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Structural behaviour of an Australian silty clay (Coode Island silt) stabilised by treatment with slag lime

Citation

Falah, M and Pouya, KR and Tolooiyan, A and Mackenzie, K, Structural behaviour of an Australian silty clay (Coode Island silt) stabilised by treatment with slag lime, Applied Clay Science, 157 pp. 198-203. ISSN 0169-1317 (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Elsevier B.V.

DOI: doi:10.1016/j.clay.2018.02.045

Abstract

A microstructural study of Coode Island Silt (CIS), a soft silty clay from the Melbourne area of Australia, stabilised withslag lime is reported. Slag lime is a blend of 8085 wt% slag, 15 wt% hydrated lime, Ca(OH)2 and 38 wt% gypsum CaSO4.2H2O, and is typically used for soil stabilisation in roading applications. The morphologies of several homogeneous mixtures of slag lime and CIS were studied by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD), which indicated the formation of the cementitious phases calcium carbonate, calcium silicate hydrate, calcium aluminium silicate hydrate, and calcium aluminium silicate carbonate. The progress of the CIS-slag lime reactions was also investigated by pH measurements. Slag lime was found to very actively promote pozzolanic reactions with CIS, shown by SEM to form crystalline reticular calcium silicate hydrate and other cementitious products. The most effective pozzolanic reactions occurred in a composite containing 12.5 wt% slag lime with CIS and contained the cement mineral ettringite, contributing to its high strength. These composites constitute a new class of materials with excellent potential for construction applications.

Item Details

Item Type:Refereed Article
Keywords:Coode Island silt, slag lime, treatment, XRD, SEM
Research Division:Engineering
Research Group:Civil Engineering
Research Field:Civil Geotechnical Engineering
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
UTAS Author:Tolooiyan, A (Dr Ali Tolooiyan)
ID Code:129433
Year Published:2018
Web of Science® Times Cited:2
Deposited By:Engineering
Deposited On:2018-11-29
Last Modified:2018-12-05
Downloads:0

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