Strength and Volume Change Behavior of Expansive Soils Treated with Fly Ash
Publication: Innovations in Grouting and Soil Improvement
Abstract
The swelling, swelling pressure and moisture dependent shear strength of expansive soils pose serious problems to civil engineers. Disposal of large quantities of fly ash, which is industrial waste, poses a major ecological problem. This experimental study explores the possibility of utilizing the fly ash with or without lime for stabilizing the expansive soils to improve strength and volume change behavior. The free swell index, swell, swelling pressure and unconfined compressive strength tests have been conducted on four expansive soils (prepared by mixing bentonite with kaoline clay in different proportions) treated with fly ash (0 to 20%) and fly ash-lime (0 to 3%) admixtures. The results clearly indicate effectiveness of fly ash in reducing the expansive characteristics of such soils. These soils when treated with fly ash alone do not exhibit marked change in immediate strength. However, 7 days curing brings a remarkable increase in their strengths.
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© 2005 American Society of Civil Engineers.
History
Published online: May 7, 2012
ASCE Technical Topics:
- Ashes
- Engineering fundamentals
- Engineering materials (by type)
- Environmental engineering
- Expansive soils
- Fine-grained soils
- Fly ash
- Geomechanics
- Geotechnical engineering
- Materials engineering
- Measurement (by type)
- Pollution
- Soil dynamics
- Soil mechanics
- Soil pollution
- Soil pressure
- Soil properties
- Soil strength
- Soil treatment
- Soil water
- Soils (by type)
- Volume change
- Volume measurement
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