| http://www.w3.org/ns/prov#value | - In this case, air voids may alternatively be introduced into the hydraulically settable mixture by adding an easily oxidized metal, such as aluminum, magnesium, zinc, or tin into a hydraulic mixture than is either naturally alkaline (such as a hydraulic cement or calcium oxide containing mixture) or one that has been made alkaline (such as those containing gypsum or another alkaline hydraulic bind
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