Ionically modified highly hydrophobic liquid soil solidifier

Abstract

This invention discloses an ion-modified highly hydrophobic liquid soil stabilizer, belonging to the field of soil stabilizer technology. The key technical point is that the soil stabilizer comprises the following components by weight: 40-60 parts soil particle bridging component, 13-20 parts hydrophobic component, 6-10 parts dispersion component, 5-10 parts early-strength component, and 5-8 parts soil particle activation component. The soil particle bridging component is composed of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of (0.8-1.2):(0.4-0.6):(0.01-0.05):(8.35-8.59). The hydrophobic component is composed of organosilicon emulsion, stearic acid anionic surfactant, and water in a weight ratio of (2-4):(0.5-1.5):(4.5-7.5), solving the problem that existing liquid stabilizers cannot rapidly improve water stability in a short time.

Description

Technical Field

[0001] This invention relates to the field of soil stabilizer technology, and in particular to an ion-modified, highly hydrophobic liquid soil stabilizer. Background Technology

[0002] Soil stabilization technology, as a core component of road construction, has always received considerable attention. With the increasing demand for road construction and the gradually rising requirements for engineering quality, the development of soil stabilization technology is crucial for ensuring the stability and durability of roads. It not only affects the service life of roads but also relates to the safety and smooth flow of the entire transportation network, playing a positive role in promoting regional economic development and social stability.

[0003] Traditional soil stabilization techniques primarily rely on inorganic cementitious materials such as cement and lime to solidify the soil. These materials, through physical filling and simple hydration reactions, create a certain degree of adhesion between soil particles, thereby achieving the stabilization effect. In addition, existing technologies also employ liquid soil stabilizers, which to some extent improve the water stability of stabilized soil after various curing stages.

[0004] However, traditional solidification technologies have significant drawbacks. Traditionally solidified soils exhibit low early-stage strength and poor water stability. In the initial solidification phase after compaction, the soil structure is easily damaged if exposed to rainwater. Moreover, for rainy regions such as southern China and Southeast Asia, or for roads undergoing emergency repairs after disasters, existing solidification methods cannot immediately provide roads with high hydrophobicity after compaction, failing to meet the requirement of maintaining the integrity of the soil structure even after being soaked in heavy rain. Summary of the Invention

[0005] To address the problems in the prior art, this invention provides an ion-modified highly hydrophobic liquid soil stabilizer to solve the problem that existing liquid stabilizers cannot rapidly improve water stability in a short period of time.

[0006] This invention provides an ion-modified, highly hydrophobic liquid soil stabilizer, employing the following technical solution:

[0007] An ion-modified, highly hydrophobic liquid soil stabilizer, comprising the following components in parts by weight: 40-60 parts soil particle bridging component, 13-20 parts hydrophobic component, 6-10 parts dispersing component, 5-10 parts early strength component, and 5-8 parts soil particle activating component.

[0008] The soil particle bridging component is composed of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of (0.8-1.2):(0.4-0.6):(0.01-0.05):(8.35-8.59);

[0009] The hydrophobic component is composed of an organosilicon emulsion, stearic acid anionic surfactant, and water in a weight ratio of (2-4):(0.5-1.5):(4.5-7.5).

[0010] By employing the above technical solution, the water glass, aluminum sulfate, and polyacrylamide in the soil particle bridging component work together. Water glass hydrolyzes to produce silicate ions, and aluminum sulfate ionizes to produce high-valence cations such as aluminum ions. These high-valence cations can replace low-valence ions on the soil particle surface, thereby altering the ionic composition of the soil particle surface, reducing the thickness of the soil electric double layer, weakening the electrostatic repulsion between particles, and reducing the repulsion between clay particles by more than 60%. Simultaneously, polyacrylamide can adsorb onto the soil particle surface, acting as a bridging agent, bringing soil particles closer together. This creates favorable conditions for better adhesion of the hydrophobic component to the soil particle surface, for the early-strength component to exert its enhancing effect, and for the soil particle-activating component to activate soil activity. The organosilicon emulsion in the hydrophobic component can form an organosilicon film on the soil particle surface. The hydrophilic groups of the stearic acid anionic surfactant bind to the soil particles through ion exchange, enhancing the adhesion between the hydrophobic component and the soil particles. With the lipophilic groups facing outwards, the two work together to generate a stable hydrophobic layer. Moreover, the hydrophobic structure formed by the organosilicon film and the stearic acid anionic surfactant has different mechanisms of action, which can achieve a dual waterproof effect and significantly improve the hydrophobic performance of the soil stabilizer. This makes the structure of the stabilized soil more stable when it is soaked by rainwater, making it suitable for rainy areas such as the south and Southeast Asia or for road repair after disasters. Even if the soil is soaked by heavy rain after compaction, the soil structure can remain intact.

