Indoor CO 2 buffering potential of clay-based building materials
Résumé
Abstract To mitigate the anthropogenic greenhouse gas emissions from the operational energy consumption in buildings, increasingly high-performance envelopes are developed. A reduction in indoor air renewal is observed that leads to a higher pollutant concentration in the built environment. Particular attention was given to CO 2 , an anthropogenic gas that has consequences on the Indoor Air Quality (IAQ) and the health of occupants. Developing a passive regulation system appears to be a promising solution for improving IAQ and reducing the energy consumption of ventilation systems. For that purpose, earth-based materials present interesting characteristics through the presence of clay minerals and their microstructure. In this context, this paper aims at presenting a novel experimental method to assess the CO 2 retention potential of natural earth plasters. The method uses a thermogravimetric device (TGA/DSC) associated with a gas mixer and humid air generator. The mass variation resulting from the interaction of the increasing CO 2 content could thereby be measured and analysed. Results show the important role of reversibility in the phenomenon: the majority of the captured CO 2 being released when the CO 2 concentration drops. It also highlights the role of the relative humidity on the retention capacity. As the retention of CO 2 is lower when the material is wet, the water molecules may occupy part of the adsorption sites and react themselves with the CO 2 . This experiment provides the first values and thus evidence of the CO 2 retention capacity and passive regulation potential of this material.
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Roucan et al. - 2022 - Indoor CO2 buffering potential of clay-based build.pdf (798.95 Ko)
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