A fluidized soil performance modifier and method of making same

Abstract

The application discloses a flow state solidified soil performance regulator and a preparation method thereof. The regulator can regulate the anti-dispersion, anti-erosion, anti-segregation, bleeding and specific gravity of the flow state solidified soil, so as to reduce the bearing load of the structure after construction and solidification, and improve the working state of the flow state solidified soil slurry. The raw material is economic and easy to obtain, and the preparation process is simple.

Description

Technical Field

[0001] This invention relates to a performance modifier for fluidized solidified soil and its preparation method, belonging to the field of civil engineering materials technology. Background Technology

[0002] Fluidized solidified soil is a new type of green engineering material formed by adding a solidifying agent and necessary admixtures adapted to the soil characteristics to the soil, then mixing it evenly with water to form a workable material that, after curing, solidifies into a material with certain strength, water stability, and durability. During the pouring and solidification process, the high density of the solidified soil slurry can significantly impact existing structures. Vibration during pouring and solidification increase the segregation of the slurry, thus affecting the performance of the solidified soil. Water flow and wave agitation reduce the anti-dispersion properties of the solidified soil during pouring. Most existing performance modifiers only adjust the fluidity of the slurry, its anti-dispersion properties in still water and unidirectional water flow, and the solidification time; they cannot adjust the density, segregation, and anti-dispersion properties of the solidified soil under wave agitation. Summary of the Invention

[0003] This invention provides a performance modifier for fluidized solidified soil and its preparation method, which solves the problems disclosed in the background art.

[0004] According to one aspect of this disclosure, a performance modifier for fluidized solidified soil is provided, comprising admixture A and admixture B; admixture A is a mixture of calcium oxide alkaline bioash, aluminum-iron bioash, and silica-containing bioash in a first proportion; wherein the first proportion is determined based on the engineering requirements for the weight and strength of the solidified soil slurry before and after the solidification process; admixture B is one or more of xanthan gum, polyacrylamide, jellyfish powder, and kelp fibers; when admixture B is a mixture of multiple components, the components are mixed in a second proportion; wherein the second proportion is determined based on the content of fine and medium sand in the raw soil, the flow regime of the engineering environment, and the erosion resistance of the slurry.

[0005] In some embodiments of this disclosure, if the construction requires the solidified fluid to have a density less than the density threshold and a strength not greater than the strength threshold, the admixture A contains 5-20 parts of calcium oxide alkaline bioash, 7-12 parts of aluminum-iron bioash, and 3-8 parts of silicon-containing bioash.

[0006] In some embodiments of this disclosure, if the construction requires the solidified fluid to have a density less than the density threshold and a later strength greater than the strength threshold, the admixture A contains 15-25 parts of calcium oxide alkaline bioash, 13-28 parts of aluminum-iron bioash, and 10-15 parts of silicon-containing bioash.

[0007] In some embodiments of this disclosure, if the construction requires the fine sand content of the fluidized solidified soil to be less than 50% of the total mass of the soil used, if there is vibration during construction and it is required to reduce the segregation rate of the slurry, if the water erosion resistance index of the fluidized solidified soil slurry is greater than the threshold S after pouring and before the formation of the water erosion resistance capacity, and if the admixture B contains jellyfish-state powder and / or kelp fibers.

[0008] In some embodiments of this disclosure, if the construction requires the content of fine and medium sand in the fluidized solidified soil to be less than 50% of the total mass of the soil used, wherein the content of fine sand is greater than 35% and the content of medium sand is less than 15%, and the water flow velocity in the construction and solidified soil working environment is 1m / s to 1.5m / s and there is vibration and water flow turbulence, the admixture B is a mixture of jellyfish powder and / or kelp filaments and polyacrylamide.

[0009] In some embodiments of this disclosure, if the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of the soil used, wherein the content of fine sand is 10% to 15% and the content of medium sand is 20% to 40%, and the water flow velocity in the construction and solidified soil working environment is 1m / s to 1.5m / s and there is vibration and water flow turbulence, the admixture B is a mixture of jellyfish powder and / or kelp fibers and xanthan gum.

[0010] In some embodiments of this disclosure, if the construction requires the content of fine and medium sand in the fluidized solidified soil to be less than 50% of the total mass of the soil used, wherein the content of fine sand is greater than 35% and the content of medium sand is less than 15%, and the water flow velocity in the construction and solidified soil working environment is 1.5m / s to 3m / s and there is vibration and water flow turbulence, the admixture B is a mixture of xanthan gum and jellyfish state powder.