[0011] In a preferred embodiment, the dispersion component is composed of silane-modified nano-silica, ionic liquid-modified sodium dodecyl sulfate, sodium hexametaphosphate, ammonium polycarboxylate, and deionized water in the order of (2-4): (4-6): (7-9): (2-4): (77-85).

[0012] In a preferred embodiment, the ionic liquid-modified sodium dodecyl sulfate is obtained by modifying sodium dodecyl sulfate with choline lactate, which is prepared by mixing choline and lactic acid.

[0013] By adopting the above technical solution, the dispersion component is composed of silane-modified nano-silica, ionic liquid-modified sodium dodecyl sulfate, sodium hexametaphosphate, ammonium polycarboxylate, and deionized water in a specific ratio. Silane-modified nano-silica has good dispersibility and stability, enabling soil particle bridging components, hydrophobic components, early-strength components, and soil particle activating components to be more uniformly dispersed in the soil, inhibiting particle agglomeration, promoting full contact between each component and soil particles, and better exerting its function. Ionic liquid-modified sodium dodecyl sulfate can enhance compatibility with other components, further improve the surface properties of soil particles, and improve the overall dispersion effect and effect of the solidifier on the soil. Sodium hexametaphosphate can prevent soil particle agglomeration, maintain the dispersion state of each component, and ensure the effective function of each component in the soil. Ammonium polycarboxylate can adjust the fluidity and viscosity of the solidifier, enabling the solidifier to better synergize with other components and penetrate more fully into the soil, thereby significantly improving the solidification and hydrophobic effect of the ionic modified highly hydrophobic liquid soil solidifier on the soil.

[0014] In a preferred embodiment, the early strength component is composed of polyethylene glycol-modified nano-sodium sulfate, EDTA-2Na-modified sodium carbonate, triisopropanolamine, and deionized water in the order of (8-12):(3-7):(6-10):(71-83).

[0015] In a preferred embodiment, the polyethylene glycol-modified nano-sodium sulfate is obtained by the following modification method: nano-sodium sulfate with a particle size D50 of 50-150 nm is ultrasonically dispersed in water, polyethylene glycol is added and ultrasonically dispersed, reacted under heating, and then dried to obtain polyethylene glycol-modified nano-sodium sulfate.

[0016] In a preferred embodiment, the EDTA-2Na modified sodium carbonate is obtained by the following modification method: sodium carbonate with a particle size D50 of 1-5 μm is added to water, stirred and dissolved, then EDTA-2Na is added and stirred and mixed. When the pH of the system drops to 10-10.5, EDTA-2Na modified sodium carbonate is obtained.

[0017] By employing the above technical solution, the early-strength component, consisting of polyethylene glycol-modified nano-sodium sulfate, EDTA-2Na-modified sodium carbonate, triisopropanolamine, and deionized water mixed in a specific ratio, can significantly improve the early strength of the soil stabilizer. Polyethylene glycol-modified nano-sodium sulfate, due to its small particle size and large specific surface area, can be better dispersed in the system after modification with polyethylene glycol. It works synergistically with other components to accelerate the hydration reaction process, enabling the stabilized soil to develop strength more quickly. EDTA-2Na-modified sodium carbonate can regulate the pH and ion concentration of the system, optimize the reaction environment, and promote the formation of hydration products, thereby improving early strength. Triisopropanolamine can activate the activity of cementitious materials such as cement, further enhancing the early strength development of the stabilized soil. Overall, the combination of the substances in the early-strength component and the modification of nano-sodium sulfate and sodium carbonate enable the soil stabilizer to develop high strength in the early stages, meeting the strength requirements of road and other engineering projects in a short period of time.

[0018] In a preferred embodiment, the soil particle activating component is composed of modified bioenzymes and polymers in a 1:2 ratio.

[0019] In a preferred embodiment, the modified bioenzyme is obtained by the following modification method: chitosan is prepared into a chitosan solution, activated by EDC, and then protease, lipase and cellulase are added to the activated chitosan solution, stirred evenly, allowed to stand, filtered and washed to obtain the modified bioenzyme.

