The Impact of Time on the Properties of Cement-Stabilised Soil Intended for Use as Bottom Liner in Municipal Solid Waste Landfills

摘要

Classification, compaction, CBR and hydraulic tests were undertaken on soil samples obtained from two borrow pits in Ado Ekiti, Nigeria. Classification using the BS 5930 indicated soil A as clay with a high plasticity and soil B as silt with a low plasticity. Similarly, AASTHO classification indicated soil A as soil type A-7-5 and soil B as A-4. The soils were stabilised with 2.5%, 5%, 7.5% and 10% cement respectively. The maximum dry density and CBR of the stabilised soils increased with the increasing cement content andlength of timefrom mixture totesting of the composites. The saturated hydraulic conductivity of the stabilised soils decreased with increased cement content and time period totesting. More importantly, the effect of period of time to testing on the saturated hydraulic co nductivity was significant as the values of the stabilised soils with 10% cement content decreased from 4.48×10 -5 m/sto 1.09×10 -9 m/s at 28 days. It was concluded that the essential properties of the cement-stabilised soil intended for use as bottom liner in MSW landfills improved with age.