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Structural behaviour of an Australian silty clay (Coode Island silt) stabilised by treatment with slag lime
journal contribution
posted on 2023-05-19, 22:50 authored by Falah, M, Pouya, KR, Ali TolooiyanAli Tolooiyan, Mackenzie, KA 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 80–85 wt% slag, 15 wt% hydrated lime, Ca(OH)2 and 3–8 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.
History
Publication title
Applied Clay ScienceVolume
157Pagination
198-203ISSN
0169-1317Department/School
School of EngineeringPublisher
Elsevier Science BvPlace of publication
Po Box 211, Amsterdam, Netherlands, 1000 AeRights statement
Copyright 2018 Elsevier B.V.Repository Status
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