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RECYCLING WASTE GYPSUM IN SOIL STABILIZATION APPLICATIONS
Session: General Geotechnique and Engineering Geology / Géotechnique générale et géologie de l'ingénieur
ALY AHMED, Western Ontario University (Canada)
M. H. M. H. El Naggar, Western Ontario University, London, Ontario, Canada (Canada)
Hafiz Ahmad, Orbit Engineering Limited, Mississauga, Ontario, Canada (Canada)
Takeshi Kamei, University of Miyazaki, Miyazaki, Japan (Japan)
Solid waste management is a serious problem worldwide as amounts of produced wastes are increasing annually. For example, the disposal of gypsum waste-plasterboard, widely used as dry-wall across North America, represents a serious environmental issue. Therefore, attention is focused on using and recycling such waste as an alternative material in construction applications. This can reduce the amount of wastes that are sent to landfills, and hence leads to environmental and economic benefits. This study examines the potential of reusing gypsum wastes as a stabilizer material for earthwork projects. Recycled gypsum, mixed with cement or lime at different ratios, was used as a stabilizer for soft-fine-grained soil. Compressive strength, secant moduli, unit weight, water content and Atterberg limits tests were conducted to evaluate the improvement in stabilized soil properties. The results indicate that the inclusion of gypsum-cement or gypsum-lime admixtures improved the mechanical properties of the stabilized soil, with higher admixture concentrations leading to greater improvement. Moreover, the soil specimens stabilized using gypsum-lime admixture exhibited higher strength gain rate and reduction in plasticity index and water content than those stabilized by gypsum-cement admixture. It is concluded that the proposed stabilizing technique can be advantageous for both waste management and construction industries.
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