Monitoring pozzolanic activity by direct activation with calcium hydroxide

W. J. McCarter, D. Tran

    Research output: Contribution to journalArticlepeer-review

    67 Citations (Scopus)


    In this paper the change in conductivity of pozzolan/CH mixtures, at ambient temperatures, is monitored for periods extending over two days. Such a method allows the chemical activity within the mixture to be followed and it is shown that a number of features/parameters can be identified which are related to the pozzolanic reactivity of the material. In particular, a pozzolanicity index is developed and is based on data obtained from conductivity measurements. The index reflects both the rate of pozzolanic reaction and time to setting. Work is presented on a range of cement replacement materials.

    Original languageEnglish
    Pages (from-to)179-184
    Number of pages6
    JournalConstruction and Building Materials
    Issue number3
    Publication statusPublished - 18 Apr 1996


    • Calcium hydroxide
    • Conductivity
    • Pozzolanicity


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