lessons learned on concrete pavement patching virginia concrete conference march 9, 2012 thomas r....
TRANSCRIPT
Lessons Learned on Concrete Pavement Patching
Virginia Concrete ConferenceMarch 9, 2012
Thomas R. Tate, P.E.
Senior Pavement Engineer
Hampton Roads District Materials
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Project Development
• Determine needed patch types• How to set patch limits• Establish accurate(?) quantities• Include patch locations• Traffic control, lane closure considerations (MOT)
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Project Development
In the beginning:• Identify (see) need• Identify project limits• Pavement evaluation• Scoping meeting• Develop contract
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Project Development
Identify (See) Need• Low pavement rating (low CCI)• Rough pavement• Failing joint sealant• Visible distresses• Poor maintenance history• Customer complaints
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Project Development
Identify Project Limits• Original construction project limits• Change in pavement type• Change in pavement width• Limit by physical boundaries• Set limits by funding
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Project Development
Pavement Evaluation, Why?• Determine existing pavement thicknesses (mainline,
shoulders, concrete thickness/type, base thickness/type, subgrade condition, etc.)
• Determine cause of observed distresses• Determine structural capacity of existing pavement
layers• Condition of bases• Condition of subgrade• Material reactions?• Drainage issues?
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Project Development
Scoping Meeting
Bring all stake holders together• Funding (Maintenance or Construction)• Materials• Design• Construction• Traffic Engineering• Structure & Bridge• Operations• Others
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Project Development
Develop Contract• Determine needed patch types• How to set patch limits• Establish accurate(?) quantities• Include patch locations• Traffic control, lane closure considerations (MOT)
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Project Development
Determine Needed Patch Types
Patch Type JCP CRCP
Type I X
Type II X
Type III X
Type IV X
Anchor Slab X
Approach Slab X X
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Project Development
Patch Limits
Jointed Concrete Pavement (JCP) Types I & II• Minimum 6 ft long• Full lane width (12 ft)• Minimum 1 ft past/beyond distress (failed joint, pot
hole, failed crack, etc.)• Minimum 1 ft past/off existing joint• Minimum 10 ft between patches
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Project Development
Patch Limits
Continuously Reinforced Concrete Pavement (CRCP) Type IV
• Minimum 6 ft long• Full lane width (12 ft)• Minimum 1 ft past/beyond distress (punch out,
asphalt patch, cluster cracks, Y-cracks, etc.)• Minimum 1 ft past/off existing transverse crack• Minimum 10 ft between patches• Headers?
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Project Development
Accurate Quantities• Patching• Joint Sealing• Crack Sealing• Slab Jacking• Shoulder Rehab• Traffic Items (Guardrail, Pavement Markings, etc.)
Know Limits of Work!!!!
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Project Development
Accurate Quantities
Patching – Estimating Quantities• Shoulder survey (walk or in vehicle)• Video survey• Sample survey• Others?
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Project Development
Severity level 2 cluster cracking – patch.
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Project Development
Severity level 1 cluster cracking
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Project Development
Accurate Quantities
Patching• Work will be done one or more years after estimated• What is purpose of patching?• Will the concrete pavement be left exposed or will it
be overlaid?• Expect quantities to increase from time of estimate
until pavement is actually patched (how many more winters will pavement go through?)
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Project Development
Patch Locations• Near other patches• Near bridges or overpasses• Near or within interchanges• At pavement changes
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Project Development
Traffic Control/Lane Closure Considerations• Limitations of Operations (LOO)• Will a waiver of standard LOO be needed• Is there other work going on or planned in general
vicinity of project?• Operations (Tunnels, Bridges, TOC)
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Project Development
Special Provisions or Copied Notes for:• Concrete Patching• Concrete Grinding• Re-Sealing Joints• Sealing Joints or Cracks• Rideability• Asphalt Work• XJ-1 Joints
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Project Development
Questions?