Abstract
An investigation was conducted to study the effect of curing age on the strength development of high-strength concrete containing silica fume and fly ash and exposed to cold temperatures. Three sets of specimens were tested having initial curing ages of 1, 14, and 28 days at room temperature. The test specimens were exposed to five temperatures ranging from -10 deg C to 20 deg C for time intervals over 3 months in cold ocean water. The gains in compressive and tensile strength with time were directly proportional to the temperature increase. The highest gain in strength with time was documented at 20 deg C and the lowest at -10 deg C for all three sets. The reduction in the rate of strength gain for the set initially cured for 1 day was profound. However, for the set cured initially for 14 days, it was minor and for the set cured initially for 28 days, it was negligible. A maturity analysis using a hyperbolic function was conducted. The maturity functions gave reasonable agreement with the three sets of specimens at different temperatures, except for the specimens cured for 1 day and exposed up to 7 days.
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