CN112226233A

CN112226233A - Soil curing agent, cured soil and application thereof

Info

Publication number: CN112226233A
Application number: CN202011149998.3A
Authority: CN
Inventors: 刘泽坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-01-15

Abstract

The invention relates to the technical field of solidifying agents, and particularly provides a soil solidifying agent, solidified soil and application thereof. The invention provides a soil curing agent, which is prepared from 20-30 parts of a dispersing agent, 1-2 parts of a salt compound, 3-6 parts of a biological enzyme, 0.1-0.4 part of a small molecular alcohol and 60-80 parts of a solvent. The sulfonate formaldehyde condensate with specific content is selected as a dispersant, interacts with a salt compound, biological enzyme and a solvent in a system, can perform ion adsorption and exchange with soil particles, enables the particles to tend to agglomerate, enables the soil particles to be tightly linked, and can fully fill pores among the soil particles by reaction products, so that solidified particles are easy to compact into a whole, thereby being beneficial to improving the frost resistance, the compressive strength, the water resistance, the stability and the wet and heat aging resistance.

Description

Soil curing agent, cured soil and application thereof

Technical Field

The invention relates to the technical field of solidifying agents, and particularly provides a soil solidifying agent, solidified soil and application thereof.

Background

The soil stabilizer is a novel energy-saving and environment-friendly engineering material synthesized by various inorganic and organic materials and used for curing various soils, has the advantages of high curing speed, high early strength, less consumption, local materials, construction time saving, engineering cost reduction and the like, and is widely applied.

Although the current soil stabilizer reinforcement technology in China is applied to traffic road engineering and water conservancy channel seepage-proofing engineering, the used soil stabilizer reinforced soil generally has the defects of low strength, poor water-resistant stability, easy aging under the damp-heat condition and the like, and in addition, the soil stabilizer reinforced soil has excellent frost resistance while the performance is hardly improved. Because the soil property of China is complicated and changeable, the introduced soil solidification technology is difficult to adapt to the requirements of various soil types. At present, the development of a soil solidification material with excellent performance is a direction actively explored by the engineering community at home and abroad. Therefore, research and development of a novel curing agent suitable for the soil property of China necessarily bring important economic and social benefits, promote the development of the strengthening technology of China, and expand the application range and the use scale of the strengthening technology of China.

Disclosure of Invention

In order to solve the technical problems, the first aspect of the invention provides a soil solidifying agent, which comprises, by weight, 20-30 parts of a dispersing agent, 1-2 parts of a salt compound, 3-6 parts of a biological enzyme, 0.1-0.4 part of a small molecular alcohol, and 60-80 parts of a solvent.

As a preferable technical scheme of the invention, the dispersant is selected from one or a combination of a plurality of methyl naphthalene sulfonate formaldehyde condensate, amino naphthalene sulfonate formaldehyde condensate, benzyl naphthalene sulfonate formaldehyde condensate, wood beta-sodium naphthalene sulfonate formaldehyde condensate, alpha-sodium naphthalene sulfonate formaldehyde condensate and phenol sulfonate formaldehyde condensate.

According to a preferable technical scheme of the invention, the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is (1.5-2.4): 1.

as a preferred technical scheme of the invention, the content of sulfate in the methyl naphthalene sulfonate formaldehyde condensate is less than or equal to 5 percent, and the content of calcium and magnesium ions is less than or equal to 4000 ppm; the pH value of the phenol sulfonate formaldehyde condensate in 100g/L aqueous solution at 25 ℃ is 6.05-7.5.

As a preferable technical scheme of the invention, the salt compound is selected from one or a combination of more of sodium sulfate, sodium formate, sodium acetate and calcium chloride.

As a preferred technical scheme of the invention, the mass ratio of the sodium sulfate to the sodium formate to the sodium acetate is 1: (0.1-0.25): (0.04-0.08).

As a preferred technical scheme of the invention, the biological enzyme is selected from one or a combination of a plurality of beta-amylase, acid cellulase, beta-mannase, firmase, Palmase and Taranase.

