Solid-waste-based premixed flow-state solidified soil and preparation method thereof

Abstract

The invention relates to the field of solidified soil, and particularly discloses solid-waste-based premixed flow-state solidified soil and a preparation method thereof. The solid-waste-based premixed flow-state solidified soil comprises soil, water and a curing agent according to the weight ratio of (28-36): (50-54): (6-9), according to the total weight of the curing agent, the curing agent comprises the following components in parts by weight: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea sludge, 1-3 parts of a water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulphoaluminate, 3-10 parts of a fiber reinforced material and 1-3 parts of phosphate. The problems that stress generated by the solidified soil in the hydration process is excessively concentrated and shrinkage is excessive can be solved, and therefore cracking of the solidified soil subjected to premixed flow state solidification is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of solidified soil, and in particular to a solid waste-based premixed fluidized solidified soil and a preparation method thereof. Background Art

[0002] Premixed fluidized solidified soil is made by making full use of sea silt, foundation soil discarded after foundation pit excavation, slag and other materials, absorbing the abandoned soil on site, adding a certain proportion of special cementitious materials (curing agents) and water, and mixing them evenly through a series of processes and special machinery to form a self-leveling, self-compacting, pumpable engineering material. After pouring or filling and curing, it is solidified into a new type of geotechnical engineering material with a certain strength, impermeability, and long-term stability.

[0003] In the related art, a method for preparing fluidized solidified soil using construction waste is disclosed, which includes the preparation of a special solidifying admixture and the preparation of fluidized solidified soil; the preparation method of fluidized solidified soil includes the following steps: 1) preparing construction waste excavated from construction projects, selecting unpolluted plain soil that meets the relevant heavy metal and pollution limit standards of the "Soil Pollution Risk Screening Values ​​and Control Values ​​for Construction Land" (kgB36600-2018) and the "Soil Testing Series Standards" (NY / T1121-2006), and the soil contains the most stones. The maximum particle size should be ≤10mm; 2) A mud soaking pool is set up in the backfill operation area, and the plain soil and water are soaked in proportion for 1-2 days. After 2 days, the mud blocks are broken up in the mud soaking pool to prepare mud; 3) A stirring pool is built below the mud soaking pool, and the mud put down from the upper soaking pool is added with a proportion of curing admixture, and the mud soaking pool and the excavator are used to mix evenly to obtain the fluidized solidified soil of the present invention; the slag, curing admixture and water are mixed in a weight ratio of 35-40:5-10:55-60. The curing admixture is composed of fly ash, slag, quicklime, calcined kaolin, sodium silicate, sodium sulfate and polyether silicone defoamer.

[0004] Since the curing admixture contains components such as quicklime, large shrinkage stress may be generated during the hydration process, causing cracking of the material and affecting the integrity of the structure. Summary of the invention

[0005] In order to reduce cracking of premixed fluidized solidified soil, the present application provides a solid waste-based premixed fluidized solidified soil and a preparation method thereof.

[0006] In the first aspect, the present application provides a solid waste-based premixed fluidized solidified soil, which adopts the following technical solution: A solid waste-based premixed fluidized solidified soil, comprising soil, water and a solidifying agent in the following weight ratio of (28-36):(50-54):(6-9); based on the total weight of the solidifying agent, the solidifying agent comprises the following components in parts by weight: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea silt, 1-3 parts of water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulfoaluminate, 3-10 parts of fiber reinforcement material, and 1-3 parts of phosphate.

[0007] By adopting the above technical scheme, at the above ratio of soil, water and curing agent, a premixed fluidized solidified soil with excellent fluidity can be obtained. Fly ash is a fine particle that can provide a fine particle filling effect and enhance the compactness of the material. Slag, as an auxiliary component of cementitious materials, can improve the later strength of the solidified soil. Silica ash is a highly active siliceous material that can promote hydration reaction and improve the early strength of the material. The water reducer can reduce the water-cement ratio and improve the fluidity and working performance of the slurry. Sea silt has good adhesion and plasticity, contains rich minerals and trace elements, and can play multiple roles such as adhesion, filling, and improving rheological properties. Therefore, the selection of these four solid wastes in combination with water reducers can improve the early strength, late strength and compactness of the solidified soil, so that the solidified soil has good workability before solidification and good durability after solidification. Sodium hydroxide is used to stimulate the activity of slag and fly ash and accelerate the hydration reaction process. Calcium sulfoaluminate compensates for shrinkage during hydration and reduces the risk of cracking. Fiber-reinforced materials can improve the toughness and crack resistance of materials. Phosphates control the hydration reaction speed and avoid excessive hydration leading to temperature stress concentration and cracking. Therefore, by synergizing the above-mentioned proportions of sodium hydroxide, calcium sulfoaluminate, fiber reinforcement materials and phosphates, the problem of excessive stress concentration and excessive shrinkage in the solidified soil during the hydration process can be avoided, thereby reducing the cracking of the solidified soil after the premixed fluid state solidification.

