Moisture Migration in Concrete under High Temperature: A Review

Stelzner et al. (2019) conducted a study on moisture migration characteristics in concrete under high temperature using CT scanning. Their findings revealed that moisture migration in concrete at 800 ℃ occurred at a very slow pace. Although the moisture content in the low-temperature region increased at high temperature, the rate of increase was also slow. Li (2005) reported that liquid water mobility in concrete could be disregarded based on their test results, suggesting that liquid water movement in concrete is negligible in a short period. Only when the concrete cracks, liquid water can migrate quickly through the cracks. Therefore, the depth of concrete cracking can be determined by observing water and vapor overflowing from the cracks on the unexposed surface of the concrete under fire.