Effect of crystalline admixtures on shrinkage and alkali-silica reaction of biochar-cementitious composites

Lin, X; Castel, A; Deng, Z; Dong, B; Zhang, X; Zhang, S; Li, W

Effect of crystalline admixtures on shrinkage and alkali-silica reaction of biochar-cementitious composites

Lin, X Castel, A

Deng, Z Dong, B Zhang, X Zhang, S Li, W

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Developments in the Built Environment, 2024, 18
Issue Date:: 2024-04-01

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Field	Value	Language
dc.contributor.author	Lin, X
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.contributor.author	Deng, Z
dc.contributor.author	Dong, B
dc.contributor.author	Zhang, X
dc.contributor.author	Zhang, S
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.date.accessioned	2025-03-16T23:14:26Z
dc.date.available	2025-03-16T23:14:26Z
dc.date.issued	2024-04-01
dc.identifier.citation	Developments in the Built Environment, 2024, 18
dc.identifier.issn	2666-1659
dc.identifier.issn	2666-1659
dc.identifier.uri	http://hdl.handle.net/10453/185839
dc.description.abstract	This study investigated effects of crystalline admixture (CA) on shrinkage and alkali-silica reaction behaviours of biochar-cementitious composites. Addition of 1–1.5 wt% superabsorbent polymer (SAP) completely mitigated autogenous shrinkage while slightly increasing the 120-day total shrinkage of the SP-cement composite by 5.7%, resulting in the highest apparent porosity. 1–1.5 wt% CA addition did not affect autogenous shrinkage while slightly reducing the 120-day total shrinkage by 10.1%. The combination of CA and waste wood biochar (WWB) reduced autogenous shrinkage by 24.23% and 120-day total shrinkage by 23.6%, resulting in the lowest apparent porosity. The formation of hydration products in the WWB pores and on WWB surface densified the cementitious matrix, leading to a reduction in water evaporation. Furthermore, for specimens exposed to 1 M NaOH solution at 80 °C, CA addition significantly reduced the 120-day expansion by 50.6%, while the combination of CA and WWB addition reduced the 120-day expansion by 42.9%.
dc.language	English
dc.publisher	ELSEVIER
dc.relation	http://purl.org/au-research/grants/arc/DP220101051
dc.relation	http://purl.org/au-research/grants/arc/DP220100036
dc.relation.ispartof	Developments in the Built Environment
dc.relation.isbasedon	10.1016/j.dibe.2024.100456
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	3302 Building
dc.subject.classification	4005 Civil engineering
dc.title	Effect of crystalline admixtures on shrinkage and alkali-silica reaction of biochar-cementitious composites
dc.type	Journal Article
utslib.citation.volume	18
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/UTS Groups
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Built Infrastructure Resilience (CBIR)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Green Technology (CGT)
pubs.organisational-group	University of Technology Sydney/UTS Groups/Centre for Green Technology (CGT)/Centre for Green Technology (CGT) Associate Members
utslib.copyright.status	open_access	*
dc.rights.license	This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). To view a copy of this license, visit https://creativecommons.org/licenses/by-nc/4.0/
dc.date.updated	2025-03-16T23:14:24Z
pubs.publication-status	Published
pubs.volume	18

Abstract:

This study investigated effects of crystalline admixture (CA) on shrinkage and alkali-silica reaction behaviours of biochar-cementitious composites. Addition of 1–1.5 wt% superabsorbent polymer (SAP) completely mitigated autogenous shrinkage while slightly increasing the 120-day total shrinkage of the SP-cement composite by 5.7%, resulting in the highest apparent porosity. 1–1.5 wt% CA addition did not affect autogenous shrinkage while slightly reducing the 120-day total shrinkage by 10.1%. The combination of CA and waste wood biochar (WWB) reduced autogenous shrinkage by 24.23% and 120-day total shrinkage by 23.6%, resulting in the lowest apparent porosity. The formation of hydration products in the WWB pores and on WWB surface densified the cementitious matrix, leading to a reduction in water evaporation. Furthermore, for specimens exposed to 1 M NaOH solution at 80 °C, CA addition significantly reduced the 120-day expansion by 50.6%, while the combination of CA and WWB addition reduced the 120-day expansion by 42.9%.

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http://hdl.handle.net/10453/185839