Mn/DOT Office of Materials and Road Researc Gene Skok (UofM) Gene Skok (UofM) Shongtao Dai (MnDOT) Shongtao Dai (MnDOT) 12 12 th th Minnesota Minnesota Pavement Conference Pavement Conference February 14, 2008 February 14, 2008 MnPavement Rehabilitation Best Practices LRRB Inv 808
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Mn/DOT Office of Materials and Road Research Gene Skok (UofM) Shongtao Dai (MnDOT) 12 th Minnesota Pavement Conference February 14, 2008 MnPavement Rehabilitation.
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ObjectivesObjectives Literature ReviewLiterature Review Types of ReclamationTypes of Reclamation Definition of FactorsDefinition of Factors Decision ChecklistsDecision Checklists CriteriaCriteria RecommendationsRecommendations
Pavement Pavement RehabilitationRehabilitation
(LRRB INV 808) (LRRB INV 808)
ObjectiveObjective
Laying out the Best Practices for the selection of asphalt concreterecycling techniques:• Full-Depth Reclamation (FDR) • Cold In-place Recycling (CIR) • Mill/Overlay (M&O).
Why Mill and Overlay ?Why Mill and Overlay ?
Low Initial CostLow Initial Cost Minimize clearance/grade issuesMinimize clearance/grade issues Construction time minimizedConstruction time minimized ““Covers”Covers” up reflective cracks up reflective cracks
ClearancesClearances Shoulder WidthShoulder Width Grading WidthGrading Width Curb and GutterCurb and Gutter ConstructabilityConstructability
GeometricsGeometrics
3.6 GEOMETRIC CONSIDERATIONS3.6 GEOMETRIC CONSIDERATIONS NOTE: Official State Aid rules can be found NOTE: Official State Aid rules can be found
directly at directly at http://http://www.revisor.leg.state.mn.us/bin/getpub.php?pubtwww.revisor.leg.state.mn.us/bin/getpub.php?pubtypeype==RULE_CHAP&yearRULE_CHAP&year==current&chaptercurrent&chapter=8820=8820
OR by browsing to OR by browsing to www.leg.state.mn.uswww.leg.state.mn.us and then and then selecting:selecting:
Statues, Session Laws, and RulesStatues, Session Laws, and Rules Under the “Minnesota Rules” section on the main Under the “Minnesota Rules” section on the main
page, “Retrieve an entire chapter”page, “Retrieve an entire chapter” Enter in the number “8820” and click “Get Enter in the number “8820” and click “Get
Table 3.6. Pavement Condition(s) ChecklistTable 3.6. Pavement Condition(s) ChecklistRide Quality Index (RQI)Ride Quality Index (RQI)
1.Methoda. ___________________1.Methoda. ___________________ Critical Value __________Critical Value __________1. Using Mn/DOT Van 2. Rating Panel1. Using Mn/DOT Van 2. Rating Panel
2. Rated by a panel2. Rated by a panelSurface Rating (SR)Surface Rating (SR)
1. Is existing HMA thickness adequate 1. Is existing HMA thickness adequate to support CIR equipment?to support CIR equipment?
(3.5 in.)?(3.5 in.)?
2. Is existing subgrade stiffness 2. Is existing subgrade stiffness adequate to support CIR equipment?adequate to support CIR equipment?
(5000 psi)?(5000 psi)?
3. Consider SR degradation rate.3. Consider SR degradation rate.
Criteria ContinuedCriteria Continued
4. If not structurally adequate then CIR should 4. If not structurally adequate then CIR should NOTNOT be used without additional overlay be used without additional overlay
5.If SR < 2.5 and IWD for multiple cracking or5.If SR < 2.5 and IWD for multiple cracking or
T.C. > 5.0:T.C. > 5.0:
- Mill and OL should not be used- Mill and OL should not be used
- if existing HMA > 3.5 in. use FDR or RIC- if existing HMA > 3.5 in. use FDR or RIC
- if existing HMA < 3.5 in. use FDR only - if existing HMA < 3.5 in. use FDR only
Criteria Continued moreCriteria Continued more
6. If the SR < 2.5 and Mult. or Transverse cracking 6. If the SR < 2.5 and Mult. or Transverse cracking IWD is < than 5.0, use mill & overlayIWD is < than 5.0, use mill & overlay
7. Finally, cost/benefits should be considered along 7. Finally, cost/benefits should be considered along with decay rates in the final decision.with decay rates in the final decision.
NOTE: T.C. IWD = 5.0 for a pavement with all NOTE: T.C. IWD = 5.0 for a pavement with all mediummedium severity T.C. represents a crack count of severity T.C. represents a crack count of 50 cracks per 100 ft.50 cracks per 100 ft.
An IWD = 5.0 for a pavement with all An IWD = 5.0 for a pavement with all high high severity T.C. represents a crack count of 25 severity T.C. represents a crack count of 25 cracks per 100 ft. cracks per 100 ft.
RECOMMENDATIONSRECOMMENDATIONS
Determine ride (RQI) periodically with Determine ride (RQI) periodically with Mn/DOT IRI correlation(s) or panelMn/DOT IRI correlation(s) or panel
Determine IWD and SR using Mn/DOT Determine IWD and SR using Mn/DOT Distress Manual periodicallyDistress Manual periodically
Run FWD periodically to determine:Run FWD periodically to determine:- TonnageTonnage- Subgrade StiffnessSubgrade Stiffness- GE of pavement sectionGE of pavement section
RECOMMENDATIONS (cont.)RECOMMENDATIONS (cont.)
4. Continue documenting performance 4. Continue documenting performance information from 1., 2., and 3. in the information from 1., 2., and 3. in the rehabilitation database (?)rehabilitation database (?)
- include RQI, SR (IWD’s), GE, Soil - include RQI, SR (IWD’s), GE, Soil Stiffness. This could be part of the Stiffness. This could be part of the PMS or Mn/ROAD database (s).PMS or Mn/ROAD database (s).
SummarySummary
Types of ReclamationTypes of Reclamation Decision FactorsDecision Factors Database DevelopmentDatabase Development Decision ChecklistsDecision Checklists CriteriaCriteria RecommendationsRecommendations
AcknowledgementsAcknowledgements
Minnesota Local Road Research BoardMinnesota Local Road Research Board Technical Advisory CommitteeTechnical Advisory Committee Mn/DOT, Dave Janisch, Erland Lukanen, Graig Mn/DOT, Dave Janisch, Erland Lukanen, Graig
Gilbertson,Perry CollinsGilbertson,Perry Collins Counties, Brian Noeltzman,Wayne Olson,Milt Counties, Brian Noeltzman,Wayne Olson,Milt
Hagen,Brad Wentz,Brian Shepard,Kathy Hagen,Brad Wentz,Brian Shepard,Kathy Jaschke,Darrell Pettis, Curt Bolles, Guy Jaschke,Darrell Pettis, Curt Bolles, Guy Kohnlhofer,Kohnlhofer,
Midwest Construction, Tom Olson,American Midwest Construction, Tom Olson,American Engineering, Dave Rettner, SEM Materials,Dan Engineering, Dave Rettner, SEM Materials,Dan Wegman, Wegman,
THANK YOU!, Any THANK YOU!, Any Questions?Questions?