Alkali activation of PFA: effect on strength development

M.R. Jones, L.J. Csetenyi, E. Csetenyi, R.K. Dhir

    Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution


    The compressive strength development of mortars with 30%, 50% and 100% by mass replacement of Portland cement by pulverised fuel ash, activated by alkalis was studied. The considered activators were based on NaOH, Ca(OH) 2, and waterglass (2:1 SiO 2:Na 2O) in various concentrations. Two different temperature curing regimes, i.e. 20°C and 60°C water storage after moulding at 24 hours, were tested. 40mm cube strength was measured at 1, 3, 7, 28, and 91 days. The results show lower strength development rates than PC control and indeed literature references report paste strength development cured at temperatures typically between 65 and 85°C. The results underline the difficulty of alkali activating PFA at practical temperatures that could be used in precast concrete production.

    Original languageEnglish
    Title of host publicationRole of cement science in sustainable development
    Subtitle of host publicationproceedings of the International Symposium dedicated to Professor Fred Glasser, University of Aberdeen, Scotland held on 3-4 September 2003 at the University of Dundee, Scotland, UK
    EditorsRavindra K. Dhir, Moray D. Newlands, Laszlo J. Csetenyi
    Place of PublicationLondon
    PublisherThomas Telford
    Number of pages6
    ISBN (Print)0727732463, 9780727732477
    Publication statusPublished - 1 Jan 2003
    EventInternational Symposium Dedicated to Professor Fred Glasser, University of Aberdeen, Scotland - Dundee, United Kingdom
    Duration: 3 Sep 20034 Sep 2003


    ConferenceInternational Symposium Dedicated to Professor Fred Glasser, University of Aberdeen, Scotland
    Country/TerritoryUnited Kingdom
    OtherSeries of three international symposia to promote the contributions that concrete ... under the umbrella title of Celebrating Concrete, People and Practice"


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