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Moisture buffering capacity of earth mortar plasters and hemp concrete. Effect of temperature and thickness
Earth mortar plasters and hemp concrete are hygroscopic materials since they have the ability to uptake and release water vapour. These materials can be used for a passive control of relative humidity (RH) inside buildings, with the benefits of improving the health and comfort of the occupants, as well as reducing the energy consumption of buildings. The quantification of this passive control potential for buildings material has been extensively studied by the scientific community since the last decade. These studies notably lead to the Nordtest project (Rode et al. 2005) where the concept of Moisture Buffering Value (MBV) was developed, as well as a test protocol in order to quantify this characteristic of the material. The main objective of this dissertation is to study the impact of temperature and thickness of a coating material on its passive regulation potential of indoor air RH. For that purpose, two types of hygroscopic coatings materials are studied: earth mortar plasters and hemp concretes. The influence of the thickness is analysed through dynamic MBV test (“Moisture Buffering Value“ test) at 23°C on three formulations of each material (earth and hemp concrete) at three different thicknesses. The influence of temperature is performed only for hemp concrete formulations on static (sorption curves) and dynamic (MBV tests) tests at 23°C and 40°C. The analysis of the results, made using the support of theoretical models, allows underlining that the thickness involved in the daily passive control of RH remains most of the time limited (only the first centimetre of the earth plasters and 5cm for hemp concretes). However, some surface irregularities may have a strong impact on this active thickness. The other main result of this dissertation is the strong impact of temperature on both static and dynamic hygroscopic characteristics of the material. Indeed, the increase of temperature at a constant RH tends to significantly reduce the water content of the material. But, on the other side, due to higher vapour ...
Moisture buffering capacity of earth mortar plasters and hemp concrete. Effect of temperature and thickness
Earth mortar plasters and hemp concrete are hygroscopic materials since they have the ability to uptake and release water vapour. These materials can be used for a passive control of relative humidity (RH) inside buildings, with the benefits of improving the health and comfort of the occupants, as well as reducing the energy consumption of buildings. The quantification of this passive control potential for buildings material has been extensively studied by the scientific community since the last decade. These studies notably lead to the Nordtest project (Rode et al. 2005) where the concept of Moisture Buffering Value (MBV) was developed, as well as a test protocol in order to quantify this characteristic of the material. The main objective of this dissertation is to study the impact of temperature and thickness of a coating material on its passive regulation potential of indoor air RH. For that purpose, two types of hygroscopic coatings materials are studied: earth mortar plasters and hemp concretes. The influence of the thickness is analysed through dynamic MBV test (“Moisture Buffering Value“ test) at 23°C on three formulations of each material (earth and hemp concrete) at three different thicknesses. The influence of temperature is performed only for hemp concrete formulations on static (sorption curves) and dynamic (MBV tests) tests at 23°C and 40°C. The analysis of the results, made using the support of theoretical models, allows underlining that the thickness involved in the daily passive control of RH remains most of the time limited (only the first centimetre of the earth plasters and 5cm for hemp concretes). However, some surface irregularities may have a strong impact on this active thickness. The other main result of this dissertation is the strong impact of temperature on both static and dynamic hygroscopic characteristics of the material. Indeed, the increase of temperature at a constant RH tends to significantly reduce the water content of the material. But, on the other side, due to higher vapour ...
Moisture buffering capacity of earth mortar plasters and hemp concrete. Effect of temperature and thickness
Simões, Tânia Sofia Ribeiro (author) / Fabbri, Antonin / Faria, Paulina
2015-01-01
Theses
Electronic Resource
English
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