A Study on Crushed Coconut Shells as Stabiliser to Soil

Abstract Road construction over soft subgrade soil is a major issue affecting cost and scheduling of highway projects. Many techniques have been conducted to strengthen the subgrade. One them are using additives such as coconut shells, rice husk ash, stone dust, fly ash. soil. The strength commonly expressed California Bearing Ratio (CBR). In this study, crushed shells (CCS) 65 mm 10 ranges size was mix with laterite A series unsoaked CBR test were an addition 1, 2, 3, 4, 5, 6, 7 8% CCS determine stabilized classified sandy SILT high plasticity (MH) according British Standard Classification System (BSCS). results show that values increase increasing percentage CCS. 4% highest value, 27.5%. CBR% then decreasing further additional %. stabilised content had lowest value at 5.25%, which lower than unstabilised soil’s value. It concluded additions greatly improved increment Hence has good potential for upgrading