Assertion: pozzolanic mortar | /r/MadeOf | an additive of volcanic ash
Facets:
Source sentences:
text: Pozzolanic mortar is a lime based mortar, but is made with an additive of volcanic ash that allows it to be hardened underwater; thus it is known as hydraulic cement.
text: Pozzolanic mortar is a lime based mortar, but is made with an additive of volcanic ash that allows it to be hardened underwater; thus it is known as hydraulic cement.