Abstract
An experimental study with regard to maturity and compressive strength development of concrete was carried out by using mortar and concrete specimens. Eight kinds of normal portland cement and two from Hokkaido district were used for motar and concrete respectively. On the basis of statistical calculation of this experimental data, the following observations and conclusions seem to be appropriate ; 1) The relation between logarithmic value of maturity and compressive strength development of martar and concrete expressed in cubic regression equation shows a good correlation. 2) Since the practical curves for compressive strength development below 210°D・D shown in JASS 5 were intended to give lower limit, the obtained curves based on this test results are higher in the range below 210°D・D, and the curves in the range above 210°D・D show lower value of concrete strength. 3) The standard additional temperature for calulation of maturity shows a little discrepancy by kinds of cement and water cement ratios, however it seems to be practically appropriate to take 10℃ hitherto as the standard additional temperature.
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