A computer model is presented that predicts the thermal response of carbonate and siliceous aggregate (normal weight) concrete slab specimens subjected to pre. Validation of the model is based on data that were collected during comprehensive pre test programs conducted by the Portland Cement Association(1) in the 1960s. The model's ability to replicate the experimental results with good agreement substantiates it as a valuable analytical tool for research and design applications related to concrete fire behavior: With appropriate input data pertaining to the thermal properties of various aggregate concretes as functions of temperature, the thermal response and/or fire resistance of concrete walls and slabs of any aggregate type and thickness can be predicted. As the emergence of performance-based design criteria gains momentum, established and accepted computer models will be crucial in evaluating the impact of performance-based fire codes and standards on concrete building design. Further testing of material properties of concrete at elevated temperatures-such as thermal conductivity, thermal diffusivity, and mass loss (water)-is needed if the maximum potential of this computer technology is to be realized.
