blast-furnace cement

blast-furnace cement

n
(Building) a type of cement made from a blend of ordinary Portland cement and crushed slag from a blast furnace. It has lower setting properties than ordinary Portland cement
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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But in the Dutch study, adding fly ash to Portland cement reduced a concrete's radon-emission rate "in all cases." For concretes made with "blast-furnace cement," however, adding fly ash increased the amount of radon seepage - though not beyond that seen in normal, ashfree concretes.
Radon: some concrete issues
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