The thermal power plant waste namely, the fly ash, normally contains Mullite (Al2O2 and SiO2) minerals and quartz mineral. My question is when this fly ash is being used as supplementary cementitious materials in concrete as cement replacement, whether they are completely taking part in the hydration reaction (pozzolanic reaction)? Gaining of strength in concrete by using fly ash after several days of curing in immaterial to me.
In that case, how much quantity of fly ash is being utilized?
Dear Maheswaran
Not always. The use of fly ash will depend upon the available quantity of calcium hydroxide derived from the hydration of the C3S and C2S. Thus, if the amount of fly ash is too large, there will be no complete consumption of the fly ash and thus a certain quantity will remain in the matrix without pozzolanic action. So you must to concern about the saturation content of fly ash, above which there is no significant gain in later strength. In order to improve your analysis I suggest to take a preliminary look at these publications:
http://www.ijetae.com/files/Volume4Issue7/IJETAE_0714_41.pdf
http://www.cement.org/docs/default-source/fc_concrete_technology/is548-optimizing-the-use-of-fly-ash-concrete.pdf
Thank you Dr. Antonio D. Figueiredo and Dr. Ari Teger for your answers.
Thank you, Dr.Hassnen Jafer for your answer.
Regards, Maheswaran
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