DIGEST 2006 - Sabita

Figure 2: DSR testing at comparative strain levels
temperature (ºC) that the binder
can reliably withstand.
the SA binders from the four
refineries tested yielded the
following:
Bitumen grade 40/50 60/70 80/100 150-200
SHRP SuperPave
Classification:
Refinery A to D
X PG64-16 PG58-22 X
PG64-16 PG58-22 PG58-22 X
PG64-16 PG64-22 PG58-16 PG52-22
PG70-22 PG64-22 PG58-22 PG52-28
Table 1: SA binder classification from fingerprinting July 2005 bitumen samples
For example, PG 64 – 22 would be
appropriate for use in asphalt in
an area with an average 7-day
maximum temperature of 64ºC
and a minimum temperature of
-22ºC. Based on the testing
carried out at Madison a
preliminary SHRP classification of
While a cursory glance at the
classification may indicate that
eight grades are required for SA
binders, the SA climate and the
needs of the SA roads industry
have not yet been considered. It is
conceivable, for example, that the
number of grades could be
140