Mineral Admixtures in Mortars Effect of Type, Amount and Fineness of Fine Constituents on Compressive Strength

This article reports on the third part of an overall project which was undertaken to develop general mix design rules for concrete containing different kinds of mineral admixtures. The studies investigated the compressive strength of mortars made with up to 75% of crushed quartz, limestone filler or fly ash of different fineness. This article presents all the experimental results from the earlier studies and considers the effects on strength of the nature, amount and fineness of mineral admixtures. Results show that for short hydration times (1 to 2 days), the nature of mineral admixture is not a significant parameter, as mortars containing the same amount of different kinds of admixtures having equivalent fineness present similar strengths. For long hydration times (up to 6 months), the excess strength due to fly ash pozzolanic activity is quantified by the difference between the strengths of mortars containing the same proportions of inert and pozzolanic admixtures with the same fineness. It was confirmed that strength increased with the fineness of mineral admixtures. In the case of inert mineral admixtures, the increase in strength with the fineness of mineral admixtures cannot be explained by the filler effect, but can be attributed to the physical effect of heterogeneous nucleation. The authors conclude with a brief preview of the next part of this work, in which these results will be used for the elaboration of an empirical model leading to the quantification of both physical and chemical effects.

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  • Authors:
    • Lawrence, Philippe
    • Cyr, Martin
    • Ringot, Erick
  • Publication Date: 2005-6


  • English

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  • Accession Number: 01002952
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 2005 9:28AM