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 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. MnROAD Office 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

◦ 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 3” PCC Overlay 7” PCC 5” CL 5 Clay Existing Cell Proposed Cell 7” PCC 5” CL 5 Clay Fabric UBOL – Low Vol RoadWhitetopping – Mainline 4” and 5” PCC 7” HMA Clay 4” and 5” PCC 7” HMA Clay Proposed Cell Existing 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) 7.5” PCC 4” RCA 3.5” CL 5 Clay 6.0” PCC 4” CL 1 3.5” CL 5 Clay Existing 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

 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

 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

 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 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