Technical and environmental performance of eggshell lime for soil stabilization

Saldanha, RB; da Rocha, CG; Caicedo, AML; Consoli, NC

Technical and environmental performance of eggshell lime for soil stabilization

Saldanha, RB da Rocha, CG Caicedo, AML Consoli, NC

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Publisher:: Elsevier
Publication Type:: Journal Article
Citation:: Construction and Building Materials, 2021, 298, pp. 1-12
Issue Date:: 2021-09-06

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Field	Value	Language
dc.contributor.author	Saldanha, RB
dc.contributor.author	da Rocha, CG
dc.contributor.author	Caicedo, AML
dc.contributor.author	Consoli, NC
dc.date.accessioned	2022-05-19T05:40:56Z
dc.date.available	2022-05-19T05:40:56Z
dc.date.issued	2021-09-06
dc.identifier.citation	Construction and Building Materials, 2021, 298, pp. 1-12
dc.identifier.issn	0950-0618
dc.identifier.issn	0950-0618
dc.identifier.uri	http://hdl.handle.net/10453/157529
dc.description.abstract	Searching for alternative materials to reduce the extraction of natural resources is key to a more sustainable world and relevant to construction and infrastructure projects in which large amounts of materials are used. Eggshell is a solid waste that is rich in calcium carbonate and can potentially replace limestone for lime production. This research examines the environmental impacts of eggshell limes and commercially available limes using Life Cycle Assessment (LCA). In addition, a physical–chemical and mineralogical characterization of eggshell limes and an assessment of the strength and stiffness of a sandy soil stabilized with ground glass and such limes are carried out. Results show that eggshell limes have reduced impacts for aquatic ecotoxicity, terrestrial ecotoxicity and land occupation when compared to traditional limes as two processes (Quarrying of limestone and Limestone improvement) are eliminated. A reduction of 65.1% in damage to Ecosystem quality was observed for eggshell quicklime (versus quicklime from limestone) and of 50% for eggshell hydrated lime (versus hydrated lime from limestone). Eggshell limes were found to have adequate physical–chemical-mineralogical characteristics for soil stabilization applications, being composed by 97.0% calcium oxide and 2.0% magnesium oxide (quicklime) and by 89.6% calcium hydroxide, 2.9% magnesium hydroxide and 5% calcium carbonate (hydrated lime). Lastly, both limes improved the strength and stiffness of the studied soil by reacting with ground glass (pozzolan).
dc.language	English
dc.publisher	Elsevier
dc.relation.ispartof	Construction and Building Materials
dc.relation.isbasedon	10.1016/j.conbuildmat.2021.123648
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 1202 Building
dc.subject.classification	Building & Construction
dc.title	Technical and environmental performance of eggshell lime for soil stabilization
dc.type	Journal Article
utslib.citation.volume	298
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	*
pubs.consider-herdc	false
dc.date.updated	2022-05-19T05:40:54Z
pubs.publication-status	Published
pubs.volume	298

Abstract:

Searching for alternative materials to reduce the extraction of natural resources is key to a more sustainable world and relevant to construction and infrastructure projects in which large amounts of materials are used. Eggshell is a solid waste that is rich in calcium carbonate and can potentially replace limestone for lime production. This research examines the environmental impacts of eggshell limes and commercially available limes using Life Cycle Assessment (LCA). In addition, a physical–chemical and mineralogical characterization of eggshell limes and an assessment of the strength and stiffness of a sandy soil stabilized with ground glass and such limes are carried out. Results show that eggshell limes have reduced impacts for aquatic ecotoxicity, terrestrial ecotoxicity and land occupation when compared to traditional limes as two processes (Quarrying of limestone and Limestone improvement) are eliminated. A reduction of 65.1% in damage to Ecosystem quality was observed for eggshell quicklime (versus quicklime from limestone) and of 50% for eggshell hydrated lime (versus hydrated lime from limestone). Eggshell limes were found to have adequate physical–chemical-mineralogical characteristics for soil stabilization applications, being composed by 97.0% calcium oxide and 2.0% magnesium oxide (quicklime) and by 89.6% calcium hydroxide, 2.9% magnesium hydroxide and 5% calcium carbonate (hydrated lime). Lastly, both limes improved the strength and stiffness of the studied soil by reacting with ground glass (pozzolan).

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http://hdl.handle.net/10453/157529