Performance Guidelines for the Selection of Hot-Poured ...
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Performance Guidelines for theSelection of Hot-Poured BituminousCrack Sealants
Imad L. Al-QadiS-H YangEli Fini
J-F MassonKevin McGhee
NEPPP Meeting - November 4, 2009
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The 84th Annual Meeting of Association of Asphalt Paving Technologists, March 15 – 18, 2009, Minneapolis 2Crack SealantPerformance
Grade
SG-46 SG-52 SG-58 SG-64 SG-70 SG-76 SG-82
-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10
ApparentViscosity, Installation Temperature
SC-2Max. Viscosity
(Pa.s) 3.5
Min. Viscosity(Pa.s) 1
Vacuum Oven Residue (SC-3)
Dynamic Shear,46 52 58 64 70 76 82
SC-4Min. Flow
Coefficient(kPa.s)
4
Min. ShearThinning 0.7
Crack SealantBBR,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-5Max. Stiffness
(MPa) 25
Min. Avg. CreepRate 0.31
Crack SealantDTT,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-6Min. Extendibility
(%)
>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10
Crack SealantDBT,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-7
Min. Load (N) 50
Min. Energy(J/m2) 40
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Outline
• Introduction on Crack Sealants• Study Objectives• Study products/specifications
– Constructability– Accelerated aging– High temperature– Low temperature
• Preliminary field validation• Summary & Future Research
3
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• A material that possesses both adhesiveand cohesive properties to form a sealwhich prevents liquids and solids frompenetrating into the pavement system --ASTM D5535
• Crack sealant is formulated to keep itsshape as applied and hardens throughchemical and/or physical processes to forma viscoelastic, rubber-like material thatwithstands extension or compression andweathering
Crack Sealant
4
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5
Polymer-modifiedbitumen with a filler Polymer
Styrene-Butadienecopolymer (SBS)
Reduces thermalsusceptibility
Filler Ground tire rubber (GTR) Mineral filler Provides body and
improves wearing resist
A
500 m
AGTR
GTR
Crack Sealant
AB
AE
Low Polymer Content
High Polymer Content
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Crack Treatment Action
• Crack sealing/ filling is the most widely usedmaintenance activity of in-service pavements– Sealing – use for working crack– Filling – use for non-working crack
• Inexpensive, quick, and a well-proven techniqueto delay pavement deterioration– Reduces water penetration– Maintains pavement structural capacity– Improves road rideability– Extends pavement service life (2years↑)
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Crack Sealant Failure
• Failure Mode– Cohesion failure: fracture is evident within the
treatment– Adhesion failure: loss of bonding between the
treatment material and crack reservoir wall– Pullout: complete removal of a sealant sections from
the pavement• Superficial Distress
– Bubbling, extrusion, tracking, stone intrusion,weathering and wear
CohesiveFailure
AdhesiveFailurePullout
Failure IntrusionTracking
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8
Current ASTM SpecificationsSealant Property Test Method ASTM Spec.ApplicationCharacteristics Viscosity (binder) D4402
AdhesionBond Test
Asphalt CompatibilityD5329D5329
ExtensibilityElongation (rubber)
Ductility (binder)D412D113
Durability Track Abrasion (slurry) D3910
FlexibilityFlexibility
Cone PenetrationD5329D5329
TrackingFlow
Softening PointD5329
D36
Intrusion ResistanceResilience
Aged ResilienceD5329D5329
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Objective – Phase 1 Study
• Development of performance-basedguidelines for the selection of hot-poured crack sealant– Make use of SuperPave binder-testing
equipment
– Adapt the spirit of the binder PerformanceGrade (PG) specifications
– Place emphasis on fundamental properties thatrelate in a rational way to performance
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10
Crack Sealant Used in the Study
ID NotesCone Pen.
