Civil Engineering Reference
In-Depth Information
56
60
31
23
40
30
20
10
0
10
20
30
40
50
60
70
(a)
PG 64 - 34 (98% minimum reliability)
PG 58 - 28 (50% minimum reliability)
40
30
20
10
0
10
20
30
40
50
60
70
(b)
FIGURE 9.22
Example of the distribution of design pavement temperatures
and selection of binder grades: (a) distribution of high and low design pavement
temperatures, and (b) binder grade selection.
Solution
High
-
temperature grade
Ú
57
+
1
2
*
2
2
Ú
61
°
C
Low
-
temperature grade
…-
6
-
1
2
*
3
2
…-
12
°
C
The closest standard PG asphalt binder grade that satisfies the two temperature
grades is PG 64-16.
Other Asphalt Binder Grading Methods
Table 9.4 shows various asphalt ce-
ment grades based on penetration and on their properties (ASTM D946). The
grades correspond to the allowable penetration range; that is, the penetration
of a 40-50 grade must be in the range of 40 to 50. Various grades based on
viscosity and their properties are shown in Table 9.5 (ASTM D3381). The AC
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