Geosynthetic Clay Liner (GCL)
Product Introduction
A Sodium-based Bentonite Waterproof Blanket, technically known as a Geosynthetic Clay Liner (GCL), is a high-performance environmental liner. It consists of a layer of high-swelling sodium bentonite clay sandwiched between two layers of geotextiles (usually a woven and a non-woven layer), which are needle-punched together to form a cohesive, "self-healing" waterproof barrier.
Structural Composition
A standard GCL is a "sandwich" of three components:
Top Layer (Non-woven Geotextile): Provides protection and allows the needle-punching fibers to lock through.
Core Layer (Natural Sodium Bentonite): The active waterproofing agent (usually applied at a rate of 4.5–5.0 kg/m²).
Bottom Layer (Woven Geotextile): Provides high tensile strength and structural integrity to the blanket.
Working Principle
How It Works: The "Self-Healing" Principle
The core of the GCL is the Sodium Bentonite, a natural clay with unique properties:
Hydration & Expansion: When sodium bentonite comes into contact with water, it can swell up to 15 to 20 times its dry volume.
Confined Compression: Because the clay is trapped between the needle-punched geotextiles and covered by soil or concrete, it cannot expand freely. Instead, it transforms into a dense, monolithic, and impermeable gelatinous layer.
Self-Healing: If the blanket is punctured (e.g., by a nail or a sharp stone), the surrounding bentonite hydrates and expands into the void, effectively "plugging" the leak automatically.
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Application Case
Application
Bentonite blankets are preferred for projects where liquid containment is critical but ease of installation is required:
1、Environmental Protection: Landfill bottom liners and caps to prevent leachate from escaping.
2、Water Conservancy: Lining for artificial lakes, irrigation canals, and reservoirs.
3、Infrastructure: Waterproofing for subway tunnels, underground garages, and building basements.
4、Ecological Restoration: Lining for wetlands and ponds where a natural (clay-based) barrier is preferred over plastic membranes.
Address
Production Center: Development Zone, Tai'an City, Shandong, China
Marketing Center: Ichi-no-Machihigashi, Sakai-ku, Sakai City, Osaka, Japan