25°C(dmm)
Flow60°C(mm)
AgedResilience25°C (%)
Bond(P/F)
AsphaltComp.(P/F)
SofteningPoint(°C)
QQ Stiffest sealant 22 0 36 N/A P 220
ZZ San Antonio, TX 42 N/A N/A P N/A 212
AB San Antonio, TX 40 N/A 23 N/A N/A N/A
UU SHRP H106 62 1.5 N/A P N/A N/A
LL Virginia 68 2 50 P N/A N/A
NN Minnesota 75 0 70 P P N/A
AE NY, VA, and NH N/A N/A N/A N/A N/A N/A
PP Minnesota 130 1 44 P P N/A
A Montreal 86 0.5 57 F N/A N/A
B Montreal 68 0.5 64 P N/A N/A
E Montreal 124 1 73 P N/A N/A
G Montreal 50 0.5 51 F N/A N/A
J Montreal 66 6 48 P N/A N/A
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Crack Sealant Performance Tests
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Apparent Viscosity (SC-2)
Evaluate sealant constructability Test modifications and protocol
Rotational Viscometer (Brookfield) Rigid rod Melting time
20min Spindle size
SC-27 Speed
60rpm
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Apparent Viscosity (SC-2)
00.5
11.5
22.5
33.5
44.5
5
BB PPW
W UU EE AE ADMM VV QQ NN YY DD AB ZZ
Sealant
App
aren
t Vis
cosi
ty (P
a.s)
A minimum and maximum apparentviscosity of 1 and 3.5 Pa.s
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Vacuum Oven Aging (SC-3)
• Test method– Vacuum oven aging
• Test protocol– Place 30 ± 0.5g of sealant on a
PAV pan– Thickness of the sealant film ~
2mm– Apply 115°C in vacuum oven
for 16hrs
Simulates Crack Sealant Weathering inKettle & Field
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VOA (SC-3) - Verification
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
-40 -30 -20 -10 0 10 20 30 40Temperature, °C
Visc
osity
, Pa.
s
virgin 1 year9 year 16h24h 40h64h
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Dyn. Shear Rheom. (SC-4)
• High temperaturetracking resistance
• Correlate trackingflow with DSR
• Test protocol– Creep-recovery test– Apply 2s of shear
stress followed by18s of recovery
– Apply 8 levels ofstresses (25, 50,100, 200, 400, 800,1600, and 3200 Pa)
Year 1
Year 4
TimeSt
rain
Stress = 20Pa No stress: recovery
permanentdeformation
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Dyn. Shear Rheom. (SC-4)
• Performance parameters– Ostwald-DeWaele power-law
10
100
1000
10000
0.0001 0.01 1Shear rate, 1/s
Stre
ss, P
a
46C52C58C64C70C76C82C
PC )( C: flow coefficient P: shear thinning
exponent
A minimum flow coefficient of 4k Pa.s and a shearthinning exponent of 0.7
10
100
1000
10000
100000
0.4 0.5 0.6 0.7 0.8 0.9 1Shear thinning exponent (P)
Flow
coe
ffici
ent (
C)/
Pa.
s
no tracking1 sample tracks2 samples track
A
B
C
E
D
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Low Temperature Performance
• Bulk Properties– Flexural Properties
• Modified Bending Beam Rheometer (SC-5)– Extendibility
• Direct Tension Test (SC-6)
• Adhesion Properties– Work of Adhesion– Direct Adhesion Test (SC-7)– Blister Test (SC-8?)
