement in a large construction site, the ground injection, the stabilization of the surface, , Soil erosion control, road and rail embankment stabilization, large-scale farmland formation, and desertification prevention.

The soil composition comprising the biopolymer cross-linked by soil and organic acid according to the present invention has improved durability and durability as compared with the conventional biopolymer-soil composition, so that safety can be ensured after the construction for a longer period of time.

The soil composition comprising the biopolymer cross-linked with soil and organic acids according to the present invention can effectively control the permeability in the soil under high hydraulic pressure conditions due to the existence of a very rigid cross-linked biopolymer in the pores of the soil .

Fig. 1 shows the results of soil improvement using conventional biopolymers.
Fig. 2 is a graph showing the strength of a conventional yellow biopolymer added to yellow loess.
3 is a schematic diagram of cross-linking of a biopolymer by an organic acid according to one embodiment of the invention.
FIG. 4 is a graph illustrating the results of measurement of the strength of the soil composition including the cross-linked biopolymer by the organic acid according to one embodiment of the present invention in the dry and wet state.
FIG. 5 is a graph illustrating the optimum heating temperature and heating time measured at different heating temperatures and heating times in the process of producing a cross-linked biopolymer by an organic acid in one embodiment of the present invention.
FIG. 6 is a graph illustrating an optimum heating temperature measured by varying the heating temperature in the drying / dehydrating process after mixing the cross-linked biopolymer with the soil in one embodiment of the present invention.
FIG. 7 is a graph illustrating the measurement of titration temperature in a second order cross-linking (bio-polymer-soil cross-linking) process in one embodiment of the present invention.

Hereinafter, embodiments and examples of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the present invention.

It should be understood, however, that the present invention may be embodied in many different forms and is not limited to the embodiments and examples described herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

Throughout this specification, when a member is "on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

As used herein, the terms "about," " substantially, "and the like are used herein to refer to or approximate the numerical value of manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to prevent unauthorized exploitation by unauthorized intruders of the mentioned disclosure. Also, throughout the present specification, the phrase " step "or" step "does not mean" step for.

Throughout this specification, the term "combination (s) thereof " included in the expression of the machine form means a mixture or combination of one or more elements selected from the group consisting of the constituents described in the expression of the form of a marker, Quot; means at least one selected from the group consisting of the above-mentioned elements.

Throughout this specification, the description of "A and / or B" means "A or B, or A and B".

Hereinafter, embodiments of the present invention are described in detail, but the present invention is not limited thereto.

A first aspect of the invention provides a soil composition comprising a biopolymer cross-linked by soil and an organic acid.

In one embodiment of the present invention, it may include, but is not limited to, about 0.01 to about 100 parts by weight of a bio-polymer cross-linked by the organic acid based on about 100 parts by weight of the soil.

In one embodiment of the invention, the bio-polymer cross-linked by the organic acid may include, but is not limited to, about 0.001 to about 100 parts by weight of the organic acid based on about 100 parts by weight of the biopolymer .

In one embodiment of the present invention, the biopolymer may be any polymeric material produced from an organism, but may not be limited thereto. The biopolymer may include a substance having glucose as a monomer. The biopolymer may be classified into a polysaccharide and an amino acid, and the biopolymer of the polysaccharide series may include Depending on its shape, it can be divided into high-molecular chains and gelation biopolymers. For example, the polymer chain biopolymer may include beta-1,3 / 1,6-glucan (Polycan ™), alpha-glucan, Curdlan, etc., and the gelling biopolymer may include Welan gum But are not limited to, Wellan gum, Gellan gum, Xanthan gum, Agar gum, Succinoglycan gum, and the like. The amino acid-based biopolymer may include, but is not limited to, chitosan and gamma phage-a (PGA).

A biopolymer is a high molecular substance produced by a living organism. It refers to a variety of polymer substances that are synthesized in organisms and secreted into the body, such as carbohydrates, fats, proteins, nucleic acids and their complexes. In particular, water-soluble or insoluble polysaccharides are polymers produced by glycosidic bonds of at least ten monosaccharides or derived monosaccharides, and are the most abundant biomolecules in the human body and being useful to humans. Unlike chemical synthetic polymers, they are eco-friendly, and due to their functional properties such as gel formation, emulsion stability, surface tension control, water absorption, adhesion, lubrication and biofilm formation, It is used as a main material in the field.

