Strength and hydraulic conductivity of sedimented ash deposits treated with lime column

This paper highlights the efficacy of lime column in improving the geotechnical characteristics of sedimented ash deposits. In this experimental investigation, large scale laboratory model of sedimented ash bed is prepared with a centrally installed lime column. After the curing periods of 30, 90, 180 and 365 days, the undisturbed specimens are collected from different radial distances like 15, 25, 35 and 45 cm and at various depths of 10, 30, 50 and 70 cm to study the improvement in various geotechnical properties. In addition, X-ray diffraction and scanning electron microscopy tests were done in order to study the effect of curing period on hydration products, strength and hydraulic conductivity of the stabilised specimens. The study indicates that lime column treatment is an effective means of increasing the unconfined compressive strength and reducing hydraulic conductivity of ash deposits along with modifying other geotechnical parameters including water content, dry density and shear parameters.