A WATER AND/OR OIL-IMPERMEABLE SEALING MAT CONSISTING SUBSTANTIALLY OF A SUBSTRATE LAYER, A LAYER OF SWELLABLE CLAY AND A COVER LAYER

摘要

A water and/or oil-impermeable sealing mat is provided in form of a bentonite non-woven fabric combination with the possibility of transmitting shear from one batt layer to the other, i.e. on a slope shearing forces can be transmitted by the covering batt material through the layer of swellable clay into the supporting batt material. Such a sealing mat is a fiber-reinforced mineral seal permitting the transmission of shearing forces on slopes, without the risk of the layer of swellable clay itself becoming the preferred sliding plane. The sealing mat consists of a non-woven textile material as substrate layer, a layer of swellable clay, preferably sodium bentonite, and a cover layer consisting preferably also on a non-woven textile material, all three layers having been needlepunched together in the conventional manner in a needle loom. When moistened, the clay swells and forms the water and/or oil-impermeable layer. The water and/or oil-impermeable sealing mat is used especially in hydraulic engineering and in waste disposel engineering.