Development of dual capillary barrier system using recycled materials

Abstract

At the end of operation, a landfill should be covered in order to reduce water infiltration. A capillary barrier (CB) is a cover system that uses the contrast in hydraulic properties between fine and coarse-grained layers under unsaturated conditions to minimize downward water movement. The performance of a CB in the tropics is tied to its ability to remove water through lateral diversion. Therefore, increasing the lateral diversion capacity of a capillary barrier is an important research area. The use of recycled concrete (RC) and recycled asphalt pavement (RA) is widely accepted in civil engineering applications such as highway pavement construction. Since coarse-grained soil are most suitable for capillary barrier systems, RC and RA could be used as alternative materials for forming capillary barrier cover systems. However, the use of these materials in capillary barrier cover systems has never been investigated. vi