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

dc.contributor.authorAdu-Amankwah, Samuel
dc.contributor.authorKhatib, Jamal M.
dc.contributor.authorSearle, David E.
dc.contributor.authorBlack, Leon
dc.date.accessioned2016-08-22T14:02:36Z
dc.date.available2016-08-22T14:02:36Z
dc.date.issued2016-06-14
dc.identifier.citationBlack, L., Searle, DE., Khatib, JM., Adu-Amankwah, S. (2016) 'Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash', Construction and Building Materials, 121. pp. 453-459 doi: 10.1016/j.conbuildmat.2016.05.132
dc.identifier.issn0950-0618
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.
dc.language.isoen
dc.publisherElsevier
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0950061816308674
dc.subjectGeopolymer
dc.subjectFly ash
dc.subjectLoss on ignition
dc.subjectShrinkage
dc.subjectSetting time
dc.subjectEN 450
dc.titleEffect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash
dc.typeJournal article
dc.identifier.journalConstruction and Building Materials
dc.identifier.volume121
dc.date.accepted2016-05-22
rioxxterms.funderUniversity of Wolverhampton
rioxxterms.identifier.projectUOW220816JK
rioxxterms.versionAM
rioxxterms.licenseref.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
rioxxterms.licenseref.startdate2017-06-14
dc.source.beginpage453
dc.source.endpage459
refterms.dateFCD2018-10-19T09:23:24Z
refterms.versionFCDAM
refterms.dateFOA2017-06-14T00:00:00Z
html.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.


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