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If the design traffic is 20 msa and a characteristic deflection of 4.5 mm, what would be the thickness of bituminous macadam overlay if WBM binder course is to be laid?

If the design traffic is 20 msa and a characteristic deflection of 4.5 mm, what would be the thickness of bituminous macadam overlay if WBM binder course is to be laid? Correct Answer 400 mm

The thickness of the overlay in terms of bituminous macadam can be read from the design chart using Fig 9 in IRC 81:1997. The chart can be referred to by using the link below: https://archive.org For 20 msa and 4.5 mm characteristic deflection, the overlay thickness in terms of bituminous macadam is 265 mm. Now to find the thickness of WBM, 1 cm BM = 1.5 cm WBM, i.e. 26.5 cm BM = 1.5 X 26.5 = 39.75 cm ≈ 40 cm = 400 mm.

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