[0008] In a specific embodiment, the curing agent further comprises the following components in parts by weight: 0.2-0.6 parts of water glass powder.

[0009] By adopting the above technical scheme, water glass powder can be quickly dissolved in water. In the solidified soil, water glass and sodium hydroxide can react to form silica gel. These gel substances have strong bonding force and can tightly bond soil particles together. The gel substances can also fill the pores between soil particles, which helps to improve the density and strength of the solidified soil, thereby achieving the effect of reducing cracking of the solidified soil and improving the durability of the solidified soil.

[0010] In a specific embodiment, the curing agent further includes tartaric acid.

[0011] By adopting the above technical solution, tartaric acid plays the role of adjusting pH value and complexing agent in the curing agent. The acidity of tartaric acid can neutralize part of the strong alkalinity of sodium hydroxide, so that the pH value of the solidified soil is maintained within an appropriate range, which is conducive to the chemical reaction between the components. At the same time, tartaric acid can also react with silicate ions in water glass to form stable complexes, which can fill the pores between soil particles, improve the density of the solidified soil, and reduce the cracking of the solidified soil.

[0012] In a specific embodiment, the curing agent further comprises the following components in parts by weight: 1-3 parts of nano calcium carbonate.

[0013] By adopting the above technical solution, nano calcium carbonate has a very small particle size, which can effectively fill the tiny pores in the solidified soil, promote the hydration reaction of cement and other cementitious materials, generate more hydration products, and thus improve the strength of the solidified soil. In addition, due to the high specific surface area and activity of nano calcium carbonate, it can form a good interface with soil particles and cement particles. This interface optimization effect enhances the bonding force between the components, so that the solidified soil can better maintain its integrity when subjected to external forces.

[0014] In a specific embodiment, the curing agent further comprises the following components in parts by weight: 1-3 parts of polyacrylate.

[0015] By adopting the above technical solution, in the fluidized solidified soil, polyacrylate can effectively disperse soil particles, increase the viscosity of the solidified soil, make it have better rheological properties, and prevent agglomeration and sedimentation between particles. It helps to reduce the flow and collapse of the solidified soil during the construction process and improve the construction efficiency and quality.

[0016] In a specific embodiment, the fiber reinforcement material includes at least one of polypropylene fiber or carbon fiber.

[0017] By adopting the above technical solution, polypropylene fiber or carbon fiber can effectively bear and transfer loads, span micro cracks in the solidified soil, prevent further expansion of cracks through bridging action, and improve the bearing capacity, deformation resistance and crack resistance of the solidified soil. Polypropylene fiber or carbon fiber can also increase the toughness and ductility of the solidified soil, so that it can better absorb energy when impacted or vibrated, reduce brittle failure, and thus reduce cracking of the solidified soil after solidification.

[0018] In a specific embodiment, the particle size of the fly ash is 28-44 μm, the particle size of the slag is 124-138 μm, and the particle size of the silica fume is 50-200 nm.

[0019] By adopting the above technical solution, the present applicant has found through experiments that by controlling the particle sizes of fly ash, slag and silica fume within the above range, the obtained solidified soil has higher strength and density after solidification, which can further prevent the solidified soil from cracking.

