Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash

2.50
Hdl Handle:
http://hdl.handle.net/2436/618625
Title:
Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash
Authors:
Adu-Amankwah, Samuel; Khatib, Jamal M.; Searle, David E.; Black, Leon
Abstract:
The fly ash reported in this paper is coarser than conventional pulverised fuel ash (PFA), with loss on ignition (LOI) exceeding 10.8%. Consequently, it is precluded from being used as a supplementary cementitious material (SCM) according to EN 450 and disposed in landfills. Alkali-activation of such PFAs is considered here. Three concentrations of sodium hydroxide (NaOH) were separately blended with water glass at different ratios to modify the silica modulus. Heat of reaction, setting time, compressive strength and drying shrinkage were investigated as a function of activator composition. Specimens were either cured at room temperature or hydro-thermally treated at 75 °C for five hours. The results show that by optimizing the activator composition, a binder with a 28 day compressive strength of 25 MPa can be synthesised from such PFAs even at room temperature. Among the activator parameters, the alkali content was observed to be most influential.
Citation:
Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash 2016, 121:453 Construction and Building Materials
Publisher:
Elsevier
Journal:
Construction and Building Materials
Issue Date:
Sep-2016
URI:
http://hdl.handle.net/2436/618625
DOI:
10.1016/j.conbuildmat.2016.05.132
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0950061816308674
Type:
Article
Language:
en
ISSN:
0950-0618
Appears in Collections:
Construction and Infrastructure

Full metadata record

DC FieldValue Language
dc.contributor.authorAdu-Amankwah, Samuelen
dc.contributor.authorKhatib, Jamal M.en
dc.contributor.authorSearle, David E.en
dc.contributor.authorBlack, Leonen
dc.date.accessioned2016-08-22T14:02:36Z-
dc.date.available2016-08-22T14:02:36Z-
dc.date.issued2016-09-
dc.identifier.citationEffect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash 2016, 121:453 Construction and Building Materialsen
dc.identifier.issn0950-0618en
dc.identifier.doi10.1016/j.conbuildmat.2016.05.132-
dc.identifier.urihttp://hdl.handle.net/2436/618625-
dc.description.abstractThe fly ash reported in this paper is coarser than conventional pulverised fuel ash (PFA), with loss on ignition (LOI) exceeding 10.8%. Consequently, it is precluded from being used as a supplementary cementitious material (SCM) according to EN 450 and disposed in landfills. Alkali-activation of such PFAs is considered here. Three concentrations of sodium hydroxide (NaOH) were separately blended with water glass at different ratios to modify the silica modulus. Heat of reaction, setting time, compressive strength and drying shrinkage were investigated as a function of activator composition. Specimens were either cured at room temperature or hydro-thermally treated at 75 °C for five hours. The results show that by optimizing the activator composition, a binder with a 28 day compressive strength of 25 MPa can be synthesised from such PFAs even at room temperature. Among the activator parameters, the alkali content was observed to be most influential.en
dc.language.isoenen
dc.publisherElsevieren
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0950061816308674en
dc.rightsArchived with thanks to Construction and Building Materialsen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectGeopolymeren
dc.subjectFly ashen
dc.subjectLoss on ignitionen
dc.subjectShrinkageen
dc.subjectSetting timeen
dc.subjectEN 450en
dc.titleEffect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ashen
dc.typeArticleen
dc.identifier.journalConstruction and Building Materialsen
dc.date.accepted2016-05-22-
rioxxterms.funderInternalen
rioxxterms.identifier.projectUOW220816JKen
rioxxterms.versionAMen
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/en
rioxxterms.licenseref.startdate2017-06-14en
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