Effects of nano-particles on failure process and microstructural properties of recycled aggregate concrete

Li, W; Long, C; Tam, VWY; Poon, CS; Hui Duan, W

Effects of nano-particles on failure process and microstructural properties of recycled aggregate concrete

Li, W

Long, C Tam, VWY Poon, CS Hui Duan, W

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Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2017, 142 pp. 42 - 50
Issue Date:: 2017-07-01

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Field	Value	Language
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215	en_US
dc.contributor.author	Long, C	en_US
dc.contributor.author	Tam, VWY	en_US
dc.contributor.author	Poon, CS	en_US
dc.contributor.author	Hui Duan, W	en_US
dc.date.issued	2017-07-01	en_US
dc.identifier.citation	Construction and Building Materials, 2017, 142 pp. 42 - 50	en_US
dc.identifier.issn	0950-0618	en_US
dc.identifier.uri	http://hdl.handle.net/10453/124443
dc.description.abstract	© 2017 Elsevier Ltd The effects of nano-particles including nano-silica (NS) and nano-limestone (NL) on the crack propagation and microstructure properties of recycled aggregate concrete (RAC) were experimentally investigated in this study. The crack initiation and propagation of nano-particles modified RAC with different nano-particle modification were evaluated using digital image correlation technique (DIC). The microstructures and porosity of interfacial transition zones (ITZ) in nano-modified RAC were also examined using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). It was found that the micro-cracks were typically derived from relatively weak ITZs in RAC, and then progressively propagated along the compressive loading direction. The meso-crack developments eventually led to final splitting failure. The results indicated that compared to NL, NS was more effective in improving the microstructure properties and enhance the mechanical strength of RAC. The porosity and water absorption of RAC were obviously reduced by the NS incorporation. However, due to particles agglomeration, NL could not effectively improve the microstructure of RAC for further enhancing the RAC mechanical properties. Furthermore, in terms of severe particles agglomeration, NL was even detrimental to the mechanical strength of RAC especially at the late-age.	en_US
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation.ispartof	Construction and Building Materials	en_US
dc.relation.isbasedon	10.1016/j.conbuildmat.2017.03.051	en_US
dc.subject.classification	Building & Construction	en_US
dc.title	Effects of nano-particles on failure process and microstructural properties of recycled aggregate concrete	en_US
dc.type	Journal Article
utslib.citation.volume	142	en_US
utslib.for	0905 Civil Engineering	en_US
utslib.for	1202 Building	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.publication-status	Published	en_US
pubs.volume	142	en_US

Abstract:

© 2017 Elsevier Ltd The effects of nano-particles including nano-silica (NS) and nano-limestone (NL) on the crack propagation and microstructure properties of recycled aggregate concrete (RAC) were experimentally investigated in this study. The crack initiation and propagation of nano-particles modified RAC with different nano-particle modification were evaluated using digital image correlation technique (DIC). The microstructures and porosity of interfacial transition zones (ITZ) in nano-modified RAC were also examined using scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP). It was found that the micro-cracks were typically derived from relatively weak ITZs in RAC, and then progressively propagated along the compressive loading direction. The meso-crack developments eventually led to final splitting failure. The results indicated that compared to NL, NS was more effective in improving the microstructure properties and enhance the mechanical strength of RAC. The porosity and water absorption of RAC were obviously reduced by the NS incorporation. However, due to particles agglomeration, NL could not effectively improve the microstructure of RAC for further enhancing the RAC mechanical properties. Furthermore, in terms of severe particles agglomeration, NL was even detrimental to the mechanical strength of RAC especially at the late-age.

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http://hdl.handle.net/10453/124443