The town building department doesn't want us to use concrete mixed with flyash. Do you have any information on contamination in flyash?

The building inspector has no jurisdiction to keep you from using the material, because at this time it has been approved for use in concrete.

But for me, the jury is still out on the use of flyash in concrete. The immediate idea of using flyash to reduce the use of Portland cement and to gain greater strength sounds great. But like many other new materials that have come along, and later have been found to have environmental issues, flyash may also follow that path. The

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