*2.4. Test Methods*

X-ray fluorescence spectrometry analysis (XRF) was realized with ZSX PRIMUS IV, Rigaku equipment. A Bruker D8 Discover A 25 diffractometer were used for to obtain X-ray diffraction (XRD) patterns. A CuKα radiation (λ = 1.54050 A; 40 Kv; 30 mA) was ˙ used and scan angles between 10◦ to 70◦ (2θ) were programmed. The speed used was of 0.02 2θ min−1. For identifying the diffractograms, the International Database ICDD 2003 was used [62].

TGA/DTA were performed using a Setaram Setys Evolution 16/18 instrument with a resolution of 0.002–0.02 μg. The heating increase was 5◦ min<sup>−</sup>1.

The flexural (FS) and compressive strength (CS) were obtained according to the European Standard EN 1015-11 [61] for 1, 3, and 7 d of curing. The dry bulk density (DBD) of hardened samples was determined according to European Standard EN 1015-10 [63]. Accessible porosity for water (APW) were measured according to European Standard UNE 83980 [64].

The morphology and composition of the mixes with NA and RMA under the CC regime were studied using H2O and CO2·H2O. SEM, EDS, and BSE were obtained using JEOL JSM 7800F at the age of 7 d. The objective was to observe the effect of carbonated water on the microstructure of the hardened samples, with NA and RMA cured under CC regime. They were then sputtered with gold to obtain the maximum image quality.

All the above tests were carried out in triplicate.

#### **3. Results and Discussion**
