Submicroscopic Evaluation Studies to Minimize Delayed Ettringite Formation in Concrete for a Sustainable Industry and Circular Economy

Ramu, YK; Thomas, PS; Vessalas, K; Sirivivatnanon, V

Submicroscopic Evaluation Studies to Minimize Delayed Ettringite Formation in Concrete for a Sustainable Industry and Circular Economy

Ramu, YK Thomas, PS Vessalas, K

Sirivivatnanon, V

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Publisher:: Springer
Publication Type:: Chapter
Citation:: Nanotechnology in Construction for Circular Economy, 2023, 356 LNCE, pp. 445-455
Issue Date:: 2023-01-01

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Field	Value	Language
dc.contributor.author	Ramu, YK
dc.contributor.author	Thomas, PS
dc.contributor.author	Vessalas, K https://orcid.org/0000-0003-3948-5212
dc.contributor.author	Sirivivatnanon, V https://orcid.org/0000-0003-1901-6064
dc.date.accessioned	2023-10-16T05:44:45Z
dc.date.available	2023-10-16T05:44:45Z
dc.date.issued	2023-01-01
dc.identifier.citation	Nanotechnology in Construction for Circular Economy, 2023, 356 LNCE, pp. 445-455
dc.identifier.isbn	9789819933297
dc.identifier.uri	http://hdl.handle.net/10453/172703
dc.description.abstract	The high cost of maintenance, repair and retrofitting of concrete infrastructure to keep these structures durable and serviceable is not sustainable, so the design process needs to consider all aspects of deterioration mechanism/s that can potentially occur in a concrete structure. The ideal solution should contribute to sustainability by enhancing the durability of concrete elements and supporting a circular economy. We studied delayed ettringite formation (DEF), a potential deterioration mechanism, including mitigation measures, in various heat-cured cementitious systems. The results showed that continuously connected pore/crack paths at the submicroscopic level favor the transportation of DEF-causing ions in heat-cured systems. DEF increases the chance of developing cracks, which is a durability concern. To mitigate DEF, fly ash produced from an Australian bituminous coal-burning power station was incorporated in the binder to support the circular economy concept. Changes in heat-cured cementitious systems were evaluated using expansion, electrical resistivity, dynamic modulus, and microstructural studies. The pozzolanicity of fly ash was found to greatly enhance the formation of denser calcium-silica-hydrate, which in turn restricted the transportation of DEF-causing ions at the submicron level, leading to less DEF occurrence and enhancement of the durability and sustainability of concrete in field structures.
dc.format.extent	58
dc.language	en
dc.publisher	Springer
dc.relation.ispartof	Nanotechnology in Construction for Circular Economy
dc.relation.ispartofseries	Lecture Notes in Civil Engineering
dc.relation.isbasedon	10.1007/978-981-99-3330-3_45
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Submicroscopic Evaluation Studies to Minimize Delayed Ettringite Formation in Concrete for a Sustainable Industry and Circular Economy
dc.type	Chapter
utslib.citation.volume	356 LNCE
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	open_access	*
pubs.consider-herdc	false
dc.date.updated	2023-10-16T05:44:44Z
pubs.place-of-publication	Switzerland
pubs.publication-status	Published
pubs.volume	356 LNCE
dc.location	Switzerland

Abstract:

The high cost of maintenance, repair and retrofitting of concrete infrastructure to keep these structures durable and serviceable is not sustainable, so the design process needs to consider all aspects of deterioration mechanism/s that can potentially occur in a concrete structure. The ideal solution should contribute to sustainability by enhancing the durability of concrete elements and supporting a circular economy. We studied delayed ettringite formation (DEF), a potential deterioration mechanism, including mitigation measures, in various heat-cured cementitious systems. The results showed that continuously connected pore/crack paths at the submicroscopic level favor the transportation of DEF-causing ions in heat-cured systems. DEF increases the chance of developing cracks, which is a durability concern. To mitigate DEF, fly ash produced from an Australian bituminous coal-burning power station was incorporated in the binder to support the circular economy concept. Changes in heat-cured cementitious systems were evaluated using expansion, electrical resistivity, dynamic modulus, and microstructural studies. The pozzolanicity of fly ash was found to greatly enhance the formation of denser calcium-silica-hydrate, which in turn restricted the transportation of DEF-causing ions at the submicron level, leading to less DEF occurrence and enhancement of the durability and sustainability of concrete in field structures.

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http://hdl.handle.net/10453/172703