Hydration Degree of Alkali‐Activated Slags: A 29
A commercial blast furnace slag was activated using either sodium hydroxide or hydrous sodium metasilicate, and the degree of hydration was determined by 29
magic angle spinning nuclear magnetic resonance ( Si NMR).
The results are compared with measurements made using scanning electron microscopy image analysis ( SEM‐ IA). The results from both 29 and the Si NMR SEM‐ IA
measurements indicated a fast initial reaction with the alkali, and similar degrees of hydration throughout the reaction. The 29 results were analyzed using two different methods for fitting the residual slag in the decomposition of
the 29 Si NMR spectra: the first method used the spectrum of the anhydrous slag, whereas the second method used the spectrum of the dissolution residue of the hydrated sample. Only the first method provided a satisfactory simulation. The
degree of hydration and the Si NMR atomic ratio within the Al/Si , deduced by 29 C–S–H were in agreement with Si NMR SEM‐ IA
and EDX analyses.
No Supplementary Data
No Article Media
Document Type: Research Article
Publication date: 2011-12-01