Location of Aluminum in Substituted Calcium Silicate Hydrate (C‐S‐H) Gels as Determined by ²⁹ Si and ²⁷ Al NMR and EELS

Abstract

Solid‐state 27 Al and 29 Si magic angle spinning NMR spectroscopy has been combined with electron energy loss spectroscopy carried out in the transmission electron microscope to determine the location of Al substituting in a semicrystalline C‐S‐H gel present in a hydrated synthetic slag glass. The gel is found to contain mainly pentameric silicate chains in which the central silicon is substituted by aluminum.