Performance Enhancement of Permeable Asphalt Mixtures With Recycled Aggregate for Concrete Pavement Application

Lei, B; Li, W; Luo, Z; Tam, VWY; Dong, W; Wang, K

Performance Enhancement of Permeable Asphalt Mixtures With Recycled Aggregate for Concrete Pavement Application

Lei, B Li, W

Luo, Z Tam, VWY Dong, W Wang, K

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Publisher:: FRONTIERS MEDIA SA
Publication Type:: Journal Article
Citation:: Frontiers in Materials, 2020, 7
Issue Date:: 2020-09-16

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Field	Value	Language
dc.contributor.author	Lei, B
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Luo, Z
dc.contributor.author	Tam, VWY
dc.contributor.author	Dong, W
dc.contributor.author	Wang, K
dc.date.accessioned	2021-03-26T01:42:12Z
dc.date.available	2021-03-26T01:42:12Z
dc.date.issued	2020-09-16
dc.identifier.citation	Frontiers in Materials, 2020, 7
dc.identifier.issn	2296-8016
dc.identifier.issn	2296-8016
dc.identifier.uri	http://hdl.handle.net/10453/147541
dc.description.abstract	© Copyright © 2020 Lei, Li, Luo, Tam, Dong and Wang. The incorporation of recycled concrete aggregate (RCA) in permeable asphalt mixtures (PAMs) is an efficient method of utilizing construction demolished waste. It not only conforms to the trend of building sponge cities, but also alleviates the problem of overexploitation of natural aggregate resources. As the performance of PAM containing recycled aggregate is not comparable to natural aggregate, modification treatments and the addition of hybrid fibers are adopted as two enhancement methods to improve the performance of PAM with RAC in this study. It is found that replacing natural aggregate with recycled aggregate increases the optimum asphalt content (OAC) but decreases the residual stability. The OAC is increased by 45% when the RCA ratio is 100%, whereas applying silicone resin can give a 16.2% decrease in the OAC. Enhancing RCA with silicone resin can increase the water stability to be comparable with natural aggregate. Moreover, with modification treatment using calcium hydroxide solution, the mechanical strength of PAM is enhanced to even higher than that of natural coarse aggregate mixture alone. Improvements in both mechanical strength and water stability are also achieved by strengthening recycled aggregate with cement slurry, although the performance is less effective than using silicone resin. With the increase in the content of RCA, the permeability coefficients of PAM first decrease and then exhibit an increasing trend. The results indicate that the PAM with RCA and modification treatments can perform satisfactorily as a pavement material in practice. Applying probable modification, PAM incorporating RCA meets the criteria for use in concrete pavement applications.
dc.language	English
dc.publisher	FRONTIERS MEDIA SA
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation	http://purl.org/au-research/grants/arc/IH150100006
dc.relation.ispartof	Frontiers in Materials
dc.relation.isbasedon	10.3389/fmats.2020.00253
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0912 Materials Engineering, 1007 Nanotechnology
dc.title	Performance Enhancement of Permeable Asphalt Mixtures With Recycled Aggregate for Concrete Pavement Application
dc.type	Journal Article
utslib.citation.volume	7
utslib.for	0912 Materials Engineering
utslib.for	1007 Nanotechnology
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	open_access	*
dc.date.updated	2021-03-26T01:42:10Z
pubs.publication-status	Published
pubs.volume	7

Abstract:

© Copyright © 2020 Lei, Li, Luo, Tam, Dong and Wang. The incorporation of recycled concrete aggregate (RCA) in permeable asphalt mixtures (PAMs) is an efficient method of utilizing construction demolished waste. It not only conforms to the trend of building sponge cities, but also alleviates the problem of overexploitation of natural aggregate resources. As the performance of PAM containing recycled aggregate is not comparable to natural aggregate, modification treatments and the addition of hybrid fibers are adopted as two enhancement methods to improve the performance of PAM with RAC in this study. It is found that replacing natural aggregate with recycled aggregate increases the optimum asphalt content (OAC) but decreases the residual stability. The OAC is increased by 45% when the RCA ratio is 100%, whereas applying silicone resin can give a 16.2% decrease in the OAC. Enhancing RCA with silicone resin can increase the water stability to be comparable with natural aggregate. Moreover, with modification treatment using calcium hydroxide solution, the mechanical strength of PAM is enhanced to even higher than that of natural coarse aggregate mixture alone. Improvements in both mechanical strength and water stability are also achieved by strengthening recycled aggregate with cement slurry, although the performance is less effective than using silicone resin. With the increase in the content of RCA, the permeability coefficients of PAM first decrease and then exhibit an increasing trend. The results indicate that the PAM with RCA and modification treatments can perform satisfactorily as a pavement material in practice. Applying probable modification, PAM incorporating RCA meets the criteria for use in concrete pavement applications.

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http://hdl.handle.net/10453/147541