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Abstract: This article studies the thermal properties of grout used in geothermal energy applications. A number of different cement based sealants were analyzed by the authors to understand how the thermal conductivity and thermal diffusivity change as they are exposed to conditions similar to what they withstand when they are in use. Moisture content was of particular importance, as the porous grouts easily absorb the groundwater that they come in contact with. The authors found that density and moisture content have a large influence on the thermal conductivity and diffusivity of the grouts, and that the values change substantially between dry grout and grout that has been exposed to moisture.

Reference: Journal of Energy and Power Engineering 7 (2013) 1457-1463