Portland cement hydration analysis
This is the result of 29Si SP MAS NMR. The background spectrum (anhydrous cement) is subtracted from result spectrum to get a substracted spectrum, which is then is fitted to several spectra. The residual is on the top. Each of the fitted spectra present one type of silicon atom in different known environments, which reveal the nanostructure of hydration products and the degree of hydration. The results are quantitative.
Submitted by Dr. Qiu Li, University of Greenwich, Medway Science, United Kingdom