Pavement Rehabilitation Selection Workshop
Transcript of Pavement Rehabilitation Selection Workshop
Sponsored by: APANM Brian Jones
Presented by: Dan Wegman, P.E.WEGS/Braun Intertec
CIR/FDR/SFDR Fundamentals
1. Background Information2. Definitions/Distress Identification3. Project Assessment and Rehab Selection4. Rehab Processes–CIR/FDR/SFDR &more5. Binder Selection6. Mix Design & Performance Testing7. Inspection
Workshop Outline
Background Information
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% 84.8
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1% 7.4%
6.5%
5.7%
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3.5%
3.2%
1.4%
1.0% 1.2%
0.7%
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1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
Interstate PL1 (Good) Interstate PL3 (Poor) Non-Interstate PL1 (Good) Non-Interstate PL3 (Poor)
PL-1 are pavements in "good" conditionPL-3 are pavements in "poor" conditionData Labels are for the noninterstate system
Rehab “Tool Box” Tools
• Cold in Place Recycling (CIR)• Cold Central Plant Recycling (CCPR)• Full Depth Reclamation (FDR)• Stabilized FDR (SFDR)• Hot in Place Recycling (HIR)
Full Depth Reclamation (FDR) Types of FDR (2007)
2%5% 6%
11%16%
20%
40%
0%5%
10%15%20%25%30%35%40%45%
Foam Fly Ash Other(Kiln dust
/CaCl2)Lime Emulsion Cement None
(dry)
Additives Used in Recycling
Pavement Life Cycle
Pavement Life Cycle
• Distress Identification• Project/Pavement Assessment• Binder Selection• Mix Design and Performance Testing• Inspection• Stacking Hands on Selection
BackgroundProcess Selection
• Surface Distress – Windshield Survey• Subsurface Distress – Coring & Boring• Drainage Related Distress• Environmental vs. Construction
Related • Performance Testing to address
common distress
Distress Identification
Pavement Surface Evaluations
Distresses can be attributed too:–Climate
• Transverse cracking• Block cracking
–Structural Deficiencies• Alligator cracking• Rutting
–Materials• Shoving• Bleeding
Pavement Condition/Distress Survey
Bituminous Pavement Distresses
Pavement AssessmentPavement Condition/Distress Survey
Fatigue (Alligator) Cracking Bleeding Block Cracking Corrugation and Shoving Depression Reflective Cracking Longitudinal Cracking Patching
Polished Aggregates Potholes Raveling Rutting Slippage Cracking Stripping Transverse (Thermal) Cracking Water Bleeding and Pumping
Bituminous Pavement Distresses
Pavement Surface Evaluations
Pavement Surface Evaluations
Pavement Surface Evaluations
Pavement AssessmentPavement Condition/Distress Survey
• How is pavement condition determined?– There are numerous resources available to assist in
conducting pavement condition surveys:• FHWA-SHRP• ASTM D5340-93• FP2 Electronic Guide• Corps of Engineers-Micropaver• Others ?
Pavement AssessmentPavement Condition/Distress Survey
• Procedures generally use a manual with detailed descriptions of:– Description of distress– Severity level and frequency– How to measure
Pavement Subsurface Evaluations
Goal is to determine what’s going on underneath the pavement surface.
Evaluation of inplace materials can be determined destructively (coring) or non-destructively (GPR, FWD):
–Identify underlying conditions (stripping?)–Identify thickness of inplace materials
Drainage, Drainage, Drainage ….
Pavement Assessment Surface and Subsurface Drainage Review
• Visual inspection for presence of:– Curb and gutter– Ditches– Subsurface drainage installed
• Is it working?
• Soil borings:– Base material type– Subgrade material type
Pavement Coring
• Confirm inplace materials and review conditions• Coring performed in non-cracked (sound)
pavement areas, as well as on cracks to assess extent of cracking.
Pavement Coring
Pavement Coring
Pavement Coring
Ground Penetrating Radar
Ground-coupled GPR
Air-coupled GPR
Primary Uses for Roadway GPR
Determining inplace thicknesseso Pre mill-and-overlay or cold in-place recycling
(CIR) thickness determinationo Bituminous and base thickness if considering full-
depth reclamation (FDR) Layer thicknesses for FWD Estimation of construction removal quantities QA testing following project completion
GPR Limitations
Weather• Need clear roads and pavement surfaces• No heavy rain (equipment damage and surface reflection of signal)
Noise/Interference• Common sources: FM radio and television towers, two-way radios
Depth • Typically can see to about 2 to 3 feet (Air Coupled)
Materials• Similar materials (such as sand-and-gravel base over silty-sand
subbase) may be difficult to differentiate• Materials that are intermixed
GPR for Pavements
Typical GPR Output File
Bituminous
Pavement Surface
Aggregate Base
Presentation of Data
Pavement Strength Evaluation
Evaluation of the structural capacity of an existing pavement can be determined by Falling Weight Deflectometer testing:
–Identify spring load capacity–Identify potential pavement failures–In-site R-value for use in pavement design–Design overlay thickness