| http://www.w3.org/ns/prov#value | - In one manner of practicing the invention, the compound above set forth is mixed, dry, or in water or other carrier, into a mixture which is to be prepared into a hardened hydraulic cement concrete, at any time prior to the hardening of such mixture into a hardened concrete, and, except for the presence of such compound, conventional materials and means are used to prepare the finished concrete.
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