This test is of importance , because it is necessary to be sure that the viscosity of a given bitumen is suitable at the temperature used in manufacture, also , at the temperature likely to be encorentered on the road , the following method covers the determination of the softening point o bitumen having softening point in the ranges of 80 c or below by means of a ' ring and ball apparatus' . R RING AND BA
BA
Standard : ASTM 36-76.
Test - equipment
LL METHOD
- Ring and ball apparatus
Accessories:
- Two brass rings
- Two steel balls 9.5 mm dia.
- Two brass ball centering guides
- Glass vessel
- Glass thermometer -2 +80°C.