CBR Behaviour of Waste Plastic Strip-Reinforced Stone Dust/Fly Ash Overlying Saturated Clay

Authors: RAKESH KUMAR DUTTA, V. K. SARDA

Abstract: An experimental study was carried out to investigate the CBR behaviour of waste plastic strip reinforced-stone dust/fly ash overlying saturated clay. Three different sizes of waste plastic strips were used in this study. The effect of waste plastic strip content (0.25% to 4%) and length on the CBR and secant modulus of strip reinforced-stone dust/fly ash overlying saturated clay was investigated. The study reveals that addition of waste plastic strip in stone dust/fly ash overlying saturated clay resulted in an appreciable increase in the CBR and the secant modulus. The reinforcement benefit increased with an increase in waste plastic strip content and strip length. The benefit of adding waste plastic strips beyond 2% does not improve the CBR or secant modulus appreciably. Reinforced stone dust is more effective than reinforced fly ash overlying saturated clay in improving the behaviour of the system. The material can be used in base courses in constructing rural roads over saturated clay, thereby leading to safe disposal of these waste materials in an environmentally friendly manner. Further research is recommended to study the cost economics of the use of waste materials in base courses in rural roads.

Keywords: CBR, Fly ash, Saturated clay, Secant modulus, Stone dust, Waste plastic strip

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