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 MembersIndustry• Aggregate & Ready Mix Association of MN• American Concrete Pavement Association• Associated General Contractors of MN• Concrete Paving Association of MN• MN Asphalt Pavement Association• American Engineering Testing• Caterpillar Global Paving• Mathy Technology and Engineering
Services • RMC Research and Education
Foundation• Road Science• Braun Intertec• Flint Hills• Midstate Reclamation
National• Norwegian Public Roads Administration• United States Federal Highway Association
State and Local• Minnesota DOT• Minnesota Local Road Research
Board• Iowa DOT• Michigan DOT• New York State DOT• North Dakota DOT• Wisconsin DOT
University• Iowa State University• Michigan Tech University• University of Minnesota• National Center for Pavement
Preservation
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
Benefits of the TERRA Alliance
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
Initiatives
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.
MnROADOffice of Materials and Road Research
Low Volume Road
Mainline
Interstate 94
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
Phase 2 Implementation
◦ 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
Fiber Reinforced Concrete Overlays (2013)
3” PCC Overlay
7” PCC
5” CL 5
ClayExisting Cell Proposed Cell
7” PCC
5” CL 5
Clay
Fabric
UBOL – Low Vol Road Whitetopping – Mainline
4” and 5” PCC
7” HMA
Clay
4” and 5” PCC
7” HMA
ClayProposed CellExisting 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)
Fully Recycled Roadway – Sustainability
7.5” PCC
4” RCA
3.5” CL 5
Clay
6.0” PCC
4” CL 1
3.5” CL 5
ClayExisting Cell Proposed Cell
PCC Design Mainline (I-94) DOT Trial Mixing
Started Longitudinal Tined
Surface 13ft x 15ft Panels 1” Round Dowels Sealed Joints
Fabric/Grid
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
Rolling Resistance
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
Ground Penetrating Radar
Dialectric Plot – AC Density
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
Norwegian Exchange
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
Concrete Design Tools
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
Pavement Preservation
6” HMA+ 33” CL 4, 1993 Severe transverse & Longitudinal wheel
path 2006 Right lane:1½ inch mill & fill PG 52
– 34 IRI 126, 190
Micro Surfacing
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
Micro Surfacing June 2012
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
Results
Disc-shaped Compact Tension Test◦Fracture Energy Performance test – low temperature cracking, fatigue
Impact of binder grade, aggregate and recycled asphalt
Testing samples
Asphalt Performance Testing
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
Quiet Rumble Strips
Beginning to Plan for 2016 Working with Research Partners & Customers
Interested in your input
MnROAD Phase-III
Thank You
WWW.Pooledfund.org