Loading...
Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ash
Adu-Amankwah, Samuel Khatib, Jamal M. Searle, David E. Black, Leon
Adu-Amankwah, Samuel
Khatib, Jamal M.
Searle, David E.
Black, Leon
Editors
Other contributors
Affiliation
Epub Date
Issue Date
2016-06-14
Submitted date
Alternative
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.2016.05.132
Publisher
Research Unit
PubMed ID
PubMed Central ID
Embedded videos
Additional Links
Type
Journal article
Language
en
Description
Series/Report no.
ISSN
0950-0618