Abstract
Lime leachability is one of the major concerns in the utilization of fly ashes for many applications since it affects the long term durability and performance. In this paper lime leachability behaviors of two low lime fly ashes have been studied using specially fabricated moulds under continuous leaching conditions. The leachability of each fly ash with different lime and gypsum contents added to improve the pozzolanic activity has been studied after curing the compacted specimen for 7 and 14 days. It is observed that, the ratio of lime leached to the total lime added decreases with increase in the lime content. The leachability of lime from fly ashes reduces significantly in the presence of gypsum. The reduction in the lime leachability has been attributed to the formation of calcium silicate hydrate. The steep reduction in the presence of gypsum is due to the formation of calcium aluminate silicate hydrate apart from calcium silicate hydrate. Good correlations have been observed between the lime leachability ratio and various geotechnical properties, viz., soaked unconfined compressive strength, compressibility and hydraulic conductivity.
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