Bentonite Reservoir Liner Application Methods
Bentonite may be applied to ponds using a variety of different methods such as sprinkling, mixing it with the natural soil and finally blanketing.
The bentonite may be sprinkled into the pond near areas that are suspected of leaking for the purpose of sealing them off. This is rarely effective as there is always a high probability that the bentonite will not actually land in the area where the leak actually is.
Mixing with the Native Soil
In this method, the bentonite is mixed with the soil on-site in order to modify its quality so as to reduce leakage or seeping. In order to know the amount of bentonite needed for this approach, you will need to have your soil analyzed by a soil lab (the usual mixture is approximately 5%-10% by weight bentonite/native soil). Once our analysis is done, you then would know how much bentonite you need in order to create a seal. Compared to the sprinkling approach, this method has better rates of success.
Using IEC Covers’ bentonite clay pond liner is the most cost-effective and practical approach to seal your commercial retention ponds. The bentonite may be applied as a blanket that is usually 1” to 4” thick and is then covered with a layer of soil for protection. Once properly installed, the entire site is moisturized and then compacted to achieve the sealing effect.
Passive versus Active Liners
A bentonite clay pond liner is a perfect example of an active liner. The reason it is called such is that it requires an active mechanical/chemical process that needs to take place prior to the material becoming waterproof. Bentonite on its own is simply just clay and is not yet waterproof. However, when it gets in contact with water, it then expands many times its own weight absorbing water. When it has something that it can expand against, it can create a water-tight compressive seal and it then becomes water-tight. A passive liner on the other hand does need an activation process in order to work. For instance, RPE liners are simply water-tight liners that are installed and you automatically get the desired results.