The 'AASHTO pavement design' method uses 'structural number' (SN) which depends on:
Choose the correct answer
Only subgrade CBR
Layer coefficients (material strength) and thicknesses for each pavement layer, adjusted for drainage
Only total pavement thickness
Traffic volume in PCU per day only
Correct Answer
B. Layer coefficients (material strength) and thicknesses for each pavement layer, adjusted for drainage
AI Detailed Explanation & IS Code Reference
Unlock the reasoning, formula path and code-linked notes inside your student dashboard.
AASHTO structural number: SN = a1D1 + a2D2m2 + a3D3m3 where a = layer coefficient (depends on material strength), D = layer thickness (inches), m = drainage coefficient. SN is a function of design traffic (ESALs), subgrade resilient modulus, and reliability. Used in USA; IRC:37 uses CBR-based method for India.
ScoreCardAI links this solution with subject, topic and difficulty signals so your scorecard can identify weak areas after a full mock test.
Practice more Civil Engineering questions
This MCQ belongs to JE Level Premium Test Series. Full tests include timed attempts, rank comparison and subject-wise analysis.