United States Department of Transportation
i
Evaluation of Jobsite Cylinder Curing Practices for the Alabama Concrete Industry
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2023-08-01
[PDF-21.37 MB]
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Abstract:The effect of initial curing temperature and duration on the 28-day compressive strength of concrete was experimentally evaluated. Concrete cylinders were cured at six initial curing temperatures (60, 68, 78, 84, 90, and 100 ⁰F) for three different initial curing durations (24, 48, and 72 hours). After the initial curing duration was complete, the cylinders were moved to final curing in a moist cure room that maintained a temperature of 73.5 ± 3.5 °F until compressive strength testing at 28 days. Eight different concretes were produced at elevated temperatures to simulate summer placement conditions. The results confirm that as the initial curing temperature increases, the 28-day concrete compressive strength decreases. When cured at an initial curing temperature of 100 ⁰F, a maximum reduction of 23% in the 28-day compressive strength occurred. It is critical to maintain initial curing temperatures ranging from 60 to 80 ⁰F because then the change in 28-day strength remains within the acceptable ranges. When the initial curing temperature ranges from 60 to 80 ⁰F, then increasing the initial curing duration from 48 hour to 72 hour does not significantly affect the 28-day concrete compressive strength. The maximum initial curing duration can thus be increased from 48 to 72 hours, which will permit cylinders made on Fridays to be transported to their final curing location on Mondays.
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