Durability Loss in Concrete Due to ASR-DEF, The Role of Aggregate Reactivity in Deleterious Delayed Ettringite Formation

Martin, L; Thomas, P; De Silva, P; Sirivivatnanon, V

Durability Loss in Concrete Due to ASR-DEF, The Role of Aggregate Reactivity in Deleterious Delayed Ettringite Formation

Martin, L

Thomas, P De Silva, P Sirivivatnanon, V

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Publication Type:: Conference Proceeding
Citation:: Concrete 2023 Resilient and Sustainable Concrete: Breaking Down Barriers, 2023
Issue Date:: 2023-09-10

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Field	Value	Language
dc.contributor.author	Martin, L https://orcid.org/0009-0004-1887-4424
dc.contributor.author	Thomas, P
dc.contributor.author	De Silva, P
dc.contributor.author	Sirivivatnanon, V
dc.date	2023-09-10
dc.date.accessioned	2023-10-03T06:09:23Z
dc.date.available	2023-05-26
dc.date.available	2023-10-03T06:09:23Z
dc.date.issued	2023-09-10
dc.identifier.citation	Concrete 2023 Resilient and Sustainable Concrete: Breaking Down Barriers, 2023
dc.identifier.uri	http://hdl.handle.net/10453/172443
dc.description.abstract	Durability of concrete and cementitious materials is important to their worldwide usage in housing and infrastructure. Two known causes of durability loss in concrete are the alkali-silica reaction (ASR) and delayed ettringite formation (DEF), which are chemical processes with the potential for expansion, cracking, and strength loss in affected elements. There is significant overlap in the contributing factors for ASR and DEF, in particular pore solution alkalinity. DEF is of most concern for large, precast concrete structures, although in Australia reported cases of deleterious DEF have been in conjunction with mild or moderate ASR. Current guidelines regarding DEF are based on laboratory experiments in mortar specimens, and the role of the aggregate and ASR in concrete has been overlooked. Mitigation strategies for DEF involve temperature thresholds during curing, chemical limits for the binder, and the use of supplementary cementitious materials (SCMs) in the mix design. This study investigates the role of aggregate reactivity, curing temperature, and cement composition in the susceptibility of concrete elements to deleterious DEF, and the efficacy of fly-ash as an SCM in preventing deleterious ASR-DEF. Concrete specimens containing ASR-reactive aggregates were made with different binder and curing conditions, then monitored for expansion and strength loss over two years. Contributions towards the understanding of ASR-DEF mechanisms and the development of industry risk assessments in Australia are presented in this paper.
dc.language	en
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Concrete 2023 Resilient and Sustainable Concrete: Breaking Down Barriers
dc.relation.ispartof	Concrete Institute of Australia Biennial National Conference
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Durability Loss in Concrete Due to ASR-DEF, The Role of Aggregate Reactivity in Deleterious Delayed Ettringite Formation
dc.type	Conference Proceeding
utslib.location.activity	Perth
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2023-10-03T06:09:22Z
pubs.finish-date	2023-09-13
pubs.publication-status	Published online
pubs.start-date	2023-09-10

Abstract:

Durability of concrete and cementitious materials is important to their worldwide usage in housing and infrastructure. Two known causes of durability loss in concrete are the alkali-silica reaction (ASR) and delayed ettringite formation (DEF), which are chemical processes with the potential for expansion, cracking, and strength loss in affected elements. There is significant overlap in the contributing factors for ASR and DEF, in particular pore solution alkalinity. DEF is of most concern for large, precast concrete structures, although in Australia reported cases of deleterious DEF have been in conjunction with mild or moderate ASR. Current guidelines regarding DEF are based on laboratory experiments in mortar specimens, and the role of the aggregate and ASR in concrete has been overlooked. Mitigation strategies for DEF involve temperature thresholds during curing, chemical limits for the binder, and the use of supplementary cementitious materials (SCMs) in the mix design. This study investigates the role of aggregate reactivity, curing temperature, and cement composition in the susceptibility of concrete elements to deleterious DEF, and the efficacy of fly-ash as an SCM in preventing deleterious ASR-DEF. Concrete specimens containing ASR-reactive aggregates were made with different binder and curing conditions, then monitored for expansion and strength loss over two years. Contributions towards the understanding of ASR-DEF mechanisms and the development of industry risk assessments in Australia are presented in this paper.

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http://hdl.handle.net/10453/172443