Micro-Raman spectroscopy has been used in the study of the prehydration of tricalcium aluminate (C3A) in the presence and absence of hemihydrate. This technique was used to determine the molecular ...structure of samples. When combined with SEM (scanning electron microscopy) and EDS (Energy-dispersive X-ray spectroscopy), Raman spectroscopy can be a valuable analytical tool. Micro-Raman measurements were performed at room temperature using a Horiba Jobin Yvon HR 800 LabRAM instrument equipped with an Olympus BX40 microscope (focus graduation 1ìm), a He-Ne 20 mW laser working at 633 nm, and a multi channel air-cooled CCD detector. The binary systems of tricalcium aluminate (cubic and orthorhombic) in the presence of hemihydrate were prehydrated at 80°C, 80% RH for 3 days. The samples were also analyzed by XRD (X-ray diffraction) to confirm the phase composition. The Raman spectras of unhydrousC3A and unhydrous hemihydrate samples agreed with the results of X-ray diffraction analyses. The results of the tests of the binary mixtures have shown that, by using Raman spectroscopy, CaCO3 polymorphs can be detected, which was confirmed by means of X-ray diffraction.
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