Effect on Salak Tinggi residual soil mixed Bentonite as compacted clay liner

Abstract

This paper present the result from experimental studies on using bentonite mixed with residual soil. The entire testings were performed on Salak Tinggi residual soil mixed with various percentage of bentonite content (5%, 10% and 15%). A series of laboratories were performed to investigate the effectiveness of mixed samples associated to physical properties testing such as: particle size distribution, pH, plastic index (PL), liquid limit (LL), plasticity index (PI) and linear shrinkage (LS). Meanwhile the standard proctor compaction test was conducted on mixed soil-benonite samples to determine the maximum dry density (MDD) and optimum moisture content (OMC). In addition the permeability test to determine the hydraulic conductivity was conducted at MDD condition at effective stress of 100 kPa. It was found that the addition of bentonite to the Salak Tinggi residual soil changed the physical properties result. Meanwhile, compaction results show a decrement in the MDD with increment of bentonite percentage mixed. The result also showed the bentonite mixed decreases the hydraulic conductivity value (k < 1x10−9 m/s) for Salak Tinggi soil significantly. This finding shows that by using the small amount of 5% bentonite significantly can be used as compacted of soil liner materials.