Effect of carbonation on high-slag binders

Tapas, MJ; Thomas, P; Sirivivatnanon, V

Effect of carbonation on high-slag binders

Tapas, MJ Thomas, P

Sirivivatnanon, V

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Publisher:: Concrete in Australia
Publication Type:: Journal Article
Citation:: Concrete in Australia, 2024, 50, (2), pp. 52-58
Issue Date:: 2024-06-01

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Field	Value	Language
dc.contributor.author	Tapas, MJ
dc.contributor.author	Thomas, P https://orcid.org/0000-0001-6962-2121
dc.contributor.author	Sirivivatnanon, V
dc.date.accessioned	2024-07-23T05:47:06Z
dc.date.available	2024-07-23T05:47:06Z
dc.date.issued	2024-06-01
dc.identifier.citation	Concrete in Australia, 2024, 50, (2), pp. 52-58
dc.identifier.issn	1440-656X
dc.identifier.issn	1440-656X
dc.identifier.uri	http://hdl.handle.net/10453/179825
dc.description.abstract	Cement production results in the significant release of CO2 into the environment. Therefore, the partial substitution of cement with supplementary cementitious materials (SCMs) is a primary strategy to reduce the upfront embodied carbon of concrete. Amongst the commercially available SCMs, ground granulated blast furnace slag (GGBFS) which has a composition closest to that of cement, allows the highest level of substitution in binary and ternary blends at ≥50%. GGBFS, other than helping lower the upfront embodied carbon, also improves most durability properties of the concrete including resistance to chlorides, sulfate and alkali-silica reaction. However, despite the known benefits, the use of high substitution levels of GGBFS has also been documented to reduce the carbonation resistance of the concrete. Carbonation is a natural process that has both detrimental and beneficial effects. Whilst carbonation results in the drop of the concrete pH increasing the susceptibility of the steel to reinforcement corrosion, it also facilitates the reabsorption of CO2 into the concrete. Owing to the increasing use of GGBFS and interest in carbonation, this paper investigates the effect of carbonation on the phase development and microstructure of high GGBFS binders. This study shows that: 1) the main driver for the drop in the pH of the pore solution during carbonation is the consumption of portlandite, 2) carbonation not only reduces the pH but also results in the decalcification of other phases and modification of the microstructure of the binder and, 3) binders with lower CaO content carbonate faster but have lower capacity to absorb CO2 per gram.
dc.language	en
dc.publisher	Concrete in Australia
dc.relation	Innovative Manufacturing Cooperative Research Centre
dc.relation.ispartof	Concrete in Australia
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	4005 Civil engineering
dc.title	Effect of carbonation on high-slag binders
dc.type	Journal Article
utslib.citation.volume	50
utslib.for	0905 Civil Engineering
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/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	recently_added	*
pubs.consider-herdc	false
dc.date.updated	2024-07-23T05:47:05Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	50
utslib.citation.issue	2

Abstract:

Cement production results in the significant release of CO2 into the environment. Therefore, the partial substitution of cement with supplementary cementitious materials (SCMs) is a primary strategy to reduce the upfront embodied carbon of concrete. Amongst the commercially available SCMs, ground granulated blast furnace slag (GGBFS) which has a composition closest to that of cement, allows the highest level of substitution in binary and ternary blends at ≥50%. GGBFS, other than helping lower the upfront embodied carbon, also improves most durability properties of the concrete including resistance to chlorides, sulfate and alkali-silica reaction. However, despite the known benefits, the use of high substitution levels of GGBFS has also been documented to reduce the carbonation resistance of the concrete. Carbonation is a natural process that has both detrimental and beneficial effects. Whilst carbonation results in the drop of the concrete pH increasing the susceptibility of the steel to reinforcement corrosion, it also facilitates the reabsorption of CO2 into the concrete. Owing to the increasing use of GGBFS and interest in carbonation, this paper investigates the effect of carbonation on the phase development and microstructure of high GGBFS binders. This study shows that: 1) the main driver for the drop in the pH of the pore solution during carbonation is the consumption of portlandite, 2) carbonation not only reduces the pH but also results in the decalcification of other phases and modification of the microstructure of the binder and, 3) binders with lower CaO content carbonate faster but have lower capacity to absorb CO2 per gram.

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http://hdl.handle.net/10453/179825