Assertion: calcium carbonate | /r/ObjectUse | used in road construction
Facets:
value: in theform of limestone aggregate
type: OTHER
value: commonly
type: TEMPORAL
value: as railway ballast
type: PURPOSE
value: directly
type: MANNER
Source sentences:
text: It is also commonly used directly in fillings, road construction and as railway ballast.
text: Calcium carbonate can be used for the road-building in theform of limestone aggregate.