About: http://webisa.webdatacommons.org/444719082

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Portland cement is a powder that hydrates (combines chemically with water), to form a paste that binds sand, gravel, and stone into a rocklike mass called concrete. ??
http://www.w3.org/ns/prov#wasQuotedFrom	britannica.com