Page 35 - Microsoft Word - 20120528 Unesco study
P. 35

Wearing course
                  For the surface layer two different materials are used:
                      -   Chip & Spray layer
                      -   Asphalt surface layer

                  In combination with a RoadCem-cement base a Chip&Spray layer is sufficient for the most road
                  types. A RoadCem-cement base will be the structure of the construction and the Chip&Spray
                  acts like a friction course without any structural value.

                  A disadvantage is the limited “body” of this Chip&Spray layer. With a lot of maneuvering of
                  traffic or instantaneous breaking at high speed, the Chip&Spray layer may detach. Therefore,
                  for road types 1 & 2 a construction with an asphalt wearing course is desirable.


































































                                                                                                     34
   30   31   32   33   34   35   36   37   38   39   40