[0020] In a preferred embodiment, the weight ratio of the protease, lipase and cellulase is 1:0.4:0.9.

[0021] In a preferred embodiment, the polymer is obtained by mixing and reacting a PVA solution with a PAM solution.

[0022] By adopting the above technical solution, the soil particle activation component is a 1:2 mixture of modified bio-enzymes and polymers, which can activate the soil particles. Combined with the synergistic effects of other components such as soil particle bridging components, hydrophobic components, dispersing components, and early strength components, the physicochemical properties of the soil can be fundamentally changed. For example, bio-enzymes can decompose organic matter, increasing the CBR value of high plasticity clay by 300%, improving the soil's bearing capacity and hydrophobic function, and enhancing the strength and water stability of the soil after solidification. For example, the polymer system forms a three-dimensional network through EDC cross-linking, which significantly improves freeze-thaw cycle stability (strength retention rate ≥85% after 25 cycles). This effectively addresses the solidification problems under special geological conditions and the need for rapid water drainage and rainwater immersion resistance in rainy areas or disaster-stricken road repair.

[0023] In summary, the present invention has the following beneficial effects: the present invention effectively reduces the repulsive force between clay particles by combining soil particle bridging components, hydrophobic components, dispersing components, early strength components and soil particle activating components, so that the hydrophobic components can be adsorbed on the clay particles to form a stable hydrophobic layer. Combined with early strength components and bio-enzyme activating components, the strength and hydrophobic stability of the soil are improved. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments. All reagents, unless otherwise specified, are commercially available conventional reagent products.

[0025] Preparation Example 1

[0026] The preparation method of organosilicon emulsion includes the following steps:

[0027] Sodium dodecylbenzenesulfonate was added to deionized water and stirred until completely dissolved to form an anionic surfactant solution. Then, potassium methylsilicate (solid content 40%) was added dropwise at a rate of 1-2 drops / second, while stirring at 1500 rpm for 50 minutes to form an organosilicon emulsion. The specific weight percentages of each raw material were: sodium dodecylbenzenesulfonate 2%, potassium methylsilicate 45%, and water 53%.

[0028] Preparation Example 2

[0029] The preparation method of stearic acid anionic surfactant includes the following steps:

[0030] Stearic acid (purity ≥98%) was added to deionized water, and NaOH was added at a temperature of 65±5℃ and a rotation speed of 100 rpm for 30 min to produce sodium stearate. Sodium dodecylbenzenesulfonate and AEO-9 were added to the sodium stearate solution and stirred for 20 min to obtain stearic acid anionic surfactant. The weight percentages of each raw material were: stearic acid 5%, NaOH 1%, sodium dodecylbenzenesulfonate 3%, AEO-9 1.5%, and water 89.5%.

[0031] Preparation Example 3

[0032] The preparation method of silane-modified nano-silica includes the following steps:

[0033] S1. Add nano-silica to a mixed solvent of ethanol and water with a volume ratio of 9:1, and ultrasonically disperse at 65±5℃ for 30 min to form a nano-silica suspension.

[0034] S2. Mix KH-550 with water at a weight ratio of 1:3 and stir at 65±5℃ for 30 minutes to form a silane hydrolysate.

[0035] S3. Add the silane hydrolysate to the nano-silicon suspension, reflux at 65±5℃ for 6h, and then vacuum dry for 12h to obtain silane-modified nano-silica.

[0036] Preparation Example 4

[0037] The preparation method of ionic liquid-modified sodium dodecyl sulfate includes the following steps:

[0038] S1. Vacuum dry sodium dodecyl sulfate to remove surface adsorbed moisture, then grind it to a particle size ≤100 mesh;

[0039] S2. Choline and lactic acid (85% aqueous lactic acid solution) are mixed in a molar ratio of 1:1, heated to 40-45℃, and distilled under reduced pressure for 2 hours to obtain choline lactate.

[0040] S3. Add the sodium dodecyl sulfate from step S1 to deionized water and stir until completely dissolved to form a 0.5 mol / L sodium dodecyl sulfate solution, then filter.