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Bending Beam Rheom. (SC-5)
• Low Temperature Flexural Properties• Excessive softness of crack sealant
– Deflection of the sealant beam is above the limit of thecurrent BBR device
• Test modifications and protocol– Doubling the beam thickness– Modifying BBR device to be able to perform both
binder and sealant tests– Sealant beam dimension: 12.7x12.7x102mm– Apply 240s creep load follow by 480s of recovery
0
1
2
3
4
5
6
7
0 40 80 120 160 200 240Time
Def
lect
ion
(mm
)
0
300
600
900
Load
(mN
)DeflectionLoad
0
0.5
1
1.5
2
2.5
3
3.5
0 40 80 120 160 200 240Time (s)
Def
lect
ion
(mm
)
0
200
400
600
800
1000
1200
Load
(mN
)
DeflectionLoad
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 100 200 300 400 500 600 700Time (s)
Def
orm
atio
n (m
m)
0
200
400
600
800
1000
1200
Load
(N)
DeformationLoad
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Bending Beam Rheom. (SC-5)
• Performance parameter– Stiffness @ 240s
Average creep rate
( ) Ct At
3( )
4 ( )PLS t
bh t
0
0.1
0.2
0.3
0.4
0.5
QQ EE ZZ YY AB VV UU
DD AE
MM
WW NN AD PP BB
SealantA
vera
ge R
ate
of C
reep
2°C -4°C -10°C -16°C -22°C -28°C -34°C -40°C
0
5
10
15
20
25
30
35
40
45
50
QQ EE ZZ YY AB VV UU
DD AE
MM
WW NN AD PP BB
Sealant
Stiff
ness
(MPa
)
2°C -4°C -10°C -16°C -22°C -28°C -34°C -40°C
S(-10°C)=85MPa
A maximum stiffness of 25MPa and a minimumaverage creep rate of 0.31
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Direct Tension Test (SC-6)
• Low Temperature Extendibility• Simulates loading condition in the field• Test modifications and protocol
– Increase extension capacity• SuperPaveTM (33%) Crack Sealant (90+%)
– Specimen Dimension• 3mm (depth) x 24mm (length)
– Effective gauge length• Leff=20mm
– Loading rate• 0.02mm/s
• Yang et al. (2008)N/AN/A716Masson & Lacasse, 1999N/AN/A6+90Cook et al., 1991
5x10-58x10-3N/A63Linde, 19882.5
Min Crack(%)
5x10-3
Fast Move.(mm/min)
2.77x10-418Smith & Romine, 1993
Slow Move.(mm/min)
Max Crack(%)
Studies
N/AN/A716Masson & Lacasse, 1999N/AN/A6+90Cook et al., 1991
5x10-58x10-3N/A63Linde, 19882.5
Min Crack(%)
5x10-3
Fast Move.(mm/min)
2.77x10-418Smith & Romine, 1993
Slow Move.(mm/min)
Max Crack(%)
Studies
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• Performance parameter– Extendibility ( )
Direct Tension Test(SC-6)
eff
LL
The extendibility criterion based onvarious climatic conditions
T (°C) -4 -10 -16 -22 -28 -34 -40 (%) 10% 25% 40% 55% 70% 85% 85+
L = at breaking point= at max. deformation= at point (P2/P1<90%)
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Adhesion Test (SC-7)
• Low temperature adhesion property• Surface Energy Method (Work of
Adhesion)– A compatibility test for sealant producers
• Direct Bond Method– A quality control test for practitioners
• Blister Test Method– Fundamental test for advanced research
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The 84th Annual Meeting of Association of Asphalt Paving Technologists, March 15 – 18, 2009, Minneapolis 24
Work of Adhesion A fundamental property but not
conclusive characterization of interface Test method
Sessile Drop
(1 cos )totala sW
0
20
40
60
80
100
UU BB AE PP AD WW MM
Wor
k of
Adh
esio
n (m
J/m
2 )LimestoneQuartziteGraniteAluminum
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• Deformation rate controlledtest
• Test protocol– Two aluminum half-cylinders– Diameter
• 25mm– Sealant thickness
• 10mm– Displacement rate
• 0.05mm/s
• Specific failure location
Direct Bond Test (CS-7)
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0
40
80
120
160
Non-aged Oven-aged
Kettleaged
Less than3yr
More than3yr
Ener
gy (J
/m2 )
ABPPLL
0
50
100
150
200
Non-aged Oven-aged
Kettleaged
