This paper deals with the prediction of Young modulus of concrete obtained with partial substitution of ordinary portland cement with metakaolin. A multiple time scale approach is then applied on two models based on micromechanics with the aim to homogenise the obtained Young modulus. The homogenisation schemes involved here are the self-consistency and Mori-Tanka ones. According to the Mori-Tanaka scheme, various shapes of inclusion are considered in the model, and the products of the pozzolanic reaction are taken into account at the appropriate scale. In order to justify the robustness of our analytical findings, the predicted results is compared to experimental observations on ordinary concrete with metakaolin as partial substitute of CEM I, cement. Moreover, we found experimentally that there is an optimal rate of substitution above which further substitution has an adverse effect. As results, the model involving the self-consistency scheme predicts values closed to that found experimentally, while for the scheme of Mori-Tanaka, the values predicted are closed to that found experimentally if both the shape of all the inclusions phases are considered spherical, or the void inclusion phases are considered ellipsoidal.
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