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X-ray diffraction (XRD) technique has been used in several works to characterize cementitious materials. XRD pattern allows the study of cement hydration products at different curing ages and with different materials additions by analyzing peak positions and relative pattern intensities [1-3]. Quantitative phase analysis (QPA) can also be carried out in order to determine the (hydrated) cement phases’ concentration, as peak intensity is related to weight fraction [4]. Gray Portland cement contain alite (C3S 3CaO.SiO2), belite (C2S 2CaO.SiO2), aluminate (C3A 3CaO.Al2O3), and ferrite (C4AF 4CaO.Al2O3.Fe2O3) as major phases. Silicate phases, which significantly contribute to the cement matrix strength at hardened state [5], have polymorphism as a function of temperature stabilization. Alite has 7 polymorphs [6], and belite has 5 polymorphs [7]. On the other hand, pure aluminate does not exhibit polymorphism, although composition variation leads to structure variation [8]. The main product of hydrated Portland cement paste is calcium silicate hydrate (C-S-H), which is formed due to alite and belite reactions with water. This component exhibits amorphous or low crystallinity characteristics. C3S and C2S hydration reactions also produce calcium hydroxide (portlandite), which is crystalline and is the second main product of the hydrated paste. Ettringite and monosulphate phases are products of aluminate and ferrite hydrations, and their concentrations are due to the hydration degree of paste and aluminate and ferrite quantity [9]. When exposed to XRD investigation of cement pastes incorporating concrete floor polishing waste