Moisture Migration in Concrete Under Fire: A Critical Review of Experimental Findings

Stelzner et al. (2019) investigated the behavior of moisture migration in concrete under high temperature using CT scanning. Their findings indicated that the speed of moisture migration in concrete was negligible at 800 ℃. Although the moisture content in the low-temperature region increased at high temperatures, the rate of increase was relatively slow. Li (2005) reported that the mobility of liquid water in concrete could be disregarded based on their experimental results. It was concluded that liquid water could not move in concrete within a short time frame, except during the occurrence of cracks. The presence of cracks in concrete facilitated the rapid migration of liquid water through them. Therefore, the depth of cracking in concrete can be determined by observing water and vapor overflowing from cracks on the unexposed surface of the concrete during a fire event.