The 'Marshall stability' of a bituminous mix is the maximum load the specimen resists when tested at:
Choose the correct answer
25°C, ambient temperature
60°C — simulates peak summer road temperature; stability ≥ 8 kN for heavy traffic
100°C (boiling)
0°C (cold resistance test)
Correct Answer
B. 60°C — simulates peak summer road temperature; stability ≥ 8 kN for heavy traffic
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Marshall test (ASTM D6927 / IS 73): compacted cylindrical specimen (100 mm dia × 63.5 mm) tested at 60°C (simulates peak road surface temp in India) by loading diametrically at 50.8 mm/min. Marshall Stability = peak load (N or kN); Flow = deformation at peak (mm × 0.25). Stability > 8 kN for heavy traffic (per IRC:37). OBC determined where stability peak and optimum voids intersect.
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