Soil stabilizer based on bionic principle and application and application method thereof

Abstract

The invention belongs to the technical field of curing agents, and provides a soil curing agent based on a bionic principle and application and an application method thereof. The soil stabilizer is prepared from the following raw materials: sodium alginate, quaternized chitosan, a silane coupling agent and water. The ratio of the total mass of the sodium alginate and the quaternized chitosan to the mass of the silane coupling agent to the water is (18-22): (0.15-0.25): (45-55). On the basis of the principle that sodium alginate, quaternized chitosan and water are combined to form a composite electrolyte gel, a silane coupling agent is added to form a three-dimensional network structure, and the strength of the polyelectrolyte composite hydrogel is improved; the Yellow River soil is used, and the bionic latex does not need to be combined with regenerated powder, fine aggregate and coarse aggregate; the soil stabilizer can be prepared by site construction, the operation is simple, the bionic electrolyte composite hydrogel is green, pollution-free, carbon-free and biodegradable, and the problem of environmental pollution can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of curing agents, and in particular to a soil curing agent based on a bionic principle and an application and an application method thereof. Background Art

[0002] In the Chinese patent application number 202510014850.5, "A method for preparing cement-free concrete using biomimetic polymers", the biomimetic polymer emulsion is a high-bonding biomimetic polymer prepared from quaternized chitosan and sodium alginate. The quaternized chitosan and sodium alginate are added to deionized water and mechanically stirred at 130-180°C. The mixer speed is 100-200 r / min. After stirring evenly, the mixture is poured out and placed at 60-90°C for 2-4 hours. Industrial waste and construction waste are screened to form recycled powder, fine aggregate and coarse aggregate, which partially or completely replace cement and natural sand and gravel aggregate to produce recycled concrete.

[0003] The above patent has the following problems: (1) The preparation of biomimetic polymer emulsion requires temperature and time conditions, such as stirring at 130-180°C, static at 60-90°C, and placement for 2-4 hours. (2) After demoulding, concrete needs to be cured at 60-90°C. In actual construction, it is difficult to achieve such curing conditions at the construction site. (3) If the construction site does not have experimental conditions, after preparation at a commercial mixing station, the transport vehicle needs to meet temperature conditions during transportation, which also poses a problem. The reasons for the above problems are: (1) When quaternized chitosan and sodium alginate are added to deionized water at room temperature, they will immediately form a composite electrolyte gel that cannot be combined with recycled powder, fine aggregate and coarse aggregate. Therefore, the solution needs to be prepared at high temperature and remain active before combining with recycled powder, fine aggregate and coarse aggregate. (2) High temperature curing may be because the high temperature stimulates the substances in the recycled powder, fine aggregate and coarse aggregate, resulting in increased strength.

[0004] Therefore, it is of great significance to provide a soil solidifier based on biomimetic principles that is prepared and cured at room temperature and has improved strength, and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a soil solidifying agent based on bionic principles and its application and application method in response to the deficiencies of the prior art.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] The present invention provides a soil solidifying agent based on bionic principles, wherein the soil solidifying agent comprises the following raw materials: sodium alginate, quaternized chitosan, a silane coupling agent, and water;

[0008] The mass ratio of the total mass of sodium alginate and quaternized chitosan, the silane coupling agent and water is 18-22:0.15-0.25:45-55.

[0009] Preferably, the mass ratio of the sodium alginate to the quaternized chitosan is 1:1-6.

[0010] Preferably, the mass ratio of the total mass of the sodium alginate and the quaternized chitosan, the silane coupling agent and the water is 20:0.2:50.

[0011] The present invention also provides the application of the soil solidifying agent based on the bionic principle in solidifying soil.

[0012] The present invention also provides an application method of the soil solidifying agent based on the bionic principle, comprising the following steps:

[0013] 1) mixing sodium alginate, quaternized chitosan, Yellow River soil, a silane coupling agent and water to form a composite hydrogel;

[0014] 2) The composite hydrogel is pressed, and the surface of the pressed product is sprayed with water and then cured to obtain a soil solidifying agent based on the bionic principle.

[0015] Preferably, in step 1), the mass ratio of the Yellow River soil to water is 75-85:45-55.

[0016] Preferably, the pressing pressure in step 2) is 48 to 52 kg, and the pressing time is 22 to 26 hours.

[0017] Preferably, the curing temperature in step 2) is room temperature, and the curing time is 5 to 7 days.

[0018] Preferably, the specific process of the mixing in step 1) is: mixing sodium alginate, quaternized chitosan and Yellow River soil to obtain a mixture; mixing a silane coupling agent and water to obtain a silane coupling agent solution; and mixing the silane coupling agent solution and the mixture.

