Evaluation of the geotechnical specification of weak problematic treated soils in the application of lime, fly-ash, and rubber waste

Articles in Press

Document Type : Research Article

Authors

1 Associated prof., Department of Civil Engineering, Islamic Azad University, Estahban Branch

2 Ph. D. candidate, Department of Civil Engineering, Estahban Branch, Islamic Azad University, Estahban, Iran,

3 Department of Civil Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran

Abstract

Some construction projects and activities inevitably have to be constructed on weak and/or on problematic soils. Sometimes the subgrade layer of the roads or the support of the buildings are made on weak clays or sand, which cannot be used, except by modifying their properties. Since the past, with the simultaneous use of lime and fly ash, the adhesion of the soil has been increased. From other point of view, increasing human attention to the environment has led to use recycled materials and industrial wastes. In this study, the effect of recycled and industrial wastes such as lime, fly ash, rubber powder, and rubber fiber have been investigated to improve the geotechnical properties of clay. Based on the experiments performed on the materials and the results of previous research, the optimal conditions for soil stabilization were determined. Then, samples containing lime and lime-fly ash with and without additives (rubber powder and rubber fibers) with optimal amounts of raw materials prepared in different percentages of additives and at different curing times underwent uniaxial tests. Finally, the geotechnical parameters such as maximum compressive strength and failure strain were reported from uniaxial experiments. Other parameters such as secant modulus, resilient modulus, and bulk modulus were calculated. The results obtained from 400 specimens showed that the lime-fly ash specimens containing rubber fibers had better performance than other samples. In the 90-day curing time, the maximum compressive strength of these samples reached over 1000 kPa, and the specimens showed more deformable properties.

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Amirkabir Journal of Civil Engineering

Articles in Press, Accepted Manuscript
Available Online from 21 July 2025

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