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

Vessalas, K; Ray, AS; Thomas, PS; Joyce, P; Haggman, J

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

Vessalas, K

Ray, AS Thomas, PS

Joyce, P Haggman, J

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Publication Type:: Conference Proceeding
Citation:: Australasian Institute of Mining and Metallurgy Publication Series, 2008, pp. 255 - 258
Issue Date:: 2008-12-01

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Field	Value	Language
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212	en_US
dc.contributor.author	Ray, AS	en_US
dc.contributor.author	Thomas, PS https://orcid.org/0000-0001-6962-2121	en_US
dc.contributor.author	Joyce, P	en_US
dc.contributor.author	Haggman, J	en_US
dc.date.issued	2008-12-01	en_US
dc.identifier.citation	Australasian Institute of Mining and Metallurgy Publication Series, 2008, pp. 255 - 258	en_US
dc.identifier.isbn	9781920806873	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.	en_US
dc.relation.ispartof	Australasian Institute of Mining and Metallurgy Publication Series	en_US
dc.title	Characterisation of Portland cement blended with pitchstone fines aiding carbon dioxide emission reduction	en_US
dc.type	Conference Proceeding
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
dc.location.activity	Brisbane	en_US
pubs.embargo.period	Not known	en_US
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 Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US

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.

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