Soil stabilization method using hydrophobic soil stabilizer

Abstract

The application relates to the technical field of soil solidification and discloses a soil solidification construction method using a hydrophobic soil solidification agent, which comprises the following construction steps: 1) preparing the solidification agent; 2) uniformly stirring a set amount of the solidification agent and soil on a construction area by using a stirring head of a stirrer to form a to-be-rolled soil body; 3) sprinkling water on the surface of the to-be-rolled soil body until the surface of the to-be-rolled soil body is wet; and 4) compacting the to-be-rolled soil body by using a road roller, and standing for a set time to form a solidified soil body. In this way, the solidified soil body can meet the requirements of various vehicles and machines. The hydrophobic soil solidification agent is mixed with soil by using the stirring head, the hydrophilicity of the soil is changed into hydrophobicity, water is sprinkled on the surface of the to-be-rolled soil body, and then the to-be-rolled soil body is compacted, so that the soil particles are hydrophobic, water penetration and erosion are prevented, and the forming strength and stability are improved.

Description

Technical Field

[0001] This invention relates to the technical field of soil solidification, and more specifically, to a soil solidification compaction construction method using a hydrophobic soil solidification agent. Background Technology

[0002] With the continuous development of urban construction and industrialization, soil pollution and desertification have become increasingly serious problems. Soil stabilization technology has long been one of the effective ways to solve these problems. Currently, common soil stabilization methods mainly include mechanical compaction, chemical stabilization, and biological stabilization.

[0003] In existing technologies, chemical solidification is generally employed. This method primarily involves mixing additives such as cement, mineral powder, lime, and polymers to form a soil stabilizer. After mixing with the soil, the soil stabilizer transforms the dispersed soil system into a solid monolithic system, thereby improving the soil's mechanical properties. However, most commonly used soil stabilizers on the market are purely cementing materials, which can lead to strength loss under long-term weathering and water erosion. Summary of the Invention

[0004] The purpose of this invention is to provide a soil solidification compaction construction method using a hydrophobic soil stabilizer, aiming to solve the problem of poor soil solidification effect in the prior art.

[0005] This invention is implemented as follows: a soil stabilization and compaction construction method using a hydrophobic soil stabilizer includes the following construction steps:

[0006] 1) Preparation of hydrophobic soil stabilizer;

[0007] 2) Use the mixing head of the mixer to mix the set amount of hydrophobic soil stabilizer with the soil in the construction area to form the soil body to be compacted;

[0008] 3) Sprinkle water on the surface of the soil to be compacted until the surface of the soil to be compacted is moist;

[0009] 4) Compact the soil to be compacted using a road roller, and allow it to stand for a set time to form solidified soil. Optionally, in step 1), the preparation of the hydrophobic soil stabilizer includes the following preparation steps:

[0010] 1.1) Mix mineral powder, cement, gypsum and fly ash in a set ratio to form a mixed powder;

[0011] 1.2) Ferrous sulfate and water-reducing agent are added to the mixed powder, and the mixed powder, ferrous sulfate and water-reducing agent are mixed and stirred to form the hydrophobic soil stabilizer.

[0012] Optionally, the hydrophobic soil stabilizer, by weight, comprises 30%–60% mineral powder, 30%–60% cement, 0.5%–15% gypsum, 15%–30% fly ash, 0.1%–2% ferrous sulfate, and 0.05%–0.5% water-reducing agent.

[0013] Optionally, in step 2), the soil in the construction area is stirred and broken up using the stirring head, and then a set amount of hydrophobic soil stabilizer is added to the soil in the construction area. The hydrophobic soil stabilizer is then stirred evenly with the soil in the construction area using the stirring head.

[0014] Optionally, in step 3), water is sprayed onto the surface of the soil to be compacted using a water truck or spraying device.

[0015] Optionally, in step 1.1), a mixer is used to mix the mineral powder, cement, gypsum and fly ash evenly until a dry powder mixture is formed.

[0016] The mixer has a horizontally rotating mixing drum with a mixing chamber, in which the mineral powder, cement, gypsum and fly ash are mixed evenly.

[0017] Optionally, a rotating shaft is connected to the bottom of the stirring drum, and the rotating shaft drives the stirring drum to rotate horizontally.