[0041] S4. Choline lactate is added to the sodium dodecyl sulfate solution in step S3 at a molar ratio of 0.01:1. After stirring at room temperature for 50 min, the mixture is sonicated at 35°C for 1.5 h. The mixture is then allowed to stand for 12 h, and centrifuged to remove undispersed particles to obtain ionic liquid modified sodium dodecyl sulfate.

[0042] Preparation Example 5

[0043] The preparation method of polyethylene glycol modified nano sodium sulfate includes the following steps:

[0044] Industrial-grade anhydrous sodium sulfate was ground to a D50 of 100 nm. Then, nano-ammonium sulfate was added to deionized water at a solid-liquid ratio of 1:5 and ultrasonically dispersed for 30 min. Polyethylene glycol 400 (2% by weight of sodium sulfate) was added and ultrasonically dispersed for another 20 min. The mixture was then stirred in a water bath at 80 °C for 1 h to ensure uniform coating with polyethylene glycol. Finally, the mixture was spray-dried to obtain polyethylene glycol-modified nano-sodium sulfate.

[0045] Preparation Example 6

[0046] The preparation method of EDTA-2Na modified sodium carbonate includes the following steps:

[0047] Industrial-grade sodium carbonate was ground to a D50 of 1 μm. The sodium carbonate was then added to deionized water at a solid-liquid ratio of 1:3 and stirred at 45±5℃ to dissolve it. 1.5% of EDTA-2Na (dissolved in a small amount of hot water) was added to the sodium carbonate and stirring was continued for 40 min until the pH of the system dropped to 10, thus obtaining EDTA-2Na modified sodium carbonate.

[0048] Preparation Example 7

[0049] The preparation method of the modified bioenzyme includes the following steps:

[0050] S1. Dissolve chitosan in 0.1 mol / L acetic acid solution to prepare a 1% w / v chitosan solution, then add 1% w / v EDC and activate at 23±2℃ for 1 h.

[0051] S2. Mix the protease, lipase and cellulase in a weight ratio of 1:0.4:0.9, add them to the chitosan solution in step S1, stir evenly, let stand at 23±2℃ for 8 hours, then filter and wash to obtain the modified bio-enzyme; wherein the total amount of protease, lipase and cellulase is 5% of the weight of chitosan.

[0052] Preparation Example 8

[0053] The preparation method of the polymer includes the following steps:

[0054] A 10% w / v PVA aqueous solution and a 5% w / v PAM aqueous solution were mixed at a volume ratio of 1:1 and then heated at 60°C for 3 hours to obtain a polymer.

[0055] Example 1

[0056] An ion-modified, highly hydrophobic liquid soil stabilizer comprises the following components:

[0057] 4 kg of soil particle bridging component, 1.3 kg of hydrophobic component, 0.6 kg of dispersing component, 0.5 kg of early strength component, and 0.5 kg of soil particle activating component;

[0058] The soil particle bridging component consists of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of 1:0.5:0.03:8.47.

[0059] The hydrophobic component is composed of the silicone emulsion obtained in Preparation Example 1, the stearic acid anionic surfactant obtained in Preparation Example 2, and water in a weight ratio of 3:1:6.

[0060] The dispersion component is composed of silane-modified nano-silica obtained in Preparation Example 3, ionic liquid-modified sodium dodecyl sulfate obtained in Preparation Example 4, sodium hexametaphosphate, ammonium polycarboxylate, and deionized water in a ratio of 3:5:8:3:81;

[0061] The early strength component is composed of polyethylene glycol modified nano sodium sulfate obtained in Preparation Example 5, EDTA-2Na modified sodium carbonate obtained in Preparation Example 6, triisopropanolamine, and deionized water in a ratio of 10:5:8:77.

[0062] The soil particle activation component is composed of the modified bioenzyme obtained in Preparation Example 7 and the polymer obtained in Preparation Example 8 in a 1:2 ratio;

[0063] Its preparation method includes the following steps:

[0064] S1. Preparation of soil particle bridging components

[0065] S1.1 Dissolve aluminum sulfate in 20% of the total water volume at a water temperature of 40±3℃;

[0066] S1.2 Add 40% of the total water to the reactor, and slowly add water glass (modulus 2.8) at room temperature to 45°C, stirring for 25 minutes to form the base liquid;

[0067] S1.3 Add aluminum sulfate solution to water glass solution to maintain the reaction temperature of the system below 60℃;

[0068] S1.4 Add polyacrylamide to the remaining water and stir to dissolve it to form a colloidal solution. Add the colloidal solution to the solution in step S1.3, stir and mix evenly, and let it stand at room temperature for 4 hours to mature and obtain the soil particle bridging component.

