The penetration value of bitumen (as per IS 1203) measures:
Choose the correct answer
Viscosity at 60 deg C in poise
Depth in tenths of mm that a standard needle penetrates bitumen in 5 s under 100 g load at 25 deg C
Ductility at 25 deg C
Softening point in deg C
Correct Answer
B. Depth in tenths of mm that a standard needle penetrates bitumen in 5 s under 100 g load at 25 deg C
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Penetration test: 100 g load, 5 s, 25 deg C; depth of needle penetration in 0.1 mm units. Grades: 30/40 (hard, cold regions not applicable in India), 60/70 (most common in India for hot weather roads), 80/100 (for surface dressing, milder climates). Higher penetration = softer bitumen. VG grades (IS 73) have largely replaced penetration grades.
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