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