I am currently using steel furnace slag (SFS) aggregate into concrete. The chemical composition of the SFS aggregate is provided in the pic and the DSC-TGA curve is also provided. You can see from table that it contains high amount CaO. A fraction of this CaO remains as free. I need to measure the amount of CaO that remains as free. and may cause expansion by delayed hydration. I need to measure the amount of CaO that remains as free.

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