Author : H. AL-Hameidawi, Basim
journal of kerbala university,
2016, Volume 12, Issue 1, Pages 170-177
The improvement of sub-grade has always been significant aspect in highway and geotechnical engineering fields. To strengthen the subgrade soil, the use of natural Jute fiber is advantageous because they are cheap, locally available, and biodegradable. In this paper the soil sample was compacted at its maximum dry density corresponding to its optimum moisture content in the Laboratory California Bearing Ratio (CBR) mould with and without natural Jute fiber. Natural Jute fiber sheets equal to the plan of CBR mould diameter were placed at various layers (second, fourth and fifth of soil's layers) to investigate its behaviour on CBR value. The experimental investigations were also involved natural Jute fiber coated with bitumen material to study the effect of bitumen material on the CBR value. The CBR values of soil and soil reinforced with Jute fiber were investigated in the geotechnical engineering laboratory. The results of experimental investigation showed that the inclusion of Jute fiber sheet into the soil increases the CBR value of soil. It is also observed that the placing of Jute fiber at the second layer is more effective than placing it anywhere else in the soil sample; where the CBR value increased by 80% compared with unreinforced soil. The coating of Jute fiber has not shown significant improvement in CBR value; however, it can improve the Jute fiber longevity.
Key Words: Jute Fiber, Sub-grade Soil, CBR Test, Bitumen.