2.3.6. X-ray Diffractometry Analysis—XRD

For the XRD analysis, the residue and paste samples were sieved through a 200 mesh (0.074 mm) opening sieve and taken to an oven at 110 ◦C for 24 h. The pastes were composed of CP V cement and water (CH2O), CP V cement with 30% of OSPW (COSPW) and water, and CP V cement with 30% sand and water (CS). For the XRD analysis, the CPV was used due to its composition, which does not register the presence of blast furnace slag, which is not in the CPII and CPIII types. The absence of blast furnace slag granulate contributes to the observation of phase formations and the presence of the main components when the sample is incorporated with OSPW [31].

The samples were mixed with isopropyl alcohol for 3 m in a 1:10 volumetric ratio (cement and alcohol), in a glass container with a glass rod. It was filtered and left to dry in a desiccator at 20 ◦C until it reached the consistency of the masses [30], and it was analyzed at the age of 28 days. Qualitative crystalline phases were obtained by XRD, in Proto Manufacturing equipment, XRD Powder Diffraction System: the generator of 30 kV and 2 mA, Cu-Kα1 radiation, angular step of 0.0149◦ , time interval of 0.5 s, sweep of 47 min and 2θ ranging from 5◦ to 60◦ . The crystalline phases in the residue were identified with reference to COD.
