Overview
Bentonite for subgrade engineering is a naturally occurring clay composed primarily of montmorillonite, known for its exceptional water absorption and swelling properties. It is extensively used in civil engineering projects to enhance soil stability, reduce permeability, and prevent water infiltration. This material is favored for its ability to form impermeable barriers when hydrated, making it ideal for applications such as landfill liners, tunnel construction, and road subgrades. Its plasticity and cohesion-improving qualities also make it a cost-effective solution for ground improvement.
Physical and Chemical Properties
Subgrade bentonite exhibits a high cation exchange capacity (CEC) and a layered silicate structure, which allows it to absorb water and swell up to 15 times its dry volume. Its colloidal suspensions exhibit thixotropic behavior, transitioning between gel and liquid states under stress. Chemically, it is inert and resistant to most acids and alkalis, ensuring long-term stability in harsh environments. The material’s low permeability (hydraulic conductivity <10⁻⁹ m/s) is critical for waterproofing applications.
Main Applications
In subgrade engineering, bentonite is primarily used for soil stabilization, where it binds loose particles to create a cohesive, load-bearing layer. It is also a key component in slurry walls and trench cutoffs for groundwater control. Other applications include sealing ponds and reservoirs, backfilling boreholes, and as a lubricant in tunnel boring machines. Its environmental compatibility makes it suitable for eco-friendly construction projects.
Safety and Storage
While bentonite is non-toxic, prolonged exposure to dust may cause respiratory irritation. Proper storage in moisture-proof bags or silos is essential to maintain its swelling properties. Workers should use dust masks and goggles during handling. Spills should be cleaned promptly to prevent slip hazards. The material is non-flammable and poses minimal environmental risks.
B2B Procurement Guide
When procuring bentonite for subgrade projects, prioritize suppliers who provide certified test reports for swelling index, moisture content, and particle size. Bulk purchases (20+ metric tons) often qualify for discounts. Consider logistics: proximity to the construction site reduces transportation costs. For specialized applications (e.g., high-speed rail projects), opt for sodium bentonite with a swelling index ≥30 mL/2g.
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