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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, K
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 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 Science

Volume

157

Pagination

198-203

ISSN

0169-1317

Department/School

School of Engineering

Publisher

Elsevier Science Bv

Place of publication

Po Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

Copyright 2018 Elsevier B.V.

Repository Status

  • Restricted

Socio-economic Objectives

Stone, ceramics and clay materials; Soils; Expanding knowledge in engineering

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