[0069] S2. Preparation of hydrophobic components: Mix organosilicon emulsion, stearic acid anionic surfactant and water for 30 minutes.

[0070] S3, Preparation of Dispersed Components

[0071] S3.1 Add silane-modified nano-silica to 50% deionized water and ultrasonically disperse for 30 min to form a nano suspension;

[0072] S3.2 Add the ionic liquid-modified sodium dodecyl sulfate to the remaining deionized water, heat to 35±5℃ and stir for 20 min;

[0073] S3.3 Add sodium hexametaphosphate to S3.2 and stir for 30 min. Then add nano suspension and stir to disperse for 60 min. Add ammonium polycarboxylate and stir for 30 min. Let the mixture stand for 2 h and then filter to obtain the dispersed component.

[0074] S4. Preparation of early strength components

[0075] S4.1 Add 60% deionized water to the reactor (water temperature is 35±5℃), and slowly add polyethylene glycol modified nano sodium sulfate in three batches, with an interval of 10 min between each batch; stir for 30 min and there is no obvious agglomeration;

[0076] S4.2 Add triisopropanolamine to S4.1 and stir for 20 min. Then add EDTA-2Na modified sodium carbonate dropwise while stirring. After the addition is complete, stir for 30 min and check the pH. The pH is 10.2 (if pH > 11, add a small amount of triisopropanolamine; if pH < 9, add a small amount of unmodified sodium carbonate). Add the remaining water and stir. Filter to obtain the liquid early strength component.

[0077] S5. Preparation of soil particle activation components

[0078] S5.1 Add the modified biological enzyme to deionized water to prepare a 0.5% w / v enzyme solution;

[0079] S5.2 Add the enzyme solution to the polymer solution, stir evenly, add EDC (concentration of 0.1-0.4% w / v), and react at 23±2℃ for 8 hours to obtain soil particle activation components;

[0080] S6. After mixing the soil particle bridging component, hydrophobic component, dispersion component, early strength component, and soil particle activation component evenly according to the above proportions, a liquid soil stabilizer is obtained.

[0081] Example 2

[0082] An ion-modified highly hydrophobic liquid soil stabilizer differs from Example 1 in that the content of each component is different, as follows: 5 kg of soil particle bridging component, 1.6 kg of hydrophobic component, 0.8 kg of dispersing component, 0.8 kg of early strength component, and 0.6 kg of soil particle activating component. All other components are the same as in Example 1.

[0083] Example 3

[0084] An ion-modified highly hydrophobic liquid soil stabilizer differs from Example 1 in that the content of each component is different, as follows: 6 kg of soil particle bridging component, 2 kg of hydrophobic component, 1 kg of dispersing component, 1 kg of early strength component, and 0.8 kg of soil particle activating component. All other components are the same as in Example 1.

[0085] Example 4

[0086] An ion-modified, highly hydrophobic liquid soil stabilizer differs from Example 2 in that the proportions of the soil particle bridging component, hydrophobic component, dispersing component, and early-strength component are different, as detailed below:

[0087] The soil particle bridging component consists of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of 0.8:0.6:0.01:8.59.

[0088] The hydrophobic component is composed of the silicone emulsion obtained in Preparation Example 1, the stearic acid anionic surfactant obtained in Preparation Example 2, and water in a weight ratio of 2:0.5:7.5.

[0089] The dispersion component is composed of silane-modified nano-silica obtained in Preparation Example 3, ionic liquid-modified sodium dodecyl sulfate obtained in Preparation Example 4, sodium hexametaphosphate, ammonium polycarboxylate, and deionized water in a ratio of 2:4:7:2:85.

[0090] The early strength component is composed of polyethylene glycol modified nano sodium sulfate obtained in Preparation Example 5, EDTA-2Na modified sodium carbonate obtained in Preparation Example 6, triisopropanolamine, and deionized water in a ratio of 8:3:6:83, and all other components are the same as in Example 2.

[0091] Example 5

[0092] An ion-modified, highly hydrophobic liquid soil stabilizer differs from Example 2 in that the proportions of the soil particle bridging component, hydrophobic component, dispersing component, and early-strength component are different, as detailed below:

[0093] The soil particle bridging component consists of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of 1.2:0.4:0.05:8.35.

