1.Table 1 below is extracted from DIN1045-3, part of the German norms, and prescribes minimum curing times for structural concrete based upon fcm(t=2d)/fcm, the ratio between the average compressive strength values at 2 and 28 days. What are the reasons that make such prescriptions necessary? What are the criteria underlying the particular values specified? Why might these become more critical as the cement industry strives to improve its environmental performance?
Table 1.
