Due to differences in desulfurization processes and coal quality among power plants, the composition of desulfurization ash is not fixed.
Therefore, using desulfurization ash may not necessarily slow down the setting of concrete.
When the proportion of calcium sulfite in desulfurization ash is high, it will cause poor compatibility between cement and admixtures, decreased stability of concrete, increased drying shrinkage, and delayed setting of concrete, with a delay time exceeding 48 hours or even longer.
And the later strength of concrete may also decrease.
There is data indicating that when the content of calcium sulfite reaches 60%, desulfurization ash will reduce the 90 day strength of concrete by 10MPa.
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