[0020] In a second aspect, the present application provides a method for preparing solid waste-based premixed fluidized solidified soil, which adopts the following technical solution: A method for preparing solid waste-based premixed fluidized solidified soil comprises the following steps: The fly ash, slag, silica fume, sea silt, water reducing agent, sodium hydroxide, calcium sulfoaluminate, fiber reinforcement material and phosphate are uniformly mixed to obtain a curing agent; Weigh soil, water and curing agent in proportion, mix the soil and water evenly, let stand for 24-48 hours, then stir evenly to obtain mud, mix the mud and curing agent evenly to obtain solid waste-based premixed fluidized solidified soil.

[0021] By adopting the above technical solution, the soil is first soaked in water and mixed evenly, which helps to reduce the particle size of the soil in the mud and obtain a more uniform mud. In addition, it can avoid the components in the curing agent reacting with water to form gel components first, which helps to further improve the fluidity, uniformity and strength of the solid waste-based premixed fluidized solidified soil after curing.

[0022] In summary, this application has the following beneficial effects: 1. The present application can avoid the problem of excessive stress concentration and excessive shrinkage in the solidified soil during the hydration process, thereby reducing cracking of the solidified soil after the premixed fluid state solidification.

[0023] 2. In the present application, water glass powder, tartaric acid and polyacrylate are preferably used, which can react with silicate ions in water glass to form stable complexes. These complexes can fill the pores between soil particles, improve the density of solidified soil, and reduce cracking of solidified soil. DETAILED DESCRIPTION

[0024] The present application is further described in detail below in conjunction with embodiments and comparative examples.

[0025] The present embodiment provides a solid waste-based premixed fluidized solidified soil, comprising soil, water and a solidifying agent in a weight ratio of 32:52:7.

[0026] Among them, the curing agent adopts the following components: 32kg fly ash with a particle size of 28-44μm, 35kg slag with a particle size of 124-138μm, 18kg silica fume with a particle size of 50-200nm, 12.5kg sea silt with a particle size of 0.1-0.5mm, 2kg PCE-11 polycarboxylate water reducer, 2kg sodium hydroxide, 2kg calcium sulfoaluminate, 7kg polypropylene fiber (Hongyao HY-444), and 2kg calcium phosphate.

[0027] This embodiment also provides a method for preparing solid waste-based premixed fluidized solidified soil, which comprises the following steps: According to the proportion, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber and calcium phosphate are uniformly mixed to obtain a curing agent; Weigh soil, water and curing agent in proportion, mix the soil and water evenly, let stand for 36 hours, and then stir evenly to obtain mud. Mix the mud with the curing agent and stir until uniform to obtain solid waste-based premixed fluidized solidified soil.

[0028] The only difference between this embodiment and embodiment 1 is that the curing agent adopts the following components: 20 kg of fly ash with a particle size of 34-38 μm, 40 kg of slag with a particle size of 128-132 μm, 18 kg of silica fume with a particle size of 120-160 nm, 10 kg of sea silt with a particle size of 0.1-0.5 mm, 3 kg of PCE-11 polycarboxylate water reducer, 3 kg of sodium hydroxide, 3 kg of calcium sulfoaluminate, 10 kg of polypropylene fiber (Hongyao HY-444), and 3 kg of calcium phosphate.

[0029] The only difference between this embodiment and embodiment 1 is that the curing agent adopts the following components: 40 kg of fly ash with a particle size of 34-38 μm, 47 kg of slag with a particle size of 128-132 μm, 6 kg of silica fume with a particle size of 120-160 nm, 15 kg of sea silt with a particle size of 0.1-0.5 mm, 1 kg of PCE-11 polycarboxylate water reducer, 1 kg of sodium hydroxide, 1 kg of calcium sulfoaluminate, 3 kg of polypropylene fiber (Hongyao HY-444), and 1 kg of calcium phosphate.

[0030] The only difference between this embodiment and embodiment 1 is that the curing agent adopts the following components: 40kg fly ash with a particle size of 34-38μm, 30kg slag with a particle size of 128-132μm, 18kg silica fume with a particle size of 120-160nm, 15kg sea silt with a particle size of 0.1-0.5mm, 2kg PCE-11 polycarboxylate water reducer, 2kg sodium hydroxide, 2kg calcium sulfoaluminate, 4kg polypropylene fiber (Hongyao HY-444), and 2kg calcium phosphate.

[0031] The only difference between this embodiment and embodiment 1 is that the weight ratio of soil, water and curing agent is 28:50:6.

