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Home > Forums > Civil / Environmental Engineers > Activities > Earthwork/grading engineering Forum

Compaction in bituminous premix

thread158-324031
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yashrai041 (Civil/Environmental)
16 Jun 12 9:23
Dear All,

I go through MORTH specification. In clause 501.6, regarding compaction of bituminous materials, i didn't get initial or breakdown rolling, intermediate rolling and finish rolling. What i knew is rolling by smooth roller only for premix compaction. Please someone could clearify and suggest best practise.

best regards
govinda
Ron (Structural)
19 Jun 12 6:27
Each rolling process has a purpose. Read publications from The Asphalt Institute or similar that describe the various rolling processes.

If you have a common structural gradation of hot mix asphalt, breakdown rolling is very important to achieve a durable asphalt layer. Finish rolling does not provide adequate compaction of the asphalt and if that is the only rolling that gets done, your pavement will likely fail prematurely.
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