[0011] In some embodiments of this disclosure, if the construction requires the content of fine and medium sand in the fluidized solidified soil to be less than 50% of the total mass of the soil used, wherein the content of fine sand is 10% to 15% and the content of medium sand is 20% to 40%, and the water flow velocity in the construction and solidified soil working environment is 1.5 m / s to 3 m / s and there is vibration and water flow turbulence, the admixture B is a mixture of xanthan gum, polyacrylamide, jellyfish powder and kelp fibers.

[0012] In some embodiments of this disclosure, the calcium oxide alkaline bioash is any one or a mixture of any combination of sawdust ash, poplar ash, and pine ash; the silicon-containing bioash is any one or a mixture of any combination of sorghum stalk ash, corn stalk ash, rice stalk ash, rice husk ash, rice husk ash, peanut shell ash; the aluminum-iron-containing bioash is any one or a mixture of any combination of sugarcane bagasse ash, corn cob ash, rapeseed stalk ash, and wheat straw ash, and the particle size of the bioash is 20 micrometers to 0.5 millimeters.

[0013] According to another aspect of this disclosure, a method for preparing a performance regulator for fluidized solidified soil is provided, wherein the regulator is the aforementioned performance regulator for fluidized solidified soil; the preparation method includes: mixing the raw materials of admixture A in a proportion and grinding them thoroughly; mixing the raw materials of admixture B in a proportion and grinding them thoroughly.

[0014] The beneficial effects achieved by this invention are as follows: The regulator of this invention can adjust the properties of fluidized solidified soil, such as its resistance to dispersion, erosion, segregation, bleeding, and density, so as to reduce the load on the structure during construction and after solidification, improve the working state of the fluidized solidified soil slurry, and its raw materials are economical, readily available, and the preparation process is simple. Detailed Implementation

[0015] The following embodiments are only used to illustrate the technical solutions of the present invention more clearly, and should not be used to limit the scope of protection of the present invention.

[0016] To adjust the properties of fluidized solidified soil, this invention discloses a fluidized solidified soil performance regulator, comprising admixture A and admixture B; admixture A is a mixture of calcium oxide alkaline bioash, aluminum-iron bioash, and silica-containing bioash in a first proportion; admixture B is one or more of xanthan gum, polyacrylamide, jellyfish powder, and kelp fibers; when admixture B is a mixture of multiple components, the components are mixed in a second proportion; wherein, the first proportion is determined according to the engineering requirements for the weight of the solidified soil slurry and the strength requirements before and after the solidification, and the second proportion is determined according to the content of fine and medium sand in the raw soil, the flow regime of the engineering environment, and the erosion resistance of the slurry.

[0017] For the raw materials of admixture A: the calcium oxide alkaline bioash is any one or a mixture of any number of wood ash, poplar ash, and pine ash; the silica-containing bioash is any one or a mixture of any number of sorghum stalk ash, corn stalk ash, rice stalk ash, rice husk ash, rice husk ash, and peanut shell ash; the aluminum-iron-containing bioash is any one or a mixture of any number of sugarcane bagasse ash, corn cob ash, rapeseed stalk ash, and wheat straw ash; and the particle size of the bioash is 20 micrometers to 0.5 millimeters. For the raw materials of admixture B: jellyfish powder is mainly composed of polyvinyl alcohol, sodium alginate, and carbomer; kelp fibers are mainly composed of alginate and natural plant fibers, which can partially dissolve in water and produce filaments and gels; xanthan gum is a biopolymer, white or pale yellow in color, extracted from Xanthomonas bacteria, and exhibits good adhesion and pseudoplasticity even at low concentrations; polyacrylamide is a linear polymer that can dissolve in water in any proportion, possesses good flocculation properties, and can improve soil water retention, permeability, and stabilize soil structure. These raw materials are economical and readily available, which can reduce the raw material and production costs of the conditioner.

[0018] The compositions of admixture A and admixture B differ to suit different construction requirements, as detailed below:

[0019] If the construction requires the solidified fluid to have a density less than the density threshold (i.e., relatively light density) and a strength not greater than the strength threshold (i.e., relatively low strength), the admixture A should contain 5-20 parts of calcium oxide alkaline bioash, 7-12 parts of aluminum-iron bioash, and 3-8 parts of silica bioash.

