Ring and Ball apparatus is used for the following test of bitumen:
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Answer: D
The Ring and Ball apparatus is used for the Softening Point test.
A steel ball is placed on a disc of bitumen held in a brass ring, and the water or glycerine bath is heated at a fixed rate. The temperature at which the softened bitumen sags and lets the ball touch a plate 25 mm below is the softening point.
Penetration is measured with a penetrometer needle, viscosity with a viscometer, and ductility with a ductility machine that stretches a briquette.
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