Mechanical strengths and microstructures of recycled aggregate concrete incorporating nanoparticles

Li, W; Luo, Z; Long, C; Huang, Z; Huang, L; Yu, Q; Sun, Z

Mechanical strengths and microstructures of recycled aggregate concrete incorporating nanoparticles

Li, W

Luo, Z Long, C Huang, Z Huang, L Yu, Q Sun, Z

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Publication Type:: Journal Article
Citation:: Advances in Civil Engineering Materials, 2018, 7 (1), pp. 188 - 205
Issue Date:: 2018-01-01

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Field	Value	Language
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215	en_US
dc.contributor.author	Luo, Z	en_US
dc.contributor.author	Long, C	en_US
dc.contributor.author	Huang, Z	en_US
dc.contributor.author	Huang, L	en_US
dc.contributor.author	Yu, Q	en_US
dc.contributor.author	Sun, Z	en_US
dc.date.issued	2018-01-01	en_US
dc.identifier.citation	Advances in Civil Engineering Materials, 2018, 7 (1), pp. 188 - 205	en_US
dc.identifier.issn	2379-1357	en_US
dc.identifier.uri	http://hdl.handle.net/10453/132156
dc.description.abstract	Copyright © 2018 by ASTM International The influences of nanoparticles on the mechanical properties and microstructures of recycled aggregate concrete (RAC) were investigated in this study. The compressive and flexural strengths of RAC with different dosages of nanoSiO2 (NS) and nanoCaCO3 (NC) were tested. Both the scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) techniques were applied to analyze the microstructures and porosity of interfacial transition zones (ITZs) in RAC. Based on the comparison on compressive strength and flexural strength, the NS is more effective than the NC for improving the mechanical properties of RAC. Dispersion of NC particles by a superplasticizer can somewhat improve the early-age strength of RAC but is unlikely to enhance the 28-day mechanical strengths. This may be attributed to the better dispersion and pozzolanic activity of NS compared to NC. The results show that a denser microstructure and a reduction of porosity within ITZs were observed by incorporating NS, which occurred along with the improvement of the mechanical strengths of RAC. Moreover, the NS-modified RAC exhibits less total porosity than the NC-modified RAC. The NS-modified RAC mainly contains small size pores, but the NC-modified RAC has more large pores than the NS-modified RAC, which has negative effects on the mechanical properties of RAC.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Advances in Civil Engineering Materials	en_US
dc.relation.isbasedon	10.1520/ACEM20160078	en_US
dc.title	Mechanical strengths and microstructures of recycled aggregate concrete incorporating nanoparticles	en_US
dc.type	Journal Article
utslib.citation.volume	1	en_US
utslib.citation.volume	7	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	0912 Materials Engineering	en_US
utslib.for	1007 Nanotechnology	en_US
pubs.embargo.period	Not known	en_US
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
pubs.issue	1	en_US
pubs.publication-status	Published	en_US
pubs.volume	7	en_US

Abstract:

Copyright © 2018 by ASTM International The influences of nanoparticles on the mechanical properties and microstructures of recycled aggregate concrete (RAC) were investigated in this study. The compressive and flexural strengths of RAC with different dosages of nanoSiO2 (NS) and nanoCaCO3 (NC) were tested. Both the scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) techniques were applied to analyze the microstructures and porosity of interfacial transition zones (ITZs) in RAC. Based on the comparison on compressive strength and flexural strength, the NS is more effective than the NC for improving the mechanical properties of RAC. Dispersion of NC particles by a superplasticizer can somewhat improve the early-age strength of RAC but is unlikely to enhance the 28-day mechanical strengths. This may be attributed to the better dispersion and pozzolanic activity of NS compared to NC. The results show that a denser microstructure and a reduction of porosity within ITZs were observed by incorporating NS, which occurred along with the improvement of the mechanical strengths of RAC. Moreover, the NS-modified RAC exhibits less total porosity than the NC-modified RAC. The NS-modified RAC mainly contains small size pores, but the NC-modified RAC has more large pores than the NS-modified RAC, which has negative effects on the mechanical properties of RAC.

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http://hdl.handle.net/10453/132156