Dispersant for Premixed Fluidized Soil Mixing
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Solution Overview
Problem
The existing methods for producing premixed fluidized solidified soil from mucky cohesive soil are hindered by high construction costs and long construction periods due to the soil's poor fluidity, high moisture content, and strong adsorption forces, which result in incomplete mixing and reduced strength of the final product.
Innovation Solution
A dispersant comprising an anti-adhesion water reducer compounded with an inorganic dispersant and an aminosulfonic acid-based superplasticizer (ASP) is used to improve the fluidity and dispersion of mucky cohesive soil, reducing adsorption forces and water consumption, thereby facilitating in-situ production of premixed fluidized solidified soil with enhanced strength and pouring properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mucky cohesive soil is used for in-situ production of premixed fluidized solidified soil, then construction cost and construction period are reduced, but the soil's poor fluidity and strong adsorption forces cause cohesive soil particles to adsorb on mixing equipment blades, forming mud balls and preventing complete mixing
Solution Approach 1:
The patent introduces a dispersant as an intermediary substance to mediate between the cohesive soil particles and the mixing equipment. The dispersant reduces adsorption forces between soil particles and metal surfaces, preventing mud ball formation on blades and ensuring complete mixing while enabling in-situ production efficiency
Solution Approach 2:
The patent changes the chemical parameters of the soil system by adding a dispersant that modifies the surface properties of cohesive soil particles. This reduces the adsorption force parameter between soil particles and mixing equipment, transforming the soil from a state that forms mud balls to one that mixes completely
2Ease of operation
If dispersant is added to reduce adsorption forces and improve fluidity, then mixing completeness and fluidity are improved, but water consumption increases which may affect groutability and strength of the premixed fluidized solidified soil
Solution Approach 1:
The patent optimizes the water content parameter within a specific range (85-95 parts) to achieve the desired fluidity improvement without excessive water consumption. This balanced parameter setting ensures both mixing effectiveness and maintenance of groutability and strength properties
Solution Approach 2:
The patent uses a composite dispersant system containing multiple components (inorganic dispersant, aminosulfonic acid-based superplasticizer, and stabilizer) that work synergistically to improve fluidity through chemical mechanisms rather than relying solely on increased water content, thus controlling overall water consumption
3Ease of operation
If high water content is used to improve fluidity of mucky cohesive soil slurry, then pouring requirements are met, but groutability and strength of the premixed fluidized solidified soil are compromised
Solution Approach 1:
The patent optimizes the water content parameter within a specific range (85-95 parts) to achieve the desired fluidity improvement without excessive water consumption. This balanced parameter setting ensures both mixing effectiveness and maintenance of groutability and strength properties
Solution Approach 2:
The dispersant acts as an intermediary that enables fluidity improvement through chemical dispersion mechanisms rather than relying on excessive water addition. This allows achieving pouring requirements while maintaining adequate strength by minimizing the water needed for fluidity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dispersant effectively reduces the adsorption of cohesive soil particles on mixing equipment, enhances the fluidity and strength of the soil slurry, and lowers production costs, enabling efficient in-situ preparation of premixed fluidized solidified soil that meets fluidity and strength requirements.
Implementation Method 1
The inorganic dispersant has low cost but poor dispersion effect. The inorganic dispersant can ionize in the slurry, thereby thickening an electric double layer. In this way, a repulsive force between the particles is improved
Implementation Method 2
The inorganic dispersant can ionize in the slurry, thereby thickening an electric double layer. In this way, a repulsive force between the particles is improved, thereby improving fluidity of the slurry
Implementation Method 3
A solution of the dispersant is used in combination with a foaming agent. In this patent, the combination of the dispersant and the foaming agent has rapid penetration, adsorption, and decomposition effects on clay particles
Data Source
AI summary
A dispersant for premixed fluidized solidified soil includes the following raw materials in parts by weight: 5 parts to 15 parts of an anti-adhesion water reducer, 0.5 parts to 0.8 parts of a stabilizer, and 85 parts to 95 parts of water. The anti-adhesion water reducer is compounded by an inorganic dispersant and an aminosulfonic acid-based superplasticizer (ASP), and the inorganic dispersant is at least one selected from the group consisting of sodium silicate, sodium hexametaphosphate, and sodium pyrophosphate. In the present disclosure, on the premise of improving fluidity of mucky cohesive soil slurry, a strength of the fluidized solidified soil at each stage is adjusted through a water-reducing effect of the anti-adhesion water reducer. Moreover, rapid dispersion of the mucky cohesive soil slurry is realized, thus providing key technical support for preparation of the premixed fluidized solidified soil from undisturbed soil in non-dry conditions.