Using IRC: 37-1984 “Guidelines for the Design of Flexible

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Using IRC: 37-1984 “Guidelines for the Design of Flexible Pavements” and the following data, choose the total thickness of the pavement.
No. of commercial vehicles when construction is completed = 2723 veh/day
Annual growth rate of the traffic = 5.0%
Design life of the pavement = 10 years
Vehicle damage factor = 2.4
CBR value of the subgrade soil = 5%
Data for 5% CBR value

1. 620 mm
2. 640 mm
3. 670 mm
4. 700 mm

Correct Option: C

Axle load =	365 × A × [(1 + r)ⁿ - 1]	× F
	Y

=	365 × 2723 × [(1 + 0.05)¹⁰ - 1]	× F
	0.05

= 30 × 10⁶axle load = 30 msa
For 30 msa, thickness = 670 mm