proposed standards for measurement of cracking …...etg on quantification of pavement cracking and...
TRANSCRIPT
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ETG on Quantification of Pavement Cracking and Rutting
Proposed Standards for Measurement of Cracking and Rutting
May 2009
US Department of TransportationFederal Highway Administration
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Why New Standards?1.Expiration of AASHTO Provisional Standards
PP-38 and PP-442.Development of newer technology3. Increasing need for precision and accuracy
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Provisional Standard 38Now AASHTO Standard R 48-09
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Proposed new Standards for Transverse Profile
1.Transverse Profile Measurement2.Transverse Profile Analysis
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Data Standards -Transverse Profile Measurement
Scan Lane + 400 mm
≤10mm
Resolution within 1mm
Lane Line
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±5° max
Transverse Profile
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Transverse ProfileAnalysis
Centerof Lane
1. Calculate Cross-slope
CL
Roadway
Average elevationof right ½ lane
Average elevationof left ½ lane
Shoulder
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Transverse ProfileAnalysis
Centerof Lane
1. Calculate Cross-slope
CL
Roadway
Average elevationof right ½ lane
Average elevationof left ½ lane
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Transverse ProfileAnalysis
CL
1 2 3
2. Calculate Percent Deformation:
RoadShoulder
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Transverse ProfileAnalysis
CL1
2
3
4
5
3. Calculate Rut Depths
RoadShoulder
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Transverse ProfileAnalysis
3. Calculate Rut Depths
CL1
23
45
Roadway
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Transverse ProfileAnalysis
Centerof Lane
3. Calculate Rut Depths
CL
Roadway
12
3 4 5
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Transverse ProfileAnalysis
4. Calculate Rut Area
CL1
2
3
4
5
Lane
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Provisional Standard 44Expiring in 2009
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Provisional Standard 44
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Proposed Standard for measuring pavement cracking
• Image Characteristics• Detection Minimums• Reporting
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Pavement cracking
4.0 m minimum4.25 m preferred
100 mMax.
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Pavement crackingDetection Criteria:
Resolution ≤ 1 mmMin. Detection
• 30% if width is ≤ 3 mm • 50% if width is 3 mm to 5 mm• 85% if width is ≥ 5mm wide
False positives ≤ 3 m in 50 m2
Crack width within 20%
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Proposed Standard for analyzing pavement cracking
• Uses 5 zones• Classifies into 3 types• Classifies by extent and severity
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Pavement cracking
1 2 3 4 5Zones(Shoulder)
.75m .75m.875m .875m
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ETG Activities:1. Finalize R48 (5-point Rutting Method)2. Submit Proposals for Automated
Methods to AASHTO SOM Technical Committee 5a.
3. Conduct Verification Project4. Present Methodology to Pavement
Community.5. Work with AASHTO Committee to
finalize standards.
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ETG State Members:
Rick Miller, Kansas DOTJohn Andrews, Maryland DOTJeff Seiders, Texas DOTBouzid Choubane, Florida DOTCole Mullis, Oregon DOTJudith Corley-Lay, North Carolina DOTTodd Copenhaver, Texas DOT
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ETG Industry Members:
Gary Elkins, MACTECChuck Larson, STANTECFrank Holt, DynatestRichard Fox-Ivey, Fugro-RoadwareJerry Daleiden, FCLAU
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ETG FHWA Members:
Thomas Van, HQ Asset ManagementJack Springer, TFHRCAndrew Mergenmeier, RCMike Moravec, HQ Pavements
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For more information:
Thomas VanFHWA – Office of Asset ManagementTel. 202-366-1341Email: [email protected]