This paper discusses the results of a laboratory testing program associated withthe design a cap foundation layer for the closure of a 66-acre former effluent treatmentpond of an oil refinery. Stabilization with binder of a layer of oily refinery sedimentsand recently deposited dredged marine sediments was selected as the more appropriatetechnique to improve the strength, reduce permeability and allow for future refineryuses of the capped area, while reducing settlements and long-term grading andmaintenance issues that could potentially result from the cap placement and otherconstruction activities.Strength, compressibility, and permeability performance improvement wereachieved by using selected binder formulations and a sandy soil physical filler. Thecementing effect due to pozzolanic reaction products resulted in a structuration of thevery soft, normally consolidated sediments and in the development of a yield stressseparating small strains from large strains, which governed the compression andshearing behavior of the treated sediments. Controlled moisture and stress conditionsduring curing minimized the deterioration of sediments cemented structure due to swelland shrinkage and consequent loss of strength and permeability performance.
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