Characterisation of Portland cement blended with pitchstone fines aiding carbon dioxide emission reduction

DSpace/Manakin Repository

Search OPUS


Advanced Search

Browse

My Account

Show simple item record

dc.contributor.author Vessalas, K
dc.contributor.author Ray, AS
dc.contributor.author Thomas, PS
dc.contributor.author Joyce, P
dc.contributor.author Haggman, J
dc.date.accessioned 2010-05-28T09:58:38Z
dc.date.issued 2008
dc.identifier.citation Australasian Institute of Mining and Metallurgy Publication Series, 2008, pp. 255 - 258
dc.identifier.isbn 9781920806873
dc.identifier.other E1 en_US
dc.identifier.uri http://hdl.handle.net/10453/10693
dc.description.abstract Climate change and global wanning present a significant challenge as unsustainable levels of greenhouse gas emissions arising from human activities continue to be emitted. The cement industry is responsible for between five and ten per cent of annual world carbon dioxide emissions; most arising from the manufacture of Portland cement (PC). An effective way of reducing emissions is by incorporating supplementary cementitious materials (SCMs) as partial PC replacements. SCMs are silicate or aluminosilicate based pozzolanic materials which, in finely divided form, combine with water and calcium hydroxide (lime), liberated by cement hydration, to form compounds exhibiting cementitious properties. Pitchstone is such an aluminosilicate and has the potential to act as an effective pozzolan for partial replacement of PC. In North Queensland, Australia, a vast deposit of pitchstone is mined and processed for expandable perlite aggregate. During the classification stage of the excavated natural material, waste pitchstone fines (PF) less than 0.5 mm in size are generated. This study evaluates the waste PF as a viable, eco-friendly pozzolan for the partial replacement of PC. The reactivity of the PF is compared to fly ash (FA), using the pozzolanic compressive strength activity index (SAI) after seven, 28, and 91 days ageing at 20 per cent and 40 per cent PC substitutions. PF was found to be comparable to FA as a pozzolan at 20 per cent PC substitution at all ages tested. However, for the 40 per cent substitution blends significant strength was only achieved at 91 days ageing for the FA blend. The pozzolanic reactivity was also investigated using thermogravimetric analysis to determine the degree of free lime present after 91 days. In all cases where an SCM was added, the free lime was observed to be consumed with increasing age.
dc.relation.hasversion Accepted manuscript version en_US
dc.title Characterisation of Portland cement blended with pitchstone fines aiding carbon dioxide emission reduction
dc.type Conference Proceeding
dc.parent Australasian Institute of Mining and Metallurgy Publication Series
dc.journal.number en_US
dc.publocation VIC, Australia en_US
dc.identifier.startpage 255 en_US
dc.identifier.endpage 258 en_US
dc.cauo.name SCI.Chemistry and Forensic Sciences en_US
dc.conference Verified OK en_US
dc.for 0303 Macromolecular and Materials Chemistry
dc.personcode 960405
dc.personcode 860311
dc.personcode 999348
dc.percentage 100 en_US
dc.classification.name Macromolecular and Materials Chemistry en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom International Congress for Applied Mineralogy en_US
dc.date.activity 20080908 en_US
dc.location.activity Brisbane en_US
dc.description.keywords en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group /University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Faculty of Science/School of Chemistry and Forensic Science
pubs.organisational-group /University of Technology Sydney/Strength - Built Infrastructure
pubs.organisational-group /University of Technology Sydney/Strength - Management and Organisation Studies


Files in this item

This item appears in the following Collection(s)

Show simple item record