[0032] The only difference between this embodiment and embodiment 1 is that the weight ratio of soil, water and curing agent is 36:54:9.

[0033] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 0.4kg of water glass powder (CAS No.: 1344-09-8, 120 mesh). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and water glass powder are mixed uniformly according to the ratio to obtain a curing agent.

[0034] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 0.2kg of water glass powder (CAS No.: 1344-09-8, 120 mesh). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and water glass powder are mixed uniformly according to the ratio to obtain a curing agent.

[0035] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 0.6kg of water glass powder (CAS No.: 1344-09-8, 120 mesh). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and water glass powder are mixed uniformly according to the ratio to obtain a curing agent.

[0036] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, 0.4kg of water glass powder (CAS No.: 1344-09-8, 120 mesh), and 0.3kg of tartaric acid. In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate, water glass powder and tartaric acid are mixed uniformly according to the ratio to obtain a curing agent.

[0037] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 2kg of nano calcium carbonate (Liangde Nano D-3000A). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and nano calcium carbonate are mixed uniformly according to the ratio to obtain a curing agent.

[0038] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 1kg of nano calcium carbonate (Liangde Nano D-3000A). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and nano calcium carbonate are mixed uniformly according to the ratio to obtain a curing agent.

[0039] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 3kg of nano calcium carbonate (Liangde Nano D-3000A). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and nano calcium carbonate are mixed uniformly according to the ratio to obtain a curing agent.

[0040] The only difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32 kg of fly ash with a particle size of 34-38 μm, 35 kg of slag with a particle size of 128-132 μm, 18 kg of silica fume with a particle size of 120-160 nm, 12.5 kg of sea silt with a particle size of 0.1-0.5 mm, 2 kg of PCE-11 polycarboxylate water reducer, 2 kg of sodium hydroxide, 2 kg of calcium sulfoaluminate, 7 kg of polypropylene fiber (Hongyao HY-444), 2 kg of calcium phosphate, 0.4 kg of water glass powder (CAS No.: 1344-09-8, 120 mesh), 0.3 kg of tartaric acid, and 2 kg of nano calcium carbonate (Liangde Nano D-3000A). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylic acid water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate, water glass powder, tartaric acid and nano calcium carbonate are mixed uniformly according to the proportion to obtain a solidifying agent.

[0041] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 2kg of sodium polyacrylate (Polyhe Biological kgB29948). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and sodium polyacrylate are mixed uniformly according to the ratio to obtain a curing agent.

[0042] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 1kg of sodium polyacrylate (Polyhe Biological kgB29948). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and sodium polyacrylate are mixed uniformly according to the ratio to obtain a curing agent.

[0043] The difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 34-38μm, 35kg of slag with a particle size of 128-132μm, 18kg of silica fume with a particle size of 120-160nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), 2kg of calcium phosphate, and 3kg of sodium polyacrylate (Polyhe Biological kgB29948). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate and sodium polyacrylate are mixed uniformly according to the ratio to obtain a curing agent.

[0044] The only difference between this embodiment and embodiment 1 is that the curing agent uses the following components: 32 kg of fly ash with a particle size of 34-38 μm, 35 kg of slag with a particle size of 128-132 μm, 18 kg of silica fume with a particle size of 120-160 nm, 12.5 kg of sea silt with a particle size of 0.1-0.5 mm, 2 kg of PCE-11 polycarboxylate water reducer, 2 kg of sodium hydroxide, 2 kg of calcium sulfoaluminate, 7 kg of polypropylene fiber (Hongyao HY-444), 2 kg of calcium phosphate, 0.4 kg of water glass powder (CAS No.: 1344-09-8, 120 mesh), 0.3 kg of tartaric acid, 2 kg of nano calcium carbonate (Liangde Nano D-3000A), and 3 kg of sodium polyacrylate (Polyhe Bio kgB29948). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylic acid water reducer, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber, calcium phosphate, water glass powder, tartaric acid, nano calcium carbonate and sodium polyacrylate are mixed uniformly according to the proportion to obtain a curing agent.

[0045] The only difference between this embodiment and embodiment 1 is that the particle size of fly ash is 20-28 μm, the particle size of slag is 114-124 μm, and the particle size of silica fume is 15-45 nm.

