Using bottom ash as filler material in fine-grained dredged marine soil solidification: determination of optimal dosage

Chan, Chee-Ming and Azhar, Amira (2015) Using bottom ash as filler material in fine-grained dredged marine soil solidification: determination of optimal dosage. Electronic Journal of Geotechnical Engineering, 20 . pp. 12525-12533. ISSN 1089-3032

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Abstract

Dredged marine soils (DMS) are the sediments and debris removed during the dredging processes. In Malaysia, DMS are considered a waste and currently not being recycled or reused. This is due to the poor engineering properties of the material, i.e. low strength and high compressibility. Therefore some form of pre-treatment measures, such as solidification of DMS needs to be taken before DMS can be reused. Soil solidification involves the use of solidification agents or binders admixed with the soil to improve its load-bearing performance. This paper describes a lab-based attempt to determine the optimal binder-filler dosage for solidifying 2 DMS samples from Malaysian waters. The DMS were collected from dredge sites in Melaka and Kelantan, while the binder used was ordinary Portland cement (C) and the filler bottom ash (BA) retrieved from a local coal power plant. The standard unconfined compression test was conducted to gauge the material’s improved strength admixed with a range of cement and bottom ash blends. The optimal dosage of BA or filler for effective solidification of the DMS was found to be 25 %. With higher BA dosages strength of the treated DMS would increase till it peaked at the optimal dosage. After exceeding the optimal BA dosage, the strength was observed to decrease rather dramatically. In conclusion, BA can be effectively used as a filler material at an optimal dosage to reduce the amount of cement required for solidification of DMS.

Item Type:Article
Uncontrolled Keywords:dredged marine soils; coal bottom ash; solidification; filler; optimal dosage; strength
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA703-711 Engineering geology. Rock mechanics. Soil mechanics.
Divisions:Faculty of Engineering Technology > Department of Civil Engineering Technology
ID Code:7421
Deposited By:Normajihan Abd. Rahman
Deposited On:02 Feb 2016 16:51
Last Modified:02 Feb 2016 16:51

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