Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash
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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
Black, 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.2016.05.132Publisher
ElsevierJournal
Construction and Building MaterialsAdditional Links
http://linkinghub.elsevier.com/retrieve/pii/S0950061816308674Type
Journal articleLanguage
enISSN
0950-0618ae974a485f413a2113503eed53cd6c53
10.1016/j.conbuildmat.2016.05.132
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