Imerys Civil Engineering offers Sealing Bentonites, which come in a range of specifications for a variety of sealing applications for landfills, lakes and waste deposits as well as in earth construction and water engineering. Bentonite quality and installation technique will vary depending on a number of factors, including local soil quality and the presence or potential presence of pollution and any accompanying safety requirements.
Since the advent of bentonite as a landfill sealing material in the U.S. in the 1930s, the technology has evolved into a range of highly advanced applications. But the principle is the same: Bentonite has the ability to absorb seven to eight times its weight in water and retain the absorbed water even after compaction. The hydrated bentonite does not allow water to penetrate it or pass through it, thus creating an impermeable barrier. Used as a landfill liner, the bentonite protects subsoil and groundwater from seepage of harmful substances.
In its simplest application, existing soil is mixed with a certain percentage of bentonite (depending on soil properties), before being hydrated to maximum absorption and compacted. More advanced solutions include multiple barriers, or geosynthetic clay liners (GCL), where a woven textile matt is simply filled with bentonite and hydrated, providing the added advantage of ease of installation. Imerys Civil Engineering has the appropriate palette of bentonite based products and expertise to cover all requirements. Especially for GCLs, Imerys provides the appropriate qualities depending on the processing and requirements of the customer.