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Various empirical equations have previously been suggested for estimating the modulus of elasticity of concrete from its compressive strength. In addition, a considerable number of practical and universal equations have been proposed for predicting the modulus of elasticity when the product includes coarse aggregates and various types of mineral additions. However, such equations are not applicable to the whole data for recycled aggregate concrete because its mechanical properties depend greatly on both the type of aggregates recycled and the ratio of the mix proportions within such concrete. In this study, more than 1300 experimental data obtained from studies performed between 1980 and 2012 in Japan and Korea were used to statistically analyse the relationship between compressive strength and modulus of elasticity. The compressive strength of recycled aggregate concrete was found to range between 18 and 65 MPa, and therefore a prediction equation is proposed for recycled aggregate concrete that considers the ratio and types of recycled coarse aggregates used.

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