[0018] Optionally, a rotary motor is fixed to the top of the stirring cylinder. The rotary motor has a stirring shaft extending toward the stirring chamber. The stirring shaft is movably connected to the stirring cylinder via a bearing. The stirring shaft has a stirring section placed in the stirring chamber.

[0019] The stirring section is connected to a plurality of outwardly extending stirring rods. The inner end of the stirring rod is connected to the stirring section, and the outer end of the stirring rod extends freely outward. Along the direction from the inner end to the outer end of the stirring rod, the width of the stirring rod gradually increases. In step 2), when the stirring shaft rotates, the stirring rods stir the mixed powder, ferrous sulfate and water-reducing agent in the stirring chamber evenly.

[0020] The stirring shaft has a hollow cavity, which is connected to a blower. The bottom of the stirring section is provided with a vent, which is connected to the hollow cavity. When the stirring drum rotates, the rotating motor drives the stirring shaft to rotate in the opposite direction, and the blower injects high-pressure gas into the hollow cavity. The high-pressure gas in the hollow cavity is ejected downward through the vent.

[0021] Optionally, the stirring chamber has a surrounding annular wall, and the annular wall is provided with an inwardly recessed mounting groove. The mounting groove is arranged around the annular wall along the surrounding direction, and a horizontally rotatable outer ring is movably mounted in the mounting groove.

[0022] A rotating inner ring is fixedly sleeved on the outer periphery of the bottom of the stirring shaft. There is an annular stirring interval between the rotating inner ring and the rotating outer ring. A rotating mesh layer is arranged in the stirring interval. The outer periphery of the rotating mesh layer is fixedly connected to the rotating outer ring, and the inner periphery of the rotating mesh layer is fixedly connected to the rotating inner ring.

[0023] When the stirring shaft rotates horizontally, the inner rotating ring rotates horizontally, which in turn drives the rotating mesh layer to rotate horizontally, and drives the outer rotating ring to rotate horizontally. The rotating mesh layer then mixes the mineral powder, cement, gypsum, and fly ash in the mixing interval evenly.

[0024] Optionally, the annular wall is provided with a plurality of inwardly recessed grooves, which are arranged around the annular wall along the circumferential direction, and the plurality of grooves are arranged vertically at intervals.

[0025] The outer end of the stirring roller is provided with an elastic movable block, which is movably placed in the rail groove. When the rotating shaft rotates, the stirring roller mixes the mineral powder, cement, gypsum and fly ash in the stirring chamber evenly, and the movable block moves forward along the extension direction of the rail groove.

[0026] Compared with existing technologies, the soil stabilization and compaction method using a hydrophobic soil stabilizer provided by this invention ensures that the solidified soil meets the requirements for various vehicles and machinery. By using a mixing head to mix the hydrophobic soil stabilizer with the soil, the soil's hydrophilicity is transformed into hydrophobicity. Water is then sprinkled onto the surface of the soil to be compacted before compaction. The hydrophobic soil particles prevent water penetration and erosion. Furthermore, because very little water is used—only water is sprinkled on the surface of the soil to be compacted—the water and hydrophobic soil stabilizer react completely, improving the forming strength and stability. Additionally, the hydrophobic nature of the soil enhances its resistance to long-term weathering and water erosion. Attached Figure Description

[0027] Figure 1 This is a cross-sectional schematic diagram of the stirring tank provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0030] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] Reference Figure 1 The image shows a preferred embodiment of the present invention.

[0032] The soil stabilization and compaction construction method using a hydrophobic soil stabilizer provided by this invention includes the following construction steps:

[0033] 1) Preparation of hydrophobic soil stabilizer;

[0034] 2) Use the mixing head of the mixer to mix the set amount of hydrophobic soil stabilizer with the soil in the construction area to form the soil body to be compacted;

[0035] 3) Sprinkle water on the surface of the soil to be compacted until the surface of the soil is moist;

[0036] 4) Use a road roller to compact the soil to be compacted, and let it stand for a set time to form solidified soil.

[0037] The soil stabilization and compaction method using a hydrophobic soil stabilizer described above ensures that the solidified soil meets the requirements for various vehicles and machinery. By mixing the hydrophobic soil stabilizer with the soil using a mixing head, the soil's hydrophilicity is transformed into hydrophobicity. Water is then sprinkled onto the surface of the soil to be compacted before compaction. The hydrophobic soil particles prevent water penetration and erosion. Furthermore, because very little water is used—only water is sprinkled on the surface of the soil—the water and the hydrophobic soil stabilizer react completely, improving the compaction strength and stability. Additionally, the hydrophobic nature of the soil enhances its resistance to long-term weathering and water erosion.

