CN115044382A

CN115044382A - Soil curing agent, cured soil and application of soil curing agent

Info

Publication number: CN115044382A
Application number: CN202210964809.0A
Authority: CN
Inventors: 刘泽坤; 刘鹏飞
Original assignee: Zhongding Changxin Shandong Engineering Technology Co ltd
Current assignee: Zhongding Changxin Shandong Engineering Technology Co ltd
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-09-13
Anticipated expiration: 2042-08-12
Also published as: CN115044382B

Abstract

The invention relates to a soil stabilizer, solidified soil and application thereof, wherein the soil stabilizer comprises 15-20 parts of modified water glass, 10-20 parts of sulfonated oil, 3-5 parts of oleamide, 5-8 parts of triisopropanolamine, 1-2 parts of inorganic salt, 1-3 parts of an expanding agent, 2-3 parts of a pore sealing agent and 40-60 parts of water. The modified water glass can prolong the shelf life and enhance the compressive strength of the solidified soil, the sulfonated oil can simultaneously enhance the compressive strength and the water stability of the solidified soil, the oleamide and the triisopropanolamine can interact with inorganic salt to block the adsorption of water on the soil surface, and the agglomeration effect among tiny soil particles is enhanced. The expanding agent can prevent cracks from being generated, the density and the strength of the solidified soil are higher, and the pore sealing agent can further enhance the water stability of the solidified soil. In addition, the soil curing agent provided by the invention can improve the anti-permeability and anti-freezing properties of soil.

Description

Soil curing agent, cured soil and application thereof

Technical Field

The invention relates to the technical field of curing agents, and particularly relates to a soil curing agent, cured soil and application thereof.

Background

Structures such as buildings have certain mechanical property requirements on foundation soil, however, in the actual construction process, not all the soil can meet the design requirements. In order to improve the performance of soil, a soil curing agent is developed. The soil stabilizer is a novel energy-saving and environment-friendly engineering material synthesized by various materials and used for curing various soils, and is widely applied to the fields of traffic, airports, ports, water conservancy, environment and the like. The soil curing agent is adopted for reinforcement, so that natural soil can be directly utilized, materials are convenient to obtain, the exploitation and transportation of stones and the like are greatly reduced, the cost is reduced, and the soil curing agent has more excellent performance, economic benefit and environmental benefit compared with the traditional materials such as cement, lime and the like. In addition, the soil stabilizer also has the advantages of high curing speed, high early strength, small using amount and the like, and can save construction time and reduce construction cost. However, the current soil firming agents still have the following disadvantages:

firstly, the compressive strength of soil reinforced with soil solidifying agents is generally low. Secondly, the building structure is difficult to avoid raining, underground water level rising and the like, however, because the water stability of the soil reinforced by the soil curing agent is insufficient, a series of damages can occur after the water content of the soil body is increased, and the safety of engineering is influenced.

The research and development of a novel soil curing agent with better performance can bring important economic and social benefits, promote the development of the reinforcement technology and enlarge the application range and the application scale of the reinforcement technology. Therefore, it is necessary to provide a soil stabilizer having higher strength and higher water stability.

Disclosure of Invention

Technical problem to be solved

In view of the technical problems, the invention provides a soil stabilizer, a solidified soil and application thereof, aiming at solving the problems of insufficient soil strength and water-resistant stability after the soil stabilizer is reinforced in the prior art.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

in a first aspect, the invention provides a soil curing agent which comprises, by weight, 15-20 parts of modified water glass, 10-20 parts of sulfonated oil, 3-5 parts of oleamide, 5-8 parts of triisopropanolamine, 1-2 parts of inorganic salt, 1-3 parts of an expanding agent, 2-3 parts of a pore sealing agent and 40-60 parts of water.

The soil stabilizer comprises, by weight, 17-20 parts of modified water glass, 14-18 parts of sulfonated oil, 4-5 parts of oleamide, 6-7 parts of triisopropanolamine, 1.5-2 parts of inorganic salt, 2-3 parts of an expanding agent, 2.5-3 parts of a pore sealing agent and 50-60 parts of water.

The soil stabilizer as described above preferably includes, by weight, 17 parts of modified water glass, 14 parts of sulfonated oil, 4 parts of oleamide, 6 parts of triisopropanolamine, 1.5 parts of inorganic salt, 2 parts of swelling agent, 2.5 parts of pore blocking agent, and 53 parts of water.

