Potential of Fly Ash to Enhance the Behaviour of Lime Treated Gypseous Soil (original) (raw)

Abstract

The practice of treating different soil with fly ash and lime is an attractive proposition and is widely applied in the field of geotechnical engineering. However, the use of fly ash to combat the susceptible behaviour of lime treated sulfate/gypseous soil is still a debatable issue, and hence, is a matter of current research. Currently, efforts are being made to identify whether fly ash has the potential to overcome deficiencies observed in lime treated gypseous soil. This study evaluates the strength and volume change behaviour of lime treated soil containing varying gypsum content with fly ash after curing for different periods. The results revealed that fly ash improves the strength of lime treated gypseous soil continuously with increase in curing periods but promotes the swell in the lime treated gypseous soil. However, the swell in lime treated gypseous soil with fly ash eliminates completely with curing period. Detailed physico–chemical and micro–analyses (mineralogical and microstructural) have been performed on the samples collected after completion of strength and swell tests to elucidate the mechanism of these behavioral changes. The evidences confirmed the formation of cementitious compounds of different composition and ettringite crystals of different amounts having different aspect ratios. However, the supply of additional alumina and silica by the fly ash to lime treated gypseous soil and water are the key factors for potential use of fly ash to improve the properties of lime treated gypseous soil.

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