www.ijsrp.org Effect of Natural Coir fibres on CBR Strength of Soil

Abstract- This paper deals with an experimental study on the utilization of natural coir fibers on unpaved roads. Coir fibres provide a reinforcement action to the subgrade soil. Coir fibre is a natural material obtained from coconut husk which is commonly seen in India. Use of coir fibres improves the subgrade soil strength. Coir fibers of varying length from 0.5 to 3cm and varying percentage from 2 to 8 of total weight of soil were added with the soil and CBR test was conducted. From the test results, it was concluded that the CBR strength using coir fibre was improved and optimum fibre length obtained was 1.5cm and optimum fiber content was 5 % of total weight of soil. CCM-400 Coir Geotextile which is a woven type coir mat was placed at th, th, th and top positions of soil sample and CBR test were conducted. The results concluded that placing geotextiles at two third depth from bottom position was seems to be more effective. I