may 2009 update on aashto rut&crack etg
TRANSCRIPT
ETG on Quantification of Pavement Cracking and Rutting
Proposed Standards for Measurement of Cracking and Rutting
May 2009
US Department of TransportationFederal Highway Administration
Why New Standards?1.Expiration of AASHTO Provisional Standards
PP-38 and PP-442.Development of newer technology3. Increasing need for precision and accuracy
Provisional Standard 38Now AASHTO Standard R 48-09
Proposed new Standards for Transverse Profile
1.Transverse Profile Measurement2.Transverse Profile Analysis
Data Standards -Transverse Profile Measurement
Scan Lane + 400 mm
≤10mm
Resolution within 1mm
Lane Line
±5° max
Transverse Profile
Transverse ProfileAnalysis
Centerof Lane
1. Calculate Cross-slope
CL
Roadway
Average elevationof right ½ lane
Average elevationof left ½ lane
Shoulder
Transverse ProfileAnalysis
Centerof Lane
1. Calculate Cross-slope
CL
Roadway
Average elevationof right ½ lane
Average elevationof left ½ lane
Shoulder
Transverse ProfileAnalysis
CL
1 2 3
2. Calculate Percent Deformation:
RoadShoulder
Transverse ProfileAnalysis
CL1
2
3
4
5
3. Calculate Rut Depths
RoadShoulder
Transverse ProfileAnalysis
3. Calculate Rut Depths
CL1
23
45
Roadway Shoulder
Transverse ProfileAnalysis
Centerof Lane
3. Calculate Rut Depths
CL
Roadway
12
3 4 5
Shoulder
Transverse ProfileAnalysis
4. Calculate Rut Area
CL1
2
3
4
5
Lane
Provisional Standard 44Expiring in 2009
Provisional Standard 44
Usual Lane Width 3.6 m
Pavement SurfaceSurvey Lane
Adjacent LaneShoulder ofAdjacent Lane
Lane
Lin
e
Lane
Lin
e
*Varies*Varies
Survey Strip2.500 m
InsideWP
OutsideWP
Areabetween
WPs
*Optional
0.125 0.125
0.75 0.75 0.75
0.125 m = 0.41 ft0.75 m = 2.5 ft3.6 m = 12 ft
Proposed Standard for measuring pavement cracking
• Image Characteristics• Detection Minimums• Reporting
Pavement cracking
4.0 m minimum4.25 m preferred
100 mMax.
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%
Proposed Standard for analyzing pavement cracking
• Uses 5 zones• Classifies into 3 types• Classifies by extent and severity
Pavement cracking
1 2 3 4 5Zones(Shoulder)
.75m .75m.875m .875m
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.
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
ETG Industry Members:
Gary Elkins, MACTECChuck Larson, STANTECFrank Holt, DynatestRichard Fox-Ivey, Fugro-RoadwareJerry Daleiden, FCLAU
ETG FHWA Members:
Thomas Van, HQ Asset ManagementJack Springer, TFHRCAndrew Mergenmeier, RCMike Moravec, HQ Pavements
For more information:
Thomas VanFHWA – Office of Asset ManagementTel. 202-366-1341Email: [email protected]
Rick MillerKansas DOT785-291-3842Email: [email protected]