Theoretical model of water vapor absorption-desorption equilibrium of concrete considering the effect of temperature

The water vapor sorption equilibrium relationship of concrete determines the water transport rate in it, which affects the concrete structure's durability. This study applied modeling to predict the water vapor sorption isotherms affected by temperature. Combined with the experimental data, the theoretical model predicted the effect of temperature on water vapor absorption-desorption isotherms and the hysteresis of desorption iso-therms. The results showed that the hysteresis of capillary pores is larger than that of gel pores. An increase in temperature decreases the percentage of water hysteresis in gel pores, and increases the water hysteresis in small capillary pores.

Automated summary

This study used modeling to predict the effects of temperature on water vapor sorption isotherms in concrete. The theoretical model, combined with experimental data, predicted the influence of temperature on the absorption-desorption isotherms and hysteresis. The results showed that the hysteresis in capillary pores is greater than that in gel pores. An increase in temperature decreases the hysteresis percentage in gel pores and increases it in small capillary pores.