[0038] In step 1), the preparation of the hydrophobic soil stabilizer includes the following preparation steps:

[0039] 1.1) Mix mineral powder, cement, gypsum and fly ash in a set ratio to form a mixed powder;

[0040] 1.2) Add ferrous sulfate and water-reducing agent to the mixed powder, and mix the mixed powder, ferrous sulfate and water-reducing agent to form a hydrophobic soil stabilizer.

[0041] Based on mass composition, hydrophobic soil stabilizers include 30%–60% mineral powder, 30%–60% cement, 0.5%–15% gypsum, 15%–30% fly ash, 0.1%–2% ferrous sulfate, and 0.05%–0.5% water-reducing agent.

[0042] Curing principle:

[0043] Fly ash is an industrial waste residue, a byproduct of coal-fired power generation and other coal-fired industries. It is a gray, fine powder, mainly composed of silica, alumina, and calcium oxide, requiring the use of Class C high-calcium fly ash. In soil stabilizers, fly ash can play the following roles:

[0044] (1) Enhance soil hardness and strength, and improve compressive strength and shear strength.

[0045] (2) Improve soil pore structure, reduce soil porosity, and promote soil drainage and aeration performance.

[0046] (3) Reduce the shrinkage and expansion properties of the soil and improve the stability of the soil.

[0047] Mineral powder:

[0048] Mineral powder is a type of industrial waste residue, formed after processing. It requires the use of S95 or higher grade mineral powder. In soil stabilizers, mineral powder can play the following roles:

[0049] (1) Increase the binding strength of the soil and improve its mechanical strength and durability.

[0050] (2) Improve the particle shape of the soil, make the soil more compact, and reduce water infiltration.

[0051] (3) Reduce the impact of soil shrinkage and expansion, and increase soil stability.

[0052] plaster:

[0053] In soil stabilizers, gypsum can play the following roles:

[0054] (1) Promotes the crystallization and growth of clay minerals in the soil, and improves the stability and viscosity of the soil.

[0055] (2) Increase soil density and hardness, and improve soil mechanical strength and durability.

[0056] cement:

[0057] PO42.5 cement is required. In soil stabilizers, cement plays several roles:

[0058] (1) Improve the early strength of solidified soil.

[0059] (2) Sparks from igniting mineral powder.

[0060] Surface Ca 2+ Mg 2+ Under the action of OH-, Ca(OH)2 and Mg(OH)2 are generated, which damages the glass surface and releases Na from the activator. + K + Or other ions with Ca 2+ Mg 2+ The replacement occurs, linking to Si-O or Al-O bonds, leading to the destruction, decomposition, and dissolution of the glass network structure. Ca(OH)2 reacts with the dissolved active SiO2 in the system to form CSH gel with a lower ion concentration. Therefore, the heterogeneous ion balance of Ca(OH)2 is disrupted.

[0061] As the hydration reaction continues, Ca(OH)₂ crystals dissolve and CSH gel deposits, gradually thickening and hardening the slurry, thus increasing its strength. Ferrous sulfate and polycarboxylate superplasticizer are added in small amounts; appropriate amounts can create a stable, water-resistant, weather-resistant, and corrosion-resistant soil structure. Ferrous sulfate is chosen because it accelerates the hardening of cement and mineral powder, making the solidification more uniform. Furthermore, after the sulfate ions are consumed in the reaction, the ferrous ions can form a flocculent structure in the soil, changing the soil's hydrophilicity to hydrophobicity. Polycarboxylate superplasticizer improves the fluidity of the curing agent and reduces water consumption, thereby saving costs.

[0062] In step 2), the soil in the construction area is mixed and broken up using a mixing head. Then, a predetermined amount of hydrophobic soil stabilizer is added to the soil in the construction area, and the hydrophobic soil stabilizer is then mixed evenly with the soil in the construction area using the mixing head. This ensures that the hydrophobic soil stabilizer is evenly mixed with the soil.

[0063] In step 3), water is sprayed onto the surface of the soil to be compacted using a water truck or spraying device. This allows the surface of the soil to be compacted to be quickly moistened.

