The 'ductility' of bitumen is measured by:
Choose the correct answer
Rate of bitumen flow under gravity (in seconds)
Length (cm) a briquette stretches before breaking at 27°C, 5 cm/min — measures crack resistance
Hardness as penetration of a needle
Mass loss on heating
Correct Answer
B. Length (cm) a briquette stretches before breaking at 27°C, 5 cm/min — measures crack resistance
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Ductility test (IS 1208): Briquette of bitumen (cross-section 1 cm²) stretched at 27°C and 5 cm/min rate. Ductility = length in cm when the thread breaks. Minimum ductility: VG-30 = 40 cm; VG-40 = 25 cm. Higher ductility → better resistance to cracking under traffic. Used to check bitumen quality and suitability for road use.
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