Why is it preferable for SMA layer to be cooled below 40o before opening to traffic?

Posted in Highway Engineering | Email This Post Email This Post |
Print Friendly, PDF & Email

SMA contains high binder content and extreme care should be taken during the placing process of SMA. Multi-tyred rollers are not used in paving SMA because of the possible working of binder to the surface of the
SMA leading to flushing and pick-up.

By the same reason, trafficking of newly-placed hot SMA also produces the same effect of flushing the binder to the surface. As such, it is preferable to have the SMA cooled below 40obefore opening to traffic.


This question is taken from book named – A Self Learning Manual – Mastering Different Fields of Civil Engineering Works (VC-Q-A-Method) by Vincent T. H. CHU.

More Entries :