A Look to the Future By: Pat Hughes, Dave Holt, and Ron Bumann.
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Transcript of A Look to the Future By: Pat Hughes, Dave Holt, and Ron Bumann.
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A Look to the Future
By: Pat Hughes,
Dave Holt, and
Ron Bumann
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Pavement Selection
A brief look at the Proposed Changes to thePavement Selection Process
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Pavement Selection refers to the process used by Mn/DOT to determine the surface type (asphalt or concrete) of major construction/reconstruction projects.
What is Pavement Selection?
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History of Pavement Selection
• Mn/DOT has had a formal procedure since 1959• Procedures were reviewed by Task Forces in
1977, 1981-1982 & 1995• Revisions were made in 1983, 1995, 1997 and
2001.• Current Task Force was appointed by Douglas
Weiszhaar, Mn/DOT Deputy Commissioner/Chief Engineer on August 23, 2002. Charge was to “fully evaluate” the existing process.
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Task Force Members• Mn/DOT Members
– Richard Stehr, Chair, Director of Engineering Services Division– Robert Winter, Director of District Operations Division– Patrick Hughes, District Engineer, Metro Division– Keith Shannon, Director of Office of Materials– Nelrae Succio, District Engineer, Rochester– Abby McKenzie, Director of Statewide Planning and Analysis Section– Joseph Meade, Manager of Pavement Engineering Section– David Van Deusen, Pavement Engineer
• Other Members– Jeff Blue, Waseca County Engineer– William Lohr, FHWA Division Pavement and Materials Engineer– David Levinson, University of Minnesota, Department of Civil Engineering– Mark Snyder, Executive Director, Concrete Paving Association of Minnesota– Richard Wolters, Executive Director, Minnesota Asphalt Pavement Association– Dave Holt, Executive Director, MAPA, Retired.
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Short Term RecommendationsShort Term Recommendations
• Service Life– Current Process = 35 years
– Proposed = 50 years
• Discount Rate– Current Process = 4.5%
– Proposed = Use 5-year running average of the Federal Office of Management and Budget real interest rate on a 30-year Treasury Note (for 2003 the rate is 3.5%).
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Short Term RecommendationsShort Term RecommendationsCategories
Rename the “Exempt” Category to the “District” Category for small projects (less than 2-miles long or 30,000 sq.yds). District will be required to do Life Cycle Cost Analysis but not held to the low cost option provided there is a good reason not to do so.
Unbonded concrete overlays will no longer be required to go through the Pavement Selection Process. They will be treated as a rehabilitation activity.
The Informal and Formal criteria will remain unchanged for the time being.
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Informal Bituminous Informal Concrete
FormalProcess
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Residual Value Current Process = Ignore Proposed = Credit the value of any remaining life for the
last rehabilitation.
Age
Pav
emen
t Q
ual
ity
Ind
ex
End of Analysis Period
ResidualValue
Short Term RecommendationsShort Term Recommendations
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Current Process Concrete: Joint reseal in year 17.5 Bituminous: Overlay in year 20
Recommended Process Use realistic timing and activities, including
preventive maintenance.
Have different strategies for bituminous roads with Low –vs- High Equivalent Standard Axle Loads.
Short Term RecommendationsShort Term Recommendations
Activity Timing
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Activity Timing:Bituminous Pavements, <= 7 Million BESALs
AGE ACTIVITY
0 Initial Construction
6 Seal Cracks
10 Surface Treatment
20 Mill & Overlay
23 Seal Cracks
27 Surface Treatment
35 Mill & Overlay
38 Seal Cracks
43 Surface Treatment
50 End of analysis period, no residual value
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Activity Timing:Bituminous Pavements, > 7 Million BESALs
AGE ACTIVITY
0 Initial Construction
7 Fill Cracks
15 Mill & Overlay
20 Fill Cracks
27 Mill & Overlay
32 Fill Cracks
40 Mill & Overlay
45 Fill Cracks
50 End of analysis period, no residual value
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Activity Timing:Concrete Pavements
AGE ACTIVITY
0 Initial Construction
17 Joint Reseal(some minor concrete pavement repair, partial depth)
27 Minor Concrete Pavement Repair(some full depth repairs)
40 Major Concrete Pavement Repair
50 End of analysis period (5-years of residual value)
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Activity Costs will be based on the median cost of
actual project costs built over the last 10-years.
Reduce the median cost by 10% to account for
today’s use of better quality materials and
improved specifications.
Adjust the activity costs by the difference
between highway construction and general
inflation rate, currently +0.21%.
Cost will be updated every year.
Short Term RecommendationsShort Term Recommendations
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Flexibility Current Process
If the District does not like the resulting low cost option they may request a meeting of the Pavement Selection Committee, although changes are extremely rare.
Recommended Process Omit the Pavement Selection Committee…any
variance from the low cost option must be approved by the Chief Engineer.
If an error is discovered or additional information becomes available that was not know initially, the district can request a new estimate.
Short Term RecommendationsShort Term Recommendations
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Long Term RecommendationsLong Term Recommendations
Use of Recycled Materials– Investigate the feasibility of incorporating salvage
aggregate into the cost estimate.
Formal/Informal Process– Have all projects go through the formal process for a
period of time once the new design guide is implemented and establish new criteria.
Aggregate Haul Distance– Investigate the current process, as well as alternatives
such as average bid prices and regional costs.
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Long Term RecommendationsLong Term RecommendationsUser Costs (currently not considered)
– Users costs, defined as user delay and increased vehicle operating costs incurred during the initial construction and subsequent maintenance & rehabilitation activities, will be calculated on projects over a 12-month period. Recommendations will then be made on how to incorporate them into the pavement selection process.
Pavement Design– Further discussions are needed after the new design guide is implemented to
see what the impact will be on the current standard designs used in pavement selection.
– Current Design – Based on historical performance
– Mechanistic Design – Based on mechanical properties of materials (stress/strain/deflection).
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Any Questions ?
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Thank You!
http://mnroad.dot.state.mn.us/
pavement/bituminous/
bituminous.asp