Numerical Prediction Model for Temperature Development in Mass Concrete Structures

Abstract

A spreadsheet program based on a two-dimensional (2-D) finite difference method was employed to analyze the thermal behavior of two bridge pier caps, and analysis results were compared with recorded concrete temperatures from the field. Tests were performed in the laboratory to determine the rate of heat generation of the identical concrete mixtures used in the construction. The activation energy of each mix design was determined following the ASTM C1074 procedure to implement the equivalent age concept to the temperature predictions. Results showed that concrete temperature time histories at the center and the side surface of the bridge pier caps could be predicted reasonably well by using the 2-D finite difference model. This spreadsheet can be a useful tool to help engineers make critical decisions, such as formwork removal time, insulation practices, and precooling and postcooling methods, and minimize the risk of early-age thermal cracking in mass concrete structures.