Multifunctional soil stabilizer as well as preparation method and use method thereof

Abstract

The invention provides a multifunctional soil stabilizer as well as a preparation method and a use method thereof, and the multifunctional soil stabilizer comprises the following components in parts by mass: 33-55 parts of shell powder, 48-75 parts of fly ash, 90-150 parts of a fine aggregate composition, 12-34 parts of a sterilizing filler and 35-55 parts of a polysaccharide binder, wherein the fine aggregate composition comprises a recycled mixture and a fine aggregate cleaning solution, and the recycled mixture comprises cleaned red brick powder and recycled concrete powder; the fine aggregate cleaning solution is a cleaning solution obtained by cleaning the red brick powder and the recycled concrete powder. The problems that an existing soil stabilizer is high in production cost, the combination degree of building waste and soil is low, and the compressive strength of the cured soil is not ideal are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil solidification, and in particular relates to a multifunctional soil solidifier and a preparation method and a use method thereof. Background Art

[0002] Soil stabilizer is a new type of energy-saving and environmentally friendly engineering material synthesized from a variety of inorganic and organic materials for solidifying various types of soil. After being mixed with soil, soil stabilizer changes the engineering properties of soil through a series of physical and chemical reactions. It can fix a large amount of free water in the soil in the form of crystal water, which reduces the surface charge of soil flocs, thins the double electric layer adsorbed by flocs, increases electrolyte concentration, and makes particles tend to condense. The volume expands and further fills the soil pores. Under the action of compaction work, the solidified soil is easy to compact and stabilize, thus forming an overall structure and achieving a compaction density that conventional soil cannot achieve. The strength, density, rebound modulus, deflection value, CBR, shear strength and other properties of soil treated with soil stabilizer can be improved to a certain extent, thereby extending the service life of the road and saving engineering maintenance costs.

[0003] Traditional soil solidifiers use silicate cement and quicklime as the main raw materials, with high production costs and unsatisfactory compressive strength of the soil after solidification.

[0004] Although construction waste is sometimes used as road construction materials for road construction for energy conservation and environmental protection reasons, this type of road construction material has the defects of low bonding with the soil and easy stratification, which is not conducive to soil reinforcement. Summary of the invention

[0005] In order to solve the above-mentioned problems of the prior art, the present invention provides a multifunctional soil solidifier and a preparation method and a use method thereof, which solve the problems of high production cost of the existing soil solidifier, low bonding degree between construction waste and soil, and unsatisfactory compressive strength of the solidified soil.

[0006] The present invention is achieved through the following technical solutions: A multifunctional soil solidifier comprises, by weight, 33-55 parts of shell powder, 48-75 parts of fly ash, 90-150 parts of fine aggregate composition, 12-34 parts of bactericidal filler, and 35-55 parts of polysaccharide binder; wherein the fine aggregate composition comprises a recycled mixture and a fine aggregate cleaning liquid, the recycled mixture comprises cleaned red brick powder and recycled concrete powder; and the fine aggregate cleaning liquid is a cleaning liquid obtained by cleaning the red brick powder and recycled concrete powder.

[0007] Preferably, the mass ratio of the red brick powder to the recycled concrete powder is 1:(1.5-3).

[0008] Preferably, the polysaccharide binder includes one or more of sugarcane juice, glutinous rice water and xanthan gum.

[0009] Furthermore, the polysaccharide binder includes sugarcane juice, glutinous rice water and xanthan gum.

[0010] Preferably, the bactericidal filler includes one or both of sulphur stone powder and montmorillonite powder.

[0011] The preparation method of the multifunctional soil solidifying agent comprises: respectively obtaining shell powder, fly ash, bactericidal filler and polysaccharide binder; The red brick powder and the recycled concrete powder are mixed and placed on a sieve; the red brick powder and the recycled concrete powder on the sieve are rinsed with water, and the filtered washing liquid is collected; the red brick powder and the recycled concrete powder are rinsed again with the washing liquid, and after repeating the process several times, the filtered washing liquid is collected and used as a fine aggregate cleaning liquid after filtration, and the red brick powder and the recycled concrete powder on the sieve are collected and dried as a recycled mixture.

[0012] Preferably, in the preparation method of the multifunctional soil solidifier, the mass of the water is 25%-60% of the total mass of the red brick powder and the recycled concrete powder.

[0013] Preferably, the polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, and the preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 1-2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Heat the sugarcane juice to boiling, add glutinous rice water and xanthan gum, heat to boiling again, and simmer for 15-30 minutes to obtain a polysaccharide binder.

