Construction procedure and technology of paving of bentonite waterproof blanket (GCL)
GCL consists of up and down two layers of geotextile and the middle bentonite.
Bentonite is a kind of natural mineral, the main component is a clay mineral called montmorillonite. It is formed by volcanic eruptions of volcanic ash, which, after metamorphism (changes in temperature, pressure and time), form a bentonite.
The bentonite waterproof blanket is mainly applicable in the following aspects:1, municipal engineering, subway, building underground works and roof reservoir seepage control.2, environmental sanitation, sanitary landfill, sewage treatment plant, industrial waste.3, water conservancy, rivers, lakes, reservoirs, dams seepage control, plugging, reinforcement.4, garden, artificial lake, golf course pond anti-seepage, etc..5, petrochemical, mining, agriculture and other fields of seepage control, corrosion protection, leak proof, reinforcement and so on.
Bentonite is mainly divided into sodium based and calcium based, because of its high expansion and low water permeability, the quality of sodium base is highThree major features are widely used in various anti-seepage fields.High expansibility: bentonite should expand at least 12 times (ASTMD5890) when it meets water.Low permeability: water permeability is only 5 * 10-9cm/sec (ASTMD 5887).Self-healing function: bentonite in water after changing into the gel to fill cracks and voidsThe lap joint mode is directly overlapped so that the uneven settlement of the pit can be settled
