A COMPARATIVE STUDY ON THE EFFECT OF SISAL FIBRE AND WASTE PLASTIC STRIPS IN STRUCTURAL STRENGTH IMPROVEMENT OF TROPICAL BLACK CLAY

A study on the effect of sisal fibre and waste plastic strips tropical black clay (also called Black cotton soil, BCS) was carried out. Tests piloted natural treated soil consist California bearing ratio (CBR), Atterberg limits compaction for different percentages inclusion (0, 0.5, 1, 1.5 2%) by dry weight soil. Results obtained showed that liquid limit BCS initially fluctuated between 43.4% 55.9% at 1% content, then dropped to 49.4% 2% content. In case with strips, values increased from a highest value 58% thereafter decreased 49.15% Plastic both BCS-sisal fibre/ its 25.78 15.55 14.77% when respectively 0.5% admixtures plasticity index, increase 17.66% peak 35.39 43.23% respectively, decreased. Maximum density (MDD) 1.55 mg/m3 0%, 1.60 1.53 samples strips. The MDD progressively as amount increased. OMC show an overall trend fibre, general decrease CBR lessened their 13.59% 4.76% subsequently 10.57% fibre. Similar behaviour observed modified Based results, BCS/waste improved more than BCS/sisal is recommended optimal geotechnical engineering application such road payment.