Regarding the procedure, the materials were mixed in dry state for 90 s in a Hobart Planetary mixer at low speed, according to UNE EN 196-1:2005 standard. Afterwards, the arranged amount of water for each mortar was poured over the dry blend and mixed, at slow speed, during the established kneading time for each of them. Once the batches were homogeneous, they were casted in 90 × 90 × 20 mm moulds (Fig. 1) previously covered with a polyethylene layer, to prevent the mixture from sticking to the metal surface. They were poured in two layers, which were compacted with a sinusoidal nominal magnetic vibrator, according to the standard CEN/TC 125 (width of 200 ± 10%, 2950 ± 50 cycles/s, and 50 W of power). Compaction times were 0, 180 and 600 s, in order to study their influence on thermal conductivity.