oa Civil Engineer in South Africa - Evaluation of Western Cape clay materials as artificial pozzolans : technical paper

Volume 29, Issue 9
  • ISSN : 0009-7845



Four different clay materials that occur in the Western Cape were selected for evaluation as artificial pozzolans. It was found that the degree of pozzolanic activity that could be developed in these materials depends primarily on the proportion of kaolinite (clay substance) present and that the calcining temperature has relatively little influence. Clay materials from this region with high kaolinite contents and calcined at relatively low temperatures should be excellent pozzolans, with the potential to alleviate the deleterious expansion due to alkali-aggregate reaction in concrete.

Vier verskillende kleimateriale wat in die Wes-Kaap voorkom, is uitgesoek vir evaluasie as kunsmatige possolane. Die ondersoek het getoon dat die graad van possolaniese aktiwiteit wat in hierdie materiale ontwikkel kan word hoofsaaklik afhanklik is van die verhouding van kaoliniet (kleibestanddeel) teenwoordig en dat die temperatuur van kalsinering van minder belang is. Kleimateriale van hierdie gebied met 'n hoë kaolinietinhoud en wat by 'n betreklike lae temperatuur gekalsineer is, sal uitstekende possolane uitmaak, met die potensiaal om die afbrekende uitsetting as gevolg van die alkali-aggregaatreaksie in beton te bekamp.

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