Hot Weather Concreting Note

As a general rule, each 10o F increase in ambient temperature reduces slump about 1". A 30o F increase in mix temperature can cut setting time in half, increase water requirements, and reduce the 28-day compressive strength as much as 25%.

A switch from ASTM C494 Type A to Type D water reducing and set retarding mix may be part of an effective plan for hot-weather concreting.

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