Investigation on Failure Mechanism of Nanomodified Recycled Aggregate Concrete

Li, W; Long, C; Luo, Z; Huang, Z

Investigation on Failure Mechanism of Nanomodified Recycled Aggregate Concrete

Li, W

Long, C Luo, Z Huang, Z

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Publication Type:: Journal Article
Citation:: Jianzhu Cailiao Xuebao/Journal of Building Materials, 2017, 20 (5)
Issue Date:: 2017-10-01

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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	Luo, Z	en_US
dc.contributor.author	Huang, Z	en_US
dc.date.issued	2017-10-01	en_US
dc.identifier.citation	Jianzhu Cailiao Xuebao/Journal of Building Materials, 2017, 20 (5)	en_US
dc.identifier.issn	1007-9629	en_US
dc.identifier.uri	http://hdl.handle.net/10453/126063
dc.description.abstract	© 2017, Editorial Department of Journal of Building Materials. All right reserved. The crack evolution of recycled aggregate concrete (RAC) and the performance of RAC after incorporation of different amount of nanoparticles (nanosilica sol and nanolimestone) were studied. Under uniaxial compression, the crack development of RAC specimens with different water-cement ratios (0.4, 0.5 and 0.6) and aggregate replacement ratios were observed by high speed camera. Scanning electron microscopy (SEM) observation and mercury injection test were conducted for studying the microscopic morphology and pore structure of the interfacial transition zone (ITZ) of nanomodified RAC and the influences of different mass fraction of nanoparticles and different treatment processes on it were analyzed. The results indicate that the crack of RAC is usually derived from new ITZ or old ITZ (determined by the weaker one) and then it gradually extends to the surrounding area. The evolution of crack eventually leads to the longitudinal splitting failure of the RAC. Nanosilica sol could improve the microstructure of ITZ. Therefore, the strength of nanosilica sol modified RAC was enhanced. But the improvement by nanolimestone is not very significant for it can't enter the interface transition zone to fill the pore in it.	en_US
dc.relation.ispartof	Jianzhu Cailiao Xuebao/Journal of Building Materials	en_US
dc.relation.isbasedon	10.3969/j.issn.1007-9629.2017.05.005	en_US
dc.subject.classification	Building & Construction	en_US
dc.title	Investigation on Failure Mechanism of Nanomodified Recycled Aggregate Concrete	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	20	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	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	20	en_US

Abstract:

© 2017, Editorial Department of Journal of Building Materials. All right reserved. The crack evolution of recycled aggregate concrete (RAC) and the performance of RAC after incorporation of different amount of nanoparticles (nanosilica sol and nanolimestone) were studied. Under uniaxial compression, the crack development of RAC specimens with different water-cement ratios (0.4, 0.5 and 0.6) and aggregate replacement ratios were observed by high speed camera. Scanning electron microscopy (SEM) observation and mercury injection test were conducted for studying the microscopic morphology and pore structure of the interfacial transition zone (ITZ) of nanomodified RAC and the influences of different mass fraction of nanoparticles and different treatment processes on it were analyzed. The results indicate that the crack of RAC is usually derived from new ITZ or old ITZ (determined by the weaker one) and then it gradually extends to the surrounding area. The evolution of crack eventually leads to the longitudinal splitting failure of the RAC. Nanosilica sol could improve the microstructure of ITZ. Therefore, the strength of nanosilica sol modified RAC was enhanced. But the improvement by nanolimestone is not very significant for it can't enter the interface transition zone to fill the pore in it.

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http://hdl.handle.net/10453/126063