Synergistic Effects of Polypropylene and Glass Fiber on Mechanical Properties and Durability of Recycled Aggregate Concrete

Lei, B; Li, W; Liu, H; Tang, Z; Tam, VWY

Synergistic Effects of Polypropylene and Glass Fiber on Mechanical Properties and Durability of Recycled Aggregate Concrete

Lei, B Li, W

Liu, H Tang, Z

Tam, VWY

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Publisher:: SPRINGER
Publication Type:: Journal Article
Citation:: International Journal of Concrete Structures and Materials, 2020, 14, (1)
Issue Date:: 2020-12-01

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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	Liu, H
dc.contributor.author	Tang, Z https://orcid.org/0000-0003-3931-1247
dc.contributor.author	Tam, VWY
dc.date.accessioned	2021-03-08T03:01:46Z
dc.date.available	2021-03-08T03:01:46Z
dc.date.issued	2020-12-01
dc.identifier.citation	International Journal of Concrete Structures and Materials, 2020, 14, (1)
dc.identifier.issn	1976-0485
dc.identifier.issn	2234-1315
dc.identifier.uri	http://hdl.handle.net/10453/146902
dc.description.abstract	© 2020, The Author(s). To better understand the synergistic effects of combined fibers on mechanical properties and durability of recycled aggregate concrete (RAC), different types of fibers with various lengths and mass ratios were adopted in this study. Experimental investigations were conducted to study the 28-day compressive strength and strength loss after exposed to salt-solution freeze–thaw cycles and the coupled action of mechanical loading and salt-solution freeze–thaw cycles. The microstructure was also characterized to evaluate the mechanism of this synergistic effect. To determine the effectiveness of the combined fibers on improving the mechanical properties and durability of RAC, the synergistic coefficient was proposed and applied for various combinations of fibers. The results indicate that the incorporation of fibers slightly decreased the 28-day compressive strength of RAC, but combining different sizes and types of fibers can mitigate this negative effect. Moreover, the incorporation of fibers greatly improves the freeze–thaw resistance of RAC. The combining different fibers exhibited a synergistic effect on the enhancement in properties of RAC, which could not be predicted with only one simplistic rule of fibre mixtures. In addition, microstructural characterization shows that the bonding strength of the interfacial transition zone (ITZ) between the fiber and cement matrix is mainly determined by the chemical bonding force which is due to the hydration reaction between fiber surface and cement matrix.
dc.language	English
dc.publisher	SPRINGER
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation.ispartof	International Journal of Concrete Structures and Materials
dc.relation.isbasedon	10.1186/s40069-020-00411-2
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0905 Civil Engineering, 0912 Materials Engineering, 1202 Building
dc.title	Synergistic Effects of Polypropylene and Glass Fiber on Mechanical Properties and Durability of Recycled Aggregate Concrete
dc.type	Journal Article
utslib.citation.volume	14
utslib.for	0905 Civil Engineering
utslib.for	0912 Materials Engineering
utslib.for	1202 Building
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
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
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2021-03-08T03:01:41Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	14
utslib.citation.issue	1

Abstract:

© 2020, The Author(s). To better understand the synergistic effects of combined fibers on mechanical properties and durability of recycled aggregate concrete (RAC), different types of fibers with various lengths and mass ratios were adopted in this study. Experimental investigations were conducted to study the 28-day compressive strength and strength loss after exposed to salt-solution freeze–thaw cycles and the coupled action of mechanical loading and salt-solution freeze–thaw cycles. The microstructure was also characterized to evaluate the mechanism of this synergistic effect. To determine the effectiveness of the combined fibers on improving the mechanical properties and durability of RAC, the synergistic coefficient was proposed and applied for various combinations of fibers. The results indicate that the incorporation of fibers slightly decreased the 28-day compressive strength of RAC, but combining different sizes and types of fibers can mitigate this negative effect. Moreover, the incorporation of fibers greatly improves the freeze–thaw resistance of RAC. The combining different fibers exhibited a synergistic effect on the enhancement in properties of RAC, which could not be predicted with only one simplistic rule of fibre mixtures. In addition, microstructural characterization shows that the bonding strength of the interfacial transition zone (ITZ) between the fiber and cement matrix is mainly determined by the chemical bonding force which is due to the hydration reaction between fiber surface and cement matrix.

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http://hdl.handle.net/10453/146902