As a preferable technical scheme of the invention, the small molecular alcohol is selected from one or a combination of a plurality of methanol, ethylene glycol, propylene glycol, 1, 4-butanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol, 1, 5-pentanediol, 1, 6-hexanediol, 2-ethylhexanediol, 3-methyl-1, 5-pentanediol, cyclohexane dimethanol, glycerol, trimethylolpropane and pentaerythritol.

The second aspect of the invention provides the firming soil, which comprises the soil firming agent.

The third aspect of the invention provides application of the soil curing agent, which is applied to highway subgrade, railway subgrade, dam curing, building foundation, airport runway curing and side slope fixing.

Has the advantages that:

1. in the preparation process of the soil curing agent, the sulfonate formaldehyde condensate with specific content is selected as the dispersant to interact with the salt compound, the biological enzyme and the solvent in the system, so that the sulfonate formaldehyde condensate can be adsorbed and exchanged with the soil particles, the particles tend to agglomerate, the soil particles are tightly bonded, the reaction product can fully fill the pores among the soil particles, the cured particles are easy to compact into a whole, and the improvement of the freezing resistance, the compressive strength, the water-resistant stability and the wet-heat aging resistance is facilitated.

2. The specific biological enzyme in the curing agent is selected, so that the curing agent is non-toxic, non-corrosive, environment-friendly and safe, can obviously improve the soil density and the road strength, can better and more durably cure the soil, and effectively prolongs the service life of the cured soil;

3. the soil stabilizer provided by the invention is applied to the prepared solidified soil, the compressive strength of the prepared solidified soil can reach 7MPa, the water-resistant stability is high, the freezing resistance is strong, the solidified soil is not aged under the damp and hot conditions, the requirements of road building, building foundation, dam solidification and the like can be met, and the soil stabilizer has high popularization and practical values.

Detailed Description

The disclosure may be understood more readily by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.

The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.

In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are not intended to limit the number requirement (i.e., the number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.

In a preferred embodiment, the preparation raw materials comprise, by weight, 23-26 parts of a dispersing agent, 1.2-1.5 parts of a salt compound, 4-5 parts of a biological enzyme, 0.2-0.3 part of a small molecular alcohol and 69-70 parts of a solvent.

In a more preferred embodiment, the preparation raw material comprises 25 parts by weight of dispersing agent, 1.3 parts by weight of salt compound, 4.5 parts by weight of biological enzyme, 0.25 part by weight of small molecule alcohol and 69.7 parts by weight of solvent.

Dispersing agent

In one embodiment, the dispersant is a sulfonate formaldehyde condensate.

In a preferred embodiment, the dispersant is selected from one or a combination of several of methyl naphthalene sulfonate formaldehyde condensate, amino naphthalene sulfonate formaldehyde condensate, benzyl naphthalene sulfonate formaldehyde condensate, sodium wood beta-naphthalene sulfonate formaldehyde condensate, sodium alpha-naphthalene sulfonate formaldehyde condensate, and phenol sulfonate formaldehyde condensate.

In a more preferred embodiment, the dispersant comprises a methylnaphthalene sulfonate formaldehyde condensate and a phenol sulfonate formaldehyde condensate.

In a more preferred embodiment, the mass ratio of the methylnaphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is (1.5 to 2.4): 1; more preferably, the mass ratio of the methylnaphthalenesulfonate formaldehyde condensate to the phenolsulfonate formaldehyde condensate is (1.9 to 2.1): 1; more preferably, the mass ratio of the methylnaphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is 2: 1.

in a more preferred embodiment, the methyl naphthalene sulfonate formaldehyde condensate has a sulfate content of 5% or less and a calcium magnesium ion content of 4000ppm or less; the pH value of the phenol sulfonate formaldehyde condensate in 100g/L aqueous solution at 25 ℃ is 6.05-7.5.

In a more preferred embodiment, the methylnaphthalenesulfonate formaldehyde condensate is purchased from the company, llc, bi-cyclic adjuvant, yang city; the phenolsulfonate formaldehyde condensate was purchased from Basf Tamol DN.

