Numerical prediction of ²²²Rn exhalation from cement–based materials under accelerated carbonation

A model combined with carbonization and radon migration is proposed to simulate radon exhaled from concrete under standard accelerated carbonization. Considering the diffusion and reaction consumption of CO₂ as well as the diffusion and decay of radon in porous media, the surface radon exhalation rate of the test block is obtained, and the radon diffusion coefficient was modified. The functional relationship between the correction factor and the carbonation depth and carbonation age period under standard accelerated carbonation conditions was established. The revised simulated value was in good agreement with the experimental value.