A new triple liner system for waste disposal sites was proposed and some laboratory test results on the materials used in this system were introduced. This system consists of double geomembrane sheets with an intermediate protective material made of cast in place polybutadiene urethane elastomer. It is applicable to the waste disposal sites in the land and at the sea. Laboratory test results on polyurethane elastomer are as follows: (1) It has enough viscosity and hardness which are possible to grout on the site. (2) It has high waterproofing capabilities (hydraulic conductivity, less than 10-12cm/s). The construction joint also has same level of waterproofing capabilities. (3) It has high flexibility as same as outside double geomembranes. (4) The tensile strength of construction joint is above 80% of the intact tensile strength.
Consequently, this triple liner system has enough to apply safe to waste disposal sites.
