Performance deterioration of fly ash/slag-based geopolymer composites subjected to coupled cyclic preloading and sulfuric acid attack

Qu, F; Li, W; Wang, K; Zhang, S; Sheng, D

Performance deterioration of fly ash/slag-based geopolymer composites subjected to coupled cyclic preloading and sulfuric acid attack

Qu, F Li, W

Wang, K Zhang, S Sheng, D

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Journal of Cleaner Production, 2021, 321
Issue Date:: 2021-10-25

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Field	Value	Language
dc.contributor.author	Qu, F
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Wang, K
dc.contributor.author	Zhang, S
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2022-05-04T01:56:59Z
dc.date.available	2022-05-04T01:56:59Z
dc.date.issued	2021-10-25
dc.identifier.citation	Journal of Cleaner Production, 2021, 321
dc.identifier.issn	0959-6526
dc.identifier.issn	1879-1786
dc.identifier.uri	http://hdl.handle.net/10453/156987
dc.description.abstract	Coupled effects of cyclic preloading and sulfuric acid attacks on the performance deterioration of fly ash/ground granulated blast furnace slag (GGBFS) geopolymer mortar (GPM) were investigated in this study. Ordinary Portland cement mortar (OPM) was also prepared as the control for comparison. The testing parameters include visual appearance, mass change, compressive strength, degradation depth, microstructure and leaching behavior after exposure to sulfuric acid solutions. Before the exposure to sulfuric acid solutions, compressive strength of GPM was increased with the addition of GGBFS, but more strength reduction was caused by cyclic preloading compared to the OPM. On the other hand, after the exposure to different sulfuric acid attacks, GPM with higher content of GGBFS experienced server deterioration after preloading. Cyclic preloading probably caused microcracks or damages in mortars, thus increasing the probability of sulfuric acid deterioration. Although GPM exhibited more strength reduction due to preloading than the OPM, after 18-month exposure to sulfuric acid attacks, GPM with preloading still performed better than the corresponding OPM. Similarly, the corresponding GPM exhibited a lower mass loss and degradation depth compared to the OPM under the same conditions. This implies that the higher content of CaO in GGBFS and OPC increase the formations of ettringite and gypsum, which lead to more expansion and severer cracks and damages. Compared with the calcium silicate hydrate (C-S-H) gels in OPM, there are higher Al/Si ratios but lower Ca/Si ratios of cross-linked aluminosilicate polymer gels in GPM. Therefore, GPM exhibited less severe deterioration even with exposure to sulfuric acid attacks though.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH200100010
dc.relation	http://purl.org/au-research/grants/arc/LE210100019
dc.relation.ispartof	Journal of Cleaner Production
dc.relation.isbasedon	10.1016/j.jclepro.2021.128942
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0907 Environmental Engineering, 0910 Manufacturing Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Environmental Sciences
dc.title	Performance deterioration of fly ash/slag-based geopolymer composites subjected to coupled cyclic preloading and sulfuric acid attack
dc.type	Journal Article
utslib.citation.volume	321
utslib.for	0907 Environmental Engineering
utslib.for	0910 Manufacturing Engineering
utslib.for	0915 Interdisciplinary 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	closed_access	*
dc.date.updated	2022-05-04T01:56:55Z
pubs.publication-status	Published
pubs.volume	321

Abstract:

Coupled effects of cyclic preloading and sulfuric acid attacks on the performance deterioration of fly ash/ground granulated blast furnace slag (GGBFS) geopolymer mortar (GPM) were investigated in this study. Ordinary Portland cement mortar (OPM) was also prepared as the control for comparison. The testing parameters include visual appearance, mass change, compressive strength, degradation depth, microstructure and leaching behavior after exposure to sulfuric acid solutions. Before the exposure to sulfuric acid solutions, compressive strength of GPM was increased with the addition of GGBFS, but more strength reduction was caused by cyclic preloading compared to the OPM. On the other hand, after the exposure to different sulfuric acid attacks, GPM with higher content of GGBFS experienced server deterioration after preloading. Cyclic preloading probably caused microcracks or damages in mortars, thus increasing the probability of sulfuric acid deterioration. Although GPM exhibited more strength reduction due to preloading than the OPM, after 18-month exposure to sulfuric acid attacks, GPM with preloading still performed better than the corresponding OPM. Similarly, the corresponding GPM exhibited a lower mass loss and degradation depth compared to the OPM under the same conditions. This implies that the higher content of CaO in GGBFS and OPC increase the formations of ettringite and gypsum, which lead to more expansion and severer cracks and damages. Compared with the calcium silicate hydrate (C-S-H) gels in OPM, there are higher Al/Si ratios but lower Ca/Si ratios of cross-linked aluminosilicate polymer gels in GPM. Therefore, GPM exhibited less severe deterioration even with exposure to sulfuric acid attacks though.

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http://hdl.handle.net/10453/156987