oa Civil Engineering = Siviele Ingenieurswese - Evaluation of Western Cape clay materials as artificial pozzolans

Volume 29, Issue 9
  • ISSN : 1021-2000



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.

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