[0064] Specifically, in step 1.1), a mixer is used to mix mineral powder, cement, gypsum and fly ash evenly until a dry powder mixture is formed;

[0065] The mixer has a horizontally rotating mixing drum 100, which has a mixing chamber 101 in which mineral powder, cement, gypsum and fly ash are mixed evenly.

[0066] In this embodiment, a rotating shaft 110 is connected to the bottom of the stirring tank, and the rotating shaft 110 drives the stirring tank to rotate horizontally. In this way, the rotating shaft 110 drives the stirring tank to rotate.

[0067] A rotary motor 120 is fixed to the top of the stirring drum 100. The rotary motor 120 has a stirring shaft 121 extending toward the stirring chamber 101. The stirring shaft 121 is movably connected to the stirring drum 100 through a bearing. The stirring shaft 121 has a stirring section placed in the stirring chamber 101.

[0068] Multiple outwardly extending stirring rods 122 are connected to the stirring section. The inner end of the stirring rod 122 is connected to the stirring section, and the outer end of the stirring rod 122 extends freely outward. Along the direction from the inner end to the outer end of the stirring rod 122, the width of the stirring rod 122 gradually increases. In step 2), as the stirring shaft 121 rotates, the stirring rods 122 stir the mixed powder, ferrous sulfate and water-reducing agent in the stirring chamber 101 evenly.

[0069] The stirring shaft 121 has a hollow cavity 1210, which is connected to the blower. The bottom of the stirring section is provided with a vent 1211, which is connected to the hollow cavity 1210. When the stirring drum 100 rotates, the rotating motor 120 drives the stirring shaft 121 to rotate in the opposite direction, and injects high-pressure gas into the hollow cavity 1210 through the blower. The high-pressure gas in the hollow cavity 1210 is sprayed downward through the vent 1211.

[0070] In this way, during the rotation of the mixing drum 100, the material in the mixing chamber 101 is stirred evenly by the action of the mixing shaft 121 and the mixing rod 122. The high-pressure gas sprayed downwards causes the material at the bottom of the mixing chamber 101 to be dispersed upwards, promoting uniform mixing.

[0071] The stirring chamber 101 has a surrounding annular wall 102, and the annular wall 102 is provided with an inwardly recessed mounting groove. The mounting groove is arranged around the annular wall 102 along the surrounding direction, and a horizontally rotatable outer ring 130 is movably installed in the mounting groove.

[0072] A rotating inner ring 131 is fixedly sleeved on the outer periphery of the bottom of the stirring shaft 121. There is an annular stirring interval between the rotating inner ring 131 and the rotating outer ring 130. A rotating mesh layer 132 is arranged in the stirring interval. The outer periphery of the rotating mesh layer 132 is fixedly connected to the rotating outer ring 130, and the inner periphery of the rotating mesh layer 132 is fixedly connected to the rotating inner ring 131.

[0073] When the stirring shaft 121 rotates horizontally, the inner rotating ring 131 rotates horizontally, which drives the rotating mesh layer 132 to rotate horizontally, and drives the outer rotating ring 130 to rotate horizontally. The rotating mesh layer 132 mixes the mineral powder, cement, gypsum and fly ash in the mixing interval evenly.

[0074] The rotating mesh layer 132 is driven to rotate by the stirring shaft 121, so that the material settled in the lower part of the stirring chamber 101 can be quickly and evenly stirred.

[0075] The annular wall 102 is provided with multiple inwardly recessed rail grooves 103, which are arranged around the annular wall 102 along the surrounding direction, and the multiple rail grooves 103 are arranged vertically at intervals.

