Growing road traffic has created the need of pavement structures which can
adapt to this evolution. Concurrently, surfacing techniques have moved in the
same direction to ensure user comfort and safety. Also, to resist the high
deformation caused by these high loads.
Stone-Mastic-Asphalt-mixtures (SMA) have been developed in Germany since
1984, and another mixtures were developed in France.
In this investigation, a comparative study was made between SMA and
mixtures produced using coarse gradation 3B, according to the specs of RBA .
Also, a comparison was made between the two last mixtures and -the most
common mixture in Egypt- the dense gradation 4C.
It was concluded that the coarse gradation mixtures must be used with
additives to increase the Marshall stability and to improve the tensile strength