[0046] The only difference between this embodiment and embodiment 1 is that the particle size of fly ash is 46-58 μm, the particle size of slag is 140-154 μm, and the particle size of silica fume is 210-300 nm.

[0047] Comparative Example Comparative Example 1 The only difference between this comparative example and Example 1 is that the weight ratio of soil, water and curing agent is 26:48:5.

[0048] Comparative Example 2 The only difference between this comparative example and Example 1 is that the weight ratio of soil, water and curing agent is 38:56:10.

[0049] Comparative Example 3 The difference between this comparative example and Example 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 28-44μm, 35kg of slag with a particle size of 124-138μm, 18kg of silica fume with a particle size of 50-200nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 4kg of PCE-11 polycarboxylate water reducer, 2kg of calcium sulfoaluminate, 7kg of polypropylene fiber (Hongyao HY-444), and 2kg of calcium phosphate. In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, calcium sulfoaluminate, polypropylene fiber, and calcium phosphate are uniformly mixed according to the ratio to obtain a curing agent.

[0050] Comparative Example 4 The difference between this comparative example and Example 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 28-44μm, 35kg of slag with a particle size of 124-138μm, 18kg of silica fume with a particle size of 50-200nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 4kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 7kg of polypropylene fiber (Hongyao HY-444), and 2kg of calcium phosphate. In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, polypropylene fiber, and calcium phosphate are uniformly mixed according to the ratio to obtain a curing agent.

[0051] Comparative Example 5 The difference between this comparative example and Example 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 28-44μm, 42kg of slag with a particle size of 124-138μm, 18kg of silica fume with a particle size of 50-200nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 2kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, and 2kg of calcium phosphate. In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, and calcium phosphate are uniformly mixed according to the ratio to obtain a curing agent.

[0052] Comparative Example 6 The difference between this comparative example and Example 1 is that the curing agent uses the following components: 32kg of fly ash with a particle size of 28-44μm, 35kg of slag with a particle size of 124-138μm, 18kg of silica fume with a particle size of 50-200nm, 12.5kg of sea silt with a particle size of 0.1-0.5mm, 4kg of PCE-11 polycarboxylate water reducer, 2kg of sodium hydroxide, 2kg of calcium sulfoaluminate, and 7kg of polypropylene fiber (Hongyao HY-444). In the preparation method of solid waste-based premixed fluidized solidified soil, fly ash, slag, silica fume, sea silt, polycarboxylate water reducer, sodium hydroxide, calcium sulfoaluminate, and polypropylene fiber are mixed uniformly according to the ratio to obtain a curing agent.

[0053] Performance testing For the solid waste-based premixed fluidized solidified soil samples prepared in Examples 1-20 and Comparative Examples 1-6, the initial slump, 7d compressive strength and 7d shrinkage of the samples were tested according to T / BkgEA001-2019 "Technical Standard for Premixed Fluidized Solidified Soil Filling Engineering": The test results are shown in Table 1.

[0054] Table 1 Group Initial slump / mm 7d compressive strength / MPa 7d shrinkage rate / % Example 1 230 6.8 0.24 Example 2 224 6.2 0.28 Example 3 234 7 0.26 Example 4 231 6.4 0.25 Example 5 220 6.4 0.28 Example 6 236 6.0 0.29 Example 7 222 7.4 0.16 Example 8 225 7.1 0.21 Example 9 220 7.6 0.15 Example 10 220 7.9 0.13 Embodiment 11 223 7.7 0.20 Example 12 226 7.4 0.22 Embodiment 13 221 7.8 0.18 Embodiment 14 218 9.4 0.10 Embodiment 15 226 7.0 0.22 Example 16 228 6.9 0.23 Embodiment 17 225 7.1 0.20 Embodiment 18 216 9.6 0.08 Embodiment 19 224 6.4 0.29 Embodiment 20 242 7.1 0.22 Comparative Example 1 214 6.2 0.34 Comparative Example 2 238 5.7 0.31 Comparative Example 3 213 4.6 1.24 Comparative Example 4 215 4.8 1.36 Comparative Example 5 218 5.2 0.94 Comparative Example 6 207 3.2 1.62 It can be seen from Examples 1, 5-6 and Comparative Examples 1-2 and Table 1 that compared with Example 1, the initial slump and 7d compressive strength of Comparative Examples 1-2 are significantly reduced, and the 7d shrinkage rate is significantly increased, which shows that the weight ratio range of soil, water and curing agent used in Examples 1 and 5-6 can help improve the fluidity and compressive strength of the cured soil and reduce the shrinkage rate, thereby helping to reduce cracking of the premixed fluidized cured soil.