[0014] The method for using the multifunctional soil solidifier comprises: mixing shell powder, fly ash and sterilization filler, mixing with soil to be solidified, then sequentially adding the regenerated mixture and polysaccharide binder to the soil to be solidified for mixing, and spraying fine aggregate cleaning liquid during the mixing process.

[0015] Preferably, in the method for using the multifunctional soil solidifier, when the soil to be solidified is dry sandy soil, the amount of the soil solidifier used is 0.1-0.2 times the mass of the soil to be solidified, and the soil solidifier is diluted with water.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The multifunctional soil solidifying agent of the present invention comprises shell powder, fly ash, fine aggregate composition, bactericidal filler and polysaccharide binder, and uses shell powder, fly ash and fine aggregate composition to increase the compactness and compressive strength of soil, improve the bearing capacity of soil, and under the action of polysaccharide binder, tightly bond with soil, improve curing efficiency and curing quality, and provide sterilization and protection effect for the cured soil through bactericidal filler, and provide reliable guarantee for the lasting stability of soil curing. Among them, by cleaning red brick powder and recycled concrete powder, impurities and loose particles on the surface of red brick powder and recycled concrete powder can be effectively removed, which helps to improve the bonding strength between them and soil; at the same time, by backfilling and using fine aggregate cleaning liquid, calcium hydroxide can be recovered to further improve the bonding strength of soil, and at the same time, it can also avoid causing waste of resources and realize efficient utilization of resources. The utilization of fly ash, red brick powder and recycled concrete powder makes the present invention have the advantages of energy saving and environmental protection, and also realizes the resource utilization of construction waste and industrial waste, and reduces the production cost of soil solidifying agent.

[0017] Furthermore, the polysaccharide binder of the present invention is preferably a composition of sugarcane juice, glutinous rice water and xanthan gum. Sugarcane juice is rich in sugar and various organic compounds (such as glucose, fructose, etc.), which can react with minerals in the soil to form a stable colloidal structure and improve the bonding force between soil particles. The content of branched starch in glutinous rice water is high, and it has strong viscosity after gelatinization, which can effectively fill the pores between soil particles and enhance the overall strength and compression resistance of the soil. At the same time, both are natural materials, and compared with the traditional general chemical curing method, they are non-toxic to the environment and will not cause pollution to the soil and the surrounding ecosystem after use.

[0018] Furthermore, the bactericidal filler of the present invention is selected from one or both of sulfur stone powder and montmorillonite powder. First, sulfur stone powder and montmorillonite powder can achieve the effect of sterilization and antiseptic. Secondly, montmorillonite also has extremely strong adsorption capacity and ion exchange capacity, which can reduce the capillary phenomenon of soil by absorbing free water and ions in the soil, prevent groundwater upwelling and surface water infiltration, and can enhance the stability of soil through adsorption and fixation, and prevent soil from turning over and losing. DETAILED DESCRIPTION

[0019] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] It should be noted that the process equipment or devices not specifically specified in the following embodiments are all conventional equipment or devices in the art.

[0021] It should be noted that the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0022] The multifunctional soil solidifying agent of the present invention comprises, by weight, 33-55 parts of shell powder, 48-75 parts of fly ash, 90-150 parts of fine aggregate composition, 12-34 parts of bactericidal filler, and 35-55 parts of polysaccharide binder; wherein the fine aggregate composition comprises a recycled mixture and a fine aggregate cleaning liquid, the recycled mixture comprises cleaned red brick powder and recycled concrete powder; and the fine aggregate cleaning liquid is a cleaning liquid obtained by cleaning the red brick powder and recycled concrete powder.

[0023] In some specific embodiments of the present invention, the mass ratio of the red brick powder to the recycled concrete powder is 1:(1.5-3), more preferably 1:3.

[0024] The preparation method of the fine aggregate composition of the present invention comprises: S1, mixing red brick powder and recycled concrete powder and placing them on a sieve; S2, washing the red brick powder and recycled concrete powder on the sieve with water, collecting the filtered washing liquid; washing the red brick powder and recycled concrete powder again with the washing liquid, repeating the process several times, collecting the filtered washing liquid, filtering it as a fine aggregate cleaning liquid, collecting the red brick powder and recycled concrete powder on the sieve and drying them as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0025] Among them, the sieve used is preferably a 50-mesh sieve.

[0026] In the preparation method of the fine aggregate composition, the amount of water used is 25%-60% of the total mass of the red brick powder and the recycled concrete powder, and more preferably 50%; the number of flushing times for the red brick powder and the recycled concrete powder is preferably 3-5 times.