The soil stabilizer as described above, preferably, the modified water glass is water glass heated at 35-50 ℃.

The soil stabilizer as described above, preferably, the modified water glass is a mixture of potassium metasilicate and water glass;

the potassium metasilicate accounts for 25-35% of the weight of the modified water glass.

The soil stabilizer as described above, preferably, the inorganic salt is one or more of sodium sulfate, ferric sulfate, sodium chloride or calcium chloride.

The soil stabilizer as described above, preferably, the swelling agent is calcium aluminum sulfate.

The soil curing agent is preferably a silane compound, and includes one or more of a silane coupling agent KH550 and a silane coupling agent 560.

In a second aspect, the present invention provides a solidified soil formed from the soil solidifying agent according to the above aspect, comprising, by weight, 0.02 to 0.04 parts of the soil solidifying agent, 5 to 10 parts of cement, and the balance soil. The preparation method of the solidified soil comprises the following steps: uniformly mixing soil and cement, adding a soil curing agent into a mixture of the soil and the cement, uniformly stirring, and sequentially carrying out rolling, forming, demolding and maintaining to obtain the cured soil.

The solidified soil can obtain the compressive strength of 8MPa or more in 7 days and 14 days, and can meet the compressive index requirement of actual construction of roads. The solidified soil still has higher compressive strength after undergoing a plurality of dry and wet cycles, and the mass loss before and after runoff washing is small, so the solidified soil has excellent water stability. In addition, the solidified soil also has good impermeability, the compressive strength after repeated freezing and thawing can reach 8MPa, and the solidified soil has strong freezing resistance. Therefore, the solidified soil can be used for highway subgrade, railway subgrade, dam solidification, building foundation, airport runway solidification and side slope fixation, and has higher practical value and wide application prospect.

In a third aspect, the invention also provides an application of the solidified soil, wherein the solidified soil is used for highway subgrade, railway subgrade, dam solidification, building foundation, airport runway solidification and slope fixation. The application method of the solidified soil comprises the following steps: and paving the solidified soil on the ground as a roadbed, rolling, and paving asphalt or cement concrete on the surface of the roadbed.

The solidified soil is used in the field, can provide enough strength for corresponding road surfaces or buildings, reduces the burden of the road surfaces, improves the use condition of the road surfaces, is less influenced by natural environments such as frost and humidity, can prolong the service life of the road or the building, and saves the maintenance cost.

(III) advantageous effects

The invention provides a novel soil curing agent, which comprises modified water glass, sulfonated oil, oleamide, triisopropanolamine, inorganic salt, an expanding agent, a pore sealing agent and solvent water.

The aging speed of the modified water glass is greatly reduced, so that the soil stabilizer can be stored for a long time and has a long quality guarantee period. In addition, compared with common water glass, the modified water glass can further improve the curing effect of the soil curing agent, so that the compressive strength of the cured soil is greatly improved.

The sulfonated oil has strong permeability and good filling property, can reduce the thickness of the combined water film adsorbed on the surface of soil particles, gather the soil particles, improve the water stability of the soil, and simultaneously improve the compressive strength and the water stability of the solidified soil.

The oleamide and the triisopropanolamine can mutually cooperate with inorganic salts in a soil curing agent and are adsorbed on the surface of soil particles, so that the water adsorption on the surface of the soil is blocked, the ion exchange with the soil can be carried out, the potential of the soil is changed, the agglomeration effect among tiny soil particles is enhanced, the pores among the cured soil are reduced, and the action area of the water is further reduced.

The expanding agent can compensate the prestress generated in the curing and shrinking process of soil, prevent cracks from being generated, fill soil gaps, reduce the porosity of the cured soil and enable the density and the strength of the cured soil to be higher.

The pore sealing agent can prevent water from entering gaps and pores of the solidified soil, and can enhance the water stability of the solidified soil.

Therefore, the soil curing agent disclosed by the invention is long in quality guarantee time, and the compressive strength, the water stability and the freezing resistance of the cured soil can be greatly improved.

The solidified soil prepared by mixing the soil solidifying agent, cement and soil has high compressive strength, good water stability and strong freeze-thaw resistance, can meet the requirements of road building, building foundation, dam solidification and the like, and has higher practical value and wide application prospect.

Detailed Description

For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to specific embodiments.