In the experimental process, the applicant finds that the compressive strength of the solidified soil can be improved by adding the methyl naphthalene sulfonate formaldehyde condensate, but the problem of reduced water-resistant stability can sometimes occur, and when the phenol sulfonate formaldehyde condensate is further added into the system, the problem of reduced water-resistant stability of the solidified soil can be solved, the compressive strength of the solidified soil is greatly improved, and the humidity-heat-resistant aging performance of the solidified soil is also improved. The reason is probably that the methyl naphthalene sulfonate formaldehyde condensate can be adsorbed on the surfaces of cement and soil particles to enable the cement and soil particles to show electrical properties, and the particles repel each other due to the same charges to achieve dispersion, so that the fluidity in the mixing process is increased, the mixing is more uniform, and the compressive strength is improved; the phenol sulfonate formaldehyde condensate is added probably because the steric hindrance is larger, the obstruction to the condensation between cement and clay particles is larger, and under the action of external gravity compaction and evaporation, the water is favorably discharged, so that the soil particles are tightly linked, and the compressive strength and the water-resistant stability of the solidified soil are enhanced. The methyl naphthalene sulfonate formaldehyde condensate and the phenol sulfonate formaldehyde condensate are mutually cooperated, so that the curing agent can react with cement and native soil particles more fully, the contact among the particles is enhanced, the curing agent can be well filled in the gaps of the particles, the particles are more compact after being compacted, the cohesive force is increased, the stability under the damp and hot conditions is higher, and the aging phenomenon is not easy to occur.

The applicant finds that when the phenolsulfonate formaldehyde condensate is excessively added into a system, the compressive strength, the water-resistant stability and the wet-heat aging resistance of the solidified soil obtained by applying the prepared curing agent are easy to be reduced, which is probably because when the phenolsulfonate formaldehyde condensate is excessively added, the spacing among soil particles is larger or the soil particles are unevenly distributed, a local weak part exists in a soil body, and cracks are easy to occur under the action of external conditions so that the structure is changed, and the compressive strength, the water-resistant stability and the wet-heat aging resistance are reduced; and when the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is controlled to be (1.9-2.1): 1, the above problems can be avoided.

Salt compound

In one embodiment, the salt compound is selected from one or more of sodium sulfate, sodium formate, sodium acetate and calcium chloride.

In a preferred embodiment, the salt compound includes sodium sulfate, sodium formate and sodium acetate.

In a more preferred embodiment, the mass ratio of sodium sulfate, sodium formate and sodium acetate is 1: (0.1-0.25): (0.04-0.08); more preferably, the mass ratio of the sodium sulfate, the sodium formate and the sodium acetate is 1: (0.15-0.2): (0.06-0.07); more preferably, the mass ratio of the sodium sulfate, the sodium formate and the sodium acetate is 1: 0.17: 0.065.

sodium sulfate

The sodium sulfate is salt generated by combining sulfate radical and sodium ions, is dissolved in water, and the solution is colorless and alkaline.

Sodium formate

The sodium formate is also called sodium formate, and the crystal contains two crystal waters, so the aqueous solution of the sodium formate is alkaline.

Sodium acetate

The sodium acetate is also called sodium acetate, is an organic matter, is colorless and transparent crystal or white particles in character, and is easy to dissolve in water.

In the application process, the applicant finds that the prepared solidified soil has poor freezing resistance, and when salt compounds comprising sodium sulfate, sodium formate and sodium acetate are further added into the system, the mass ratio of the sodium sulfate, the sodium formate and the sodium acetate is controlled to be 1: (0.15-0.2): (0.06-0.07) the problems can be solved, and the compressive strength, the water-resistant stability and the humidity and heat aging resistance of the soil can be further improved, which is probably because the addition of the specific salt compounds is beneficial to the rapid generation of hydration products so as to ensure the initial strength of the solidified soil, and the interaction of the specific salt compounds and the dispersing agent in the solidifying agent can ensure that the prepared solidifying agent achieves proper alkalinity, can neutralize organic matters in the plain soil, can bond different framework particles together under the combined action of the dispersing agent in the solidifying agent, can correct a plurality of unfavorable structures and physicochemical characteristics of the soil in a micro-level, increases the gravitation, makes the contact more compact, and is beneficial to the improvement of the freezing resistance, the compressive strength, the water-resistant stability and the humidity and heat aging resistance.

Biological enzymes

In one embodiment, the biological enzyme is a catalytic organic substance produced by living cells, and is mostly protein and a very small portion is RNA.

