Investigation on dynamic mechanical properties of fly ash/slag-based geopolymeric recycled aggregate concrete

Tang, Z; Li, W; Tam, VWY; Luo, Z

Investigation on dynamic mechanical properties of fly ash/slag-based geopolymeric recycled aggregate concrete

Tang, Z

Li, W

Tam, VWY Luo, Z

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Composites Part B: Engineering, 2020, 185
Issue Date:: 2020-03-15

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Field	Value	Language
dc.contributor.author	Tang, Z https://orcid.org/0000-0003-3931-1247
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Tam, VWY
dc.contributor.author	Luo, Z
dc.date.accessioned	2022-05-04T12:37:43Z
dc.date.available	2022-05-04T12:37:43Z
dc.date.issued	2020-03-15
dc.identifier.citation	Composites Part B: Engineering, 2020, 185
dc.identifier.issn	1359-8368
dc.identifier.issn	1879-1069
dc.identifier.uri	http://hdl.handle.net/10453/157009
dc.description.abstract	By harnessing the benefits from both construction and demolition waste recycling and geopolymer binders, geopolymeric recycled aggregate concrete (GRAC) can contribute to the green and eco-friendly construction material products. In this study, the compressive behavior of GRAC based on fly ash and slag was experimentally investigated under both quasi-static and dynamic loadings. Quasi-static compressive tests were performed by using a high-force servo-hydraulic test system, while dynamic compressive tests were carried out by using a Ø80-mm split Hopkinson pressure bar (SHPB) apparatus. The compressive properties of GRAC under dynamic loading, including stress-strain curves, energy absorption capability, and failure modes were obtained and compared with those under quasi-static loading. The results show that the compressive properties of GRAC exhibit a strong strain rate dependency. Although the recycled aggregate replacement decreases the quasi-static compressive strength, it exhibits a slight effect on the compressive strength at high strain rates. The dynamic increase factor (DIF) for compressive strength exhibits an significant increasing trend with the recycled aggregate replacement. On the other hand, the incorporation of slag increases the quasi-static compressive strength, dynamic compressive strength, and DIF. As for the energy absorption capacity, a minor enhancement is achieved with the recycled aggregate replacement, while a significant improvement is identified after the inclusion of slag. Empirical DIF formulae for compressive strength of GRAC are proposed, in which the DIF increases approximately linearly with the strain rate in a logarithmic manner.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation	http://purl.org/au-research/grants/arc/DE150101751
dc.relation.ispartof	Composites Part B: Engineering
dc.relation.isbasedon	10.1016/j.compositesb.2020.107776
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	09 Engineering
dc.subject.classification	Materials
dc.title	Investigation on dynamic mechanical properties of fly ash/slag-based geopolymeric recycled aggregate concrete
dc.type	Journal Article
utslib.citation.volume	185
utslib.for	0905 Civil Engineering
utslib.for	0912 Materials Engineering
utslib.for	09 Engineering
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	*
dc.date.updated	2022-05-04T12:37:40Z
pubs.publication-status	Published
pubs.volume	185

Abstract:

By harnessing the benefits from both construction and demolition waste recycling and geopolymer binders, geopolymeric recycled aggregate concrete (GRAC) can contribute to the green and eco-friendly construction material products. In this study, the compressive behavior of GRAC based on fly ash and slag was experimentally investigated under both quasi-static and dynamic loadings. Quasi-static compressive tests were performed by using a high-force servo-hydraulic test system, while dynamic compressive tests were carried out by using a Ø80-mm split Hopkinson pressure bar (SHPB) apparatus. The compressive properties of GRAC under dynamic loading, including stress-strain curves, energy absorption capability, and failure modes were obtained and compared with those under quasi-static loading. The results show that the compressive properties of GRAC exhibit a strong strain rate dependency. Although the recycled aggregate replacement decreases the quasi-static compressive strength, it exhibits a slight effect on the compressive strength at high strain rates. The dynamic increase factor (DIF) for compressive strength exhibits an significant increasing trend with the recycled aggregate replacement. On the other hand, the incorporation of slag increases the quasi-static compressive strength, dynamic compressive strength, and DIF. As for the energy absorption capacity, a minor enhancement is achieved with the recycled aggregate replacement, while a significant improvement is identified after the inclusion of slag. Empirical DIF formulae for compressive strength of GRAC are proposed, in which the DIF increases approximately linearly with the strain rate in a logarithmic manner.

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http://hdl.handle.net/10453/157009