Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates.

Ying, J; Han, Z; Shen, L; Li, W

Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates.

Ying, J Han, Z Shen, L Li, W

Permalink

Publisher:: MDPI
Publication Type:: Journal Article
Citation:: Materials (Basel, Switzerland), 2020, 13, (20), pp. 1-19
Issue Date:: 2020-10-16

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download Published versionAdobe PDF (6.49 MB)

View on publisher's site

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Ying, J
dc.contributor.author	Han, Z
dc.contributor.author	Shen, L
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.date.accessioned	2021-02-17T20:47:11Z
dc.date.available	2020-10-14
dc.date.available	2021-02-17T20:47:11Z
dc.date.issued	2020-10-16
dc.identifier.citation	Materials (Basel, Switzerland), 2020, 13, (20), pp. 1-19
dc.identifier.issn	1996-1944
dc.identifier.issn	1996-1944
dc.identifier.uri	http://hdl.handle.net/10453/146183
dc.description.abstract	Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (<i>W/</i><i>C</i><sub>parent</sub>) of 0.4, 0.5 and 0.6, respectively, and were strengthened by carbonation and nano-silica slurry wrapping methods. It was found that when <i>W/</i><i>C</i><sub>paren</sub> was 0.3, 0.4 and 0.5, respectively, compared with the mortar in the untreated RCA, the capillary porosity of the mortar in the carbonated RCA decreased by 19%, 16% and 30%, respectively; the compressive strength of concrete containing the carbonated RCA increased by 13%, 11% and 13%, respectively; the chloride diffusion coefficient of RAC (<i>D</i><sub>RAC</sub>) containing the nano-SiO<sub>2</sub> slurry-treated RCA decreased by 17%, 16% and 11%; and that of RAC containing the carbonated RCA decreased by 21%, 25% and 26%, respectively. Regardless of being strengthened or not, both <i>D</i><sub>RAC</sub> and porosity of old mortar in RCAs increased with increasing <i>W/</i><i>C</i><sub>parent</sub>. For different types of RCAs, <i>D</i><sub>RAC</sub> increased obviously with increasing water absorption of RCA. Finally, a theoretical model of <i>D</i><sub>RAC</sub> considering the water absorption of RCA was established and verified by experiments, which can be used to predict the <i>D</i><sub>RAC</sub> under the influence of different factors, especially the water absorption of RCA.
dc.format	Electronic
dc.language	eng
dc.publisher	MDPI
dc.relation.ispartof	Materials (Basel, Switzerland)
dc.relation.isbasedon	10.3390/ma13204631
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	03 Chemical Sciences, 09 Engineering
dc.title	Influence of Parent Concrete Properties on Compressive Strength and Chloride Diffusion Coefficient of Concrete with Strengthened Recycled Aggregates.
dc.type	Journal Article
utslib.citation.volume	13
utslib.location.activity	Switzerland
utslib.for	0905 Civil Engineering
utslib.for	03 Chemical Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
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
utslib.copyright.status	open_access	*
dc.date.updated	2021-02-17T20:46:56Z
pubs.issue	20
pubs.publication-status	Published
pubs.volume	13
utslib.citation.issue	20

Abstract:

Parent concrete coming from a wide range of sources can result in considerable differences in the properties of recycled coarse aggregate (RCA). In this study, the RCAs were obtained by crushing the parent concrete with water-to-cement ratios (W/C_parent) of 0.4, 0.5 and 0.6, respectively, and were strengthened by carbonation and nano-silica slurry wrapping methods. It was found that when W/C_paren was 0.3, 0.4 and 0.5, respectively, compared with the mortar in the untreated RCA, the capillary porosity of the mortar in the carbonated RCA decreased by 19%, 16% and 30%, respectively; the compressive strength of concrete containing the carbonated RCA increased by 13%, 11% and 13%, respectively; the chloride diffusion coefficient of RAC (D_RAC) containing the nano-SiO₂ slurry-treated RCA decreased by 17%, 16% and 11%; and that of RAC containing the carbonated RCA decreased by 21%, 25% and 26%, respectively. Regardless of being strengthened or not, both D_RAC and porosity of old mortar in RCAs increased with increasing W/C_parent. For different types of RCAs, D_RAC increased obviously with increasing water absorption of RCA. Finally, a theoretical model of D_RAC considering the water absorption of RCA was established and verified by experiments, which can be used to predict the D_RAC under the influence of different factors, especially the water absorption of RCA.

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

http://hdl.handle.net/10453/146183