In a preferred embodiment, the biological enzyme is selected from one or more of beta-amylase, acid cellulase, beta-mannanase, firmase, parmesase and tylosin.

In a more preferred embodiment, the biological enzymes include firmase and tyrosin.

In a more preferred embodiment, the mass ratio of the firming enzyme to the tylosin is (0.8-1.2): 1; more preferably, the mass ratio of the firmase to the tylosin is 1: 1.

the firmase and the tylosin are commercially available, including but not limited to the firmase purchased from the american global enzyme products company; the tyrosinases were purchased from Nature Plus, inc.

The biological enzyme is a nontoxic and pollution-free protein multi-enzyme amino acid product, can effectively reduce soil moisture, and obviously improves soil density and bearing capacity. Under the catalytic action of biological enzyme, a large amount of organic macromolecules in the clay can be combined to form intermediate reaction enzyme. The substance can be replaced and adsorbed by clay ions, so that the water absorption capacity of soil particles is weakened, the hydrophilicity of the soil particles is reduced, a shielding effect is generated on water, a waterproof soil layer is formed, the soil loses the water re-absorption capacity after being compacted through compaction, and the mechanical benefit of the soil body after being compacted cannot be influenced even if water is added after being compacted. The invention selects the mass ratio of 1: 1, the firmase and the tylosin are prepared by fermenting plants and are mixed into soil in a dissolved state to compact the soil body. Under the action of it, the original physical, chemical and structural change trend and speed in soil are changed to promote the aggregation and combination of grains, reduce gaps, increase density and make the solidified soil obtain higher strength under the action of compaction.

Small molecule alcohol

In one embodiment, the small molecule alcohol is selected from one or more of methanol, ethylene glycol, propylene glycol, 1, 4-butanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol, 1, 5-pentanediol, 1, 6-hexanediol, 2-ethylhexanediol, 3-methyl-1, 5-pentanediol, cyclohexanedimethanol, glycerol, trimethylolpropane, and pentaerythritol.

In a preferred embodiment, the small molecule alcohol is methanol.

In the experimental process, the applicant finds that when methanol is added into a solvent and the addition amount of the methanol is controlled, the obtained solidified soil has more excellent performances in all aspects, probably because the addition of the methanol can enable the prepared solidifying agent to reach better suspension and dissolution states, and is beneficial to fully playing the functions of all components; however, methanol is not easy to be added too much, which is harmful to human body on one hand, and on the other hand, the excessive addition of methanol can change the setting time of cement therein, and can affect the curing process thereof.

Solvent(s)

In one embodiment, the solvent is water.

The invention relates to a preparation method of a soil stabilizer, which comprises the following steps:

adding the dispersing agent, the salt compound, the biological enzyme, the small molecular alcohol and the solvent into a stirrer according to the parts by weight, controlling the temperature at 200-300 ℃, and uniformly stirring to obtain the nano-composite material.

In a preferred embodiment, the method for preparing the soil solidifying agent comprises the following steps:

adding the dispersant, the salt compound, the biological enzyme, the small molecular alcohol and the solvent into a stirrer according to the parts by weight, controlling the temperature at 250 ℃, and uniformly stirring to obtain the nano-composite material.

The invention provides solidified soil, and the preparation raw materials comprise the soil solidifying agent.

In a preferred embodiment, the raw materials for preparing the solidified soil further comprise plain soil and cement.

In a more preferable embodiment, the cement accounts for 5-10% of the total mass of the cement and the plain soil, the plain soil accounts for 89-95% of the total mass of the cement and the plain soil, and the soil solidifying agent accounts for 0.02-0.04% of the total mass of the cement and the plain soil.

The cement is P.O42.5 ordinary portland cement.

The preparation method of the solidified soil comprises the following steps: and uniformly mixing the cement with the plain soil, then uniformly mixing the cement with a soil curing agent, and then sequentially carrying out rolling and maintenance to obtain the cured soil.

The third aspect of the invention provides an application of the solidified soil, which is applied to highway subgrade, railway subgrade, dam solidification, building foundation, airport runway solidification and slope fixation.

Examples

In order to better understand the above technical solutions, the following detailed descriptions will be provided with reference to specific embodiments. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention. In addition, the starting materials used are all commercially available, unless otherwise specified.