The invention provides a soil curing agent which comprises, by weight, 15-20 parts of modified water glass, 10-20 parts of sulfonated oil, 3-5 parts of oleamide, 5-8 parts of triisopropanolamine, 1-2 parts of inorganic salt, 1-3 parts of an expanding agent, 2-3 parts of a pore sealing agent and 40-60 parts of water.

In order to ensure the excellent effect of the soil stabilizer, the composition is preferably 17-20 parts of modified water glass, 14-18 parts of sulfonated oil, 4-5 parts of oleamide, 6-7 parts of triisopropanolamine, 1.5-2 parts of inorganic salt, 2-3 parts of expanding agent, 2.5-3 parts of pore sealing agent and 50-60 parts of water.

To further ensure the using effect of the soil stabilizer, the above-mentioned composition preferably includes 17 parts of modified water glass, 14 parts of sulfonated oil, 4 parts of oleamide, 6 parts of triisopropanolamine, 1.5 parts of inorganic salt, 2 parts of swelling agent, 2.5 parts of pore blocking agent and 53 parts of water.

The preparation method of the modified water glass comprises two preparation methods, wherein the first method is to heat the water glass at 35-50 ℃ to achieve the purpose of modification. The second method is to mix potassium metasilicate with water glass to obtain modified water glass, and in order to ensure the modification effect, the addition amount of the potassium metasilicate is 25-35% of the total weight of the modified water glass.

According to the conventional research, the silicic acid in the water glass solution is subjected to polycondensation reaction with the increase of the storage time, and polysilicic acid colloidal particles with larger sizes are generated, so that the bonding strength of the water glass is reduced by about 1/3.

After the heating modification, the binding capacity of the water glass can be maintained at a high level for a long time without reducing along with the increase of time. In addition, after the water glass is heated and modified, the bonding capacity of the water glass is further improved, and the concrete expression is that the compressive strength of the solidified soil is improved.

The heating can maintain the binding capacity of the water glass at a high level for a long time because: the heating provides energy for the water glass, so that the polysilicic acid colloid particles with larger sizes are depolymerized, more small-particle silicic acid is generated, and the aging of the water glass is eliminated. Furthermore, the modified water glass can generate more gels with quartz, partial mineral substances and the like in soil, the gels are coated outside soil particles or filled in gaps/pores of the soil, a stronger curing effect is achieved, and the compressive strength of the cured soil is further improved.

The active ingredients of the water glass in the general sense are sodium silicate, so the active ingredients of the water glass refer to the sodium silicate. The principle of modifying the water glass by the potassium metasilicate is as follows: compared with sodium ions, potassium ions have stronger polymer forming capability, when sodium silicate is added into potassium water glass, the original polysilicic acid system balance of the sodium silicate can be broken, and the polysilicic acid is depolymerized to form more small-size particles, so that the colloid is refined, and the purpose of eliminating aging is achieved. In a similar way, due to the increase of the number of the small-size particles, the modified water glass can generate more gels, and a better curing effect is achieved. The modified water glass can be directly prepared with other soil curing agent raw materials into a liquid soil curing agent after modification and stored. In addition, in order to ensure that the soil curing agent has stronger curing capability and lower aging degree, the water glass can be modified on site before soil curing construction.

The sulfonated oil has the functions of moistening, emulsifying, dispersing and the like, and can form stable emulsion with a solvent, namely water, in the soil curing agent. The sulfonated oil has strong permeability and good filling property, and can compact the soil. The sulfonated oil ionizes a large amount of hydrogen ions and hydroxyl ions in water, the ions react with charges on the surfaces of the soil particles, and the thickness of double electric layers on the surfaces of the soil particles is reduced, so that the adsorption capacity of the soil particles on water is reduced, the thickness of a combined water film adsorbed on the surfaces of the soil particles is reduced, and the soil particles are gathered. The hydrophilic group of the sulfonated oil is combined with soil particles, and the lipophilic group at the other end is outward, so that the soil particles are changed from original hydrophilic to hydrophobic, and part of absorbed water is discharged, and the reaction is irreversible, so that the water stability of the soil can be thoroughly improved, and the original mineral lattice structure of the soil cannot be decomposed and damaged. When the invention is used for solidifying soil, a certain amount of cement is also added, and the cement generates chemical reaction under the action of water to generate gelatinous hydrate to solidify the soil. The sulfonated oil and the cement have synergistic effect, so that the compressive strength of the solidified soil is greatly improved, and the water stability of the solidified soil can be improved simultaneously.

