For proper mixing and production of the mortars, the guidelines
of UNE-EN 196-1 were used. The mixing water, cement and admixture
were inserted in the mixer and mixed for 30 s. Then, the NS,
BBA and compensation water were introduced in the mixer at
low speed for 30 more sec. Finally, all of the materials were mixed
at high speed (280 rev per min) for 30 more sec.
After mixing, the mortar consistency was tested using a shaking
table according to standard UNE-EN 1015-3. Then the moulds were
filled in layers and vibrated on the table. Finally, these moulds
were stored in a chamber at 50% humidity and 20 C for 24 h. After
that period, the moulds were immersed in a tank until testing.