Details of waterproofing of GCL.First of all, if there is water on the ground, then you must stop working and drain first. Similarly, if water vapor appears on the ground, it is necessary to take precautionary measures for drainage and pave the way for the next work to prevent early hydration of the bentonite cushion.
In order to prevent early hydration due to rain, the cement mortar 3-5cm thick should be laid after the construction of the cushion layer to prevent the early hydration of the waterproof layer in contact with water. In general, the total compacted volume of liming soil is not less than 10cm.
The GCL must overlap at least 10cm of the main body part and 15cm side, and can be fixed with nails (also bamboo nails) and washers at 30cm intervals. After the construction of the GCL, the construction personnel must pay attention to prevent the damage of the bentonite cushion.
Before proceeding to the next process, check whether the bentonite waterproof layer is lost. If there is any loss or damage, use sealant or bentonite powder to repair. In order to increase the watertightness of the overlapping part of the bentonite pad, it can be reinforced by using bentonite powder or a bentonite sealant.
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