Oleic acid amide and triisopropanolamine can with sodium sulfate, ferric sulfate, sodium chloride, calcium chloride in one kind or several kinds of inorganic salts synergistic action each other, adsorb on the surface of soil particle, can block water adsorption on the one hand and take place ion exchange with soil on the other hand, change the electric potential of soil, strengthen the cohesion between the small soil particle, and reduce the hole between the solidification soil, further reduce the active area of water, make the capillary permeability of soil slow and reduce, with the impervious performance that improves the solidification soil, and then make the freeze proof ability of solidification soil obtain promoting.

The expanding agent is preferably calcium aluminum sulfate, and mainly has the function of compensating the prestress generated in the curing shrinkage process of the soil and preventing the cured soil from generating cracks. In addition, the aluminum calcium sulfate expanding agent can fill gaps among soil particles, reduce the porosity of the solidified soil and enable the density and the compressive strength of the solidified soil to be higher.

The pore blocking agent is a silane compound and comprises one or more of a silane coupling agent KH550 and a silane coupling agent 560. The pore sealing agent is used for preventing water from entering gaps and pores of the solidified soil, and further enhancing the water stability of the solidified soil.

In order to further clarify the aspects of the present invention and the technical advancement thereof, the following description will be given with reference to specific examples and technical effects.

Example 1

The embodiment provides a soil curing agent which comprises, by weight, 17 parts of modified water glass, 14 parts of sulfonated oil, 4 parts of oleamide, 6 parts of triisopropanolamine, 1.5 parts of inorganic salt, 2 parts of aluminum calcium sulfate, 2.5 parts of a silane coupling agent KH550 and 53 parts of water.

Wherein the modified water glass is water glass after being heated at 40 ℃.

The inorganic salt comprises the following components in percentage by mass: 1 iron sulfate and calcium chloride.

Example 2

This example provides a soil stabilizer, which is different from example 1 in that water glass is subjected to heat modification treatment at 35 ℃.

Example 3

This example provides a soil stabilizer, which is different from example 1 in that water glass is subjected to heat modification treatment at 50 ℃.

Example 4

This example provides a soil stabilizer which differs from example 1 in that water glass is modified by the addition of potassium metasilicate, specifically, potassium metasilicate is added in an amount of 25% by weight of the modified water glass.

Example 5

This example provides a soil stabilizer which differs from example 1 in that water glass is modified by the addition of potassium metasilicate, specifically, potassium metasilicate is added in an amount of 35% by weight of the modified water glass.

Example 6

This example provides a soil solidifying agent comprising 19 parts of modified water glass, 13 parts of sulfonated oil, 5 parts of oleamide, 7 parts of triisopropanolamine, 1.5 parts of an inorganic salt, 3 parts of calcium aluminum sulfate, 2.5 parts of a silane coupling agent KH550, and 50 parts of water.

Example 7

This example provides a soil solidifying agent, including 15 parts of modified water glass, 18 parts of sulfonated oil, 4 parts of oleamide, 5 parts of triisopropanolamine, 1 part of inorganic salt, 2 parts of calcium aluminum sulfate, 3 parts of silane coupling agent KH550, and 52 parts of water.

Example 8

The embodiment provides a soil curing agent, which comprises 17 parts of modified water glass, 20 parts of sulfonated oil, 5 parts of oleamide, 6 parts of triisopropanolamine, 1 part of inorganic salt, 3 parts of calcium aluminum sulfate, 3 parts of a silane coupling agent KH550 and 45 parts of water.

Example 9

This example provides a soil solidifying agent, including 18 parts of modified water glass, 14 parts of sulfonated oil, 5 parts of oleamide, 8 parts of triisopropanolamine, 2 parts of inorganic salt, 2 parts of calcium aluminum sulfate, 2 parts of silane coupling agent KH550, and 49 parts of water.

Example 10

This example provides a soil solidifying agent, including 20 parts of modified water glass, 20 parts of sulfonated oil, 5 parts of oleamide, 8 parts of triisopropanolamine, 2 parts of sodium sulfate, 3 parts of calcium aluminum sulfate, 2 parts of silane coupling agent 560, and 40 parts of water.

Example 11

This example provides a soil solidifying agent, including 16 parts of modified water glass, 10 parts of sulfonated oil, 3 parts of oleamide, 6 parts of triisopropanolamine, 2 parts of sodium chloride, 1 part of calcium aluminum sulfate, 1 part of silane coupling agent KH550, 1 part of silane coupling agent 560, and 60 parts of water.

