Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution

Khan, HA; Castel, A; Khan, MSH

Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution

Khan, HA Castel, A

Khan, MSH

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Publisher:: Elsevier BV
Publication Type:: Journal Article
Citation:: Corrosion Science, 2020, 168, pp. 108586-108586
Issue Date:: 2020-05-15

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Field	Value	Language
dc.contributor.author	Khan, HA
dc.contributor.author	Castel, A https://orcid.org/0000-0003-1619-9643
dc.contributor.author	Khan, MSH
dc.date.accessioned	2020-11-15T19:40:53Z
dc.date.available	2020-11-15T19:40:53Z
dc.date.issued	2020-05-15
dc.identifier.citation	Corrosion Science, 2020, 168, pp. 108586-108586
dc.identifier.issn	0010-938X
dc.identifier.uri	http://hdl.handle.net/10453/144029
dc.description.abstract	© 2020 Elsevier Ltd The objective of this research is to estimate the durability of low-calcium fly ash based geopolymer mortar (FA-GPm) in comparison with sulphate resistant Portland cement mortars (SRPCm) exposed to natural sewer environment. Their performance is also investigated in the sulphuric acid (H2SO4) solution to highlight the difference in the corrosion mechanisms between these two exposure conditions. Mortar samples were removed from natural sewer and 1.5 % sulphuric acid solution after 12, 24 months and 6 months of exposure, respectively. Visual and physical analyses showed greater neutralization and loss in alkalinity in FA-GPm compared to SRPCm. However, mass loss and strength reduction observed for SRPCm was greater compared to FA-GPm. Microstructural analysis showed widespread gypsum crystallization within SRPCm matrix compared to FA-GPm, leading to more severe matrix deterioration. Differences in corrosion mechanism were identified between natural and sulphuric acid exposure conditions which led to the variation in estimated corrosion depth. Data collected from these microstructural and physical investigations were utilized to develop simplified linear models to express the depth of corrosion, surface pH, mass loss and neutralization depth of FA-GPm and SRPCm as a dependent of exposure time, temperature and H2S concentration in natural sewer environments.
dc.language	en
dc.publisher	Elsevier BV
dc.relation.ispartof	Corrosion Science
dc.relation.isbasedon	10.1016/j.corsci.2020.108586
dc.rights	info:eu-repo/semantics/embargoedAccess
dc.subject	0905 Civil Engineering, 0912 Materials Engineering, 0913 Mechanical Engineering
dc.subject.classification	Energy
dc.title	Corrosion investigation of fly ash based geopolymer mortar in natural sewer environment and sulphuric acid solution
dc.type	Journal Article
utslib.citation.volume	168
utslib.for	0905 Civil Engineering
utslib.for	0912 Materials Engineering
utslib.for	0913 Mechanical Engineering
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
utslib.copyright.status	open_access	*
utslib.copyright.embargo	2022-03-07T00:00:00+1000Z
dc.date.updated	2020-11-15T19:40:34Z
pubs.publication-status	Published
pubs.volume	168

Abstract:

© 2020 Elsevier Ltd The objective of this research is to estimate the durability of low-calcium fly ash based geopolymer mortar (FA-GPm) in comparison with sulphate resistant Portland cement mortars (SRPCm) exposed to natural sewer environment. Their performance is also investigated in the sulphuric acid (H2SO4) solution to highlight the difference in the corrosion mechanisms between these two exposure conditions. Mortar samples were removed from natural sewer and 1.5 % sulphuric acid solution after 12, 24 months and 6 months of exposure, respectively. Visual and physical analyses showed greater neutralization and loss in alkalinity in FA-GPm compared to SRPCm. However, mass loss and strength reduction observed for SRPCm was greater compared to FA-GPm. Microstructural analysis showed widespread gypsum crystallization within SRPCm matrix compared to FA-GPm, leading to more severe matrix deterioration. Differences in corrosion mechanism were identified between natural and sulphuric acid exposure conditions which led to the variation in estimated corrosion depth. Data collected from these microstructural and physical investigations were utilized to develop simplified linear models to express the depth of corrosion, surface pH, mass loss and neutralization depth of FA-GPm and SRPCm as a dependent of exposure time, temperature and H2S concentration in natural sewer environments.

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http://hdl.handle.net/10453/144029