[0027] As a detailed explanation, flushing red brick powder and recycled concrete powder can effectively remove impurities and loose particles on the surface of red brick powder and recycled concrete powder, which helps to improve their bonding strength with the soil. However, calcium hydroxide is easily washed away during the flushing process. Recycling the fine aggregate cleaning liquid can recover calcium hydroxide to further improve the bonding strength of the soil and avoid waste of resources.

[0028] The polysaccharide binder of the present invention comprises one or more of sugarcane juice, glutinous rice water and xanthan gum.

[0029] In some specific embodiments, the polysaccharide binder includes sugarcane juice, glutinous rice water and xanthan gum, and the method for preparing the polysaccharide binder includes: After washing the glutinous rice, soak it in water for 1-2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Heat the sugarcane juice to boiling, add glutinous rice water and xanthan gum, heat to boiling again, and simmer for 15-30 minutes to obtain a polysaccharide binder.

[0030] Since polysaccharide binders are added to the soil, they tend to accelerate the reproduction of microorganisms, which can easily affect the solidification quality of the soil over time. For this reason, bactericidal fillers are introduced.

[0031] The bactericidal filler of the present invention comprises one or both of sulphur stone powder and montmorillonite powder, preferably a mixture of sulphur stone powder and montmorillonite powder, the mass ratio of sulphur stone powder and montmorillonite powder being (1-3):1, more preferably 2:1. First, sulphur stone powder and montmorillonite powder can achieve the effect of sterilization and antiseptic. Secondly, montmorillonite is a layered silicate mineral with extremely strong adsorption capacity and ion exchange capacity. Its crystal structure is composed of two layers of silicon oxygen tetrahedron sandwiched between a layer of aluminum oxygen octahedron, and there are exchangeable cations between the layers, so that montmorillonite can adsorb and fix a large amount of water and ions. Montmorillonite reduces the capillary phenomenon of the soil by adsorbing free water and ions in the soil, preventing groundwater upwelling and surface water infiltration, and can enhance the stability of the soil and prevent soil slurrying and loss through adsorption and fixation.

[0032] The fly ash used in the present invention is a coal combustion product, i.e., industrial waste. The main chemical components and contents of the fly ash used in the embodiments of the present invention are shown in Table 1.

[0033] Table 1 Main chemical composition and content of fly ash

[0034] The preparation method of the multifunctional soil solidifying agent of the present invention comprises: respectively obtaining shell powder, fly ash, bactericidal filler and polysaccharide binder; The red brick powder and the recycled concrete powder are mixed and placed on a sieve; the red brick powder and the recycled concrete powder on the sieve are rinsed with water, and the filtered washing liquid is collected; the red brick powder and the recycled concrete powder are rinsed again with the washing liquid, and after repeating the process several times, the filtered washing liquid is collected and used as a fine aggregate cleaning liquid after filtration, the red brick powder and the recycled concrete powder on the sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0035] When flushing the red brick powder and the recycled concrete powder, the amount of water used is 25%-60% of the total mass of the red brick powder and the recycled concrete powder, and more preferably 50%.

[0036] In the preparation method of the multifunctional soil solidifier, the polysaccharide binder preferably includes sugarcane juice, glutinous rice water and xanthan gum, and the mass ratio of sugarcane juice, glutinous rice water and xanthan gum is preferably 6:10:1.

[0037] The preparation method of the polysaccharide binder used in the present invention comprises: After washing the glutinous rice, soak it in water for 1-2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; After heating the sugarcane juice to boiling, keep boiling for 1-3 minutes, add glutinous rice water and xanthan gum, heat to boiling again, and simmer for 15-30 minutes on low heat to obtain a polysaccharide binder.

[0038] The method for using the multifunctional soil solidifier specifically comprises: mixing shell powder, fly ash and sterilized filler, mixing with soil to be solidified, then sequentially adding the regenerated mixture and polysaccharide binder to the soil to be solidified for mixing, and spraying fine aggregate cleaning liquid during the mixing process.

[0039] When the soil to be solidified is dry sandy soil, the amount of soil solidifier used is 0.1-0.2 times the mass of the soil to be solidified, and the soil solidifier is diluted with twice the amount of water.

[0040] Example 1 The soil solidifier of this embodiment includes, by weight, 33 parts of shell powder, 48 parts of fly ash, 90 parts of fine aggregate composition, 12 parts of bactericidal filler, and 35 parts of polysaccharide binder, wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid.

