Abstract
The correction values of concrete strength in term of the anticipated mean outdoor air temperature or mean curing temperature of concrete using low-heat cement, such as portland fly-ash cement, moderate-heat cement portland cement are investigated based on the results of experiment. The relation between maturity ana development of concrete strength in various temperature condition i.e., constant temperature, job site temperature following temperature in structure could be represented by a polygon consisted with three line and the age for proportioning strength of concrete could be established within 91 days, because the second polygon line and the third polygon lone intersect at about 3000D゜D. The standard value of correction value of concrete strength when the age for proportioning strength of concrete is m days, and the age for quality control of the strength of concrete in structure is n days are presented as table-2.
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