Updating Bituminous Stabilized Materials Guidelines Mix Design Report Phase II

Figure J.4: The measuring wheel of the Profilometer roll on surface of briquette
The profilometer is placed on the index bars when measuring the surface of the briquettes. The
index bar is there as a reference for future readings on the same briquette, see Figure 3.
The first profile measurement taken on each briquette before any load application, this is the
zero reading before any deformation. After each loading interval, the height of the briquettes is
measured. The deformation readings are stored electronically. The readings of all the intervals
of one definite briquette plotted on a single graph and then illustrate the deformation to load
repetitions.
The rut depth of a number of loads repetitions is defined as the maximum vertical downwards
deformation in the wheel track. The upward deformation next to the wheel track defined as the
heaving. It occurs when material from the path of the wheel pushing outwards to the side of the
wheel, either through creep or through classical shear. This phenomenon however, is typical for
the HMA, and not for BSMs.
A typical example of HMA surface profile after trafficking presented in Figure J.5 below.
Figure J.5: Typical plot of the HMA surface of deformed profile
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