Example 1

The embodiment 1 of the invention provides a soil solidifying agent, which comprises 23 parts of dispersing agent, 1.2 parts of salt compound, 4 parts of biological enzyme, 0.2 part of micromolecule alcohol and 69 parts of solvent.

The dispersant comprises a methyl naphthalene sulfonate formaldehyde condensate and a phenol sulfonate formaldehyde condensate; the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is 1.9: 1.

the methyl naphthalene sulfonate formaldehyde condensate is purchased from double-ring assistant, llc of ann yang city; the phenolsulfonate formaldehyde condensate was purchased from Basf Tamol DN.

The salt compounds comprise sodium sulfate, sodium formate and sodium acetate; the mass ratio of the sodium sulfate to the sodium formate to the sodium acetate is 1: 0.15: 0.06.

the biological enzymes comprise firmase and thailase; the mass ratio of the firming enzyme to the tylosin is 1: 1.

the firmase was purchased from the american global enzyme products company; the tyrosinases were purchased from Nature Plus, inc.

The small molecular alcohol is methanol.

The solvent is water.

The preparation method of the soil stabilizer comprises the following steps: adding the dispersant, the salt compound, the biological enzyme, the small molecular alcohol and the solvent into a stirrer according to the parts by weight, controlling the temperature at 250 ℃, and uniformly stirring.

Example 2

The embodiment 2 of the invention provides a soil solidifying agent, which comprises 26 parts of dispersing agent, 1.5 parts of salt compound, 5 parts of biological enzyme, 0.3 part of micromolecule alcohol and 70 parts of solvent.

The dispersant comprises a methyl naphthalene sulfonate formaldehyde condensate and a phenol sulfonate formaldehyde condensate; the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is 2.1: 1.

The salt compounds comprise sodium sulfate, sodium formate and sodium acetate; the mass ratio of the sodium sulfate to the sodium formate to the sodium acetate is 1: 0.2: 0.07.

The small molecular alcohol is methanol.

The solvent is water.

The procedure for preparing the soil stabilizer was the same as in example 1.

Example 3

The embodiment 3 of the invention provides a soil solidifying agent, which comprises, by weight, 25 parts of a dispersing agent, 1.3 parts of a salt compound, 4.5 parts of a biological enzyme, 0.25 part of a small molecular alcohol and 69.7 parts of a solvent.

The dispersant comprises a methyl naphthalene sulfonate formaldehyde condensate and a phenol sulfonate formaldehyde condensate; the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is 2: 1.

The salt compounds comprise sodium sulfate, sodium formate and sodium acetate; the mass ratio of the sodium sulfate to the sodium formate to the sodium acetate is 1: 0.17: 0.065.

The small molecular alcohol is methanol.

The solvent is water.

The procedure for preparing the soil stabilizer was the same as in example 1.

Example 4

Example 4 of the present invention provides a soil solidifying agent, which is the same as example 3 in the following detailed description, except that the mass ratio of the methylnaphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is 1: 1.

example 5

Example 5 of the present invention provides a soil stabilizer, which is the same as example 3 except that there is no phenolsulfonate formaldehyde condensate.

Example 6

Example 6 of the present invention provides a soil stabilizer, which is the same as example 3 except that the methyl naphthalene sulfonate formaldehyde condensate is not present.

Example 7

The embodiment 7 of the invention provides a soil solidifying agent, which is the same as the embodiment 3 in the specific implementation manner, and is characterized in that the mass ratio of sodium sulfate to sodium formate to sodium acetate is 1: 0.1: 0.04.

example 8

The embodiment 8 of the invention provides a soil solidifying agent, which is the same as the embodiment 3 in the specific implementation manner, and is characterized in that the mass ratio of sodium sulfate to sodium formate to sodium acetate is 1: 0.25: 0.08.

example 9

The embodiment 9 of the invention provides a soil solidifying agent, which is the same as the embodiment 3 in the specific implementation manner, and is characterized in that the mass ratio of sodium sulfate to sodium formate to sodium acetate is 2: 0.17: 0.065.

example 10

Example 10 of the present invention provides a soil stabilizer, and its detailed description is the same as example 3, except that the sodium sulfate is replaced with calcium chloride.

