Effects of carbon-sequestering coral aggregate on pore structures and compressive strength of concrete

Mi, R; Wang, Y; Yu, T; Li, W

Effects of carbon-sequestering coral aggregate on pore structures and compressive strength of concrete

Mi, R Wang, Y Yu, T Li, W

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Publisher:: Springer Nature
Publication Type:: Journal Article
Citation:: Low-carbon Materials and Green Construction, 1, (1), pp. 21

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Field	Value	Language
dc.contributor.author	Mi, R
dc.contributor.author	Wang, Y
dc.contributor.author	Yu, T
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.date.accessioned	2024-04-11T22:54:02Z
dc.date.available	2024-04-11T22:54:02Z
dc.identifier.citation	Low-carbon Materials and Green Construction, 1, (1), pp. 21
dc.identifier.issn	2731-6319
dc.identifier.issn	2731-6319
dc.identifier.uri	http://hdl.handle.net/10453/177779
dc.description.abstract	<jats:title>Abstract</jats:title><jats:p>CO<jats:sub>2</jats:sub> sequestration/storage shows considerable impacts on the pore structures and compressive strength of concrete. This paper presents a study in which coral aggregates were presoaked in Ca(OH)<jats:sub>2</jats:sub> slurries with different solid-to-liquid ratios (i.e. 0.2, 0.4, and 0.6 g/mL) followed by accelerated carbonation. The effects of CO<jats:sub>2</jats:sub> sequestration on the particle size distribution, cylinder compressive strength, water absorption, and apparent density of coral aggregate were investigated. The evolution of pore structures in coral aggregate concrete after CO<jats:sub>2</jats:sub> sequestration was also studied. Additionally, the effect of CO<jats:sub>2</jats:sub> sequestration on the development of compressive strength of coral aggregate concrete was explored. The results showed that CO<jats:sub>2</jats:sub> sequestration affected the properties of coral aggregate. Moreover, the porosity of CaCO<jats:sub>3</jats:sub> formed by CO<jats:sub>2</jats:sub> sequestration was the highest in the concrete. With the increase of solid-to-liquid ratio, the porosity of cement pastes and the CaCO<jats:sub>3</jats:sub> increased, and more big pores existed in the cement pastes and CaCO<jats:sub>3</jats:sub>. Furthermore, the compressive strength of coral aggregate concrete when the solid-to-liquid ratio was 0.2 g/mL increased compared with that before CO<jats:sub>2</jats:sub> sequestration, but the compressive strength reduced when the ratio increased to 0.6 g/mL.</jats:p>
dc.language	en
dc.publisher	Springer Nature
dc.relation.ispartof	Low-carbon Materials and Green Construction
dc.relation.isbasedon	10.1007/s44242-023-00024-4
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
dc.title	Effects of carbon-sequestering coral aggregate on pore structures and compressive strength of concrete
dc.type	Journal Article
utslib.citation.volume	1
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	*
dc.date.updated	2024-04-11T22:54:01Z
pubs.issue	1
pubs.publication-status	Published online
pubs.volume	1
utslib.citation.issue	1

Abstract:

AbstractCO2 sequestration/storage shows considerable impacts on the pore structures and compressive strength of concrete. This paper presents a study in which coral aggregates were presoaked in Ca(OH)2 slurries with different solid-to-liquid ratios (i.e. 0.2, 0.4, and 0.6 g/mL) followed by accelerated carbonation. The effects of CO2 sequestration on the particle size distribution, cylinder compressive strength, water absorption, and apparent density of coral aggregate were investigated. The evolution of pore structures in coral aggregate concrete after CO2 sequestration was also studied. Additionally, the effect of CO2 sequestration on the development of compressive strength of coral aggregate concrete was explored. The results showed that CO2 sequestration affected the properties of coral aggregate. Moreover, the porosity of CaCO3 formed by CO2 sequestration was the highest in the concrete. With the increase of solid-to-liquid ratio, the porosity of cement pastes and the CaCO3 increased, and more big pores existed in the cement pastes and CaCO3. Furthermore, the compressive strength of coral aggregate concrete when the solid-to-liquid ratio was 0.2 g/mL increased compared with that before CO2 sequestration, but the compressive strength reduced when the ratio increased to 0.6 g/mL.

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