EXPERIMENTAL ANALYSIS OF CBR VALUE OF SOIL REINFORCED WITH JUTE AND COIR FIBER FOR THE EVALUATION OF PAVEMENT THICKNESS

Life and performance of a road significantly depends on the properties of the subgrade soil. Engineers dealing with expansive and other poor strength soils have always found it challenging to construct any structure or road on such soils. Hence bulk of research in transportation sector has been directed mainly towards improving the quality and strength of soil which forms the subgrade of flexible pavements. In this paper we have tried to experimentally show improvement in the strength of the bottom most layer of flexible pavement- soil subgrade; using two different fibers, coir and jute. Different proportions and length of the two fiber has been mixed and their effect on the CBR value of locally available soil has been studied. We have shown that CBR value increases to some extent with the increase in fiber content and then decreases. Further, with the help of an arbitrary problem, we have shown that thickness of soil subgrade reinforced with jute and coir fiber is less than unreinforced soil subgrade