In one embodiment of the invention, the soil may include, but is not limited to, those selected from the group consisting of fine clay (clay), granular (sand), and combinations thereof.

In one embodiment of the present invention, the organic acid is selected from the group consisting of malonic acid, carboxylic acid, sulfonic acid, formic acid, acetic acid, but are not limited to, propionic acid, butyric acid, valeric acid, caproic acid, oxalic acid, lactic acid, malic acid, citric acid, Benzoic acid, carbonic acid, phenol, uric acid, taurine, aminomethylphosphonic acid, and combinations thereof. But may not be limited thereto.

In one embodiment of the invention, the biopolymer molecules are linked by the organic acid, so that the intermolecular interaction has a stronger binding force.

In one embodiment of the present invention, cross-linking of the biopolymer by the organic acid may increase the resistance and durability against external factors such as water, but may not be limited thereto.

In one embodiment of the present invention, the cross-linked biopolymer by the organic acid may increase the binding force between the soil particles, but may not be limited thereto.

In one embodiment of the present invention, the biopolymer exhibits low viscosity at a high temperature so that it can be easily mixed with the soil, and the viscosity of the biopolymer rapidly increases with cooling, thereby forming a stable biopolymer-soil bonding composition. .

In one embodiment of the present invention, the soil composition comprising a biopolymer cross-linked by the organic acid has improved strength and resistance to water and durability as compared with soil containing no bio-polymer.

In one embodiment of the present invention, the soil composition comprising a biopolymer cross-linked by the organic acid has improved strength compared to soil that does not contain the biopolymer in wet state, has excellent water resistance and durability Do.

A second aspect of the invention is a process for preparing a soil composition according to the first aspect of the present invention, comprising preparing a cross-linked biopolymer by an organic acid and mixing the cross- And a manufacturing method thereof.

All of the contents described in relation to the first aspect can be applied to the cross-linked biopolymer by the organic acid according to this aspect.

In one embodiment of the present invention, a method for preparing a cross-linked biopolymer by the organic acid is as follows.

First, a solvent capable of forming an aqueous biopolymer solution is prepared. The solvent may be, but not limited to, distilled or general water.

A high viscosity biopolymer-containing solution that is gelled is prepared by dissolving one or more polysaccharide series biopolymers from about 0.01 to about 60 (60%) by weight based on 100 parts by weight of the solvent. At this time, a more homogeneous biopolymer-containing solution can be formed by heating the solution to 200 ° C or less.

The homogenized gelled biopolymer-containing solution is cooled to a temperature of 20 ° C to 150 ° C and stabilized.

The organic acid is added to the gelled biopolymer-containing solution in a solid or liquid state. The organic acid weight ratio may be about 0.001 to about 100 (100%) based on 100 parts by weight of the biopolymer-containing solution.

After the addition of the organic acid, the organic acid-1 or more gelled biopolymer-containing solution is homogeneously stirred to induce the organic acid to cross-bond between the biopolymers. At this time, the stirring speed may be adjusted between 10 rpm and 5000 rpm to accelerate the reaction, and the temperature may also be adjusted between 20 캜 and 150 캜.

 To further promote cross-linking, the catalyst may be added in an amount of from 0.01 to 50 (50%) based on 100 parts by weight of the organic acid-added gelled biopolymer-containing solution. The catalyst may be sodium hypophosphite monohydrate or the like, but is not limited thereto.

 The mixed solution may be stirred for at least one minute to a maximum of 24 hours so that cross-linking is sufficiently formed, but the present invention is not limited thereto.

In one embodiment of the invention, the step of adding the organic acid to the gelling biopolymer-containing solution and stirring to produce a cross-linked biopolymer by the organic acid is performed at 50 ° C to 200 ° C for 10 minutes to 4 hours But is not limited to, heating.

 The completed cross-linked biopolymer-containing solution is mixed, poured, or sprayed from 0.01 to 100 (100%) based on 100 parts by weight of soil.

The cross-linked biopolymer-containing solution and the soil are homogeneously mixed to form a homogeneous biopolymer-soil composition.

After the mixing, injection or spraying, the biopolymer-soil composition is dried / dehydrated at a temperature below about 60 ° C, specifically between 20 ° C and 50 ° C, to induce secondary cross-linking (biopolymer-to-soil cross-linking).

