1. Senior/Graduate
HMA Course
Superpave Aggregate Properties
Currently Required for HMA
Aggregate Superpave Aggregates 1

2. Coarse Aggregate Angularity Criteria
Traffic Depth from Surface
Millions of ESALs < 100 mm (4”) > 100 mm
< 0.3 55/-- --/--
<1 65/-- --/--
<3 75/-- 50/--
< 10 85/80 60/--
< 30 95/90 80/75
< 100 100/100 95/90
> 100 100/100 100/100
First number denotes % with one or more fractured faces
Second number denotes % with two or more fractured faces
Aggregate Superpave Aggregates 2

3. Flat and Elongated Criteria
Traffic
Millions of ESALs Maximum, Percent
< 0.3 --
<1 --
<3 10
< 10 10
< 30 10
< 100 10
> 100 10
Aggregate Superpave Aggregates 3

4. Fine Aggregate Angularity Criteria
Traffic Depth from Surface
Millions of ESALs < 100 mm (4”) > 100mm
< 0.3 -- --
<1 40 --
<3 40 40
< 10 45 40
< 30 45 40
< 100 45 45
>100 45 45
Aggregate Superpave Aggregates 4

5. Clay Content Criteria
Traffic Sand Equivalent
Millions of ESALs Minimum, Percent
< 0.3 40
<1 40
<3 40
< 10 45
< 30 45
< 100 50
> 100 50
Aggregate Superpave Aggregates 5

6. 100 Aggregate Size Definitions 100
100 99
90 • Nominal Maximum Aggregate 89
72 Size 72
65 – one size larger than the first sieve 65
48 to retain more than 10% 48
36 • Maximum Aggregate Size 36
22 – one size larger than nominal 22
15 maximum size 15
9 9
4 4
Aggregate Superpave Aggregates 6

7. Percent Passing
100
max density line
restricted zone
control point nom max
max size
size
0
.075 .3 2.36 4.75 9.5 12.5 19.0
Sieve Size (mm) Raised to 0.45 Power
Aggregate Superpave Aggregates 7

8. Superpave Aggregate Gradation
Percent Passing
100
Design Aggregate Structure
0
.075 .3 2.36 12.5 19.0
Sieve Size (mm) Raised to 0.45 Power
Aggregate Superpave Aggregates 8

9. Superpave Mix Size Designations
Superpave Nom Max Size Max Size
Designation (mm) (mm)
37.5 mm 37.5 (1.5”) 50 (2”)
25 mm 25 (1”) 37.5
19 mm 19 (3/4”) 25
12.5 mm 12.5 (1/2”) 19
9.5 mm 9.5 (3/8”) 12.5
04.8 mm 04.8 (3/16”) 9.5
Aggregate Superpave Aggregates 9

10. 37.5 mm Superpave Gradation
Sieve Size % Pass. Restricted Zone
mm Control Points Min Max
50 100
37.5 90.0 100.0
25
19
12.5
9.5
4.75 34.7 34.7
2.36 15.0 41.0 23.3 27.3
1.18 15.5 21.5
0.6 11.7 15.7
0.3 10 10
0.15
0.075 0.0 6.0
Aggregate Superpave Aggregates 10

11. 25 mm Superpave Gradation
Sieve Size % Pass. Restricted Zone
mm Control Points Min Max
37.5 100
25 90.0 100.0
19
12.5
9.5
4.75 39.5 39.5
2.36 19.0 45.0 26.8 30.8
1.18 18.1 24.1
0.6 13.6 17.6
0.3 11.4 11.4
0.15
0.075 1.0 7.0
Aggregate Superpave Aggregates 11

12. 19 mm Superpave Gradation
Sieve Size % Pass. Restricted Zone
mm Control Points Min Max
25 100
19 90.0 100.0
12.5
9.5
4.75
2.36 23.0 49.0 34.6 34.6
1.18 22.3 28.3
0.6 16.7 20.7
0.3 13.7 13.7
0.15
0.075 2.0 8.0
Aggregate Superpave Aggregates 12

13. 12.5 mm Superpave Gradation
Sieve Size % Pass. Restricted Zone
mm Control Points Min Max
19 100
12.5 90.0 100.0
9.5
4.75
2.36 28.0 58.0 39.1 39.1
1.18 25.6 31.6
0.6 19.1 23.1
0.3 15.5 15.5
0.15
0.075 2.0 10.0
Aggregate Superpave Aggregates 13

14. 9.5 mm Superpave Gradation
Sieve Size % Pass. Restricted Zone
mm Control Points Min Max
12.5 100
9.5 90.0 100.0
4.75
2.36 32.0 67.0 47.2 47.2
1.18 31.6 37.6
0.6 23.5 27.5
0.3 18.7 18.7
0.15
0.075 2.0 10.0
Aggregate Superpave Aggregates 14

15. QUESTIONS ?
Aggregate Superpave Aggregates 15