Example 11

Example 11 of the present invention provides a soil stabilizer, which is the same as example 3 except that no thailase is present.

Example 12

Example 12 of the present invention provides a soil stabilizer, which is similar to example 3 except that no firming enzyme is present.

Example 13

Example 13 of the present invention provides a soil stabilizer, which is the same as example 3 except that 1 part by weight of methanol is used.

Example 14

Example 14 of the present invention provides a soil stabilizer, which is the same as example 3 except that methanol is not contained.

Performance testing

In parking lot engineering, uniformly mixing cement and plain soil, then respectively uniformly mixing the cement and the plain soil with the soil curing agent prepared in the embodiment, and sequentially rolling and maintaining to obtain cured soil, wherein the cement accounts for 10% of the total mass of the cement and the plain soil, the plain soil accounts for 89.98% of the total mass of the cement and the plain soil, and the soil curing agent accounts for 0.02% of the total mass of the cement and the plain soil; the cement is P.O42.5 ordinary portland cement, and the solidified soil without a strengthening agent is used as a control example, and the following performance tests are carried out on the solidified soil; wherein plain soil of the conditions of table 1 was selected as experimental soil:

TABLE 1

The experimental soil is compacted by referring to a method T0804-1994 in JTG E51-2009, the relation between the density and the water content of the experimental soil is measured, so that the maximum dry density and the optimal water content of the experimental soil are determined, and the test results are shown in Table 2:

TABLE 2

The maximum dry density of the experimental soil is 1.92g/cm³The optimum water content is 12.5%.

1. Unconfined compressive strength test

7d unconfined compressive strength tests were performed at the same compaction according to JTG E40-2007 Highway geotechnical test Specification T0148-1993. Wherein, the value of the compressive strength is marked as A when the value is more than or equal to 2.9 MPa; recording the compression strength value of 2.5-2.9 MPa (including 2.5MPa) as B; marking as C when the compressive strength value is 2-2.5 MPa; the compressive strength value of less than or equal to 2MPa is recorded as D.

2. Water resistance stability test

Soaking the prepared solidified soil in water for 3d at room temperature, and calculating the mass loss rate; wherein, the mark A represents that the mass loss rate is less than or equal to 1 percent; marking the mass loss rate of 1-5% (including 5%) as B; marking the mass loss rate of 5-10% as C; the mass loss rate of more than or equal to 10 percent is marked as D.

3. Resistance to wet heat aging test

Carrying out damp-heat aging on the prepared solidified soil for 360h in a Ci series Weather-Ometters xenon lamp aging instrument, and observing whether the solidified soil has the problems of cracks, brittle fracture, deformation and the like or not, wherein if the solidified soil does not have the problems, the solidified soil is marked as 1; if it occurs, it is noted as 2.

4. Freezing resistance test

Performing a freeze resistance test of 28d according to test procedure for inorganic binder stabilizing materials for highway engineering (JTG E51-2009), wherein A is recorded as A, wherein the freeze resistance index is more than or equal to 80, and the mass loss rate is less than or equal to 5%; the antifreeze index is more than or equal to 80, the mass loss rate is more than 5 percent or the antifreeze index is less than 80, and the mass loss rate is less than or equal to 5 percent is marked as B; the antifreeze index is less than 80, and the mass loss rate is more than 5 percent and is recorded as D.

TABLE 3

	Compressive strength	Stability against water	Resistance to wet heat aging	Freezing resistance
					Example 1	A	A	1	A
Example 2	A	A	1	A
					Example 3	A	A	1	A
Example 4	C	C	2	/
					Example 5	C	D	2	/
Example 6	C	C	2	/
					Example 7	B	B	2	C
Example 8	B	B	2	C
					Example 9	B	B	2	D
Example 10	C	C	2	D
					Example 11	B	B	2	B
Example 12	B	B	2	B
					Example 13	B	B	2	C
Example 14	D	D	2	D
					Comparative example	D	D	2	D

