For C-S-H with Ca/Si = 1.5, Moudrakovski et al. observed a clear left shoulder of the main peak which was not seen for Ca/Si = 1.2. This finding can be explained by the change in the silicate chain structure. The increase in Ca/Si is accompanied by a decrease in the MCL, therefore in an expected increase in the number of bridging Ca sites . Therefore, at Ca/Si = 1.5 a higher number of bridging Ca sites is expected than at Ca/Si = 1.2. While the spectrum is too broad to identify a clear chemical shift of this Ca site, it suggests the existence of a Ca site at higher frequencies, that can be assigned to the bridging Ca site.