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Articles by Ippei Maruyama
Vibrational and First-Principles Analyses of Aragonite, Calcite, and Vaterite CaCO3 Prepared from 13CO2 Isotope
4.1. XRD, TG, FE-SEM and FTIR The XRD patterns of the CaCO 3 polymorphs are shown in Figure 2 , and the content of each crystalline phase quantified by Rietveld analysis is shown in Table 2 . Note that Rwp (Weighted Profile R-factor) here is a dimensionless number representing the fit quality in Rietveld analysis. Since all values are around 10, this indicates that the fitting was good. Furthermore, it is considered that the targeted crystalline phase was obtained. Figure 2 Figure 2.
Understanding the Carbonation Phenomenon of C–S–H through Layer Structure Changes and Water Exchange
Ancient Roman concrete mineral found strengthening nuclear reactor walls
In a list of walls that you’d want to stay strong, those in a nuclear reactor would be near the top. Now, researchers have found that the walls in a decommissioned power plant in Japan have not only kept their strength but have actually gotten stronger with use, thanks to a rare mineral also found in ancient Roman concrete. We tend to think of our modern materials as superior to the primitive ones of old, but that’s not always the case.
Ionic conductive and photocatalytic properties of cementitious materials: calcium silicate hydrate and calcium aluminoferrite
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