as well as how additions such as fly ash, limestone fillers are involved in the hydration process, i.e. is there a term to be added to the Arenius equation?
Degree of hydration can be observed through advance instruments such as FTIR, XRD, SEM EDS and TGA.
You may see details in my research Articles. https://www.sciencedirect.com/science/article/pii/S0950061818305270
The degree of cement hydration can be determined using the following methods at different ages;
1) compressive strength - increase in compressive strength with age might be a good indication of the hydration process. In cases where SCMs are not included, a larger percentage of the hydration would have occur by 28 days
2) SEM - this would give you an indication of the process in the densification of the microstructure as a result of increase in product formation as the hydration process progresses
3) Permeability test - the permeability of cement composite has been known to reduce with age due to the formation of more products as a result of the hydration process which further densify the microstrutcure
4) non destructive tests - non destructive tests such as UPV, rebound hammer and werner probe might also be helpful
Personally, I'd suggest a combination of SEM image analysis, calorimetry, chemical shrinkage, thermal analysis and x-ray diffraction. With many of these techniques you can also differentiate between hydration of the clinker and the addition.
I'd suggest looking at the work of Mark Whittaker and Sam Adu-amankwah, both of whom used these methods in their studies.
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