I'm working on isothermal calorimetry analysis of alkali-activated GGBS-based binders and would like help interpreting the heat evolution curve. I observed a rapid initial peak (related to wetting/dissolution), followed by a dormant period, and then a second, broader peak. However, the timing and intensity of the second peak vary significantly depending on the NaOH molarity and silicate modulus.
1-What are the key hydration reactions represented by the second peak in GGBS systems?
2-How do changes in NaOH molarity or activator composition (e.g., silicate modulus) influence the shape and timing of this peak?
3-Any suggestions on typical total heat release values for GGBS-based geopolymers?
I think this article might be helpful for you
Article Properties of alkali-activated slag mortar and prediction of...
Dear Mohamed Abd Ellatief ,
going straight to point 3 of your question…Geopolymers aren’t hydraulic materials so you cannot find the answer of your doubt if you don’t analyze the correct material 😅🤷🏻♂️.
Cannot exist a Geopolymer material made of GGBS only because it hasn’t enough reactive alumina to Geopolymerize. Alkali Activated Slag isn’t a polymer but still a hydraulic reaction so cannot be compared with Geopolymer material that may contain GGBS , but never alone and ,for sure, it is manufactured following a mix design totally different. In GP materials you cannot find any NASH or KASH (where H means hydrate, OH group) because these type of salts cannot be formed in Geopolymerization. You confirmed this directly from the title of your study that deals with hydration of GGBS in AAS (AAslag)
Regards
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