At this time, if the temperature is further heated to not less than about 70 ° C and not more than about 200 ° C after the drying / dewatering, the biopolymer-soil cross-linking is promoted. Further, when the drying after the drying / dehydration is carried out under a pressurized condition of a pressure range of 0.1 MPa to 2 MPa, the biopolymer-soil cross-linking is further enhanced.

3 is a schematic diagram illustrating a process for producing a cross-linked biopolymer by an organic acid according to one embodiment of the present invention.

In one embodiment of the invention, the soil may include, but is not limited to, those selected from the group consisting of fine clay (clay), granular (sand), and combinations thereof.

In one embodiment of the invention, mixing the cross-linked biopolymer with the organic acid comprises mixing the bio-polymer cross-linked by the organic acid with the soil, spraying it onto the surface of the soil, Or injected into the soil, but the present invention is not limited thereto. The bio-polymer cross-linked by the organic acid may be mixed directly with the soil, or the bio-polymer powder or the suspension / aqueous solution may be applied to the surface of the soil to form a covering or injected into the soil. . Also, the cross-linked biopolymer may be directly mixed with the soil by the organic acid, and then the biopolymer may be placed on the surface of the target area. However, the present invention is not limited thereto.

In one embodiment of the invention, the cross-linked biopolymer by the organic acid may be, but not limited to, forming a gel upon cooling after heat treatment. The gel is formed and the strength is improved upon cooling after the heat treatment, so that even if the soil composition containing the biopolymer is immersed or saturated in water, its structure is not disturbed and the strength can be maintained constant.

In one embodiment of the present invention, the biopolymer exhibits a low viscosity at a high temperature to be easily mixed with the soil, and the viscosity of the biopolymer rapidly increases with cooling, thereby forming a stable soil-biopolymer binding composition. .

In one embodiment of the invention, the bio-polymer cross-linked by the organic acid is added to the soil followed by sufficient heating at a temperature of about 200 ° C or less, followed by cooling to about 60 ° C or less to induce gelation of the biopolymer But may not be limited thereto. For example, the heating temperature may be about 200 ° C or less, about 180 ° C or less, about 160 ° C or less, about 140 ° C or less, about 120 ° C or less, about 100 ° C or less, The cooling temperature may be about 60 占 폚 or lower, about 50 占 폚 or lower, about 40 占 폚 or lower, about 30 占 폚 or lower, or about 20 占 폚 or lower, but is not limited thereto.

In one embodiment of the present invention, the organic acid is selected from the group consisting of malonic acid, carboxylic acid, sulfonic acid, formic acid, acetic acid, but are not limited to, propionic acid, butyric acid, valeric acid, caproic acid, oxalic acid, lactic acid, malic acid, citric acid, Benzoic acid, carbonic acid, phenol, uric acid, taurine, aminomethylphosphonic acid, and combinations thereof. But may not be limited thereto.

In one embodiment of the invention, the biopolymer molecules are linked by the organic acid, so that the intermolecular interaction has a stronger binding force.

In one embodiment of the present invention, cross-linking of the biopolymer by the organic acid may increase the resistance and durability against external factors such as water, but may not be limited thereto.

In one embodiment of the present invention, the cross-linked biopolymer by the organic acid may increase the binding force between the soil particles, but may not be limited thereto.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following Examples are given for the purpose of helping understanding of the present invention, but the present invention is not limited to the following Examples.

[ Example ]

Example  1: crossed by organic acids - Combined Biopolymer  Produce

A cross-linked biopolymer was prepared by mixing malonic acid and starch together with water to effect an esterification reaction with the malonic acid.

First, a solvent for the preparation of an aqueous solution of a biopolymer was prepared. The solvent may be, but is not limited to, distilled or general water

A starch aqueous solution was prepared by adding starch from 0.001 to 60 (60%) based on 100 parts by weight of the solvent. The starch aqueous solution was maintained at a temperature of 100 ℃ or higher to prepare a gelatinized starch aqueous solution. The aqueous gelatinized starch solution was cooled to below 60 ° C and stabilized.

The malonic acid was added at a ratio of 0.001 to 40 (40%) based on 100 parts by weight of the aqueous gelatinized starch solution. Malonic acid can be mixed in powder or diluted liquid form. Here, a catalyst may be added to promote cross-linking of starch due to malonic acid. The catalyst may be sodium hypophosphite, but is not limited thereto.

