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The thickness of the overlay obtained from design chart is in terms of bituminous macadam construction. What is the conversion if thickness in terms of DBM is required?

The thickness of the overlay obtained from design chart is in terms of bituminous macadam construction. What is the conversion if thickness in terms of DBM is required? Correct Answer 1 cm BM = 0.7 cm DBM

The equivalent thickness of dense bound macadam can be found as 0.7 cm for every 1 cm thickness of bituminous macadam. It can be taken as 1.5 cm for wet bound macadam. In this way, the thickness of overlay for varying compositions can be found out.

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