MnDOT Road Research Update - Minnesota Department of
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Transcript MnDOT Road Research Update - Minnesota Department of
MnDOT Road Research
Update
Maureen Jensen
January 17, 2014
TERRA Vision
“A dynamic partnership of government,
industry, and academia that
continuously advances innovations in
road engineering and construction.”
Board Members
Industry
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State and Local
Aggregate & Ready Mix Association of MN • Minnesota DOT
American Concrete Pavement Association • Minnesota Local Road Research
Board
Associated General Contractors of MN
• Iowa DOT
Concrete Paving Association of MN
• Michigan DOT
MN Asphalt Pavement Association
• New York State DOT
American Engineering Testing
• North Dakota DOT
Caterpillar Global Paving
• Wisconsin DOT
Mathy Technology and Engineering
Services
University
RMC Research and Education
• Iowa State University
Foundation
• Michigan Tech University
Road Science
• University of Minnesota
Braun Intertec
• National Center for Pavement
Flint Hills
Preservation
Midstate Reclamation
National
• Norwegian Public Roads Administration
• United States Federal Highway Association
Benefits of the TERRA Alliance
Improved collaboration between public, private,
industry, and academic stakeholders
Capacity to anticipate future needs and trends
Research and Implementation partnership expansion
Leverage funds to meet common goals
Quicker adoption of innovations
Initiatives
Annual Pavement Conference being held in
conjunction with National Dust Control Conference
MnROAD 2016
Priorities, Partnerships
SHRP 2 Pavement Preservation Workshop
State Transportation Innovation Council
Funding to be managed by TERRA
Focus on Implementation
MnROAD
Office of Materials and Road Research
A long-term accelerated pavement
testing facility that gives researchers a
unique, real-life laboratory to study
and evaluate the performance of
materials used in roadway
construction.
Interstate 94
Low Volume Road
Mainline
Whitetopping Design Tool
Warm Mix Asphalt
Stabilized Full Depth Reclamation
Quiet Diamond Grind
Low Temperature Cracking Performance Test
Thin Concrete Overlays
Pervious Pavements for cold climates
Effect of Farm Vehicles on low volume roads
Recycled Unbound Bases
◦ Thinner, no dowels
◦ Larger Panels (6X6)
◦ UBOL: Use of fabric as the bond breaker
Thickness (thin vs thick) - Anchoring Method
Water Transport
◦ Whitetopping: Seal vs. No Seal
UBOL – Low Vol Road
Whitetopping – Mainline
3” PCC Overlay
Fabric
7” PCC
7” PCC
4” and 5” PCC
4” and 5” PCC
5” CL 5
5” CL 5
7” HMA
7” HMA
Clay
Clay
Clay
Clay
Existing Cell
Proposed Cell
Existing Cell
Proposed Cell
◦ Recycled concrete back into PCC mix (75% CA)
◦ Use of a Geotextile drain under joints (Tensar
Partnership)
◦ Thin neoprene joint sealants (DS Brown Partnership)
PCC Design
6.0” PCC
7.5” PCC
Fabric/Grid
4” CL 1
4” RCA
3.5” CL 5
3.5” CL 5
Clay
Clay
Existing Cell
Proposed Cell
Mainline (I-94)
DOT Trial Mixing
Started
Longitudinal Tined
Surface
13ft x 15ft Panels
1” Round Dowels
Sealed Joints
How does pavement texture, stiffness and
roughness effect fuel economy?
Measured RR in 2011 (MIRIAM device)
◦ over 20 concrete and asphalt surfaces
◦ Poor correlation to MPD
Working with FuelMiner on instrumented vehicle
for fuel use measurements
UC Davis (John Harvey) on model comparison,
validation, including Swedish VETO
Ground Penetrating Radar
Existing Equipment (single frequency)
◦ Asphalt Density
◦ Tie Bars
◦ Layer Thickness, consistency
New Step Frequency-GPR
◦ FHWA transferring to us
◦ Advantages
Wide detection range
Full coverage of a traffic lane in 2 passes at higher
speed
2-D and 3-D imaging capability
Continuous calibration
Norwegian Exchange
Anne Lelague – PhD. Student, spent 9 months in
Minnesota
Comparison of GPR tools and interpretations
Detection of ice lenses, frost heave
Tunnel Maintenance
Residual Salt Measurements
Benefits to MnDOT:
◦ Experience with 3D GPR
◦ Exposure to new potential uses
Whitetopping –final version delivered for
testing yesterday
Unbonded Overlays – pooled fund will
deliver tool by 2015
Concrete pavements- tool based on
MEPDG by end of the year
Optimal Timing of PM (pooled fund)
◦ Test to measure aging as it impacts performance
◦ Best to seal first year
Bio-Oils for fog seal, additive
◦ Field trial of product (TERRA – Bit Roadways)
◦ Research to determine how to evaluate and approve
National Workshop on Pavement Preservation
for high volume roads this September
◦ SHPR 2 funded
◦ September 2014 at MnROAD
6” HMA+ 33” CL 4, 1993
Severe transverse & Longitudinal wheel path
2006 Right lane:1½ inch mill & fill PG 52 – 34
IRI 126, 190
Goal:
Find a better “cheap
fix” for worn out
pavements
◦ Tack coat – Scratch Coat - Final surface
◦ Granite Type II
◦ 6 % Kraton polymer modified base asphalt
◦ Base PG 49-34 instead of PG 64-22
Immediately after construction
◦ Right lane 95 in/mi
◦ Left lane 96 in/mi
September 2012
◦ Right lane 100 in/mi
21% improvement in ride
◦ Left lane 99 in/mi
48% improvement in ride
September 2013
◦ Some Reflective Cracking
Disc-shaped
Compact Tension Test
◦ Fracture Energy Performance test –
low temperature cracking, fatigue
Impact
of binder grade, aggregate
and recycled asphalt
Testing samples
Became aware through these meetings, trip to
Norway
Public complaints about centerline, edgeline
rumble strip noise in certain locations
Installed at MnROAD, county and state roads for
testing
Local Road Research Board evaluating
Beginning to Plan for 2016
Working with Research Partners &
Customers
Interested in your input
WWW.Pooledfund.org