Comparative example 1

This comparative example provides a soil stabilizer, which is different from example 1 in that the modified water glass is replaced with water glass which has not been subjected to any modification treatment.

Comparative example 2

The comparative example provides a soil stabilizer, which is different from example 1 in that 1 part of oleamide and 2 parts of triisopropanolamine are contained in the raw material ratio.

Comparative example 3

This comparative example provides a soil solidifying agent, which is different from example 1 in that the addition amount of the sulfonated oil is 5 parts and the addition amount of the pore blocking agent is 0.

Comparative example 4

This comparative example provides a soil stabilizer, which is different from example 1 in that triisopropanolamine was added in an amount of 8 parts and oleamide was added in an amount of 0 part.

Comparative example 5

This comparative example provides a soil stabilizer, which is different from example 1 in that oleamide was added in an amount of 6 parts and triisopropanolamine was added in an amount of 0 part.

Comparative example 6

This comparative example provides a soil stabilizer, which is different from example 1 in that the addition amount of the inorganic salt is 0.

Uniformly mixing the plain soil and the cement, adding the soil curing agents of the examples 1-11 and the comparative examples 1-6 into a plurality of groups of plain soil-cement mixtures, uniformly stirring, and sequentially carrying out rolling, forming, demolding and maintaining to obtain 17 groups of cured soil, wherein the 17 groups of cured soil are respectively marked as a product 1-a product 11 and a reference product 1-a reference product 6. Wherein the weight ratio of the cement to the plain soil to the soil curing agent is 10: 89.98: 0.02. in the raw materials, P.O42.5 ordinary Portland cement is selected, the plain soil is collected from a newly-built highway planning place planned in the suburb of the Shandong Weifang and collected on site and then sealed, and the specific components are shown in Table 1.

TABLE 1 composition of the plain soil

It should be noted that, in the specific implementation, the sulfonated oil should be dissolved in water in advance, fully ionized, and fully mixed with the other ingredients after being fully ionized to prepare the soil stabilizer.

Testing one: test for compressive Strength

The test was carried out strictly in accordance with the test protocol for inorganic binder-stabilized materials for road engineering (JTG E51-2009). And (5) maintaining for 14 days in a standard curing room, and taking unconfined compressive strength of 7 days and 14 days as the compressive strength index. The compressive strength was tested with reference to GB/T16925-1997 and the compressive strength of the product as well as the control is shown in Table 2.

TABLE 2 compression Strength test results of the test pieces of examples and comparative examples

As can be seen from Table 2, the soil stabilizer of examples 1 to 11 can provide high unconfined compressive strength for the plain soil at 7 days and 14 days. The compressive strength of the control of comparative examples 1-2 was significantly reduced compared to products 1-11. In the control 1, the water glass component in the soil stabilizer is not modified, the amount of generated gel is less, and the gel cannot be filled in the gaps of soil particles more, so that the compressive strength is reduced. In comparative example 2, the addition amount of oleamide and triisopropanolamine in the soil stabilizer was small, and the aggregation between fine soil particles was weakened, so that the compressive strength was reduced. The compressive strength of the reference 4 without the oleamide, the reference 5 without the triisopropanolamine and the reference 6 without the inorganic salt is at a lower level, which shows that the three components of the oleamide, the triisopropanolamine and the inorganic salt play a synergistic role, but the three components are not essential.

Generally speaking, in actual construction, the unconfined compressive strength obtained in a laboratory needs to be about 30% higher than the actual compressive strength index value of a highway, so that the compressive strength of the highway constructed in actual construction can meet the requirement. According to the test results, the soil stabilizer provided by the invention can completely meet the requirement of compression resistance index of actual construction of a highway.

And (2) testing: water stability test

(1) And (3) soaking test: and (3) putting the product 1-11 (maintaining for 14 days) and a compacted plain soil test piece with the same size as the product into normal-temperature water for soaking for 12 hours, taking out the test piece, and naturally drying for 12 hours, wherein the operation is recorded as 1 dry-wet cycle. After the above test pieces underwent 5 dry-wet cycles, the compressive strength of the test pieces and the compressive strength before the dry-wet cycle were tested to obtain table 3.

TABLE 3 comparison of the strength of the test pieces before and after the immersion test

(2) Water stability test under runoff washout conditions: the products 1-11 and the plain soil test piece were continuously washed for 60min at a constant water flow rate, and when the water content of the test piece before washing was recovered, the mass loss rate before and after washing was recorded, and the results are shown in table 4.