[0020] If the construction requires the solidified fluid to have a density less than the density threshold (i.e., relatively light density) and a later strength greater than the strength threshold (i.e., relatively high later strength), the admixture A should contain 15-25 parts of calcium oxide alkaline bioash, 13-28 parts of aluminum-iron bioash, and 10-15 parts of silica bioash.

[0021] If the construction requires that the fine sand content of the fluidized solidified soil be less than 50% of the total mass of the soil used, and if there is vibration during construction and it is required to reduce the segregation rate of the slurry, the slurry of the fluidized solidified soil must have a water erosion resistance index greater than the threshold S (i.e., it has good water erosion resistance) after pouring and before the formation of water erosion resistance, and the admixture B contains jellyfish-state powder and / or kelp fibers.

[0022] If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with the content of fine sand being greater than 35% and the content of medium sand being less than 15%, and the water flow velocity in the construction and solidified soil working environment be 1m / s to 1.5m / s and there be vibration and water flow turbulence, then admixture B is a mixture of jellyfish powder and / or kelp fibers and polyacrylamide.

[0023] If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with fine sand content of 10% to 15% and medium sand content of 20% to 40%, and the water flow velocity in the construction and solidified soil working environment be 1m / s to 1.5m / s and there be vibration and water flow turbulence, then admixture B is a mixture of jellyfish powder and / or kelp fibers and xanthan gum.

[0024] If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with the content of fine sand being greater than 35% and the content of medium sand being less than 15%, and the water flow velocity in the construction and solidified soil working environment be 1.5m / s to 3m / s and there be vibration and water flow turbulence, then admixture B is a mixture of xanthan gum and jellyfish powder.

[0025] If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with fine sand content of 10% to 15% and medium sand content of 20% to 40%, and the water flow velocity in the construction and solidified soil working environment be 1.5 m / s to 3 m / s and there be vibration and water flow turbulence, then admixture B is a mixture of xanthan gum, polyacrylamide, jellyfish powder and kelp fibers.

[0026] The preparation of the above-mentioned regulator is relatively simple, requiring only simple stirring and grinding. Specifically: Add admixture A to a mixer according to the specified ratio (generally by mass fraction), stir until homogeneous, and then grind thoroughly in a ball mill. Add admixture B to a mixer according to the specified ratio (generally by mass fraction), and stir until homogeneous. When using, simply add admixture A and admixture B according to the construction requirements.

[0027] To verify the effectiveness of the above-mentioned regulators, the following experiment was conducted:

[0028] Experiments 1-2 were conducted in terrestrial environments under the same conditions, comparing the density and strength of sample groups with different additives. Experiments 3-6 were conducted in underwater environments under the same conditions, comparing the anti-dispersion, anti-erosion, and anti-segregation properties of polyacrylamide and xanthan gum, commonly used in solidified soil, as comparative additives with those of sample groups with additives.

[0029] Experiment 1: Using clay, P·O 42.5 cement, and water as raw materials, the mass ratio of the mixture was soil:cement:water:modifier = 100:20:96:5. The modifier was prepared by mass ratio of 0-4 parts of calcium oxide alkaline bioash, 0-2 parts of silica-containing bioash, 0-6 parts of aluminum-iron bioash, and 2 parts of polyacrylamide as the control sample group. Using soil, P·O 42.5 cement, water, and modifier as raw materials, the mass ratio of the mixture was soil:cement:water:modifier = 100:20:96:5. The modifier was prepared by mass ratio of calcium oxide alkaline bioash:silica-containing bioash:aluminum-iron bioash:polyacrylamide = 17:10:9:2. A fluidized solidified soil slurry was prepared as the comparison sample group.

