Introduction of Bentonite Waterproof Blanket
Bentonite waterproof blanket is a kind of geosynthetic material, which is specially used for the artificial lake water features, landfills, underground garage, roof garden, swimming pool, oil depot, and chemical plant. Between the composite geotextile and the nonwoven fabric, the bentonite impermeable mat made by needle punching can form many small fiber spaces, and the bentonite particles cannot flow in one direction, forming a uniform high-density gel-like waterproof layer on the mat The mineralogical name of bentonite to effectively prevent water leakage is montmorillonite based on chemical composition, and natural bentonite is mainly divided into sodium and calcium.
Bentonite has the characteristics of swelling with water. When calcium bentonite swells, its swelling amount is only about 3 times its own volume, while sodium bentonite absorbs 5 times its weight when it meets water, its volume expansion is 15 -17 times, bentonite is locked in the middle of two layers of geosynthetics to protect and strengthen GCL, and GCL has a certain overall shear strength, sodium bentonite forms a high-density diaphragm underwater pressure when the thickness is about 3mm, Its water permeability is lower than × 10 × 11m / sec, which is equivalent to 100 times the density of 30cm thick clay. It has strong self-power. Because sodium bentonite is a natural inorganic material, it will not age or corrode even after a long time or changes in the surrounding environment, so the waterproof performance is long-lasting.
Bentonite is a natural inorganic material, which is harmless to the human body, has no special impact on the environment, and has good environmental performance. However, the material of the bentonite waterproof blanket is heavy and should be carried and laid with the shovel and wholesale bentonite geosynthetic clay liner lifting tools.
When installing the bentonite waterproof blanket, the outdoor air temperature should not be lower than 0 ° C or higher than 40 ° C. You must immediately squeeze all exposed edges of the bentonite waterproof blanket with sandbags or other heavy objects to prevent the wholesale GCL geosynthetic clay liner from being blown away by the wind or pulled out from the surrounding fixed trench. Bentonite waterproof blankets cannot be used in windy weather to prevent them from being blown up by the wind.