Yildiz Technical University
Yildiz Technical University, Faculty of Civil Engineering, Department of Civil Engineering, Davutpasa Campus, Istanbul, Turkey 34220
This paper describes the effects of variable curing temperatures on compressive strength and sulfate resistance of high-strength, high-performance concrete. Two different concrete mixtures were proportioned to attain the 56-day compressive strength of about 70 MPa upon moist-curing. One mixture contained more quantity of ASTM Class C fly ash than the other mixture. For each mixture, one set of specimens was cured in a standard moist-curing room at 23C and 100% relative humidity, and another set of specimens was sealed in plastic bags and cured in an elevated, variable-temperature curing environment (VTCE). The average temperature of the VTCE cycled between about 30C and 41C once per day. This study revealed that the VTCE-cured concrete did not exhibit significantly different compressive strength or ability to resist sulfates attack than the standard moist-cured specimens. Thus, based on the results of this research, it was concluded that additional effort to stabilize higher curing-temperatures would be necessary for field-cured concrete.