SECTION 1028 -- SUPERPAVE ASPHALTIC CONCRETE

Table 1028.08
Gradation Control Points for 0.75 Inch (19 mm) Nominal Size
English Sieve
(Metric)
1 inch (25 mm) 100.0
Control Points
(percent passing)
3/4 inch (19 mm) 90.0 100.0
1/2 inch (12.5 mm) 90.0
- 668 -
Restricted Zone Boundary
(percent passing)
Minimum Maximum Minimum Maximum
No. 8 (2.36 mm) 23.0 49.0 34.6 34.6
No. 16 (1.18 mm) 22.3 28.3`
No. 30 (600 µm) 16.7 20.7
No. 50 (300 µm) 13.7 13.7
* No. 200 (75 µm) 2.0 8.0
* Dust to binder ratio is the ratio of the percentage by weight of aggregate finer
than the No. 200 (75 µm) sieve to the effective asphalt content expressed as a
percent by weight of total mix. Effective asphalt content is the total asphalt
used in the mixture less the percentage of absorbed asphalt. The dust to
binder ratio shall be between 0.6 and 1.2. This shall be verified during mix
design approval.
m. The combined mineral aggregate for Asphaltic Concrete, Type
SPS, shall be an aggregate or a combination of aggregates, and mineral filler if
needed. The field target air voids shall be a minimum of 1.5 percent with
maximum field air voids of 5.0 percent, based on the moving average of four
tests.
Table 1028.09
Gradation Control Points for Type SPS
English Sieve
(Metric)
Control Points
(percent passing)
Minimum
1 inch (25 mm) 100.0
Maximum
3/4 inch (19 mm) 94 100.0
1/2 inch (12.5 mm) 81 94
No. 8 (2.36 mm) 42 70
No. 16 (1.18 mm) 29 43
No. 30 (600 µm) 19 34
No. 50 (300 µm) 11 20
* No. 200 (75 µm) 2 8
n. Mineral filler shall consist of pulverized soil, pulverized crushed
rock, broken stone, gravel, sand-gravel, sand or a mixture of these materials
that conforms to the following requirements.