About: http://webisa.webdatacommons.org/270741889

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	Pozzolans, which are siliceous materials such as fly ash that react with lime to form cementitious materials, and even cement, although subject to many severe limitations as described above, might be useful in some cases.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com