Soil improvement agent suitable for grounding works in high soil resistivity environments

Abstract

The invention discloses a soil improvement agent suitable for grounding works in high soil resistivity environments, which comprises the following components in percentage by weight: 14-18wt% of modified starch super absorbent resin with the molecular weight of 20,000-40,000, 42-52wt% of 150-200 meshed cryptocrystalline graphite powder, 26-38wt% of calcium-magnesium-based soil gelling agent (calcium-magnesium-based bentonite), 2-4wt% of calcium-aluminum-based soil affinity agent (calcium-aluminum hydroxide mixture), 1-3wt% of soil blowing agent (sodium silicate), 1-3wt% of zinc metal preservative, and 1-3wt% of lanthanide rare earth metal slag. The soil improvement agent disclosed by the invention utilizes the water absorption characteristic of the super absorbent resin to achieve the purpose of preservation of soil moisture, utilizes the electrical conductivity of the graphite material to reduce the contact resistance between the metal conductors and soil, adds a soil gelling agent and other components to result in a more compact and stable transition conducting layer, adds the lanthanide rare earth metal slag to enhance the electrical conductivity, and adds the zinc metal preservative to prolong the service life. The soil improvement agent is especially suitable for soil improvement in geological environments with high soil resistivity and extremely-droughty geological environments.

Description

technical field [0001] The invention relates to a power-frequency grounding resistance material for a grounding grid, in particular to a material for reducing resistance and preserving moisture in grounding engineering used in high soil resistivity and extremely arid geological environments. Background technique [0002] Traditional grounding engineering materials use chemical or physical resistance-reducing materials to reduce the power-frequency grounding resistance of the grounding grid to meet the equipment use requirements. This grounding resistance reduction material has the following disadvantages: 1. Serious environmental pollution: because of its material composition containing heavy metals such as mercury, lead, cadmium, arsenic, cobalt, toxic metals, and various free ions, it will be damaged after being buried underground. Pollution of underground water sources and soil; 2. Short service life: Because the material system contains chloride ion electrolyte component...

AI Technical Summary

Problems solved by technology

This grounding resistance reduction material has the following disadvantages: 1. Serious environmental pollution: because of its material composition containing heavy metals such as mercury, lead, cadmium, arsenic, cobalt, toxic metals, and various free ions, it will be damaged after being buried underground. Pollution of underground water sources and soil; 2. Short service life: Because the material system contains chloride ion electrolyte components, the corrosion of steel is relatively serious, making the average service life less than 15 years; 3. Low resistance reduction efficiency: the material mainly It is used to reduce the power-frequency grounding resistance of the grounding system, but the effective resistance-reducing efficiency of all kinds of grounding resistance-reducing materials is less than 40%, resulting in excessive dosage and high engineering cost; 4. Poor durability in harsh soil environment: The current similar materials cannot solve the problem of ground resistance reduction in extreme arid soil environment and permafrost environment