The 'California Bearing Ratio' (CBR) value relates to which design method for flexible pavements?
Choose the correct answer
Rigid pavement Westergaard method
Flexible pavement thickness design (IRC:37) — subgrade CBR determines total pavement thickness required
Slope stability analysis
Retaining wall design
Correct Answer
B. Flexible pavement thickness design (IRC:37) — subgrade CBR determines total pavement thickness required
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CBR originally developed by California Highway Division (1940s); used in IRC:37 method for flexible pavement thickness design. Subgrade CBR → determine total pavement thickness from IRC:37 charts/equations (4-wheel design, MSA load). CBR of each layer also used. Low CBR (< 5%) → thick pavement or stabilisation needed.
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