This paper presents the effect of inclusion of polypropylene fibres with flyash. Laboratory CBR tests, triaxial shear tests,plate load and field CBR tests were carried out to investigate the effect of fibre inclusion on the strength behaviour of
flyash. Tests were conducted on flyash with different percentages of polypropylene fibres. Laboratory CBR tests were conducted on flyash in both soaked and unsoaked conditions. The CBR value of flyash increases with increase in fibre content in both soaked and unsoaked conditions. The percentage increase in CBR value is higher at lower percentage of fibre content. Triaxial tests were conducted at optimum moisture content with 0.7 kg/cm2,1.2 kg/cm2 and 1.8 kg/cm2
confining pressures. Based on the CBR values and shear strength parameters, 0.5% fibre content is seen to be the optimum.Plate load and field CBR tests were conducted on flyash and flyash with 0.5% fibre content. The addition of
fibre to flyash shows significant improvement in CBR value, angle of internal friction and modulus subgrade reaction.
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