[0041] The preparation method of the fine aggregate composition specifically comprises: The red brick powder and recycled concrete powder were mixed evenly in a mass ratio of 1:3 and placed on a 50-mesh sieve; Weigh half the total mass of red brick powder and recycled concrete powder; The red brick powder and the recycled concrete powder on the 50-mesh sieve are rinsed with water, and the filtrated washing liquid is collected to rinse the red brick powder and the recycled concrete powder again. After repeated rinsing for 4 times, the filtrated washing liquid is collected and filtered as a fine aggregate cleaning liquid. The red brick powder and the recycled concrete powder on the 50-mesh sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0042] The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, wherein the mass ratio of the sugarcane juice, glutinous rice water and xanthan gum is 6:10:1. The preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Add sugarcane juice into the pot, bring to a boil over high heat, keep boiling for 2 minutes, add glutinous rice water and xanthan gum, bring to a boil again, simmer over low heat for 20 minutes, let stand and cool to obtain the polysaccharide binder.

[0043] The bactericidal filler is obtained by mixing sulfur stone powder and montmorillonite powder in a mass ratio of 2:1.

[0044] Example 2 The soil solidifier of this embodiment includes, by weight, 42 parts of shell powder, 55 parts of fly ash, 108 parts of fine aggregate composition, 22 parts of bactericidal filler, and 39 parts of polysaccharide binder, wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid.

[0045] The preparation method of the fine aggregate composition specifically comprises: The red brick powder and recycled concrete powder were mixed evenly in a mass ratio of 1:3 and placed on a 50-mesh sieve; Weigh half the total mass of red brick powder and recycled concrete powder; The red brick powder and the recycled concrete powder on the 50-mesh sieve are rinsed with water, and the filtrated washing liquid is collected to rinse the red brick powder and the recycled concrete powder again. After repeated rinsing for 4 times, the filtrated washing liquid is collected and filtered as a fine aggregate cleaning liquid. The red brick powder and the recycled concrete powder on the 50-mesh sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0046] The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, wherein the mass ratio of the sugarcane juice, glutinous rice water and xanthan gum is 6:10:1. The preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Add sugarcane juice into the pot, bring to a boil over high heat, keep boiling for 2 minutes, add glutinous rice water and xanthan gum, bring to a boil again, simmer over low heat for 20 minutes, let stand and cool to obtain the polysaccharide binder.

[0047] The bactericidal filler is obtained by mixing sulfur stone powder and montmorillonite powder in a mass ratio of 2:1.

[0048] Example 3 The soil solidifier of this embodiment includes, by weight, 48 parts of shell powder, 65 parts of fly ash, 120 parts of fine aggregate composition, 26 parts of bactericidal filler, and 45 parts of polysaccharide binder, wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid.

[0049] The preparation method of the fine aggregate composition specifically comprises: The red brick powder and recycled concrete powder were mixed evenly in a mass ratio of 1:3 and placed on a 50-mesh sieve; Weigh half the total mass of red brick powder and recycled concrete powder; The red brick powder and the recycled concrete powder on the 50-mesh sieve are rinsed with water, and the filtrated washing liquid is collected to rinse the red brick powder and the recycled concrete powder again. After repeated rinsing for 4 times, the filtrated washing liquid is collected and filtered as a fine aggregate cleaning liquid. The red brick powder and the recycled concrete powder on the 50-mesh sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0050] The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, wherein the mass ratio of the sugarcane juice, glutinous rice water and xanthan gum is 6:10:1. The preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Add sugarcane juice into the pot, bring to a boil over high heat, keep boiling for 2 minutes, add glutinous rice water and xanthan gum, bring to a boil again, simmer over low heat for 20 minutes, let stand and cool to obtain the polysaccharide binder.

[0051] The bactericidal filler is obtained by mixing sulfur stone powder and montmorillonite powder in a mass ratio of 2:1.

[0052] Example 4 The soil solidifier of this embodiment includes, by weight, 52 parts of shell powder, 68 parts of fly ash, 135 parts of fine aggregate composition, 32 parts of bactericidal filler, and 51 parts of polysaccharide binder, wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid.

