About: http://webisa.webdatacommons.org/218355337

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	These components are well known in the art and generally include a Portland cement, an aggregate such as sand and water.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com