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Dense Bituminous Macadam:
A Dense Bituminous Macadam (DBM) is a close-graded premix material having a voids content of 5-10 per cent. Two gradings are normally adopted :
Grading 1
Nominal size of aggregates 40 mm Layer thickness 80-100 mm Bitumen content 4.0 minimum
Grading 2
Nominal size of aggregates 25 mm Layer thickness 50-75 mm Bitumen content 4.5 minimum
The mix design is done by the Marshall method. The binder used is 60/70 penetration grade. Premixing is done in a hot-mix plant, and laying is done by a paver finisher. Rolling is done by 80-100 kN vibratory roller.
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