Strength Behavior of Sedimented Gypsum Slurry

Hasan, A. Rahman and Sahdi, Fauzan and Norsuzailina, Sutan and Mijan, N. and Sinin, Hamdan (2018) Strength Behavior of Sedimented Gypsum Slurry. Geotechnical Testing Journal, 41 (6). pp. 1155-1165. ISSN 1945-7545

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Abstract

Rapid increases in the production of gypsum waste from the Flue Gas Desulphurization processnecessitates that proper impoundments be built with an adequate understanding of the strengthbehavior of the sedimented gypsum slurry. This article presents laboratory experimental resultsthat describe its physical characteristics and strength behavior. The physical characterizationincludes a particle size analysis and specific gravity of solids, which conform to ASTM standards.The strength behavior is described from a series of consolidated isotropically undrained triaxialcompression tests that is performed at six levels of effective confining stress with two tests foreach effective confining stress. The results and parameters are presented via critical state analysesinq-p’ande-p’spaces as well as a Mohr-Coulomb model. The analysis reveals twodistinguishable regimes during shearing, which are classified as structured and destructuredregimes, at which the sediment undergoes a change in strength behavior from being an intactstructure to becoming a broken structure. A unique critical state line is found to be unparalleledwith the isotropic compression line

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