DBM Full Form in road construction is dense bituminous macadam. It can be called as a premix material which is close-graded with a voids content of around 5-10%, and it is utilized as binder course on roads that see a high volume of large commercial vehicles.
It is common practice to split a 90mm thickness into two layers. A hot mix facility is where the mix is made. Although manual mixing is occasionally used, it is not the norm.
Between the surface course and the base course is where you’ll find the DBM binding course, which is typically between 50 and 100 mm thick. It’s a pretty sturdy surface that works well in any environment. For extreme traffic and conditions, this is the preferred layer for traffic engineers.
Its smooth finish and enhanced slip resistance are further benefits. DBM must be created correctly by adhering to standard design approach and satisfying all criteria due to the high quality and cost of DBM. DBM’s mix design takes into account the aggregates’ coarseness, fineness, and filler content.
The key to a great road paving job is in the surface preparation. In the first phase, a mechanical broom and high-pressure air jet are used to clean the surface thoroughly.
The road must be patched and sealed if there are any holes or breaks. A profile rectification course may be required to adjust the current pavement profile, depending on the requirements of the location in question.
This may be done by placing a new layer on top, or by integrating it into the layer above it, with a total thickness of no more than 40mm. The IRC:16-2007 specifies that priming is mandatory.
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