Effects of environmental actions, recycled aggregate quality and modification treatments on durability performance of recycled concrete

Lei, B; Li, W; Tang, Z; Li, Z; Tam, VWY

Effects of environmental actions, recycled aggregate quality and modification treatments on durability performance of recycled concrete

Lei, B Li, W

Tang, Z

Li, Z Tam, VWY

Permalink

Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Journal of Materials Research and Technology, 2020, 9, (6), pp. 13375-13389
Issue Date:: 2020-11-01

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download full textAdobe PDF (4.68 MB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Lei, B
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Tang, Z https://orcid.org/0000-0003-3931-1247
dc.contributor.author	Li, Z
dc.contributor.author	Tam, VWY
dc.date.accessioned	2021-03-11T00:33:54Z
dc.date.available	2021-03-11T00:33:54Z
dc.date.issued	2020-11-01
dc.identifier.citation	Journal of Materials Research and Technology, 2020, 9, (6), pp. 13375-13389
dc.identifier.issn	2238-7854
dc.identifier.issn	2238-7854
dc.identifier.uri	http://hdl.handle.net/10453/147015
dc.description.abstract	© 2020 The Author(s). The durability performance of recycled concrete (RC) subjected to different environmental actions, including salt-solution, mechanical load, salt-solution freeze-thaw cycles, and coupled mechanical load and salt-solution freeze-thaw cycles was investigated in this paper. To evaluate the effects of recycled aggregate (RA) quality on the RC durability, modeled recycled concrete (MRC) containing modeled recycled aggregate (MRA) with various thickness and coverage of old mortar, along with different degrees of initial damage, was fabricated and tested. Moreover, several modification treatments were employed to study the effects of modification treatments on the RC durability, which included the impregnation of RA with polyvinyl alcohol (PVA) emulsion or nano-SiO2 solutions, and the enhancement of RC with the incorporations of fly ash or hybrid fly ash and silica fume. The results reveal that the deterioration of RC under coupled actions of mechanical load and salt-solution freeze-thaw cycles was the most severe, which was followed by the salt-solution freeze-thaw cycles, mechanical load and salt-solution. The old interface in RA was determined as the weakest zone in RC. With the increase in the thickness or coverage of old mortar, or the initial damage of RA, the durability performance of RC declined, and the effect of initial damage of RA was more significant compared to the thickness or coverage of old mortar. Additionally, modifying RC with 1.5% nano-SiO2 solution or PVA emulsion, and replacing cement with 10% fly ash can significantly enhance the RC durability.
dc.language	en
dc.publisher	Elsevier BV
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Journal of Materials Research and Technology
dc.relation.isbasedon	10.1016/j.jmrt.2020.09.073
dc.rights	Elsevier required licence: © 2020 . This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The definitive publisher version is available online at https://doi.org/10.1016/j.jmrt.2020.09.073	en_US
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Effects of environmental actions, recycled aggregate quality and modification treatments on durability performance of recycled concrete
dc.type	Journal Article
utslib.citation.volume	9
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	2021-03-11T00:33:50Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	9
utslib.citation.issue	6

Abstract:

© 2020 The Author(s). The durability performance of recycled concrete (RC) subjected to different environmental actions, including salt-solution, mechanical load, salt-solution freeze-thaw cycles, and coupled mechanical load and salt-solution freeze-thaw cycles was investigated in this paper. To evaluate the effects of recycled aggregate (RA) quality on the RC durability, modeled recycled concrete (MRC) containing modeled recycled aggregate (MRA) with various thickness and coverage of old mortar, along with different degrees of initial damage, was fabricated and tested. Moreover, several modification treatments were employed to study the effects of modification treatments on the RC durability, which included the impregnation of RA with polyvinyl alcohol (PVA) emulsion or nano-SiO2 solutions, and the enhancement of RC with the incorporations of fly ash or hybrid fly ash and silica fume. The results reveal that the deterioration of RC under coupled actions of mechanical load and salt-solution freeze-thaw cycles was the most severe, which was followed by the salt-solution freeze-thaw cycles, mechanical load and salt-solution. The old interface in RA was determined as the weakest zone in RC. With the increase in the thickness or coverage of old mortar, or the initial damage of RA, the durability performance of RC declined, and the effect of initial damage of RA was more significant compared to the thickness or coverage of old mortar. Additionally, modifying RC with 1.5% nano-SiO2 solution or PVA emulsion, and replacing cement with 10% fly ash can significantly enhance the RC durability.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/147015