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SuperpaveTM Mix Design
CIVL 3137 2
Marshall Mix Design Steps
1. Select suitable aggregates
2. Select a suitable asphalt binder
3. Select a suitable aggregate structure
4. Mix and compact samples in the lab
5. Analyze mix volumetrics (air voids, etc.)
6. Select the optimum asphalt content
7. Evaluate moisture susceptibility
CIVL 3137 3
Superpave Mix Design Steps
1. Select suitable aggregates
2. Select a suitable asphalt binder
3. Select a suitable aggregate structure
4. Mix and compact samples in the lab
5. Analyze mix volumetrics (air voids, etc.)
6. Select the optimum asphalt content
7. Evaluate moisture susceptibility
CIVL 3137 4
Sample Size
SUPERPAVE
Marshall6"
4"4700 gAggregate 1200 g
Aggregate
CIVL 3137 5
Gyratory Compactor
CIVL 3137 6
Brovold Gyratory Compactor
CIVL 3137 7
Brovold Gyratory Compactor
CIVL 3137 8
Gyratory Compaction
= 1.25º
20 rpm
P = 600 kPa
CIVL 3137 9
Blend 1
Blend 2
Blend 3
NMAS = 19 mm
SuperpaveTM Level 1
CIVL 3137 10
NMAS(mm)
Aggregate Relative Density and Absorption
2.65 / 0.8% 2.65 / 1.6% 2.70 / 0.8% 2.70 / 1.6%
9.5 8.3 8.9 8.1 8.7
12.5 5.0 5.6 4.9 5.5
19 4.4 5.0 4.3 5.0
25 4.1 4.7 4.0 4.6
Same as Table 6‐12
SuperpaveTM Level 1
CIVL 3137 11
Same as Table 6‐13
Source: NCEES FE Supplied Reference Handbook
SuperpaveTM Level 1
CIVL 3137 12
(UPDATED VALUES)
< 0.30.3 to < 33 to < 3030 +
Source: ASTM D6925 ‐ 06
SuperpaveTM Level 1
CIVL 3137 13
Source: NCEES FE Supplied Reference Handbook
SuperpaveTM Level 1
CIVL 3137 14
AIR VOIDS (VTM) 11% 4% 2%
CIVL 3137 15
7 75
CIVL 3137 16
Mix Volumetrics(Taken from The Asphalt Institute Manual ES‐1, Second Edition)
Weigh in Air Weigh in Water
SuperpaveTM Level 1
CIVL 3137 17
b bP @4% P 0.4 4% AV
CIVL 3137 18
1
2
3
4
5
6
3.5 4.0 4.5 5.0 5.5 6.0 6.5
Asphalt Content (%)
Air V
oids (%
)
Marshall Mix Design
0.4
1
SuperpaveTM Level 1
CIVL 3137 19
1. Pb @4% + 1.0%
2. Pb @4% + 0.5%
3. Pb @4%
4. Pb @4% ‒ 0.5%
CIVL 3137 20
(Nini , Hini)
(Ndes , Hdes)
7 75 115
(Nmax , Hmax)
CIVL 3137 21
Mix Volumetrics(Taken from The Asphalt Institute Manual ES‐1, Second Edition)
Weigh in Air Weigh in Water
SuperpaveTM Level 1
CIVL 3137 22
in airmb max
SSD in water
mb maxmmn
mm n
mG RD@ N gyrations
m m
G HC 100% @ n gyrations%GG H
SuperpaveTM Level 1
CIVL 3137 23
Source: NCEES FE Supplied Reference Handbook
CIVL 3137 24
Asphalt Content Determination
Pb @4% + 1.0%Pb @4% + 0.5%Pb @4%Pb @4% ‒ 0.5%
CIVL 3137 25
Asphalt Content Determination
Pb @4% + 1.0%Pb @4% + 0.5%Pb @4%Pb @4% ‒ 0.5%
CIVL 3137 26