Pitchstone fines pozzolanic activity assessment as partial Portland cement (PC) replacements

Publisher:
Australasian Ceramic Society
Publication Type:
Journal Article
Citation:
Journal of Australasian Ceramic Society, 2009, 44 (1), pp. 7 - 12
Issue Date:
2009-01
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Mined pitchstone fines (PF), derived as a waste by-product from expandable perlite production in Australia, are a viable, environmentally friendly aluminosilicate supplementary cementitious material (SCM) suitable for partial Portland cement (PC) replacement, thus reducing greenhouse gas emissions resulting from PC manufacture. This paper reports on the findings of pozzolanic activity exhibited at 10%, 20% and 40% replacement levels of PC, through compressive strength determinations of mortar after 1, 7 and 28 days ageing, using strength activity index (SAI) criteria. Additionally, flows and wet densities have been examined using a polycarboxylic based high-range water-reducing admixture (HRWRA) superplasticiser and fixed water content relative to cementitious material present for all PF substitution levels.
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