[0030] Experiment 2: Using clay, P·O 42.5 cement, and water as raw materials, two mixing ratios were prepared: soil:cement:water = 100:20:85 and soil:cement:water = 100:20:85:11. The modifiers were prepared in the following proportions: 1-15 parts of calcium oxide alkaline bioash, 1-10 parts of silica-containing bioash, 1-13 parts of aluminum-iron bioash, and 2 parts of polyacrylamide. A control sample group was prepared using soil, P·O 42.5 cement, water, and modifiers as raw materials, with a mixing ratio of soil:cement:water:modifier = 100:20:85:7 and a modifier ratio of calcium oxide alkaline bioash:silica-containing bioash:aluminum-iron bioash:polyacrylamide = 20:13:21:2. A comparative sample group was prepared using these two mixing ratios: soil:cement:water:modifier = 100:20:85:7 and modifiers: calcium oxide alkaline bioash:silica-containing bioash:aluminum-iron bioash:polyacrylamide = 20:13:21:2.

[0031] Experiment 3: Using soil, P·O 42.5 cement, and water as raw materials, the soil contained 38% fine sand, 7% medium sand, and 55% clay particles. The mass ratio of the mixture was soil:cement:water:modifier = 100:20:78:12, and the mass ratio of the modifier was calcium oxide alkaline bioash:silica bioash:aluminum iron bioash:polyacrylamide = 14:11:7:9. A fluidized solidified soil slurry was prepared as a control sample group. Using soil, P·O 42.5 cement, water, and modifier as raw materials, the mass ratio of the mixture was soil:cement:water:modifier = 100:20:78:12, and the mass ratio of the modifier was calcium oxide alkaline bioash:silica bioash:aluminum iron bioash:kelp / jellyfish powder:polyacrylamide = 14:11:7:6:3. A fluidized solidified soil slurry was prepared as a comparison sample group.

[0032] Experiment 4: Using sand, P·O 42.5 cement, and water as raw materials, the sand contained 13% fine sand, 31% medium sand, and 56% clay particles. The mass ratio of the mixture was soil:cement:water:modifier = 100:20:100:15, and the mass ratio of the modifier was calcium oxide alkaline bioash:silica bioash:aluminum iron bioash:polyacrylamide = 25:16:11:13. A fluidized solidified soil slurry was prepared as the control sample group. 42.5 Cement, water, and modifier were used as raw materials, and the mass ratio of the admixture was soil:cement:water:modifier = 100:20:100:15. The mass ratio of the modifier was calcium oxide alkaline bioash: silica-containing bioash: aluminum-iron bioash: jellyfish powder and / or kelp filaments: xanthan gum = 25:16:11:3:10. A fluidized solidified soil slurry was prepared as a comparison sample group.

[0033] Experiment 5: Using sand, P·O 42.5 cement, and water as raw materials, the medium soil contained 40% fine sand, 4% medium sand, and 56% clay particles. The mass ratio of the mixture was soil:cement:water:modifier = 100:20:90:13. The mass ratio of the modifier was calcium oxide alkaline bioash:silica bioash:aluminum-iron bioash:xanthan gum / polyacrylamide = 28:19:17:13. The prepared fluidized solidified soil slurry served as the control sample group. 42.5 Cement, water, and regulator were used as raw materials, and the mass ratio of the admixture was soil:cement:water:regulator = 100:20:90:13. The mass ratio of the regulator was calcium oxide alkaline bioash: silica-containing bioash: aluminum-iron bioash: xanthan gum: polyacrylamide: jellyfish powder = 28:19:17:2:5:6. A fluidized solidified soil slurry was prepared as a comparison sample group.

[0034] Experiment 6: Using sand, P·O 42.5 cement, and water as raw materials, the sand contained 15% fine sand, 26% medium sand, and 59% clay particles. The mixing ratio was soil:cement:water:modifier = 100:20:80:10, and the modifier mixing ratio was calcium oxide alkaline:silica bioash:aluminum-iron bioash:xanthan gum / polyacrylamide = 33:23:21:32. A fluidized solidified soil slurry was prepared as the control sample group. 42.5 Cement, water, and modifier were used as raw materials, and the mass ratio of the admixtures was soil:cement:water:modifier = 100:20:80:10. The mass ratio of the modifier was calcium oxide alkaline:silica-containing bioash:aluminum-iron bioash:xanthan gum:polyacrylamide:jellyfish powder:kelp filaments = 33:23:21:4:7:8:13. A fluidized solidified soil slurry was prepared as a comparison sample group.

