Improvement in Strength and Moduli of Coal Ash Stabilized with Bentonite and Compacted at Various Unit Weights

Abstract

With the increasing demand for electricity on one hand and the depleting resources of natural gas and oil on the other, the coal industry has been working hard for satiating the demand. The use of the fossil fuel to produce electricity may be cheaper but it has its own limitations because of the amount of nondegradable waste that it generates as a byproduct. Although coal is being primarily used to produce electricity, researchers are striving to develop cost effective and environmentally safe uses of coal combustion products. The use of bottom ash generated from burning of pulverized coal to produce electricity amended with various admixtures as a structural fill and low hydraulic conductivity barriers has been studied by several researchers. In general, the fill material in the field is compacted close to the maximum dry unit weight obtained from a standard Proctor test. In this investigation, change in the strength and stiffness of PCC bottom ash samples amended with varying amount of bentonite and com...