TABLE 4 quality loss of test pieces before and after runoff washout

As can be seen from Table 3, after 5 dry and wet cycles, the compressive strength of the products 1-11 can be substantially maintained above 85% of the original compressive strength, and some excellent products can reach above 90%. The plain soil is cracked in the process of dry and wet circulation, and no relevant data is recorded.

As can be seen from Table 4, the mass loss of the soil bodies of the products 1 to 11 is kept in a lower range after the products are subjected to runoff flushing for 60 min. Similarly, the quality loss of the plain soil in the runoff scouring process is visually obvious, and related data are not recorded temporarily.

Therefore, the soil stabilizer of the present invention has excellent water stability.

And (3) testing: test for Freeze resistance

Setting the freezing temperature to-10 deg.C and the melting temperature to 40 deg.C, respectively freezing products 1-11 and reference substances 1-6 for 12h and melting for 12h, and performing 3 times of repeated freezing and thawing in constant temperature equipment without water. The compressive strength of the test pieces after each freeze-thaw was recorded separately to obtain table 5.

TABLE 5 compressive Strength Change (in MPa) of product and control after Each freeze thaw

As can be seen from Table 5, products 1 to 11 all maintained high freeze resistance after undergoing 3 freeze-thaw cycles. The frost resistance of the comparison product 2 is obviously lower than that of the products 1-11, probably because the addition amounts of oleamide and triisopropanolamine are less, and the impermeability can not be improved better, so that the frost resistance is also obviously reduced. The freezing resistance of the control products 4-6 was low because the synergistic effect of oleamide, triisopropanol and inorganic salts was not exhibited, and the anti-permeability was poor, so that the freezing resistance was at a low level and was significantly reduced with the increase of the number of freeze-thaw cycles.

The performance tests show that the cured soil prepared from the soil curing agent, the cement and the soil has excellent compressive strength, water stability, impermeability and frost resistance. Furthermore, the solidified soil can be paved on the ground as a roadbed and rolled, and then asphalt or cement concrete is paved on the surface of the roadbed for highway roadbed, railway roadbed, dam solidification, building foundation, airport runway solidification and side slope fixation, so that sufficient strength is provided, the road surface burden is reduced, the service condition of the road surface is improved, the service life is prolonged, and the maintenance cost is saved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The soil curing agent is characterized by comprising, by weight, 15-20 parts of modified water glass, 10-20 parts of sulfonated oil, 3-5 parts of oleamide, 5-8 parts of triisopropanolamine, 1-2 parts of inorganic salt, 1-3 parts of an expanding agent, 2-3 parts of a pore sealing agent and 40-60 parts of water.

2. The soil stabilizer according to claim 1, wherein the soil stabilizer comprises, by weight, 17-20 parts of modified water glass, 14-18 parts of sulfonated oil, 4-5 parts of oleamide, 6-7 parts of triisopropanolamine, 1.5-2 parts of an inorganic salt, 2-3 parts of an expanding agent, 2.5-3 parts of a pore blocking agent, and 50-60 parts of water.

3. The soil stabilizer according to claim 2, wherein the soil stabilizer comprises 17 parts of modified water glass, 14 parts of sulfonated oil, 4 parts of oleamide, 6 parts of triisopropanolamine, 1.5 parts of inorganic salt, 2 parts of an expanding agent, 2.5 parts of a pore blocking agent, and 53 parts of water by weight.

4. The soil stabilizer according to claim 1, wherein the modified water glass is water glass heated at 35-50 ℃.

5. The soil stabilizer of claim 1, wherein the modified water glass is a mixture of potassium metasilicate and water glass;

6. The soil stabilizer of claim 1, wherein the inorganic salt is one or more of sodium sulfate, ferric sulfate, sodium chloride or calcium chloride.

7. The soil stabilizer of claim 1, wherein the swelling agent is calcium aluminum sulfate.

8. The soil curing agent of claim 1, wherein the pore blocking agent is a silane compound and comprises one or more of a silane coupling agent KH550 and a silane coupling agent 560.

9. A solidified soil comprising, by weight, 0.02 to 0.04 parts of the soil solidifying agent according to any one of claims 1 to 8, 5 to 10 parts of cement, and the balance being soil.

10. Use of the solidified soil of claim 9 for highway foundations, railway foundations, dam solidifications, building foundations, airport runway solidifications, and slope fixations.