*2.2. Mixture Design and Production of Specimens*

The mixture labels are presented in Table 3, and they consist of a binder-to-sand volume ratio of 1:3, a water-to-solids-in-the-binder mass ratio of 0.41, where the solids in the binder are composed of r-MgO and BFA in a volume ratio of 2:3. Four cubic-shaped specimens with 40 mm edge were produced for each mixture label based on the methodology described in recent studies [8–10]. A pressurised ACC chamber of approximately 75 litres was used, and an initial partial vacuum pressure of 0.2 bar was applied. Afterwards, the following ACC conditions were provided: CO2 concentration > 99%; CO2 partial pressure = 0.7 bar; T = 60 ± 2 ◦C; relative humidity (RH) > 99%; and AAC period = 24 h. Following the AAC period, the CRMC-based specimens were immediately stored in lab room conditions (20 ± 2 ◦C and an RH of 60 ± 5%) for 24 h to cool them before compressive strength testing.

