Yes and yes.
The Romans used wiki/Pozzolana as an amendment.
Quote:
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The designation pozzolana is derived from one of the primary deposits of volcanic ash used by the Romans in Italy, at Pozzuoli. The modern definition of pozzolana encompasses any volcanic material (pumice or volcanic ash), predominantly composed of fine volcanic glass, that is used as a pozzolan.
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The Grand Coule Dam and possibly others on the Columbia used pozzolan.I can't find a reference so that's IIRC.
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