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Ana Sofia GUIMARAES and Isabel Martins RIBEIRO; Gamma ray attenuation technique to the measurement of moisture content profiles in porous building materials; Advanced Materials and Technologies Environmental Sciences; 2017:1(3):108-117
The knowledge of moisture transport in porous building materials and components is crucial to predict and avoid several pathologies and is essential to increase the durability. It is easy to know the amount of water that, for example, some material absorbs when in contact with water. However, it is very difficult to determine where the water is, the water transport process, the water movement, etc. Using the gamma ray attenuation technique, it is possible to determine the water content along a building material or component and obtained the water content profile in different moments. So, with this tool, several phenomena can be studied such as: the wetting and drying processes, the thermal performance, waterproof behavior, etc,. This paper presents the gamma ray attenuation technique, the way that the water content profiles can be obtained, some interesting water content profiles obtained for a material, monolithic and multilayered and the discussion of those results.