The Effects of Atmospheric and Construction Conditions on Curing Concrete Equivalent Ages
G S. Wojcik
Concrete maturity, often indicated by its equivalent age, is determined by the interaction of the temperature-dependent exothermic hydration reactions and the atmospheric conditions and curing regimen experienced during early ages. While indices of concrete maturity have gained wide acceptance in determining proper opening times of structures and in investigations of structural failures, there is a need for a study showing how the maturity may change depending on the environmental conditions experienced. In this paper, the SLABS model is used to predict the equivalent ages of New York State Department of Transportation's Class HP concrete bridge decks for a wide variety of atmospheric and construction conditions. After 24 h of hydration, the equivalent ages are shown to vary from 10 h to more than 60 h depending on conditions when averaged over the deck thickness. They can also vary by more than 20 h through the slab thickness.