[0053] The preparation method of the fine aggregate composition specifically comprises: The red brick powder and recycled concrete powder were mixed evenly in a mass ratio of 1:3 and placed on a 50-mesh sieve; Weigh half the total mass of red brick powder and recycled concrete powder; The red brick powder and the recycled concrete powder on the 50-mesh sieve are rinsed with water, and the filtrated washing liquid is collected to rinse the red brick powder and the recycled concrete powder again. After repeated rinsing for 4 times, the filtrated washing liquid is collected and filtered as a fine aggregate cleaning liquid. The red brick powder and the recycled concrete powder on the 50-mesh sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0054] The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, wherein the mass ratio of the sugarcane juice, glutinous rice water and xanthan gum is 6:10:1. The preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Add sugarcane juice into the pot, bring to a boil over high heat, keep boiling for 2 minutes, add glutinous rice water and xanthan gum, bring to a boil again, simmer over low heat for 20 minutes, let stand and cool to obtain the polysaccharide binder.

[0055] The bactericidal filler is obtained by mixing sulfur stone powder and montmorillonite powder in a mass ratio of 2:1.

[0056] Example 5 The soil solidifier of this embodiment includes, by weight, 55 parts of shell powder, 75 parts of fly ash, 150 parts of fine aggregate composition, 34 parts of bactericidal filler, and 55 parts of polysaccharide binder, wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid.

[0057] The preparation method of the fine aggregate composition specifically comprises: The red brick powder and recycled concrete powder were mixed evenly in a mass ratio of 1:3 and placed on a 50-mesh sieve; Weigh half the total mass of red brick powder and recycled concrete powder; The red brick powder and the recycled concrete powder on the 50-mesh sieve are rinsed with water, and the filtrated washing liquid is collected to rinse the red brick powder and the recycled concrete powder again. After repeated rinsing for 4 times, the filtrated washing liquid is collected and filtered as a fine aggregate cleaning liquid. The red brick powder and the recycled concrete powder on the 50-mesh sieve are collected and dried as a recycled mixture; the obtained recycled mixture and the fine aggregate cleaning liquid are combined as a fine aggregate composition.

[0058] The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, wherein the mass ratio of the sugarcane juice, glutinous rice water and xanthan gum is 6:10:1. The preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Add sugarcane juice into the pot, bring to a boil over high heat, keep boiling for 2 minutes, add glutinous rice water and xanthan gum, bring to a boil again, simmer over low heat for 20 minutes, let stand and cool to obtain the polysaccharide binder.

[0059] The bactericidal filler is obtained by mixing sulfur stone powder and montmorillonite powder in a mass ratio of 2:1.

[0060] Comparative Example 1 The method is basically the same as Example 1, except that the fine aggregate composition uses unwashed red brick powder and recycled concrete powder, and does not contain fine aggregate cleaning liquid. The amount of red brick powder and recycled concrete powder in the soil solidifying agent of Comparative Example 1 is the same as that of the red brick powder and recycled concrete powder in Example 1.

[0061] Comparative Example 2 The method is substantially the same as Example 1, except that the fine aggregate composition only includes the recycled mixture and does not include the fine aggregate cleaning solution. The amount of the recycled mixture in the soil solidifying agent of Comparative Example 2 is the same as that of the recycled mixture in Example 1.

[0062] Comparative Example 3 It is basically the same as Example 1, except that the polysaccharide binder is replaced by xanthan gum.

[0063] The soil solidifying agent of each of the above embodiments and comparative examples is used as follows: after mixing shell powder, fly ash and bactericidal filler evenly, mix them with the soil to be solidified, then add the recycled mixture (unwashed red brick powder and recycled concrete powder in comparative example 1) and polysaccharide binder to the soil to be solidified in sequence and mix them evenly. During the mixing process, spray fine aggregate cleaning liquid (water is sprayed in comparative examples 1 and 2), and the addition of soil solidifying agent is completed. The amount of soil solidifying agent used is 0.2 times the mass of the soil to be solidified.

[0064] Five samples of sandy soil were obtained in the same area by five-point sampling. After mixing, they were divided into twenty-four samples, each of which was a group of three. According to the above-mentioned usage method, soil reinforcement was carried out according to the raw material ratios of Examples 1-5 and Comparative Examples 1-3, and then standard specimens were prepared according to the "Test Procedure for Stabilized Materials of Inorganic Binders for Highway Engineering" (JTG 3441-2024). Small cylindrical specimens of φ50mm×50mm were selected, wherein each example and comparative example had corresponding three standard specimens. After compressive strength tests were performed respectively, the average compressive strength corresponding to the three standard specimens of the same example and comparative example was calculated, and the results are shown in Table 2 below.

[0065] Table 2 Compressive strength of standard specimens of various embodiments and comparative examples (MPa)

[0066] It can be seen from Table 2 that after the sandy soil is reinforced according to the raw material ratio provided in Example 5, the soil compressive strength is most ideal, and the compressive strength of Examples 1-5 in the same period is better than that of Comparative Examples 1-3.