Less than3yr
More than3yr
P max
(N)
ABPPLL
Direct Bond Test Threshold
Performance Parameter Pmin De-bond Energy
A minimum load of 50N and a minimumde-bonding energy of 40J/m2
Energy
0
20
40
60
80
100
120
0 0.1 0.2 0.3 0.4 0.5 0.6Displacement (mm)
Load
(N)
P
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The 84th Annual Meeting of Association of Asphalt Paving Technologists, March 15 – 18, 2009, Minneapolis 27
Blister Test Displacement rate
controlled test Test protocol
Orifice size 25 mm
Sealant filmthickness 4.7mm
Displacement rate 0.12mm/s
Alcohol
LVD
T
)()()( tEtdtp
IFE= .p.d
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The 84th Annual Meeting of Association of Asphalt Paving Technologists, March 15 – 18, 2009, Minneapolis 28
Blister Test Parameter
0
100
200
300
400
2 -4 -10 -16 -22
IFE
(J/m
2 )
EEDDUUABQQ
Temperature (°C)
IFE
ini(J
/m2 )
0
200
400
600
800
1000
1200
-22 -34 -40
IFE
(J/m
2 )
ADBBPPNNLLAEMM
Temperature (°C)
IFE
ini(J
/m2 )
0.5 c cIFE p d Interfacial fracture energy
pc = peak pressure dc = blister height
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Field Validation (Limited)
• Year of installation– 1990
• Test site location– Montreal, Quebec, Canada
• Performance survey and field sample collection– At years 1, 3, 5, and 9
• Sealant Performance Index (PI)– PI = 100- (D+nP)
• PI = sealant performance index;• D = percent de-bonded length of the sealant;• P = percent pull-out length; and• n = an integral that accounts for the effect of pull- out over de-bonding on
performance.
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A B E G JPI (%) 33 74 72 8 39
0
10
20
30
40
50
60
70
80
Perf
orm
an
ce I
ndex
(%
)
Sealant Performance Index
A B E G JDe-bonding (%) 11 22 20 36 13Pull-out (%) 14 1 2 14 12
05
10152025303540
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Specification Comparison
Test Cone Penetration Flow Resilience BondResultTemp (C) (25°C) 60°C (25°C) (-29°C)
Criteria (<90 dmm)*, † (<3 mm)* (>60%)* (3 cycles)*A 86 0.5 57 F FailB 68 0.5 64 P Pass
E‡ 104 1 73 P FailG 50 0.5 51 F FailJ 66 6 48 P Fail
Test DSR CSBBR CSDTT CSAT
ResultPerformance Parameter C P S A. C. R. Max. P(kPa) (MPa) Rate (%) (N)
Criteria >4.0 >0.70 <25 >0.31 >85 >50Temp (C) 58 58 -34 -34 -34 -34
A 3.0 0.67 21 0.30 11 59 FailB 38.3 0.98 22 0.31 92 157 Pass
E 19.3 0.94 3 0.44 93No de-bond Pass
G 7.0 0.94 126 0.24 0.4 50 FailJ 7.6 0.94 602 0.16 0.7 N/A Fail
ASTM D 6690 Type II Test Specification
Sealant Performance Based Specification
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The 84th Annual Meeting of Association of Asphalt Paving Technologists, March 15 – 18, 2009, Minneapolis 32Crack SealantPerformance
Grade
SG-46 SG-52 SG-58 SG-64 SG-70 SG-76 SG-82
-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10-46-40-34-28-22-16-10
ApparentViscosity, Installation Temperature
SC-2Max. Viscosity
(Pa.s) 3.5
Min. Viscosity(Pa.s) 1
Vacuum Oven Residue (SC-3)
Dynamic Shear,46 52 58 64 70 76 82
SC-4Min. Flow
Coefficient(kPa.s)
4
Min. ShearThinning 0.7
Crack SealantBBR,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-5Max. Stiffness
(MPa) 25
Min. Avg. CreepRate 0.31
Crack SealantDTT,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-6Min. Extendibility
(%)
>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10>85>85>70>55>40>25>10
Crack SealantDBT,
-40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4 -40-34-28-22-16-10 -4
SC-7
Min. Load (N) 50
Min. Energy(J/m2) 40
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Summary (1)
• Comprehensive tests based on sealant rheologicalproperties was developed
• For pumping and sealing, apparent viscosity atinstallation temperature is recommended between 1and 3.5Pa.s– Brookfield Rotational Viscometer (un-aged material)
• For resistance to tracking at high servicetemperatures, a minimum flow coefficient of 4k Pa.sand a shear thinning exponent of 0.7 arerecommended– Dynamic Shear Rheometer (DSR)
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Summary (2)
• To withstand low-temperature conditions, a maximumS240s of 25MPa and a minimum average creep rate of0.31 are recommended– Modified BBR test (CSBBR)
For crack extension, a measurement of extendibilityover in-service temperature range is recommended
– Direct Tension Tester (CSDTT)
For appropriate sealant-crack wall bonding, aminimum load of 50N and debonding energy of40J/m2 at tested temperature are recommended
– Direct Adhesion Test
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AASHTO Protocols - Status
• Completed Tech Section (TS-4e) Ballot:– SC-2, Apparent Viscosity– SC-3, Sealant Aging– SC-5, Crack Sealant BBR– SC-6, Crack Sealant DTT– SC-7, Adhesion (DAT)
• Proceeding to concurrent Ballot (SOM):– SC-2, 3, 5, 6, 7– SC-8, Blister Test
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Recommended Future Work
• Laboratory validation• Field validation
– Monitoring test sections for four years– Fine-tune thresholds
• Quantify crack sealant cost effectiveness
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Acknowledgements
• Federal Highway Administration Pool-FundTPF - 5(045)
• The US-Canadian Crack SealantConsortium:– New Hampshire, Virginia, Connecticut, New York,
Minnesota, Texas, Washington D.C., Michigan,Georgia, Rhode Island, Maine, FHWA, City ofEdmonton, Greater Toronto Airport Authority, City ofToronto, Department of National Defense-Canada,Regional Municipality of Niagara, City of Calgary,Regional Municipality of Peel, Lafarge, Ministry ofTransportation of Ontario, City of Winnipeg, City ofOttawa, McAsphalt Industries Ltd.
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The rest of thestory? Go to:www.vtrc.net
Look for:VTRC 09-CR7
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Phase 2 – Validate & Implement
www.pooledfund.org- solicitation number 1233• Validation and Implementation of Hot-
Poured Crack Sealant Performance-Based Guidelines
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Phase 2 – Anticipated Tasks
• Task 1 – Lab Validation– Conduct round-robin tests to develop
precision and bias– Develop training program
• Task 2 – Field Validation– 8 test sections in four environmental regions– Two sealant types in each section
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Phase 2 – Anticipated Tasks
• Task 3 – Monitoring– Conduct regular field inspections– Collect sealant samples annually:
• Measure rheological properties to identify anychanges
– Monitor crack movement and temperaturevariation to provide insight into the selectionof the current temperature shift used in theproposed guidelines.
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Phase 2 – Anticipated Tasks
• Task 4: Fine-Tuning Threshold Values– Use field performance to fine-tune the testing
parameter thresholds in the proposedguidelines.
• Task 5: Quantify the Cost Effectivenessof Using Crack Sealants– Measure pavement condition annually, in
accordance with SHRP Distress Manual, toexamine the cost effectiveness of cracksealant.
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• Lead State and Contact:– Virginia, Kevin McGhee
• Partners (confirmed):– NH, NY, VA, WI, (MN?)
• Commitments:– Suggested - $25k/yr for four years– Required - $1,000,000 Total– Received - $325,000
• Solicitation Expires – 2/27/2010!!
43TPF Solicitation 1233
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