Abstract
Relation between the maturity and compressive strength development of concrete was aproximated by appling logistic curve and suggested new estimating method of concrete strength. The new estimating method has some advantages compared with the method described in present JASS 5 as following, 1) By using Early Temperature Correction C, a tendency to show a lower value of concrete strength as low temperature curing at the same maturity in early days is corrected. 2) The logistic curve shows all of the strength development process, so it is of wide application. 3) Regardless of age, it is possible to estimate not only a value of the middle but also of the lower and higher limits of concrete strength. 4) It is possible to derive concrete strength at any age from the strength at standard age (210°D・D and 840°D・D). 5) Because logistic curve is a statistical curve, it is useful when using computer.
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