100mm cubes are cured for 28 days. The density of each set of cubes was determined before measurement of thermal conductivity began. Thermal conductivity testing was performed by cutting each concrete sample in half, and sandwiching a 6.403 mm Hot Disk sensor composed of nickel foil surrounded by Kapton between the two pieces. Thermtest also offers a single sided sensor, the TPS-S, which only requires one sample piece to measure thermal conductivity; an excellent option for clients who have expensive or hard to cut materials. The Hot Disk Thermal Constants Analyzer is ideal for testing porous materials like concrete as it performs absolute measurements and does not require a contact agent. In order to account for the heterogeneous microstructure of the cubes, the probe was placed in different places between the two samples and the average thermal conductivity will be calculated.
Bentz, D.P., Peltz, M.A., Duran-Herrera, A., Valdez, P., Juarez, C.A. 2011. Thermal properties of high-volume fly ash mortars and concretes. Journal of Building Physics. 34(3): 263-275.
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