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If the design traffic is 15 msa and a characteristic deflection of 3 mm, compute the thickness of overlay if DBM binder course and bituminous concrete (BC) surface course is to be adopted. What would be the thickness of the BC surface course?

If the design traffic is 15 msa and a characteristic deflection of 3 mm, compute the thickness of overlay if DBM binder course and bituminous concrete (BC) surface course is to be adopted. What would be the thickness of the BC surface course? Correct Answer 51 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 15 msa and 3 mm characteristic deflection, the overlay thickness in terms of bituminous macadam is 215 mm. Now to find the thickness of DBM, 1 cm BM = 0.7 cm DBM, i.e. 21.5 cm BM = 0.7 X 21.5 = 15.05 cm ≈ 15.1 cm = 151 mm Out of the 151 mm, 100 mm can be provided for DBM and 51 mm for the bituminous concrete surface course.

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