Michigan DOT Concrete Bus Tour August 13, 20008
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Transcript of Michigan DOT Concrete Bus Tour August 13, 20008
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Michigan DOT Concrete Bus TourAugust 13, 20008
Bill Miller, PE, Chief, Quality Assurance Division, West
Bureau of Construction and Materials
10th Annual Concrete Conference
January 27, 2009
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www.dot.state.pa.us
10th Annual Concrete Conference
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www.dot.state.pa.us
10th Annual Concrete Conference
Two Part Format• Presentation and discussion of projects (1
½ hours)
• Bus Tour of project sites (6 ½ hours)
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www.dot.state.pa.us
10th Annual Concrete Conference
Demonstration Projects (Performance Update)
• Dowel bar retrofit alignment verification study
• Deicer study effects on PCC (MichiganTech Transportation
Institute)
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Presentation and Discussion
Dowel bar retrofit alignment verification study
Device developed in Germany
Non-destructive quick method to check dowel bar alignments FHWA owns three MIT-Scan II devices can be borrowed through the Concrete Pavement Technology Program (CPTP)
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Deicer study of effects
• Determine Long Term Exposure to Magnesium Chloride, Calcium Chloride & Sodium Chloride
• Estimate Potential Reduction in Service Life
on PCC Pavement• Pavement
Performance was Significant Better with Ground Blast Furnace slag or Fly Ash in the Mix
• Sealants Improved Performance, Need to be Reapplied Every 3-5 Years
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Pavement Tour
• 4”-6” White-topping – intersections,
collector streets and ramps
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Pavement Tour
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Observations
White-topping projects• 4-6” deep, construction very similar to
PennDOT. • Intersection reconstruction is almost
entirely white topping and the connecting roadway.
• Rutting issue was eliminated. • Anticipating 20 year pavement life • tour projects in-place 4-10 years with
no performance issues.
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Pavements Tour
• 6.5” Concrete Overlays 4 lanes – high truck traffic
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Pavement Tour
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Observations
Concrete overlays • 6.5” depth unbonded, 1 ½” asphalt over existing
concrete• Minimal spall & joint repairs, only areas with base
failure• Transverse joint alignment is not required• Anticipating 25 year pavement life• Michigan is experiencing very good performance.
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Best Practices
• Warranty for materials and workmanship, all projects
• Alternate bidding – currently very limited bituminous bids
• Pavement committee reviews all design & construction changes
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Results
Significant Initiatives • Alternate Bidding Procedure
• Warranty Specification
• Pavement Preservation– Overlays
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THANK YOU