Interfacial transition zones in recycled aggregate concrete with different mixing approaches

Li, W; Xiao, J; Sun, Z; Kawashima, S; Shah, SP

Interfacial transition zones in recycled aggregate concrete with different mixing approaches

Li, W

Xiao, J Sun, Z Kawashima, S Shah, SP

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Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2012, 35 pp. 1045 - 1055
Issue Date:: 2012-10-01

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Field	Value	Language
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215	en_US
dc.contributor.author	Xiao, J	en_US
dc.contributor.author	Sun, Z	en_US
dc.contributor.author	Kawashima, S	en_US
dc.contributor.author	Shah, SP	en_US
dc.date.issued	2012-10-01	en_US
dc.identifier.citation	Construction and Building Materials, 2012, 35 pp. 1045 - 1055	en_US
dc.identifier.issn	0950-0618	en_US
dc.identifier.uri	http://hdl.handle.net/10453/115490
dc.description.abstract	Interfacial Transition Zone (ITZ) is an important phase that influences the mechanical properties of Recycled Aggregate Concrete (RAC). This paper is devoted to an investigation of the effect of different mixing approaches on the properties of ITZs in RAC. Nanoindentation and Scanning Electron Microscopy (SEM) were implemented to characterize nanomechanical properties and microstructures of the old and new ITZs. The results indicate that the indentation modulus of ITZs have different distribution trends when using different mixing approaches. It reveals that the Two-Stage Mixing Approach (TSMA) can improve the nanomechanical properties of the new ITZ by reducing the volume fraction of voids and Calcium Hydroxide (CH). The SEM observation also indicates that an obviously denser and more homogeneous microstructure was achieved in the new ITZ prepared by TSMA compared to a Normal Mixing Approach (NMA). Correlating the nanoindentation and SEM results with the compressive strength, it can be concluded that TSMA has a beneficial influence on the mechanical properties of RAC by improving the properties of the new ITZ. © 2012 Elsevier Ltd. All rights reserved.	en_US
dc.relation.ispartof	Construction and Building Materials	en_US
dc.relation.isbasedon	10.1016/j.conbuildmat.2012.06.022	en_US
dc.subject.classification	Building & Construction	en_US
dc.title	Interfacial transition zones in recycled aggregate concrete with different mixing approaches	en_US
dc.type	Journal Article
utslib.citation.volume	35	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	35	en_US

Abstract:

Interfacial Transition Zone (ITZ) is an important phase that influences the mechanical properties of Recycled Aggregate Concrete (RAC). This paper is devoted to an investigation of the effect of different mixing approaches on the properties of ITZs in RAC. Nanoindentation and Scanning Electron Microscopy (SEM) were implemented to characterize nanomechanical properties and microstructures of the old and new ITZs. The results indicate that the indentation modulus of ITZs have different distribution trends when using different mixing approaches. It reveals that the Two-Stage Mixing Approach (TSMA) can improve the nanomechanical properties of the new ITZ by reducing the volume fraction of voids and Calcium Hydroxide (CH). The SEM observation also indicates that an obviously denser and more homogeneous microstructure was achieved in the new ITZ prepared by TSMA compared to a Normal Mixing Approach (NMA). Correlating the nanoindentation and SEM results with the compressive strength, it can be concluded that TSMA has a beneficial influence on the mechanical properties of RAC by improving the properties of the new ITZ. © 2012 Elsevier Ltd. All rights reserved.

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http://hdl.handle.net/10453/115490