In the highway engineering of the high-speed Jingtai, cement and plain soil are uniformly mixed, then the mixture is uniformly mixed with the soil stabilizer prepared in the embodiment 3, and the solidified soil is obtained through rolling and maintenance in sequence, wherein the cement accounts for 8% of the total mass of the cement and the plain soil, the plain soil accounts for 91.98% of the total mass of the cement and the plain soil, and the soil stabilizer accounts for 0.02% of the total mass of the cement and the plain soil and is a test number 1; the cement accounts for 10% of the total mass of the cement and the plain soil, the plain soil accounts for 89.98% of the total mass of the cement and the plain soil, and the soil curing agent accounts for 0.02% of the total mass of the cement and the plain soil, and is the test number 2; the cement accounts for 12% of the total mass of the cement and the plain soil, the plain soil accounts for 87.98% of the total mass of the cement and the plain soil, and the soil curing agent accounts for 0.02% of the total mass of the cement and the plain soil, and is the test number 3; the cement is P.O42.5 ordinary portland cement, and the solidified soil without a strengthening agent is used as a control example, and the following performance tests are carried out on the solidified soil; wherein plain soil of the conditions of table 4 was selected as experimental soil:

TABLE 4

The experimental soil is compacted by referring to a method T0804-1994 in JTG E51-2009, the relationship between the density and the water content of the experimental soil is measured, so that the maximum dry density and the optimal water content of the experimental soil are determined, and the test results are shown in Table 5:

TABLE 5

The maximum dry density of the experimental soil is 1.85g/cm³The optimum water content is 14.9%.

The 7d unconfined compressive strength test was performed at the same compaction level according to JTG E40-2007 Highway geotechnical test Specification T0148-1993 and the test results are as follows:

TABLE 6

Test number	Compressive strength (MPa)
		1	4.94
2	5.86
		3	7.03

The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.

Claims

1. The soil curing agent is characterized by comprising, by weight, 20-30 parts of a dispersing agent, 1-2 parts of a salt compound, 3-6 parts of a biological enzyme, 0.1-0.4 part of a small molecular alcohol and 60-80 parts of a solvent.

2. The soil stabilizer of claim 1, wherein the dispersant is selected from one or more of a methyl naphthalene sulfonate formaldehyde condensate, an amino naphthalene sulfonate formaldehyde condensate, a benzyl naphthalene sulfonate formaldehyde condensate, a wood beta-sodium naphthalene sulfonate formaldehyde condensate, an alpha-sodium naphthalene sulfonate formaldehyde condensate, and a phenol sulfonate formaldehyde condensate.

3. The soil stabilizer according to claim 2, wherein the mass ratio of the methyl naphthalene sulfonate formaldehyde condensate to the phenol sulfonate formaldehyde condensate is (1.5-2.4): 1.

4. the soil solidifying agent according to claim 2 or 3, wherein the content of sulfate in the methyl naphthalene sulfonate formaldehyde condensate is less than or equal to 5%, and the content of calcium and magnesium ions is less than or equal to 4000 ppm; the pH value of the phenol sulfonate formaldehyde condensate in 100g/L aqueous solution at 25 ℃ is 6.05-7.5.

5. The soil stabilizer of claim 1, wherein the salt compound is selected from sodium sulfate, sodium formate, sodium acetate, and calcium chloride.

6. The soil stabilizer of claim 5, wherein the mass ratio of sodium sulfate, sodium formate and sodium acetate is 1: (0.1-0.25): (0.04-0.08).

7. The soil stabilizer of claim 1, wherein the biological enzyme is selected from one or more of beta-amylase, acid cellulase, beta-mannanase, firmase, Palmase and tylanase.

8. The soil solidifying agent according to claim 1, wherein the small molecular alcohol is selected from one or more of methanol, ethylene glycol, propylene glycol, 1, 4-butanediol, 1, 3-butanediol, diethylene glycol, dipropylene glycol, 1, 5-pentanediol, 1, 6-hexanediol, 2-ethylhexanediol, 3-methyl-1, 5-pentanediol, cyclohexane dimethanol, glycerol, trimethylolpropane, pentaerythritol.

9. A solidified soil characterized in that a raw material for preparation comprises the soil stabilizer according to any one of claims 1 to 8.

10. The use of solidified soil according to claim 9, wherein the solidified soil is used for road bed, railway bed, dam solidification, building foundation, airport runway solidification, and slope fixing.