Recycling of raw water treatment sludge in cementitious composites: effects on heat evolution, compressive strength and microstructure

Gomes, SDC; Zhou, JL; Li, W; Qu, F

Recycling of raw water treatment sludge in cementitious composites: effects on heat evolution, compressive strength and microstructure

Gomes, SDC Zhou, JL Li, W

Qu, F

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Resources, Conservation and Recycling, 2020, 161
Issue Date:: 2020-10-01

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Field	Value	Language
dc.contributor.author	Gomes, SDC
dc.contributor.author	Zhou, JL
dc.contributor.author	Li, W https://orcid.org/0000-0002-4651-1215
dc.contributor.author	Qu, F
dc.date.accessioned	2021-04-09T04:17:29Z
dc.date.available	2021-04-09T04:17:29Z
dc.date.issued	2020-10-01
dc.identifier.citation	Resources, Conservation and Recycling, 2020, 161
dc.identifier.issn	0921-3449
dc.identifier.issn	1879-0658
dc.identifier.uri	http://hdl.handle.net/10453/147947
dc.description.abstract	Water treatment sludge (WTS) is produced daily and represents a globally significant solid waste stream. The application of this sludge as construction materials has been studied although most studies have modified the sludge before its incorporation, hence involving significant energy consumption. This study aims to use raw sludge as a novel cementitious material, by determining the effects of sludge addition on the composition and performance of cementitious composites. Important aspects such as the physicochemical interaction of the raw sludge with the Portland cement, the heat evolution of the cement paste and the compressive strength of the composite cement were carefully studied. The results show that for 1-2% of WTS addition, the compressive strength and heat evolution of the cement paste was well maintained being close to the reference specimen after 28 days of curing. However, for sludge addition above 5%, a delay in the hydration reaction was observed, together with about 25% reduction in compressive strength at 28 days of curing. The mineralogical and thermal analysis showed decreasing portlandite content and increasing calcite in the WTS-amended composites. Scanning electron microscope analysis demonstrated that the addition of sludge induced more porous and weak surface structures compared to the reference specimen.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Resources, Conservation and Recycling
dc.relation.isbasedon	10.1016/j.resconrec.2020.104970
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	05 Environmental Sciences, 09 Engineering, 12 Built Environment and Design
dc.subject.classification	Environmental Sciences
dc.title	Recycling of raw water treatment sludge in cementitious composites: effects on heat evolution, compressive strength and microstructure
dc.type	Journal Article
utslib.citation.volume	161
utslib.for	05 Environmental Sciences
utslib.for	09 Engineering
utslib.for	12 Built Environment and Design
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
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-04-09T04:17:25Z
pubs.publication-status	Published
pubs.volume	161

Abstract:

Water treatment sludge (WTS) is produced daily and represents a globally significant solid waste stream. The application of this sludge as construction materials has been studied although most studies have modified the sludge before its incorporation, hence involving significant energy consumption. This study aims to use raw sludge as a novel cementitious material, by determining the effects of sludge addition on the composition and performance of cementitious composites. Important aspects such as the physicochemical interaction of the raw sludge with the Portland cement, the heat evolution of the cement paste and the compressive strength of the composite cement were carefully studied. The results show that for 1-2% of WTS addition, the compressive strength and heat evolution of the cement paste was well maintained being close to the reference specimen after 28 days of curing. However, for sludge addition above 5%, a delay in the hydration reaction was observed, together with about 25% reduction in compressive strength at 28 days of curing. The mineralogical and thermal analysis showed decreasing portlandite content and increasing calcite in the WTS-amended composites. Scanning electron microscope analysis demonstrated that the addition of sludge induced more porous and weak surface structures compared to the reference specimen.

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http://hdl.handle.net/10453/147947