Before designing a bituminous overlay for a distressed flexible pavement using Benkelman beam deflection data, the pavement is categorized as:
Choose the correct answer
Sound (no overlay), marginally adequate, or requiring major overlay, based on characteristic deflection
Only one category - all pavements needing overlay get 40 mm
Only by visual inspection
Based on rutting depth alone
Correct Answer
A. Sound (no overlay), marginally adequate, or requiring major overlay, based on characteristic deflection
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IRC 81 overlay design: characteristic deflection Dc = mean deflection + 2 x standard deviation. Based on Dc and design traffic: if Dc < threshold, no overlay; if marginal, light overlay; if severe, full reconstruction or thick overlay. Overlay thickness from Dc vs traffic chart.
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