Automatic Pavement Cracking Distress Measurement System Bugao Xu

Зарегистрируйтесь, чтобы просмотреть полный документ!

Automatic Pavement Cracking Distress Measurement System Bugao Xu and Yaxiong Huang University of Texas at Austin bxu@mail. utexas. edu (512) 471 -7226 December 2004

Automated Pavement Distress Measurement Vehicle Digital Line Scan Camera

System Specifications • • One linescan camera: 2 k pixel, 37 k scan/sec One frame grabber: 4 taps, 40 MB each GSP: position and speed LED or halogen linear lighting device (patent pending) • Imaging Resolution: min 1. 786 mm per pixel • Image capturing and processing: Real-time • Network support

System Capabilities • • Real-time inspection Distance coverage: 100% Lane coverage: Up to 12 feet (3. 65 m) Vehicle speed: 3 -70 mile/hour (5 to 112 km/hour) Pavement type : flexible and rigid pavements Weather tolerance: cloudy or sunny Night operation: same as in daytime

System Output • • • Format: PMIS and ASSHTO protocols Summary data: at a given interval Crack map: continuous Snapshot: at an interval AVI images: saved up to one km Compressed images: continuous

System Performance • • • Repeatable over multiple runs: R 2>0. 8, CV 5. 0~14% Repeatable over testing speeds Repeatable under different cloud conditions Reproducible (vehicle to vehicle) Output data directly up-loadable input PMIS Measurements correlate well with manual ratings for flexible pavements

System Benefits • • • Safety (removing raters for roadway) Low cost compared to visual rating High data Quality Multiple data types with one pass of vehicle Easy data management

Continuous Crack Maps (40 ft) Unsealed Crack Sealed Crack

Asphalt Pavement Correlation of Multiple Scans 120 R 2 = 0. 9519 2 nd Scan 100 80 60 40 20 0 0 20 40 60 80 100 120 1 st Scan Longitudinal Crack on SL 360 R 1 432 to 436.

Multiple Scans Longitudinal Cracks on SL 360 R 1 432 to 436 Feet/station 300 #1 #2 #3 250 200 150 100 50 0 1 51 151 201 stations Transverse Cracks on SL 360 R 1 432 to 436 6. 0 Count/station 101 #1 #2 #3 4. 0 2. 0 0. 0 1 51 101 stations

Weather Conditions Longitudinal Crack on SL 360 R 1 432 to 436 300 200 May 8 (heavily cloudy) May 9 (sunny) 150 May 20 (cloudy) FeetStation 250 100 50 0 1 51 101 151 201 Stations Transverse Cracks on SL 360 R 1 432 to 436 CountStation 6. 0 4. 0 2. 0 0. 0 1 51 101 Stations 151 201

Vehicle Speeds Longitudinal Crack on SL 360 R 1 432 to 432+0. 5 FeetStation 200 35 mph 45 mph 55 mph 160 120 80 40 0 0 500 1000 1500 2000 Scanned Section (ft) 2500 3000 Transverse Cracks on SL 360 R 1 432 to 436 CountStation 3. 0 2. 0 1. 0 0 500 1000 1500 2000 Scanned Section (ft)

Long Distance Data (24 miles) 200 150 100 50 longitudinal crack 0 0. 0 1. 0 2. 0 3. 0 4. 0 5. 0 6. 0 7. 0 8. 0 9. 0 10. 0 11. 0 12. 0 13. 0 14. 0 15. 0 16. 0 17. 0 18. 0 19. 0 20. 0 21. 0 22. 0 23. 0 24. 0 200 150 100 50 0 8. 0 200 150 100 50 0 16. 0 Miles

Concrete Pavement Transverse (Vehicles 1 and 2)

Concrete Pavement Transverse Cracks Correlations of Different Runs (Transverse) Vehicle V 1 V 2 R 1 -R 2 0. 884 0. 963 R 1 -R 3 0. 960 0. 964 R 2 -R 3 0. 908 0. 966 Scan

Concrete Pavement Transverse Cracks (V 1 and V 2) Correlations R 1 0. 970 R 2 0. 897 R 3 0. 936

Concrete Pavement AASHTO Left Wheel Path (V 1)

Concrete Pavement AASHTO RWP (V 1)

Concrete Pavement AASHTO Between Wheel Path (V 1)

Concrete Pavement AASHTO Outside Wheel Path (V 1)

Concrete Pavement AASHTO Correlations (V 1) LWP RWP BWP OWP R 1 -R 2 0. 9564 0. 9071 0. 9390 0. 9701 R 1 -R 3 0. 9459 0. 8324 0. 9189 0. 9427 R 2 -R 3 0. 9215 0. 8263 0. 9201 0. 9293