American Chemical Society
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Elucidating the Size and Shape of Individual Clinker Phases via Raman Imaging: Impact on Cement Hydration

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journal contribution
posted on 2023-08-17, 12:33 authored by Krishna C. Polavaram, Nishant Garg
Portland cement, produced at 4 billion tons/year, is a key ingredient of concretethe world’s most consumed material after water. The hydration and hardening of cement upon reaction with water are greatly influenced by cement’s chemical composition as well as its overall particle size distribution (PSD). However, given that anhydrous cements are a composite mixture of 8–12 chemically unique phases, the physical characteristics (size and shape) of these individual phases have not been fully explored in the literature. Here, by utilizing Raman imaging, we report, for the first time, phase-specific PSDs and shape characteristics for all individual components in a set of 10 commercially available diverse cements. By combining these physical characteristics with chemical abundance, we define a composition-size quotient parameter (CSQ), which is able to predict the 72 h cumulative heat upon hydration (R2 = 0.86)a key indicator of performance, underscoring the importance of such phase-specific physical characteristics.

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