[0019] The beneficial effects of the present invention include the following:

[0020] 1) Based on the principle of forming a composite electrolyte gel by combining sodium alginate, quaternized chitosan and water, the present invention adds a silane coupling agent to form a polyelectrolyte composite hydrogel with a three-dimensional network structure and improved strength; the present invention uses Yellow River soil, and the biomimetic latex does not need to be combined with recycled powder, fine aggregate and coarse aggregate.

[0021] 2) The soil solidifier of the present invention can be produced on-site and is easy to operate. It can be directly mixed and stirred at room temperature to form a composite hydrogel. The existing patent "A method for preparing cement-free concrete using biomimetic polymers" requires strict control of temperature and time conditions.

[0022] 3) The present invention can be cured in a room temperature and can be cured at the construction site. On the first day of curing, a proper amount of water is sprayed on the surface of the test block. On the seventh day, the strength reaches the highest, meeting the actual needs of the project; there is no need to cure at a higher temperature.

[0023] 4) The biomimetic electrolyte composite hydrogel of the present invention is green, pollution-free, carbon-free, and biodegradable, thus addressing environmental pollution issues. The soil solidifier of the present invention has excellent water retention. Compacted soil with the soil solidifier forms a dense waterproof layer, which prevents water from penetrating the foundation during rainy weather and causing uneven settlement.

[0024] 5) The sodium alginate and quaternized chitosan of the present invention are used to prepare a soil solidifier, while the existing patent "A method for preparing cement-free concrete using biomimetic polymers" is used to prepare concrete. DETAILED DESCRIPTION

[0025] The present invention provides a soil solidifying agent based on bionic principles, wherein the soil solidifying agent comprises the following raw materials: sodium alginate, quaternized chitosan, a silane coupling agent, and water;

[0026] The mass ratio of the total mass of sodium alginate and quaternized chitosan, the silane coupling agent and water is 18-22:0.15-0.25:45-55.

[0027] In the soil solidifier of the present invention, the mass ratio of the total mass of sodium alginate and quaternized chitosan, the silane coupling agent and water is preferably 19-21:0.17-0.23:47-53, more preferably 19.5-20.5:0.19-0.21:49-51, and even more preferably 20:0.2:50.

[0028] In the present invention, the mass ratio of the sodium alginate to the quaternized chitosan is preferably 1:1-6, more preferably 1:2-5, and even more preferably 1:3-4.

[0029] In the present invention, the molecular weight of the quaternized chitosan is preferably 60 to 100 kDa, more preferably 80 kDa; the molecular weight of the sodium alginate is preferably 100 to 160 kDa, more preferably 120 to 140 kDa; the silane coupling agent is preferably an aminosilane coupling agent, a mercaptosilane coupling agent, a vinylsilane coupling agent or an epoxysilane coupling agent, the aminosilane coupling agent is preferably γ-aminopropyltriethoxysilane, the mercaptosilane coupling agent is preferably γ-mercaptopropyltrimethoxysilane, the vinylsilane coupling agent is preferably vinyltriethoxysilane, and the epoxysilane coupling agent is preferably γ-glycidoxypropyltrimethoxysilane.

[0030] The present invention also provides the application of the soil solidifying agent based on the bionic principle in solidifying soil.

[0031] The present invention also provides an application method of the soil solidifying agent based on the bionic principle, comprising the following steps:

[0032] 1) mixing sodium alginate, quaternized chitosan, Yellow River soil, a silane coupling agent and water to form a composite hydrogel;

[0033] 2) The composite hydrogel is pressed, and the surface of the pressed product is sprayed with water and then cured to obtain a soil solidifying agent based on the bionic principle.

[0034] In the present invention, the mass ratio of the Yellow River soil and water in step 1) is preferably 75-85:45-55, more preferably 77-83:47-53, and even more preferably 80:50.

[0035] In the present invention, the pressing pressure in step 2) is preferably 48 to 52 kg, more preferably 49 to 51 kg, and more preferably 50 kg; the pressing time is preferably 22 to 26 h, more preferably 23 to 25 h, and more preferably 24 h.

[0036] In the present invention, the curing temperature in step 2) is preferably room temperature, and the curing time is preferably 5 to 7 days, more preferably 5.5 to 6.5 days, and even more preferably 6 days.

[0037] In the present invention, the specific process of mixing in step 1) is preferably: mixing sodium alginate, quaternized chitosan and Yellow River soil to obtain a mixture; mixing a silane coupling agent and water to obtain a silane coupling agent solution; and mixing the silane coupling agent solution and the mixture.

[0038] The technical solutions provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0039] In the embodiment, the stirring speed is 100 r / min; the mold is a 20 mm×20 mm×20 mm cast iron six-joint test block mold; the molecular weight of quaternized chitosan is 80 kDa, and the molecular weight of sodium alginate is 120 kDa.

