Published Paper Details:

The performance of pavement is very responsive to the characteristics of the flyash subgrade. For that reason, weak subgrade is enhanced by adopting the most efficient stabilization technique. Based on the literature review, stabilization with crusher dust activated with cement was found to be an effective option for improvement of flyash properties. In this regard an experimental program was undertaken to study the effect caused by the combined action of crusher dust and cement stabilization on the geotechnical characteristics of weak subgrade flyash. Flyash treated with varying percentages of crusher dust, 0, 5, 10, 15, and 20 percent combined with 5% cement content were studied. Consistency limits, compaction, California Bearing Ratio and permeability tests were conducted on treated and untreated flyash. The experimental results show that addition of cement crusher dust admixture to the flyash has great influence on its properties. It was found that the optimum dosage of crusher dust is 25% mixed with 5% cement revealed in significant improvement in strength and durability and reduction in permeability and liquid limit properties of the flyash. Based on the results, it is recommended that cement-crusher dust admixture be considered a viable option for the stabilization of subgrade.