[0067] By comparing the data of Comparative Example 1 and Comparative Example 2, it can be seen that compared with the standard specimens formed by unwashed red brick powder and recycled concrete powder, the compressive strength of the standard specimens formed after washing the red brick powder and recycled concrete powder is significantly improved, which indicates that washing the red brick powder and recycled concrete powder can improve their bonding strength with the soil.

[0068] By comparing the data of Comparative Example 2 and Example 1, it can be seen that although the bonding strength between the red brick powder and the recycled concrete powder and the soil is improved after washing in Comparative Example 2, the soil bonding strength obtained after recycling the fine aggregate cleaning liquid in Example 1 is higher than that of Comparative Example 2, which indicates that the reuse of the fine aggregate cleaning liquid can further improve the soil bonding strength.

[0069] By comparing the data of Comparative Example 3 and Example 1, it can be seen that when only xanthan gum is used as a binder, the soil bonding strength obtained is lower than the soil bonding strength of Example 1 of the present invention using a combined polysaccharide binder of sugarcane juice, glutinous rice water and xanthan gum, indicating that sugarcane juice and glutinous rice water play an important role in improving soil bonding strength.

Claims

1. A multifunctional soil solidifier, characterized in that: Calculated by weight, it includes: 33-55 parts of shell powder, 48-75 parts of fly ash, 90-150 parts of fine aggregate composition, 12-34 parts of bactericidal filler, and 35-55 parts of polysaccharide binder; wherein the fine aggregate composition includes a recycled mixture and a fine aggregate cleaning liquid, the recycled mixture includes cleaned red brick powder and recycled concrete powder; the fine aggregate cleaning liquid is a cleaning liquid obtained by cleaning the red brick powder and recycled concrete powder.

2. The multifunctional soil solidifying agent according to claim 1, characterized in that: The mass ratio of the red brick powder to the recycled concrete powder is 1:(1.5-3).

3. The multifunctional soil solidifying agent according to claim 1, characterized in that: The polysaccharide binder includes one or more of sugarcane juice, glutinous rice water and xanthan gum.

4. The multifunctional soil solidifying agent according to claim 3, characterized in that: The polysaccharide binder includes sugarcane juice, glutinous rice water and xanthan gum.

5. The multifunctional soil solidifying agent according to claim 1, characterized in that: The bactericidal filler comprises one or both of sulfur stone powder and montmorillonite powder.

6. The method for preparing the multifunctional soil solidifying agent according to any one of claims 1 to 5, characterized in that: include: respectively obtaining shell powder, fly ash, bactericidal filler and polysaccharide binder; The red brick powder and the recycled concrete powder are mixed and placed on a sieve; the red brick powder and the recycled concrete powder on the sieve are rinsed with water, and the filtered washing liquid is collected; the red brick powder and the recycled concrete powder are rinsed again with the washing liquid, and after repeating the process several times, the filtered washing liquid is collected and used as a fine aggregate cleaning liquid after filtration, and the red brick powder and the recycled concrete powder on the sieve are collected and dried as a recycled mixture.

7. The method for preparing the multifunctional soil solidifying agent according to claim 6, characterized in that: The mass of the water is 25%-60% of the total mass of the red brick powder and the recycled concrete powder.

8. The method for preparing the multifunctional soil solidifying agent according to claim 6, characterized in that: The polysaccharide binder comprises sugarcane juice, glutinous rice water and xanthan gum, and the preparation method of the polysaccharide binder comprises: After washing the glutinous rice, soak it in water for 1-2 hours, take out the glutinous rice and squeeze it to obtain glutinous rice water; Heat the sugarcane juice to boiling, add glutinous rice water and xanthan gum, heat to boiling again, and simmer for 15-30 minutes to obtain a polysaccharide binder.

9. The method for using the multifunctional soil solidifying agent according to any one of claims 1 to 5, characterized in that: include: After mixing shell powder, fly ash and sterilized filler, mix them with soil to be solidified, then add recycled mixture and polysaccharide binder to the soil to be solidified in turn and mix them. During the mixing process, spray fine aggregate cleaning liquid.

10. The method for using the multifunctional soil solidifying agent according to claim 9, characterized in that: When the soil to be solidified is dry sandy soil, the amount of soil solidifier used is 0.1-0.2 times the mass of the soil to be solidified, and the soil solidifier is diluted with water.

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