The apparent porosity (AP), bulk density (BD) and WA of sampleswere obtained according to UNE 772-13:2000 [40] and EN 772-7:1998 [41]. The samples were weighted at dry state, then boiledin water for 24 h, and weighted a second time in water, then wereweighted again in their saturated wet state in air. With all theseweights it is possible to determine by calculation all the above-mentioned parameters [42].