Civil Engineering Reference
In-Depth Information
T ABLE 9.10
Superpave Mix Design Criteria
Design Air Voids
4%
Dust to Effective Asphalt
1
0.6-1.2
Tensile strength ratio
80% min
Nominal Maximum Size (mm)
37.5
25
19
12.5
9.5
4.75
Minimum VMA (%)
11
12
13
14
15
16
G
mm
and VFA Requirements
Percent Maximum Theoretical
Specific Gravity
Design EASL in
Percent Voids Filled
2,3,4
millions
N
init
N
des
N
max
with Asphalt
6 0.3
… 91.5
96
… 98.0
70-80
0.3-3
… 90.5
96
… 98.0
65-78
3-10
… 89.0
96
… 98.0
65-75
10-30
… 89.0
96
… 98.0
65-75
Ú 30
… 89.0
96
… 98.0
65-75
Notes
1. Dust-to-binder ratio range is 0.9 to 2.0 for 4.75 mm mixes.
2. For 9.5 mm nominal maximum aggregate size mixes and design
VFA
Ú
3
million, VFA
range is 73 to 76% and for 4.75 mm mixes the range is 75 to 78%.
3. For 25 mm nominal maximum aggregate size mixes, the lower limit of the VFA range shall
be 67% for design traffic levels million ESALs.
4. For 37.5 mm nominal maximum aggregate size mixes, the lower limit of the VFA range
shall be 64% for all design traffic levels.
6 0.3
P
s
G
b
1
G
se
-
G
sb
2
P
be,est
=
P
b,est
-
(9.18)
G
se
G
sb
P
D
P
be,est
D/B
est
=
(9.19)
where
P
b,est
=
adjusted
estimated binder content
VMA
determined from volumetric analysis
VFA
VMA
est
=
adjusted
VMA
t
=
VMA
VFA
est
=
adjusted
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