[0094] The hydrophobic component is composed of the silicone emulsion obtained in Preparation Example 1, the stearic acid anionic surfactant obtained in Preparation Example 2, and water in a weight ratio of 4:1.5:4.5.

[0095] The dispersion component is composed of silane-modified nano-silica obtained in Preparation Example 3, ionic liquid-modified sodium dodecyl sulfate obtained in Preparation Example 4, sodium hexametaphosphate, ammonium polycarboxylate and deionized water in a ratio of 4:6:9:4:77;

[0096] The early strength component is composed of polyethylene glycol modified nano sodium sulfate obtained in Preparation Example 5, EDTA-2Na modified sodium carbonate obtained in Preparation Example 6, triisopropanolamine, and deionized water in a ratio of 12:7:10:71, and all other components are the same as in Example 2.

[0097] Comparative Example 1

[0098] A liquid soil stabilizer differs from Example 2 in that an equal amount of sodium dodecylbenzene sulfonate is used instead of the stearic acid anionic surfactant in the hydrophobic component, and sodium dodecyl sulfate is used instead of ionic liquid modified sodium dodecyl sulfate in the dispersion component; otherwise, they are the same as in Example 2.

[0099] Comparative Example 2

[0100] A liquid soil stabilizer differs from Example 2 in that the early strength component uses unmodified nano-sodium sulfate and unmodified sodium carbonate, while all other aspects are the same as in Example 2.

[0101] Comparative Example 3

[0102] A liquid soil stabilizer differs from Example 2 in that the soil particle activation component uses unmodified biological enzymes, i.e., a mixture of protease, lipase and cellulase is used directly, while the other components and contents are the same as in Example 2.

[0103] Comparative Example 4

[0104] A liquid soil stabilizer differs from Example 2 in that the soil particle activating component contains no modified bio-enzymes, only high molecular polymers; otherwise, it is the same as Example 2.

[0105] Comparative Example 5

[0106] A liquid soil stabilizer differs from Example 2 in that the soil particle activating component contains no high molecular polymers, only modified bioenzymes, while all other aspects are the same as in Example 2.

[0107] Performance testing

[0108] The liquid soil stabilizer obtained in the above examples and comparative examples was mixed with water at a ratio of 0.05% by soil mass, and 5% by soil mass of cement was added. The mixture was molded according to the specifications of JTG E51-2009, with a specimen size of 50 mm in diameter and 50 mm in height. The water stability was tested according to the specifications of CJ / T 486-2015 "Soil Stabilizing Admixtures". The compressive strength of the specimens after curing at room temperature to the corresponding age was tested, and the specimens were immediately immersed in water after being pressed and molded. The structural integrity and compressive strength after curing in water to the corresponding age were observed. After curing in water for one day, the specimens were removed and the surface moisture was dried. The mass loss before immersion in water was then tested. The test results are shown in the table below.

[0109] Table 1 Performance test results of specimens made from soil stabilizer and clay

[0110]

[0111] Table 2 Performance test results of specimens made from soil stabilizer and laterite.

[0112]

[0113] Table 3 Performance test results of soil stabilizer and loess specimens

[0114]

[0115] Table 4 Performance test results of specimens made from soil stabilizer and sand.

[0116]

[0117] Based on the test data in Table 1-4:

[0118] When the curing agent obtained in Examples 1-5 of this application is applied to soil solidification, the clay specimens prepared with it have the best unconfined compressive strength. The unconfined compressive strength after 3 days can reach more than 3 MPa. After soaking in water for 3 days, the unconfined compressive strength can also reach more than 2.5 MPa, indicating that the curing agent obtained in this application has rapid water stability in soil solidification.

[0119] Compared with Example 2, when sodium dodecylbenzenesulfonate without stearic acid modification was used in the hydrophobic component and sodium dodecyl sulfate without modification was used in the dispersion component, the unconfined compressive strength of the soil specimens in Comparative Example 1, both in the un-watered and water-watered states, was significantly lower than that in Example 2. This shows that modifying sodium dodecylbenzenesulfonate and sodium dodecyl sulfate can effectively improve the strength and water stability of the soil after solidification.

[0120] Compared with Example 2, when both nano-sodium sulfate and sodium carbonate were unmodified, the unconfined compressive strength of the soil specimens in Comparative Example 2 was significantly reduced. This shows that the modified nano-sodium sulfate and sodium carbonate can effectively improve the strength of the soil after solidification.

