Influence of aggregate type and moisture on heat transfer of concrete columns subjected to elevated temperatures

Of many various parameters affecting heat transfer, this study aims to investigate the aggregate type and moisture content. Different characteristics of aggregates in terms of thermal conductivity and specific heat capacity play the utmost role in diffusing heat. To this end, in this study, the effect of calcareous, siliceous and lightweight aggregates are investigated based on the proposed equations from common codes of practice, namely, ASCE and Eurocode. Furthermore, both dry and wet concrete are taken into account. Numerical analyses are carried out on a concrete column chosen from the literature and the hydro-thermal procedure is validated with experimental models. Results indicate better efficacy of calcareous aggregates with respect to other types of aggregates and the significant role of high moisture contents in temperature reduction.

Keywords:

Fire , Elevated Temperatures , Concrete column , Aggregate , Moisture content