The mechanical, transport and chloride binding characteristics of ultra-high-performance concrete utilising seawater, sea sand and SCMs

Saleh, S; Mahmood, AH; Hamed, E; Zhao, XL

The mechanical, transport and chloride binding characteristics of ultra-high-performance concrete utilising seawater, sea sand and SCMs

Saleh, S Mahmood, AH Hamed, E Zhao, XL

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2023, 372
Issue Date:: 2023-04-03

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Field	Value	Language
dc.contributor.author	Saleh, S
dc.contributor.author	Mahmood, AH
dc.contributor.author	Hamed, E
dc.contributor.author	Zhao, XL
dc.date.accessioned	2024-04-11T06:05:50Z
dc.date.available	2024-04-11T06:05:50Z
dc.date.issued	2023-04-03
dc.identifier.citation	Construction and Building Materials, 2023, 372
dc.identifier.issn	0950-0618
dc.identifier.issn	1879-0526
dc.identifier.uri	http://hdl.handle.net/10453/177745
dc.description.abstract	While concrete production accounts for significant CO2 emissions and natural resources (e.g., river sand and freshwater) depletion, the incorporation of sea sand, seawater, and industrial by-products in ultra-high-performance concrete (UHPC) manufacture could offset such impacts. However, the transport and durability performances of marine resource-based UHPC are not well documented. This paper presents an experimental investigation into the mechanical, transport, and chloride binding characteristics of seawater and sea sand-based ultra-high-performance concrete (SWSS-UHPC) with supplementary cementitious materials (SCM) (i.e., slag and silica fume). Mixes were developed with varying proportions of SCMs (up to 62.5%) and sources of aggregates. Early-age and long-term mechanical (i.e., modulus of elasticity, splitting tensile strength) and transport properties (i.e., water absorption, porosity, and ingress of chloride) were evaluated. Non-destructive tests (i.e., ultrasonic pulse velocity, and electrical resistivity) were correlated to the mechanical and durability properties. The chloride binding capacity was determined. Results reveal that although SCMs in SWSS-UHPC marginally improve its mechanical performance, it offers a significant enhancement in transport properties and durability, particularly at 50% cement replacement. The incorporation of marine resources can be beneficial against chloride diffusion and does not adversely affect the binding of external chloride. Electrical resistivity can successfully predict chloride penetration resistance. SCM-based SWSS-UHPC can be extremely durable for long-term exposure in spray and tidal/splash zones of maritime structures.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2023.130815
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.subject.classification	3302 Building
dc.subject.classification	4005 Civil engineering
dc.subject.classification	4016 Materials engineering
dc.title	The mechanical, transport and chloride binding characteristics of ultra-high-performance concrete utilising seawater, sea sand and SCMs
dc.type	Journal Article
utslib.citation.volume	372
utslib.for	0905 Civil Engineering
utslib.for	1202 Building
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
utslib.copyright.status	closed_access	*
dc.date.updated	2024-04-11T06:05:49Z
pubs.publication-status	Published
pubs.volume	372

Abstract:

While concrete production accounts for significant CO2 emissions and natural resources (e.g., river sand and freshwater) depletion, the incorporation of sea sand, seawater, and industrial by-products in ultra-high-performance concrete (UHPC) manufacture could offset such impacts. However, the transport and durability performances of marine resource-based UHPC are not well documented. This paper presents an experimental investigation into the mechanical, transport, and chloride binding characteristics of seawater and sea sand-based ultra-high-performance concrete (SWSS-UHPC) with supplementary cementitious materials (SCM) (i.e., slag and silica fume). Mixes were developed with varying proportions of SCMs (up to 62.5%) and sources of aggregates. Early-age and long-term mechanical (i.e., modulus of elasticity, splitting tensile strength) and transport properties (i.e., water absorption, porosity, and ingress of chloride) were evaluated. Non-destructive tests (i.e., ultrasonic pulse velocity, and electrical resistivity) were correlated to the mechanical and durability properties. The chloride binding capacity was determined. Results reveal that although SCMs in SWSS-UHPC marginally improve its mechanical performance, it offers a significant enhancement in transport properties and durability, particularly at 50% cement replacement. The incorporation of marine resources can be beneficial against chloride diffusion and does not adversely affect the binding of external chloride. Electrical resistivity can successfully predict chloride penetration resistance. SCM-based SWSS-UHPC can be extremely durable for long-term exposure in spray and tidal/splash zones of maritime structures.

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http://hdl.handle.net/10453/177745