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COMPARISON OF RUTTING AND CRACKING PERFORMANCE ESTIMATES FOR
HVEEM AND SUPERPAVE MIX DESIGNS UTILIZING CALME
Erdem Coleri Assistant Professor
Oregon State University
94th Annual TRB Meeting, Washington D.C. January 13th, 2015
Prof. John Harvey, University of California, Davis (PI) Dr. James M. Signore, Nichols Consulting Engineers Venkata Lakshman Mandapaka, Caltrans Khushminder Singh Sahasi, Caltrans
Co-authors:
• Hypothesis tested: Since Superpave mix design produces higher binder
contents than Hveem mix design, Hveem mixes provide better rutting performance and worse cracking performance than Superpave mixes
• Use CalME to investigate the pros and cons of using
Hveem and Superpave mix design
RESEARCH OBJECTIVES
Caltrans is shifting the HMA design method from Hveem to Superpave.
OUTLINE
Background Materials Testing
CalME simulations
Conclusions
• Mix A, dense graded HMA (NMAS=3/4’’), conventional
PG 64-16 binder (Refinery 1), crushed alluvial aggregate
• Mix B, dense graded HMA (NMAS=3/4’’), conventional
PG 64-16 binder (Refinery 2), crushed basalt aggregate
• Mix I, gap-graded HMA (NMAS=1/2’’), rubberized binder
with PG64-16 base binder (Refinery 2), crushed basalt
aggregate
BACKGROUND Mix types
• Mix A, Hveem binder content = 5.0 %
Superpave binder content = 5.5 %
• Mix B, Hveem binder content = 5.2 %
Superpave binder content = 6.3 %
• Mix I, Hveem binder content = 8.0 %
Superpave binder content = 8.3 %
BACKGROUND Mix types – Binder contents
Testing Program
Rutting Repeated Simple Shear at Constant Height
100 kPa shear stress Temperature: 45 and 55oC
0
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0 5,000 10,000 15,000 20,000 25,000 30,000
Perm
anen
t She
ar S
trai
n
Cycles
5% PSS Failure Line
Test Results Rutting Repeated Simple Shear at Constant Height
Mix A
Mix B
Mix I
Testing Program
Cracking Stiffness Flexural fatigue Flexural frequency sweep
200 and 400 micro strain Temperature: 20oC
Temperature: 10, 20 and 30oC Various frequencies
Test Results Flexural fatigue
1,000
2,000
3,000
4,000
5,000
6,000
7,000
1,000 10,000 100,000 1,000,000 10,000,000
Flex
ural
Fat
igue
Stif
fnes
s (M
pa)
Cycles
200 MicrostrainMix A
Mix B
Mix I
Rutting performance evaluation
Factorial to evaluate Hveem vs. Superpave mix design methods
2 structures x 2 traffic levels x 3 climates x 3 mixes
Structures: Structure 1: 125mm thick AC layer on top of 300mm thick AB (Eab=250MPa) and a subgrade with 150MPa stiffness.
Structure 2: 175mm thick AC layer on top of 300mm thick AB (Eab=250MPa) and a subgrade with 150MPa stiffness.
Traffic: Traffic 1: Axles 1st year = 3M with a 5% growth rate
Traffic 2: Axles 1st year = 6M with a 5% growth rate
Climates: Inland Valley
High Desert
Low mountain
Mixes: Mix A; Mix B; Mix I
Rutting comparison Hveem vs. Superpave
0
2
4
6
8
10
12
14
16
18
20
0 2 4 6 8 10 12 14 16 18 20
Surface rut - Hveem
Surfa
ce ru
t - S
uper
pave
Surface rut (m
m)
(mm)
Rutting comparison Hveem vs. Superpave
Welch modified two sample t-test for surface rut predicted for Hveem and Superpave mixes
F1 and F2 are two distributions, the possible hypotheses and alternatives concerning these distributions are:
H0: F1(x) = F2(x) HA: F1(x) ≠ F2(x) Decision rule: Reject H0 if p-value < 0.10; accept H0 if
p-value ≥ 0.10
P-value = 0.09 for Hveem vs.Superpave
Predicted surface rutting for Hveem and Superpave mix design method are not equal. Superpave is higher.
0246
81012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
Rutting comparison Hveem vs. Superpave Surface rut for Mix A - Traffic level 1
02468
1012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
02468
1012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
High Desert – Thin AC High Desert – Thick AC Inland Valley – Thin AC
02468
1012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
02468
1012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0246
81012
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
Inland Valley – Thick AC Low mountain – Thin AC Low mountain – Thick AC
Rutting comparison Hveem vs. Superpave AC rut for Mix A - Traffic level 1
High Desert – Thin AC High Desert – Thick AC Inland Valley – Thin AC
Inland Valley – Thick AC Low mountain – Thin AC Low mountain – Thick AC
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
01234567
0 10 20 30 40 50Years
AC r
uttin
g (m
m)
SuperpaveHveem
Rutting comparison Hveem vs. Superpave Surface rut for Mix B - Traffic level 1
High Desert – Thin AC High Desert – Thick AC Inland Valley – Thin AC
Inland Valley – Thick AC Low mountain – Thin AC Low mountain – Thick AC
0
2
46
8
10
12
0 10 20 30 40 50YearsSu
rfac
e ru
ttin
g (m
m)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
Cracking of thin layered structures is causing third stage rutting accumulation.
Cracking performance evaluation
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25 30 35 40
Years to 0.5m/msq cracking - Hveem
Year
s to
0.5m
/msq
crac
king
- Sup
erpa
ve
Cracking comparison Hveem vs. Superpave Years to 0.5m/msq cracking – Mix A
3 CASES
Year 40 means no cracking larger than 0.5m/msq in 40 years
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25 30 35 40
Years to 0.5m/msq cracking - Hveem
Year
s to
0.5m
/msq
crac
king
- Sup
erpa
ve
Cracking comparison Hveem vs. Superpave Years to 0.5m/msq cracking – Mix B
Year 40 means no cracking larger than 0.5m/msq in 40 years
0
5
10
15
20
25
30
35
40
0 5 10 15 20 25 30 35 40
Years to 0.5m/msq cracking - Hveem
Year
s to
0.5m
/msq
crac
king
- Sup
erpa
ve
Cracking comparison Hveem vs. Superpave Years to 0.5m/msq cracking – Mix I
Year 40 means no cracking larger than 0.5m/msq in 40 years
Two cases to compare Hveem and Superpave:
1. Evaluate the reflection cracking resistance of thin Mix I (Rubber) layer on top of cracked PCC
2. Do thickness design for Hveem and Superpave
mix designs and answer the question: What is the cost of using Hveem and Superpave mix designs to achieve equal performance?
Superpave uses more binder but higher cracking performance reduces the material volume used for construction
1. 3.2M ESALS - 20 years (1) 2. High Desert; Low Mountain (2) 3. .
4. Hveem and Superpave (2)
24 cases x 1 (with reflection cracking) = 24 Cases
60 mm
125 and 175 mm Cracked PCC - 35,000MPa 3 mixes – Mix A; Mix B; Mix I
100 mm AB-Class2 - 200MPa
SG – CL - 100MPa
(6)
Crack and seat –Crack spacing 1.2m
Case 1:
Low Mountain
Structure 1 – Thin PCC - Hveem Structure 2 – Thick PCC - Hveem
Structure 1 – Thin PCC - Superpave Structure 2 – Thick PCC - Superpave
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
1. 2.5M ESALS - 20 years: TI10 & 40M ESALS – 20 years: TI14 (2) 2. Inland Valley (1) 3. .
4. Hveem and Superpave (2)
VARIABLE Mix A
150 mm AB-Class2 - 200MPa
SG – CL - 100MPa
(multiple)
Amount of binder required for Hveem and Superpave mix designs to achieve equal performance
Case 2:
0
1
2
3
4
5
6
7
8
9
10
156 158 160 162 164 166 168
Crac
king
at y
ear 2
0 (m
/msq
)
Thickness (mm)
TI10 - Hveem (103 mm)
0
1
2
3
4
5
6
7
8
9
10
98 100 102 104 106
Crac
king
at y
ear 2
0 (m
/msq
)
Thickness (mm)
Design criteria: Cracking at year 20 = 1.6m/msq
Rutting at year 20 = 4.8 mm
TI14 - Hveem (162 mm)
Rutting at year 20 = 5.7 mm
TI10 - Superpave (84 mm) TI14 - Superpave (122 mm)
0
1
2
3
4
5
6
7
8
9
80 82 84 86 88 90
Crac
king
at y
ear 2
0 (m
/msq
)
Thickness (mm)
Rutting at year 20 = 7.0 mm
0
1
2
3
4
5
6
7
8
118 120 122 124 126
Crac
king
at y
ear 2
0 (m
/msq
)
Thickness (mm)
Rutting at year 20 = 10.25 mm
Amount of binder used for Hveem and Superpave
TI 10 - Vmix (m3) TI 14 - Vmix (m3)
Hveem 555.30 873.39
Superpave 452.87 657.74
Design AC (%) TI 10 - Vbinder (m3) TI 14 - Vbinder (m3)
Hveem 5.00 27.77 43.67
Superpave 5.50 24.91 36.18
Volume of asphalt mix used for a 1 mile section for a 3.35m lane width
For TI 10 - The amount of binder required is 11.5 percent larger for the Hveem mix
For TI 14 - The amount of binder required is 20.7 percent larger for the Hveem mix
To get equal performance:
Conclusions Lower binder content for Hveem mix design results in
• better rutting performance • worse cracking performance
Difference in cracking resistance between Hveem and Superpave
mix designs is not significant for the rubber mix (Mix I)
For TI 10: The amount of binder required is 11.5 percent larger for the Hveem mix TI 14: The amount of binder required is 20.7 percent larger for the Hveem mix Superpave reduces cost for Mix A for the climate and traffic used in the simulations.
WHAT HAPPENS IF RUTTING IS THE CONTROLLING FACTOR FOR DESIGN?
FUTURE STUDY:
Thank you!
Q & A
http://www.ucprc.ucdavis.edu/
Results • Mix I (Rubber) – Hveem vs Superpave: Close performance • Mix A - Hveem vs Superpave: Superpave design~better perfor.
1,000
2,000
3,000
4,000
5,000
6,000
7,000
1,000 10,000 100,000 1,000,000 10,000,000
Flex
ural
Fat
igue
Stif
fnes
s (M
pa)
Cycles
200 Microstrain
1. 76M ESALS - 20 years (1) 2. High Desert; Inland Valley; Low Mountain (3)
3. Hveem and Superpave (2)
12 cases x 2 (with and without reflection cracking) = 24 Cases
60 mm
125 and 175 mm Mix A Mix I
100 mm AB-Class2 - 200MPa
SG – CL - 100MPa
(2)
Case 1:
With reflection cracking
Structure 1 – Thin DGAC - Hveem Structure 2 – Thick DGAC - Hveem
Structure 1 – Thin DGAC - Superpave Structure 2 – Thick DGAC - Superpave
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
Future research Superpave improved cracking performance and reduced the cost
WHEN CRACKING IS THE CONTROLLING DESIGN CRITERIA.
HVEEM mix design might be more cost effective WHEN RUTTING IS THE CONTROLLING DESIGN CRITERIA WARMER CLIMATES AND HEAVY LOADS
Rutting comparison Hveem vs. Superpave
Shift factor between predicted surface rutting for Hveem and Superpave mix design methods
0
2
4
6
8
10
12
14
16
18
20
0 2 4 6 8 10 12 14 16 18 20
Surface rut - Hveem (shifted)
Surfa
ce ru
t - S
uper
pave
Surface rutting predicted for Superpave mixes is 20% larger than rutting for Hveem mixes.
(mm
)
(mm)
0
2
4
6
8
0 2 4 6 8
AC layer rut - Hveem (shifted)
AC
laye
r rut
- Su
perp
ave
Rutting comparison Hveem vs. Superpave
Shift factor between predicted AC rutting for Hveem and Superpave mix design methods
AC layer rutting predicted for Superpave mixes is 56% larger than rutting for Hveem mixes.
(mm)
(mm
)
Rutting comparison Hveem vs. Superpave Surface rut for S410 – Mix B
0
2
4
6
8
10
12
14
16
18
0 2 4 6 8 10 12 14 16 18
Surface rut - Hveem
Surfa
ce ru
t - S
uper
pave
(mm
)
(mm)
Rutting comparison Hveem vs. Superpave
Shift factor between predicted surface rutting for Hveem and Superpave mix design methods
Surface rutting predicted for Superpave mixes is 42% larger than rutting for Hveem mixes.
0
2
4
6
8
10
12
14
16
18
0 2 4 6 8 10 12 14 16 18
Surface rut - Hveem (shifted)
Surfa
ce ru
t - S
uper
pave
(mm
)
(mm)
Cracking comparison Hveem vs. Superpave Surface cracking for all mixes
0
2
4
6
8
10
12
14
16
18
20
0 2 4 6 8 10 12 14 16 18 20
Cracking (m/msq) - Hveem
Crac
king
(m/m
sq)-
Supe
rpav
e
3 CASES
High Desert
Structure 1 – Thin PCC - Hveem Structure 2 – Thick PCC - Hveem
Structure 1 – Thin PCC - Superpave Structure 2 – Thick PCC - Superpave
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
0
1
2
3
4
5
0 10 20 30 40
Crac
king
, m /
msq
Years
P001-Mix AS311-Mix IS410-Mix B
Rutting comparison Hveem vs. Superpave AC rut for Mix A
0
2
4
6
8
0 2 4 6 8
AC layer rut - Hveem
AC
laye
r rut
- Su
perp
ave
(mm
)
(mm)
Rutting comparison Hveem vs. Superpave
Welch modified two sample t-test for AC rut predicted for Hveem and Superpave mixes
F1 and F2 are two distributions, the possible hypotheses and alternatives concerning these distributions are:
H0: F1(x) = F2(x) HA: F1(x) ≠ F2(x) Decision rule: Reject H0 if p-value < 0.10; accept H0 if
p-value ≥ 0.10
P-value = 0.05 for Hveem vs.Superpave
Predicted AC rutting for Hveem and Superpave mix design method are not equal. Superpave rutting is higher.
Without reflection cracking
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
Structure 1 – Thin DGAC - Hveem
-2
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
Structure 2 – Thick DGAC - Hveem
-2
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
Structure 1 – Thin DGAC - Superpave
-2
0
2
4
6
8
10
0 10 20 30 40
Crac
king
, m /
msq
Years
High DesertInland ValleyLow Mountain
Structure 2 – Thick DGAC - Superpave
Rutting comparison Hveem vs. Superpave Surface rut for Mix I - Traffic level 1
High Desert – Thin AC High Desert – Thick AC Inland Valley – Thin AC
Inland Valley – Thick AC Low mountain – Thin AC Low mountain – Thick AC
0
1
2
3
4
5
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50YearsSu
rfac
e ru
ttin
g (m
m)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
0
2
46
8
10
12
0 10 20 30 40 50Years
Surf
ace
rutt
ing
(mm
)
SuperpaveHveem
AC layer does not rut. All rutting is accumulated in the unbound layers.