We know that a minimum amount of air void should be maintained to avoid instability during
compaction process. But there might be some other importance for sure. I want to know the other importance.
Dear Debnath,
The volumetric properties of bituminous pavements are the most critical parameters for its strength and durability characteristics. Apart from minimum, maximum air void content (AVC) should also be limited to a certain range. The low AVC would not be able to provide a sufficient scope of compression on the application of loading and result in bleeding and unstable mix. Whereas, the high AVC would result in permanent deformation. It also allows excess air and water to accumulate within the bituminous layer, which in turn, leads to several other distress.
Hi..
The importance of (AVC) may be summarized as below
1- to accomplish sufficient compaction without bleeding of binder..
2- In future (AVC) is necessary to resist the additional compaction from the traffic load without causing bleeding
3- In the other hand high (AVC) content makes the mixture not strong enough ..also the pavement may be damaged by water which can be in the voids..therefore the AVC should be limited to a certain range.
The air void content should be within specified range for the purpose of strength and durability since the pavement will be subjected to secondary compaction during operations.
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