What is Bentonite waterproofing? Explain in details with application procedure and typical use.
Bentonite waterproofing involves the use of sodium bentonite, a naturally occurring clay mineral, to create a barrier against water intrusion in construction structures. Bentonite is mixed with water to form a slurry that can be applied to the surface of a structure to create a waterproof barrier.
The application procedure for bentonite waterproofing typically involves the following steps:
- Surface preparation: The surface to be waterproofed must be clean, dry, and free of any contaminants that could affect the adhesion of the bentonite slurry.
- Installation of a waterproof membrane: A waterproof membrane, such as a plastic sheet, is typically installed on the surface to create a barrier against water.
- Mixing of the bentonite slurry: Sodium bentonite is mixed with water to form a slurry, following the manufacturer’s instructions.
- Application of the bentonite slurry: The bentonite slurry is applied to the surface, and is typically worked into the surface using a trowel or roller to ensure complete coverage.
- Curing: The bentonite slurry must be allowed to cure and dry completely, which typically takes several hours to a few days.
Typical uses of bentonite waterproofing include:
- Foundation waterproofing: Bentonite can be used to waterproof basement walls and foundations, creating a barrier against water intrusion.
- Waterproofing of underground structures: Bentonite can be used to waterproof underground structures such as parking garages, tunnels, and retaining walls.
- Waterproofing of retaining walls: Bentonite can be used to waterproof retaining walls, preventing water from seeping behind the wall and causing damage.
Bentonite waterproofing offers a number of benefits, including ease of application, natural resistance to water, and the ability to provide a continuous, watertight barrier. However, care must be taken during the application process to ensure that the bentonite slurry is applied evenly and in sufficient quantity to provide a continuous, watertight seal. Additionally, the sodium bentonite may need to be replaced periodically to maintain its effectiveness.