[0121] Compared with Example 2, when the bio-enzyme used in Comparative Example 3 was unmodified, the unconfined compressive strength of the un-soaked specimens in Comparative Example 3 within 7 days was basically the same as that in Example 2. However, the unconfined compressive strength after 7 days was significantly lower than that in Example 2. At the same time, the unconfined compressive strength of the soil specimens at all ages after soaking in water in Comparative Example 3 was also significantly lower than that in Example 2. This indicates that the bio-enzyme, after modification, can improve the long-term unconfined compressive strength of the soil specimens.

[0122] Compared with Example 2, when the modified bio-enzyme was absent, the unconfined compressive strength of the unwatered specimens in Comparative Example 4 within 7 days was basically the same as that in Example 2. However, the unconfined compressive strength after 7 days was significantly lower than that in Example 2. At the same time, the unconfined compressive strength of the soil specimens at all ages after water immersion in Comparative Example 4 was also significantly lower than that in Example 2. This indicates that the modified bio-enzyme can improve the long-term unconfined compressive strength of the soil specimens.

[0123] Compared with Example 2, when the polymer was missing, the unconfined compressive strength of the soil specimens in Comparative Example 5, both un-soaked and soaked, was significantly lower than that in Example 2. This may be because the polymer acts as a bridge and network between soil particles. Without the polymer, the structure between soil particles is loose, and the unconfined compressive strength at all ages is reduced.

[0124] The embodiments described herein are merely illustrative of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An ion-modified, highly hydrophobic liquid soil stabilizer, characterized in that: The soil stabilizer comprises the following components in parts by weight: 40-60 parts soil particle bridging component, 13-20 parts hydrophobic component, 6-10 parts dispersing component, 5-10 parts early strength component, and 5-8 parts soil particle activating component. The soil particle bridging component is composed of water glass, aluminum sulfate, polyacrylamide, and water in a weight ratio of (0.8-1.2):(0.4-0.6):(0.01-0.05):(8.35-8.59); The hydrophobic component is composed of an organosilicon emulsion, stearic acid anionic surfactant, and water in a weight ratio of (2-4):(0.5-1.5):(4.5-7.5).

2. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 1, characterized in that: The dispersion component is composed of silane-modified nano-silica, ionic liquid-modified sodium dodecyl sulfate, sodium hexametaphosphate, ammonium polycarboxylate and deionized water in the order of (2-4): (4-6): (7-9): (2-4): (77-85).

3. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 2, characterized in that: The ionic liquid-modified sodium dodecyl sulfate is obtained by modifying sodium dodecyl sulfate with choline lactate, which is prepared by mixing choline and lactic acid.

4. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 1, characterized in that: The early strength component is composed of polyethylene glycol-modified nano sodium sulfate, EDTA-2Na-modified sodium carbonate, triisopropanolamine, and deionized water in the order of (8-12): (3-7): (6-10): (71-83).

5. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 4, characterized in that: The polyethylene glycol-modified nano-sodium sulfate is obtained by the following modification method: nano-sodium sulfate with a particle size D50 of 50-150nm is ultrasonically dispersed in water, polyethylene glycol is added and ultrasonically dispersed, reacted under heating, and then dried to obtain polyethylene glycol-modified nano-sodium sulfate.

6. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 4, characterized in that: The EDTA-2Na modified sodium carbonate is obtained by the following modification method: sodium carbonate with a particle size D50 of 1-5 μm is added to water, stirred and dissolved, then EDTA-2Na is added and stirred and mixed. When the pH of the system drops to 10-10.5, EDTA-2Na modified sodium carbonate is obtained.

7. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 1, characterized in that: The soil particle activation component is composed of modified bioenzymes and polymers in a 1:2 ratio.

8. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 7, characterized in that: The modified bio-enzyme was obtained by the following modification method: chitosan was prepared into a chitosan solution, activated by EDC, and then protease, lipase and cellulase were added to the activated chitosan solution. The mixture was stirred evenly, allowed to stand, filtered and washed to obtain the modified bio-enzyme.

9. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 8, characterized in that: The weight ratio of the protease, lipase and cellulase is 1:0.4:0.

9.

10. The ion-modified highly hydrophobic liquid soil stabilizer according to claim 7, characterized in that: The polymer is obtained by mixing and reacting PVA solution and PAM solution.

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