| Abstrakt: |
Earthen building materials, with their hygroscopic properties conferred by clay minerals, interact with the indoor environment, regulating factors such as relative humidity. While their moisture buffering capacity is well documented, there is limited data on their potential for CO 2 buffering. Whilst previous research has investigated the CO 2 retention mechanism in dry air conditions, this study focuses on the effect of relative humidity (RH) and temperature on the CO 2 retention process. Experimental comparisons were carried out at 0%, 51% and 71% RH with a CO 2 concentration of 20,000 ppm at a temperature of 25 ∘ C and 35 ∘ C using a TG-DSC instrument. The results show that the presence of water reduces CO 2 retention and slows down the kinetics of mass uptake. However, CO 2 is still retained in the presence of water, indicating the availability of adsorption sites and potential CO 2 –water interactions. Furthermore, the study shows that the effect of temperature is less pronounced at 51% than at 0% RH, and higher CO 2 retention is observed at 71% than at 51% RH, indicating the possibility of CO 2 dissolution in water. This paper presents the first analysis of the complex interactions between CO 2 earth and water, elucidating their dependence on relative humidity and ambient temperature conditions. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink