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National Concrete Consortium - September 15, 2015 NCC/07 McMullen Joint...What this presentation is...
Transcript of National Concrete Consortium - September 15, 2015 NCC/07 McMullen Joint...What this presentation is...
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National Concrete Consortium - September 15, 2015
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Welcome to Wisconsin !!!
Wisconsin Concrete Pavement Association
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Wisconsin Unsealed Joint Performance
National Concrete Consortium - September 15, 2015
Kevin W. McMullen, P.E.President
Wisconsin Concrete Pavement Association
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JOINT EFFORT
• What happened to Jim Parry?
National Concrete Consortium - September 15, 2015
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What this presentation is……
• A history lesson• Educational
National Concrete Consortium - September 15, 2015
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What this presentation is not…..
• An endorsement or promotion of a policy of sealing or not sealing
• WisDOT position• WCPA position
• Wisconsin urges you to research and make the proper decision for your individual state and/or agency
National Concrete Consortium - September 15, 2015
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HISTORY LESSON
National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
In the twenties hundreds of miles of concrete highway had been laid..., andpeople had sat back and said, “there,that’s permanent...”. But it wasn’t so ...and a crack developed and a little ice in the winter spread the crack, ...
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National Concrete Consortium - September 15, 2015
Then the county maintenance crews poured tar in the cracksto keep the water out,and that didn’t work, ...
John Steinbeck, 1947The Wayward Bus
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National Concrete Consortium - September 15, 2015
NATION
“From the ACPA Database”
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National Concrete Consortium - September 15, 2015
Joint Sealants
• Accepted definition:Sealants minimize infiltration of surface water & incompressibles into the joint system.
• Erroneous definition:Sealants prevent infiltration of surface water & incompressibles into the joint system.
History & Background
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Joint Sealants
• 1970’s brought change in expectations • Joint filler (old definition)
– Emphasis on incompressibles• Joint Sealants (current definition)
– Emphasis on water
History & Background
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0
10
20
30
40
50
None Hot-Pour Silicone Preformed
Current Sealant Use in Highways
4
50
2125
Perc
ent o
f Age
ncie
s
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Differential fromNo-seal
Relative toHot-pourSEALANT
None
Hot-pour
Silicone
Preformed
0%
+2.2%
+4.5%
+7.0%
97.8%
100.0%
102.3%
104.8%
Relative Cost of Sealants
Data from design features survey of contractors
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Performance of Sealants
Hot-pour
Silicone
Preformed
3-5 yr.
8-12 yr.
15-25 yr.
Roadways
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Predominate Joint Sealants forConcrete Highway Pavements
NoneHot-Pour SealantSilicone SealantPreformed Compression Seal
CRCP
CRCP
*
*
Illinois also regularly uses hot-poursin hinge joints.
All sealants are regularly used in Texas.*
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WISCONSIN
National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
Wisconsin No Joint Seal Policy
• History• Conclusions of the research• Update on performance• WisDOT Policy• WCPA Official Policy
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National Concrete Consortium - September 15, 2015
PCC JOINT SEALING
MUST ADDRESS THESE
CUSTOMER DRIVEN FACTORS
WisDOT Research on Joint SealingIndicated that:
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National Concrete Consortium - September 15, 2015
1. DOES JOINT SEALING ENHANCEPAVEMENT PERFORMANCE?
2. IF SO, IS IT COST EFFECTIVE?
3. IF SO, WHICH SEALANT / SYSTEM?
WHAT ARE THEIMPORTANT ISSUES?
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National Concrete Consortium - September 15, 2015
PAVEMENT PERFORMANCE
• DISTRESS PERFORMANCE
• RIDE (SUMMER / WINTER)
• MATERIALS INTEGRITY
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National Concrete Consortium - September 15, 2015
WisDOT expressed the opinion that: Research has gotten sidetracked on
the “How To’s” of Sealing, but the “Why do we Seal”
issues are ignored.
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National Concrete Consortium - September 15, 2015
1953-66 WIS built
several test areas
and evaluated them for
11-19 years
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National Concrete Consortium - September 15, 2015
In 1967, S.E. Hicks (Wis.) addressedHRB concerning 20 years of observations which clearly showedthe lack of benefits from joint sealing.He urged agencies to compare sealed test sections with unsealed control sections. The urgings on S.E. Hickswere ignored.
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National Concrete Consortium - September 15, 2015
CHALLENGING THE ACCEPTED
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National Concrete Consortium - September 15, 2015
Unproven Assumption:
You must keep water and
incompressibles out of the joint.
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National Concrete Consortium - September 15, 2015
USH 51 STUDY - JRCP
• Started in 1974• 22 test sections• 20’, 40’, 60’, 80’ Joint spacings• Sealed & Unsealed sections• Sandy Subgrade
• At 15 years of age, how were they performing?
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
Sealed Joint and 20 foot joint spacing
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National Concrete Consortium - September 15, 2015
Unsealed Joint and 20 foot joint spacing
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National Concrete Consortium - September 15, 2015
Sealed Joint at 80 foot joint spacing
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National Concrete Consortium - September 15, 2015
Unsealed Joint at 80 foot joint spacing
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
Joint Spalling – USH 51
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National Concrete Consortium - September 15, 2015
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1989 CONCLUSIONS
• Joint distress is significantly reduced as joint spacing is shortened
• Joint sealing– Does not improve ride or pavement distress– Does not increase life– Is not cost effective
• Implemented no seal policy
National Concrete Consortium - September 15, 2015
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Some additional work between 1989 and 1994
National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
VERIFICATION
Wisconsin results have been verified by: FHWA
Minnesota DOT
North Dakota DOT
WCPA
ACPA
ERES
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National Concrete Consortium - September 15, 2015
0
10
20
30
40
50
60
8 12 16 24
Joint Spacing, in meters
SealedUnsealed
PDI Ratings on USH 51 - - 21 raters from MN & ND (TS 8 omitted)
PDIWorse
Better
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National Concrete Consortium - September 15, 2015
INTERNATIONAL ROUGHNESS INDEXUSH 51 (AVG: NBL & SBL)
SUMMER
0
1
2
3
4
5
UNSEALED VARIOUS SEALANTS
IRI
UNSEALEDSEALED
Age: 21 yearsAVG IRI = 1.7 AVG IRI = 1.8
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National Concrete Consortium - September 15, 2015
INTERNATIONAL ROUGHNESS INDEXUSH 51 (AVG: NBL & SBL)
WINTER
0
1
2
3
4
5
UNSEALED VARIOUS SEALANTS
IRI
UNSEALEDSEALED
Age: 21 yearsAVG IRI = 2.1 AVG IRI = 2.1
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National Concrete Consortium - September 15, 2015
Materials Conclusion:
Joint Sealing has NOsignificant effect upon
materials integrity.
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National Concrete Consortium - September 15, 2015
Distress Conclusion:
Joint Sealing has NOsignificant effect upon
pavement distress or life.
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National Concrete Consortium - September 15, 2015
Ride Conclusion:
Joint Sealing has NO significant effect upon pavement ride
qualities.
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National Concrete Consortium - September 15, 2015
BRIDGE ENCROACHMENT
No change since adopting no-seal policy
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1995 WCPA Cost Assessment
National Concrete Consortium - September 15, 2015
Total Costs of Joint Sealing
Initial $2,800,000Maintenance $3,200,000Total $6,000,000 / yr
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National Concrete Consortium - September 15, 2015
Over the Years Wisconsin Evaluated: Doweled and Undoweled
Heavy and Light Traffic
Plain and Reinforced PCC
Heavy and Sandy Sails
Dense and OGBC
Bridge Encroachment
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
IRI – Other Research Test Sections
Highway Test Age
No. of Test Sections
IRISealedSummer
IRI SealedWinter
IRIUnsealedSummer
IRIUnsealed Winter
USH 18/151No dowels
10 5 Sealed2 Unsealed
2.01 2.17 1.97 2.01
USH 16No dowels
10 4 Sealed3 Unsealed
2.75 2.83 2.75 2.91
STH29Dowels and no dowels
6 2 Sealed2 Unsealed
1.49 1.31
AVERAGE 2.38 2.50 2.36 2.46
2000
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National Concrete Consortium - September 15, 2015
IRI – Other Research Test Sections
Highway Test Age
No. of Test Sections
IRISealed
IRI UnSealed
USH 18/151No dowels
18 5 Sealed2 Unsealed
1.77 1.09
USH 16/190No dowels
18 4 Sealed3 Unsealed
2.87 2.83
STH29Dowels and no dowels
14 2 Sealed2 Unsealed
1.63 1.67
2007
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National Concrete Consortium - September 15, 2015
TOTAL AGENCY PERSPECTIVE:
For 5 controlled studies: TOTAL PAVEMENT PERFORMANCE,
CUSTOMER CONVENIENCE and SAFETY
were NOT POSITIVELY influenced by Joint Sealing
(95% confidence level).
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National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
Best to Worst Performance
• Best – Unsealed Joints• Then – Sealed Joints• Worst – Partially Sealed Joints
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National Concrete Consortium - September 15, 2015
Partially Sealed Joint
Stress Concentrationover 5000 psi
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National Concrete Consortium - September 15, 2015
Unsealed Joint
Uniform Stress Distributionless than 2000 psi
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National Concrete Consortium - September 15, 2015
Location of Incompressibles
Depth ofConcrete
Incompressibles
Unsealed Jointno incompressibles nearthe top surface
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National Concrete Consortium - September 15, 2015
Maintenance Distress
OOOPPS!!!Guess I shoulda’ beenmore careful.
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National Concrete Consortium - September 15, 2015
WisDOT Policy
Narrow Unsealed, Sealed System,
CURRENT PRE-1990
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2004
National Concrete Consortium - September 15, 2015
0 5 10
3
4
5
AGE
PS
ISystem Wide Performance
'90 Unsealed Pavements
'89 Sealed Pavements
Pavement Ride
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2004
National Concrete Consortium - September 15, 2015
0 5 10
0
10
20
AGE
PD
ISystem Wide Performance
'90 Unsealed Pavements
'89 Sealed Pavements
Pavement Distress
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National Concrete Consortium - September 15, 2015
Current WisDOT Policy
• Single sawcut• One blade width• One third depth
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Evolving WisDOT Policyafter 25 years of no seal policy
• Rural highways – no change in policy– High speed– Shoulders and ditches– Traffic blows material off the roadway– Joints are essentially clear– No increased frequency of blowups– No increased frequency of bridge damage
National Concrete Consortium - September 15, 2015
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Evolving WisDOT Policyafter 25 years of no seal policy
• Urban highways and City streets –– Low speed– Curb and gutter– Sand and debris confined on the pavement– Joints are full of incompressibles– Frequency of joint distress– Increasing city requests to address the issue
National Concrete Consortium - September 15, 2015
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Evolving WisDOT Policyafter 25 years of no seal policy
• Urban highways and City streets –– Single saw cut– One blade width– One third depth– Fill with hot pour asphalt sealant
• To be implemented on all WisDOT work in 2016
• To be a participating cost on all local projects funded by WisDOT
National Concrete Consortium - September 15, 2015
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National Concrete Consortium - September 15, 2015
WCPA Official Policy
• Rural and high speed highways – Concur with WisDOT Policy
• Urban and low speed highways and streets – single sawcut and hot pour asphaltic joint filler
• Previously sealed pavements should have sealants replaced when rehabilitations are completed.
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National Concrete Consortium - September 15, 2015
QUESTIONS?