Study on high-performance concrete at high temperatures in China (2004-2016) - An updated overview

摘要

High-performance concrete (HPC) has gained a worldwide utilization; however, it may encounter a larger risk of fire exposure which can jeopardize its behavior. Both Chinese and overseas researchers have conducted numerous investigations to reveal the influence of high temperatures on the properties of HPC. As a continuous work, this paper presents the progress in the behavior of HPC exposed to high temperatures in China since 2004. Experimental data are compiled on both thermal and mechanical properties of HPC. They are compared with those from remarkable studies and current code provisions. Introductions and discussions are first made to the thermal properties of HPC, including thermal conductivity, specific heat, and thermal expansion. The paper then summarizes the spalling behavior of HPC under high temperatures. Critical factors are analyzed about their influences on the spalling of HPC. Spalling mechanisms are also presented and discussed. Afterwards, the paper systematically compiles the mechanical properties of HPC under and after elevated temperatures. Finally, some suggestions are put forward with respect to the fire safety of HPC structures.