[0040] Example 1

[0041] Sodium alginate and quaternized chitosan were directly mixed with Yellow River soil to form a mixture. A silane coupling agent solution (γ-aminopropyltriethoxysilane) mixed with water was then added to the mixture and stirred evenly to form a composite hydrogel. The mass ratio of the combined mass of sodium alginate and quaternized chitosan, Yellow River soil, silane coupling agent, and water was 20:80:0.2:50, and the mass ratio of sodium alginate to quaternized chitosan was 1:1. The composite hydrogel was placed in a mold and pressed under a pressure of 50 kg for 24 hours. After pressing, the mold was removed and the surface of the pressed product was sprayed with water (using a fine-hole watering can, spraying three times until the sample surface was moist). The product was then cured in a room temperature chamber for 6 days to obtain the solidified soil.

[0042] The strength of the solidified soil in this embodiment is 9.5 MPa.

[0043] Example 2

[0044] The “mass ratio of sodium alginate and quaternized chitosan is 1:1” in Example 1 was changed to “the mass ratio of sodium alginate and quaternized chitosan is changed to 1:2”, and other conditions were the same as in Example 1.

[0045] The strength of the solidified soil in this embodiment is 10.6 MPa.

[0046] Example 3

[0047] The “mass ratio of sodium alginate and quaternized chitosan is 1:1” in Example 1 was changed to “the mass ratio of sodium alginate and quaternized chitosan is changed to 1:3”, and other conditions were the same as in Example 1.

[0048] The strength of the solidified soil in this embodiment is 11.1 MPa.

[0049] Example 4

[0050] The “mass ratio of sodium alginate and quaternized chitosan is 1:1” in Example 1 was changed to “the mass ratio of sodium alginate and quaternized chitosan is changed to 1:4”, and other conditions were the same as in Example 1.

[0051] The strength of the solidified soil in this embodiment is 12.2 MPa.

[0052] Example 5

[0053] The “mass ratio of sodium alginate and quaternized chitosan is 1:1” in Example 1 was changed to “the mass ratio of sodium alginate and quaternized chitosan is 1:5”, and other conditions were the same as in Example 1.

[0054] The strength of the solidified soil in this embodiment is 14.3 MPa.

[0055] The present invention uses sodium alginate, quaternized chitosan, and a silane coupling agent as curing agent raw materials to treat Yellow River soil. The preparation process and curing conditions of the present invention do not need to be carried out under high temperature and complex conditions. Compared with traditional curing agents, the soil curing agent of the present invention does not require strict preparation conditions and can be produced on the construction site. It is green, pollution-free, and biodegradable. After the soil curing agent of the present invention is cured, the soil reaches its maximum strength in 7 days and the strength does not decrease within 7 to 28 days.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A soil solidifier based on bionic principles, characterized in that: The soil solidifying agent comprises the following raw materials: sodium alginate, quaternized chitosan, silane coupling agent, and water; The mass ratio of the total mass of sodium alginate and quaternized chitosan, the silane coupling agent and water is 18-22:0.15-0.25:45-55.

2. The soil solidifying agent according to claim 1, characterized in that The mass ratio of the sodium alginate to the quaternized chitosan is 1:1-6.

3. The soil solidifying agent according to claim 1 or 2, characterized in that The mass ratio of the total mass of the sodium alginate and the quaternized chitosan, the silane coupling agent and water is 20:0.2:

50.

4. Use of the soil solidifier based on the bionic principle according to any one of claims 1 to 3 in solidifying soil.

5. The application method of the soil solidifying agent based on the bionic principle according to any one of claims 1 to 3, characterized in that: The following steps are included: 1) mixing sodium alginate, quaternized chitosan, Yellow River soil, a silane coupling agent and water to form a composite hydrogel; 2) The composite hydrogel is pressed, and the surface of the pressed product is sprayed with water and then cured to obtain a soil solidifying agent based on the bionic principle.

6. The application method according to claim 5, characterized in that: In step 1), the mass ratio of the Yellow River soil to water is 75-85:45-55.

7. The application method according to claim 5 or 6, characterized in that: Step 2) The pressing pressure is 48 to 52 kg, and the pressing time is 22 to 26 hours.

8. The application method according to claim 7, characterized in that: The curing temperature in step 2) is room temperature, and the curing time is 5 to 7 days.

9. The application method according to claim 8, characterized in that: The specific process of the mixing in step 1) is as follows: sodium alginate, quaternized chitosan and Yellow River soil are mixed and stirred to obtain a mixture; a silane coupling agent is mixed with water to obtain a silane coupling agent solution; and the silane coupling agent solution and the mixture are mixed.