The 'Flexible pavement' design method IRC:37-2018 is based on:
Choose the correct answer
Only CBR chart from 1970s
Mechanistic-empirical method: cumulative ESALs + subgrade CBR + layer resilient modulus → strain criteria for rutting and fatigue
Only concrete design (no bitumen layers)
Pavement failure by earthquake loading
Correct Answer
B. Mechanistic-empirical method: cumulative ESALs + subgrade CBR + layer resilient modulus → strain criteria for rutting and fatigue
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IRC:37-2018 (3rd revision): mechanistic-empirical design using: (1) Cumulative traffic in MSA (million standard axles); (2) Subgrade CBR (from lab test); (3) Material characterisation (resilient modulus of each layer); (4) Critical responses — vertical compressive strain at subgrade top (rutting) and horizontal tensile strain at bituminous layer bottom (fatigue cracking). Uses IITPAVE software for stress analysis. Replaces old CBR-thickness chart method.
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