Effects of Coconut Shell Ash on Lime-Stabilized Lateritic Soil

摘要

This study assesses the effects of Coconut Shell Ash (CSA) on lime-stabilized lateritic soil. Preliminary tests were carried out on the natural soil sample for identification and classification purposes, also, engineering property tests such as California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS) and Compaction were carried out on the natural soil sample. Lime being the main stabilizing material was thoroughly mixed with the natural soil sample in proportions of 2, 4, 6, 8 and 10%. The optimum lime requirement for stabilization was 6% lime content because the least value of plasticity index was recorded at this level. This value was adopted as the standard and control, thereafter, CSA was mixed with the lime-stabilized soil in proportions of 2, 4, 6, 8 and 10%. By the addition of CSA to the lime-stabilized soil, CBR increased from 53.6% at 0% CSA to 66.4% at 6% CSA. UCS increased from 345 kN/m~(2) at 0% CSA to highest value of 442 kN/m~(2) at 4% CSA by weight of soil. Values of Optimum Moisture Content (OMC) increased from 21.44% at 0% CSA to 26.10% at 10% CSA. Maximum Dry Density (MDD) decreased from 1342 Kg/m~(3) at 0% CSA to 1255 Kg/m~(3) at 10% CSA. It was therefore concluded that Coconut Shell Ash (CSA) is an effective complement for lime stabilization in lateritic soil.