Fig. 1: Initial characterization of the employed Portland cements. | Nature Communications

Fig. 1: Initial characterization of the employed Portland cements.

From: 4D nanoimaging of early age cement hydration

Fig. 1

a Textural analysis of the two cements: PC-52.5 and PC-42.5, with Blaine values of 409 and 368 m2kg−1, respectively. (top) Particle size distributions, (bottom) cumulative volume variation as measured by laser scattering. b Isothermal calorimetric study, T = 25 °C, for the cement pastes prepared with w/c values of 0.50 and 0.40, referenced to 1 g of anhydrous cement. (Top) Heat flow curves (where the typical hydration stages are sketched), (bottom) cumulative heat traces for the two cements. c Laboratory Rietveld plots (MoKα1 radiation, λ = 0.7093 Å) for PC-52.5 paste, w/c = 0.40, within a capillary of 1 mm of diameter. The main diffraction peaks are labelled with the contributing crystalline component by using the cement notation: tetracalcium aluminoferrite (C4AF), belite (C2S), alite (C3S), tricalcium aluminate (C3A), calcite (Cc), portlandite (CH) and ettringite (AFt). (Top) Pattern collected at 22 h, (bottom) pattern collected at 96 h of hydration.

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