The aqueous solution was continuously stirred to promote cross-linking to complete a cross-linked biopolymer-containing aqueous solution by malonic acid.

The manufacturing process is shown in Fig.

Example  2: crossed by soil and organic acid - Combined Biopolymer  Preparation of the soil composition and its strength measurement

The cross-linked biopolymer and soil were prepared by the malonic acid prepared in Example 1, respectively. The soil composition was prepared by mixing the biopolymer with soil.

The aqueous solution prepared in Example 1 was mixed with soil at a weight ratio of 0.001 to 100 (100%) based on 100 parts by weight of soil.

The cross-linked biopolymer aqueous solution was homogeneously mixed with soil and then shaped into a desired shape.

The cross-linked biopolymer-soil composition after molding was dried (dehydrated) at a temperature below 60 ° C to increase cross-linked biopolymer and soil bond strength.

After drying, the cross-linked biopolymer-soil composition was cured for at least one hour at a temperature of 80 ° C to 200 ° C to induce secondary cross-linking (biopolymer-soil cross-linking).

 After all, the biopolymer-soil composition was cooled to room temperature conditions to complete the cross-linked biopolymer-soil composition.

The compressive strengths of the prepared soil compositions and various comparative examples were measured for dry and wet conditions. Specifically, the composition herein comprises 0.01 parts by weight of cross-linked biopolymer relative to 100 parts by weight of soil. The compressive strength of the soil composition comprising the cross-linked biopolymer by the organic acid according to the present invention is 1 part by weight of xanthan gum, 1 part by weight of gellan gum and 1 part by weight of agar gum for 100 parts by weight of soil and soil not treated with biopolymer, The compressive strength of the soil composition containing the cross-linked biopolymer by the organic acid of the present invention was much higher than that of the comparative example containing the component (Fig. 4).

Example  3: crossed by organic acids - Combined Biopolymer  Determination of heating time, temperature, pressure relationship

Experiments were conducted to establish optimum heat treatment conditions to facilitate the cross-linking reaction of the biopolymer by organic acid before and after mixing the cross-linked biopolymer and soil with organic acid. Specifically, an organic acid was added to the biopolymer aqueous solution during the preparation of the cross-linked biopolymer before mixing with the soil, and then the optimal heating temperature and heating time were measured by varying the heating temperature and heating time. The cross- After mixing with soil, the optimum heating temperature was measured by varying the heating temperature during the drying (dehydration) process. After the drying process, the optimum heating temperature was measured in the second crossover (bio-polymer-soil cross-linking) process, which is a post-curing process.

First, the organic acid was added to the aqueous solution of the biopolymer in the course of preparing the cross-linked biopolymer before mixing with the soil. The measurement result of the heating temperature and the heating time were as follows. Referring to FIG. 5, Crosslinking of the biopolymer was promoted when heated, but cross-linking of the biopolymer was insufficient when heated at a temperature of less than 50 ° C, so that the effect of increasing the compressive strength was not significant. In addition, it was confirmed that when the heating time exceeded 1 hour even after heating to 50 ° C or higher, the effect of increasing the compressive strength was deteriorated, and as the time became longer, the cross-linking became insufficient. Therefore, it was found that the heat treatment at 90 ° C for 30 minutes was the most effective in improving the compressive strength in the cross-linked biopolymer preparation before mixing with soil.

Referring to FIG. 6, the results of measuring the optimal heating temperature by mixing the cross-linked biopolymer with the soil and varying the heating temperature during the drying (dehydrating) process will be described. In the drying process, It is confirmed that the effect of increasing the compressive strength is rather deteriorated. Specifically, the X-axis in FIG. 6 is the same as the heating time in the process of manufacturing the cross-linked biopolymer before mixing with the soil in FIG. 5, and the Y-axis is the cross- Shows the compressive strength of the soil-cross-linked biopolymer mixture according to the heating temperature (oven temperature) in the drying (dehydrating) process. That is, when the graph is interpreted, when the heating temperature is set to 20 ° C to 50 ° C in the drying process, the compressive strength gradually increases in the drying process, but the heating time of the cross- , And the compressive strength gradually decreased after 1 hour. On the other hand, when the heating temperature exceeds 50 ° C in the drying process, it is confirmed that the compressive strength is decreased regardless of the heating time of the cross-linked biopolymer before mixing with the soil.

