Predictions of concrete strength are made using the so-called strength–maturity curves. The method, composed by a testing apparatus and a model, is conceived to be inexpensive and auto-calibrating, adapted to be used on the field. A second objective of this research is to detect when the mix changes and thus the prediction of the strength is not accurate. In this paper research is presented whose objective is to provide an accurate method to predict the strength of commercial concretes at any time. Finally, results obtained with the proposed method were compared with those obtained using standard methods, showing a good agreement. In addition, the quality of predictions of strength–maturity curves can be constantly improved as the specimens’ population increases. Results confirmed that the proposed method is fast, inexpensive, self-calibrating, accurate and can detect any variation of the concrete mix proportions or components quality. This paper proposes an innovative method to derive the strength-Et and total heat-Et curves for both normal strength and UHPC. At the present time, the preparation of the strength-Et curves requires time-consuming and labor-intensive testing prior to the beginning of construction operations. A timely knowledge of concrete strength is useful, for instance, to precisely determine when the shores of a hardening structural element can be safely removed. A timely knowledge of concrete and ultra-high-performance concrete (UHPC) strength is possible through the so-called strength-equivalent time (Et) curves.
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