Study on mass loss of concrete subjected to elevated temperature

Deformation behavior of concrete structures exposed to fire heating is influenced by amount of water release of the cement hydrate. In this study, elevated temperature tests for measuring the mass loss of concrete cylinders are carried out and water release property of the cement hydrate in the concrete up to 800 °C is discussed. The evaporation occurs remarkably above 100 °C. The rate of evaporation increases proportionally to the water content between 100 °C and 200 °C. The release of gel water from C-S-H continues up to 500 °C. The rate of dehydration increases proportionally to the gel water mass between 250 °C and 500 °C. The release of water from cement hydrate hardly occurs between 600 °C and 800 °C under heating condition at 1.5 °C / min. © 2020 Japan Association for Fire Science and Engineering. All rights reserved.