5 and FIG. 6 are integrated, it can be seen that heat treatment is performed at 90 ° C for 30 minutes in the process of producing the cross-linked biopolymer before mixing with the soil, and after drying (dehydration) after mixing the biopolymer cross- It was confirmed that the heat treatment at 20 ° C to 50 ° C is the optimum combination condition.

Referring to FIG. 7, the heating temperature in the second-order cross-linking (biopolymer-soil cross-linking) process as a post-curing process after the drying process will be described. Curing at a temperature of not less than 70 ° C. and not more than 200 ° C. after the drying process was confirmed to be more excellent than that of the biopolymer - inter-soil cross-linking.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics of the present invention. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention.

Claims (17)

Cross-linked biopolymer by soil and organic acid
≪ / RTI >
The method according to claim 1,
The organic acid may be selected from the group consisting of malonic acid, carboxylic acid, sulfonic acid, formic acid, acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, oxalic acid, lactic acid, malic acid, citric acid, benzoic acid, Lt; / RTI > acid and combinations thereof.
The method according to claim 1,
Wherein the bio-polymer cross-linked by the organic acid comprises 0.001 to 100 parts by weight of the organic acid based on 100 parts by weight of the biopolymer.
The method according to claim 1,
And 0.01 to 100 parts by weight of a biopolymer cross-linked by the organic acid based on 100 parts by weight of the soil.
A cross-linked biopolymer is prepared by an organic acid,
Mixing the cross-linked biopolymer with the soil by the organic acid
≪ / RTI >
6. The method of claim 5,
The production of the cross-linked biopolymer by the organic acid,
A gelation biopolymer-containing solution was prepared,
Adding the organic acid to the gelling biopolymer-containing solution and stirring to thereby prepare a cross-linked biopolymer by the organic acid
≪ / RTI >
The method according to claim 6,
Wherein the gelling biopolymer-containing solution is prepared by mixing 0.01 to 60 parts by weight of the biopolymer based on 100 parts by weight of the solvent.
The method according to claim 6,
Wherein the biopolymer cross-linked by the organic acid is prepared by mixing 0.001 to 100 parts by weight of the organic acid based on 100 parts by weight of the gelling biopolymer-containing solution.
The method according to claim 6,
The gelling biopolymer-containing solution is prepared by dissolving the biopolymer in a solvent at 200 ° C or lower and then mixing and cooling the mixed solution to 20 ° C to 150 ° C for stabilization and gelation. A method for producing a soil composition.
The method according to claim 6,
Wherein the organic acid is added to the gelling biopolymer-containing solution and the temperature range of stirring is from 20 캜 to 150 캜.
The method according to claim 6,
The organic acid is added to the gelling biopolymer-containing solution, and the mixture is stirred at a rate of 10 rpm to 5000 rpm.
The method according to claim 6,
Wherein preparing the cross-linked biopolymer by the organic acid further comprises adding a catalyst for cross-linking.
The method according to claim 6,
Wherein said organic acid is added to said gelled biopolymer-containing solution and stirred to produce a cross-linked biopolymer by said organic acid, said method further comprising heating at 50 DEG C to 200 DEG C for 10 minutes to 4 hours, ≪ / RTI >
6. The method of claim 5,
Wherein 0.01 to 100 parts by weight of a cross-linked biopolymer is mixed with the organic acid based on 100 parts by weight of the soil to prepare the soil composition.
6. The method of claim 5,
Further comprising dewatering the soil composition at 20 ° C to 50 ° C after mixing the soil with the cross-linked biopolymer by the organic acid to produce the soil composition.
6. The method of claim 5,
In order to improve the cross-coupling of the soil composition after mixing the soil with the cross-linked biopolymer by the organic acid to prepare the soil composition,
Further comprising heating the soil composition at a temperature in the range of from 70 DEG C to 200 DEG C after dewatering.
6. The method of claim 5,
In order to improve the cross-coupling of the soil composition after mixing the soil with the cross-linked biopolymer by the organic acid to prepare the soil composition,
Further comprising pressurizing the soil composition in a pressure range of from 0.1 MPa to 2 MPa after dewatering.

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