UFC 3-250-03
15 May 2001
Table 2-7
Design Criteria
Section 1. Procedure for Determining Optimum Asphalt Content
Point of Curve
Property
Type of Mix
50 Blows
75 Blows
Marshall stability
Hot-Mix Asphalt surface course
Peak of curve
Peak of curve
Hot-Mix Asphalt intermediate course
Peak of curve
Peak of curve
______a
Sand asphalt
Peak of curve
Unit weight
Hot-Mix Asphalt surface course
Peak of curve
Peak of curve
Hot-Mix Asphalt intermediate course
Not used
Not used
______a
Sand asphalt
Peak of curve
Flow
--
Not used
Not used
Percentb
Hot-Mix Asphalt surface course
4
4
voids total mix
Hot-Mix Asphalt intermediate course
4
4
______a
Sand asphalt
6
80c
75c
Percentb
Hot-Mix Asphalt surface course
voids filled with
80c
75c
Hot-Mix Asphalt intermediate course
asphalt
______a
Sand asphalt
70
(Continued)
a
Sand asphalt will not be used in designing pavements for traffic with tire pressures in excess of
690 kPa (100 psi).
b
The theoretical maximum specific gravity can be determined either with the apparent specific gravity
as determined in ASTM C-127 and C-128 or by the use of ASTM D 2041. ASTM D 2041 will be used
for absorptive aggregate.
c
If inclusion of asphalt contents at these points in the average causes the voids total mix to fall outside
the limits, then the optimum asphalt content should be adjusted so that the voids total mix is within the
limits.
2-22
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