Cement reacts with water to form hydrates, which gradually condense and harden. This hardening is caused when the formed hydrates coat cement particles and bind them together. A detailed understanding of the hydrate formation process is expected to lead to the elucidation of the mechanism of condensation and hardening. Since the X-ray diffraction method is a powerful analytical technique for crystalline phase identification, it can identify crystalline hydrates such as ettringite and monosulfate in cements. In this analysis example, we observed changes in the crystalline phase of ordinary Portland cement over time with a water cement ratio (W/C) of 25%.
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