Influence of fly ash-based geopolymer binder on the sedimentation behaviour of dredged mud

Jaditager, Mohamed, and Sivakugan, Nagaratnam (2017) Influence of fly ash-based geopolymer binder on the sedimentation behaviour of dredged mud. Journal of Waterway, Port, Coastal, and Ocean Engineering, 143 (5). pp. 1-9.

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This laboratory study investigated the sedimentation behavior of a fly ash–based geopolymer-stabilized dredged-mud slurry extracted from the Port of Townsville, Queensland, Australia. Settling-column tests were conducted to study the sedimentation behavior of 400%-water-content dredged mud of untreated and geopolymer-stabilized slurries at 6, 12, and 18% content by weight. Dredged-mud slurry interface height movements with elapsed time were recorded, and their settling patterns were observed. Mineralogical and microstructural characteristics of dried, untreated, and geopolymer-stabilized dredged-mud sediments were determined using X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) analysis. The study found that a fly ash–based geopolymer gel coating the dredged-mud particles in the slurry led to a flocculated settling behavior, and the geopolymer stabilization reduced the overall dredged-mud slurry sedimentation duration. XRD and SEM/EDS analysis showed that the geopolymer stabilization altered the microstructure of stabilized dredged-mud sediment and reduced its desiccation shrinkage cracks.

Item ID: 48155
Item Type: Article (Research - C1)
ISSN: 1943-5460
Keywords: dredged mud; fly ash; geopolymer; land reclamation; sedimentation; stabilization
Funders: Australian Research Council (ARC)
Date Deposited: 03 Apr 2017 02:50
FoR Codes: 40 ENGINEERING > 4005 Civil engineering > 400502 Civil geotechnical engineering @ 100%
SEO Codes: 87 CONSTRUCTION > 8702 Construction Design > 870201 Civil Construction Design @ 100%
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