[0035] Table 1. Ingredients of the experimental formulation

[0036]

[0037]

[0038]

[0039]

[0040] Table 2. Test Results

[0041]

[0042]

[0043]

[0044] The above experiments show that, whether in terrestrial or underwater environments, the modifier of this invention can adjust the properties of fluidized solidified soil, such as its resistance to dispersion, erosion, segregation, bleeding, and density, thereby reducing the load on the structure during construction and after solidification, improving the working state of the fluidized solidified soil slurry, and its raw materials are economical, readily available, and the preparation process is simple.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A performance modifier for fluidized solidified soil, characterized in that, Includes admixture A and admixture B; Admixture A is a mixture of calcium oxide alkaline bioash, aluminum-iron bioash and silica-containing bioash in a first proportion; wherein, the first proportion is determined according to the project's requirements for the weight and strength of the solidified soil slurry before and after the process. If the construction requires the solidified fluid to have a density less than the density threshold and a strength not greater than the strength threshold, then admixture A should contain 5-20 parts of calcium oxide alkaline bioash, 7-12 parts of aluminum-iron bioash, and 3-8 parts of silica bioash. If the construction requires the solidified fluid to have a density less than the density threshold and a later strength greater than the strength threshold, then admixture A should contain 15-25 parts of calcium oxide alkaline bioash, 13-28 parts of aluminum-iron bioash, and 10-15 parts of silica bioash. The calcium oxide alkaline bioash is any one or a mixture of any combination of sawdust ash, poplar ash, and pine ash. The silica bioash is any one or a mixture of any combination of sorghum stalk ash, corn stalk ash, rice straw ash, rice husk ash, rice husk ash, and peanut shell ash. The aluminum-iron bioash is any one or a mixture of any combination of sugarcane bagasse ash, corn cob ash, rapeseed stalk ash, and wheat straw ash. Admixture B is one or more of xanthan gum, polyacrylamide, jellyfish powder, and kelp fibers; when admixture B is a mixture of multiple components, the components are mixed in a second proportion; wherein, the second proportion is determined based on the content of fine and medium sand in the raw soil, the flow regime of the water in the engineering environment, and the scour resistance of the slurry. If the construction requires that the fine sand content of the fluidized solidified soil be less than 50% of the total mass of the soil used, and if there is vibration during construction and it is required to reduce the segregation rate of the slurry, and if the water erosion resistance index of the fluidized solidified soil slurry is greater than the threshold S after pouring and before the formation of the water erosion resistance capacity, and if the admixture B contains jellyfish-state powder and / or kelp fibers.

2. The fluidized solidified soil performance modifier according to claim 1, characterized in that, If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with the content of fine sand being greater than 35% and the content of medium sand being less than 15%, and the water flow velocity in the construction and solidified soil working environment be 1m / s~1.5m / s and there be vibration and water flow turbulence, then admixture B is a mixture of jellyfish powder and / or kelp fibers and polyacrylamide.

3. The fluidized solidified soil performance modifier according to claim 1, characterized in that, If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with fine sand content of 10%~15% and medium sand content of 20%~40%, and the water flow velocity in the construction and solidified soil working environment is 1m / s~1.5m / s and there is vibration and water flow turbulence, the admixture B is a mixture of jellyfish powder and / or kelp fibers and xanthan gum.

4. The fluidized solidified soil performance regulator according to claim 1, characterized in that, If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with the content of fine sand being greater than 35% and the content of medium sand being less than 15%, and the water flow velocity in the construction and solidified soil working environment be 1.5m / s~3m / s and there be vibration and water flow turbulence, then admixture B is a mixture of xanthan gum and jellyfish powder.

5. The fluidized solidified soil performance regulator according to claim 1, characterized in that, If the construction requires that the content of fine and medium sand in the fluidized solidified soil be less than 50% of the total mass of soil used, with fine sand content of 10%~15% and medium sand content of 20%~40%, and the water flow velocity in the construction and solidified soil working environment is 1.5m / s~3m / s and there is vibration and water flow turbulence, the admixture B is a mixture of xanthan gum, polyacrylamide, jellyfish powder and kelp fibers.

6. The fluidized solidified soil performance modifier according to claim 1, characterized in that, The particle size of bioash ranges from 20 micrometers to 0.5 millimeters.

7. A method for preparing a performance modifier for fluidized solidified soil, characterized in that, The regulator is the regulator according to any one of claims 1 to 6; the preparation method includes: stirring the raw materials of admixture A in proportion and grinding them thoroughly; stirring the raw materials of admixture B in proportion and grinding them thoroughly.

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