Abstract:
High-density claystone mixtures have been suggested as liners in radioactive waste
repositories. However, this material can also be used as a liner in landfills. This study focuses on
swelling characteristics of compacted claystone-bentonite at a low density for landfill
applications. Claystone was taken from the Banjarbakula landfill project in Banjarbaru. The
bentonite used is a commercially available bentonite from Indonesia. Claystone was mixed with
5, 10, 15, and 20% of bentonite on a dry weight basis. The mixture was statically compacted
with moisture contents of 10, 15, and 20% to achieve a dry density of 16 kN/m3
. A swell-load
test was carried out using conventional oedometer equipment to obtain the swelling potential and
swelling pressure of the samples. The results show that the swelling potential and swelling
pressure increased with an increase in bentonite contents. At a bentonite content of more than
10%, both increased significantly. This research also revealed a linear relationship between
swelling potential and swelling pressure.