[0076] The outer end of the stirring roller 122 is provided with a flexible movable block 123, which is movably placed in the track groove 103. When the rotating shaft 110 rotates, the stirring roller 122 mixes the mineral powder, cement, gypsum and fly ash in the mixing chamber 101 evenly, and the movable block 123 moves forward along the extension direction of the track groove 103. In this way, the mixing is more uniform and thorough, and the effect is better.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil stabilization compaction construction method using a hydrophobic soil stabilizer, characterized in that, The construction steps include the following: 1) Preparation of hydrophobic soil stabilizer; 2) Use the mixing head of the mixer to mix the set amount of hydrophobic soil stabilizer with the soil in the construction area to form a soil body to be compacted; 3) Sprinkle water on the surface of the soil to be compacted until the surface of the soil to be compacted is moist; 4) Compact the soil to be compacted using a road roller, and allow it to stand for a set time to form solidified soil; In step 1), the preparation of the hydrophobic soil stabilizer includes the following preparation steps: 1.1) Mix mineral powder, cement, gypsum and fly ash in a set ratio to form a mixed powder; 1.2) Ferrous sulfate and a water-reducing agent are added to the mixed powder, and the mixed powder, ferrous sulfate and water-reducing agent are mixed and stirred to form the hydrophobic soil stabilizer; Based on mass composition, the hydrophobic soil stabilizer comprises 30%~60% mineral powder, 30%~60% cement, 0.5%~15% gypsum, 15%~30% fly ash, 0.1%~2% ferrous sulfate, and 0.05%~0.5% water-reducing agent; In step 1.1), the mineral powder, cement, gypsum and fly ash are mixed evenly using a mixer until a dry powder mixture is formed. The mixer has a horizontally rotating mixing drum, which has a mixing chamber, in which the mineral powder, cement, gypsum and fly ash are mixed evenly. A rotary motor is fixed to the top of the stirring cylinder. The rotary motor has a stirring shaft extending toward the stirring chamber. The stirring shaft is movably connected to the stirring cylinder via a bearing. The stirring shaft has a stirring section placed in the stirring chamber. The stirring section is connected to a plurality of outwardly extending stirring rods. The inner end of the stirring rod is connected to the stirring section, and the outer end of the stirring rod extends freely outward. Along the direction from the inner end to the outer end of the stirring rod, the width of the stirring rod gradually increases. In step 2), when the stirring shaft rotates, the stirring rods stir the mixed powder, ferrous sulfate and water-reducing agent in the stirring chamber evenly. The stirring shaft has a hollow cavity, which is connected to a blower. The bottom of the stirring section is provided with a vent, which is connected to the hollow cavity. When the stirring drum rotates, the rotating motor drives the stirring shaft to rotate in the opposite direction, and the blower injects high-pressure gas into the hollow cavity. The high-pressure gas in the hollow cavity is ejected downward through the vent.

2. The soil stabilization compaction construction method using a hydrophobic soil stabilizer as described in claim 1, characterized in that, In step 2), the soil in the construction area is stirred and broken up using the stirring head, and then a set amount of hydrophobic soil stabilizer is added to the soil in the construction area. The hydrophobic soil stabilizer is then stirred evenly with the soil in the construction area using the stirring head.

3. The soil stabilization compaction construction method using a hydrophobic soil stabilizer as described in claim 2, characterized in that, In step 3), water is sprayed onto the surface of the soil to be compacted using a water truck or spraying device.

4. The soil stabilization compaction construction method using a hydrophobic soil stabilizer as described in claim 2, characterized in that, The bottom of the stirring drum is connected to a rotating shaft, which drives the stirring drum to rotate horizontally.

5. The soil stabilization compaction construction method using a hydrophobic soil stabilizer as described in claim 4, characterized in that, The stirring chamber has a surrounding annular wall, and the annular wall is provided with an inwardly recessed mounting groove. The mounting groove is arranged around the annular wall along the surrounding direction, and a horizontally rotatable outer ring is movably installed in the mounting groove. A rotating inner ring is fixedly sleeved on the outer periphery of the bottom of the stirring shaft. There is an annular stirring interval between the rotating inner ring and the rotating outer ring. A rotating mesh layer is arranged in the stirring interval. The outer periphery of the rotating mesh layer is fixedly connected to the rotating outer ring, and the inner periphery of the rotating mesh layer is fixedly connected to the rotating inner ring. When the stirring shaft rotates horizontally, the inner rotating ring rotates horizontally, which in turn drives the rotating mesh layer to rotate horizontally, and drives the outer rotating ring to rotate horizontally. The rotating mesh layer then mixes the mineral powder, cement, gypsum, and fly ash in the mixing interval evenly.

6. The soil stabilization compaction construction method using a hydrophobic soil stabilizer as described in claim 5, characterized in that, The annular wall is provided with multiple inwardly recessed grooves, which are arranged around the annular wall in a circular direction and are spaced apart vertically. The outer end of the stirring roller is provided with an elastic movable block, which is movably placed in the rail groove. When the rotating shaft rotates, the stirring roller mixes the mineral powder, cement, gypsum and fly ash in the stirring chamber evenly, and the movable block moves forward along the extension direction of the rail groove.

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