Civil Engineering MCQJE Level Civil Engineering

The 'Marshall stability' test temperature of 60°C simulates:

Transportation EngineeringTransportation EngineeringMEDIUM

Choose the correct answer

A

Average annual temperature of 20°C

B

Maximum summer pavement temperature (surface interior at ~60°C in India) — weakest condition for bituminous mix

C

Temperature during bitumen mixing at plant (160°C)

D

Frost temperature in cold regions

Correct Answer

B. Maximum summer pavement temperature (surface interior at ~60°C in India) — weakest condition for bituminous mix

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Marshall stability test (IS 2386 / ASTM D1559): cylindrical bituminous mix specimen tested in compression diametrically at 60°C. Temperature 60°C: represents maximum pavement surface temperature in Indian summer (road surface can reach 70–80°C; interior at 5–6 cm depth ≈ 60°C). At high temperature: bitumen softens → strength critical. Marshall stability: measures resistance to rutting at max service temperature. Mix design: minimum stability criteria (MORTH Table 500-11).

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