[0055] Combining Example 1 and Comparative Examples 3-6 and Table 1, it can be seen that compared with Example 1, the initial slump and 7d compressive strength of Comparative Examples 3-6 are significantly reduced, and the 7d shrinkage rate is significantly increased. This shows that according to the raw material ratio of Example 1, that is, sodium hydroxide, calcium sulfoaluminate, polypropylene fiber and calcium phosphate are used at the same time, the fluidity and compressive strength of the solidified soil can be improved, and the shrinkage rate can be reduced.

[0056] It can be seen from Examples 1-4 and Table 1 that Examples 1-4 all have higher initial slump and 7d compressive strength, and lower 7d shrinkage, which indicates that the raw material ratios within the range of Examples 1-4 are helpful in reducing cracking of premixed fluidized solidified soil.

[0057] Combining Examples 1, 7-18 and Table 1, it can be seen that compared with Example 1, the initial slump of Examples 7-18 changed less, the 7d compressive strength increased, and the 7d shrinkage rate decreased, which shows that adding water glass powder, tartaric acid, nano-calcium carbonate and polyacrylate to the curing agent can help further reduce the cracking of premixed fluidized solidified soil.

[0058] Combining Examples 1, 19-20 and Table 1, it can be seen that compared with Example 1, the initial slump and 7d compressive strength of Example 19 are reduced, and the 7d shrinkage rate is increased, while the initial slump and 7d compressive strength of Example 20 are increased, and the 7d shrinkage rate is reduced. This shows that the use of the filler particle size of Example 1 is helpful to reduce the cracking of the premixed fluidized solidified soil and enhance the density of the premixed fluidized solidified soil.

[0059] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A solid waste-based premixed fluidized solidified soil, characterized in that: The invention comprises soil, water and a curing agent in the following weight ratio of (28-36):(50-54):(6-9); based on the total weight of the curing agent, the curing agent comprises the following components in weight parts: 20-40 parts of fly ash, 30-47 parts of slag, 6-18 parts of silica fume, 10-15 parts of sea silt, 1-3 parts of water reducing agent, 1-3 parts of sodium hydroxide, 1-3 parts of calcium sulfoaluminate, 3-10 parts of fiber reinforcement material and 1-3 parts of phosphate.

2. The solid waste-based premixed fluidized solidified soil according to claim 1, characterized in that: The curing agent further comprises the following components in parts by weight: 0.2-0.6 parts of water glass powder.

3. The solid waste-based premixed fluidized solidified soil according to claim 2, characterized in that: The curing agent also includes tartaric acid.

4. The solid waste-based premixed fluidized solidified soil according to claim 1, characterized in that: The curing agent further comprises the following components in parts by weight: 1-3 parts of nano calcium carbonate.

5. The solid waste-based premixed fluidized solidified soil according to claim 1, characterized in that: The curing agent further comprises the following components in parts by weight: 1-3 parts of polyacrylate.

6. The solid waste-based premixed fluidized solidified soil according to claim 1, characterized in that: The fiber reinforcement material includes at least one of polypropylene fibers or carbon fibers.

7. The solid waste-based premixed fluidized solidified soil according to claim 1, characterized in that: The particle size of the fly ash is 28-44 μm, the particle size of the slag is 124-138 μm, and the particle size of the silica fume is 50-200 nm.

8. A method for preparing solid waste-based premixed fluidized soil according to any one of claims 1 to 7, characterized in that: The steps include: The fly ash, slag, silica fume, water reducing agent, sodium hydroxide, calcium sulphoaluminate, fiber reinforcement material and phosphate are uniformly mixed to obtain a curing agent; Weigh soil, water and curing agent in proportion, mix the soil and water evenly, let stand for 24-48 hours, then stir evenly to obtain mud, mix the mud and curing agent evenly to obtain solid waste-based premixed fluidized solidified soil.