Abstract
The present study discusses about the effect of adding coir fibres in poor soil in various percentages (i.e. 0.15%, 0.30%, 0.60%, 0.90%, 1.20% and 1.5%) on the strength, thickness and cost of low volume rural roads under PMGSY. Soil sample comes under clay of high compressibility (CH) category and contains substantial amount of finer particles. Laboratory California Bearing Ratio (CBR) and compaction tests are performed for various reinforcement conditions. Upto 0.90% fibre reinforcement, improvement in CBR and dry density is reported and beyond that it decreases. The thickness of pavement is determined as per design catalogues provided in IRC:SP:72-2015. Maximum cost reduction of 21% and 19% in pavement construction corresponding to traffic category T-6 and T-9, respectively, is reported when reinforced with 0.90% coir fibres.
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