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

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Presentation transcript:

Automatic Pavement Cracking Distress Measurement System Bugao Xu and Yaxiong Huang University of Texas at Austin (512) December 2004

Automated Pavement Distress Measurement Vehicle Digital Line Scan Camera

System Specifications One linescan camera: 2k pixel, 37k scan/sec One frame grabber: 4 taps, 40MB each GSP: position and speed LED or halogen linear lighting device (patent pending) Imaging Resolution: min 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 (40ft) Unsealed CrackSealed Crack

Asphalt Pavement Correlation of Multiple Scans Longitudinal Crack on SL360 R1 432 to 436. R 2 = st Scan 2 nd Scan

Multiple Scans Longitudinal Cracks on SL360 R1 432 to stations Feet/station #1 #2 #3 Transverse Cracks on SL360 R1 432 to stations Count/station #1 #2 #3

Weather Conditions Longitudinal Crack on SL360 R1 432 to Stations May 8 (heavily cloudy) May 9 (sunny) May 20 (cloudy) Feet\Station

Vehicle Speeds Transverse Cracks on SL360 R1 432 to 436 Count\Station Longitudinal Crack on SL360 R1 432 to Feet\Station Scanned Section (ft) 35 mph 45 mph 55 mph Scanned Section (ft)

Long Distance Data (24 miles) longitudinal crack Miles

Concrete Pavement Transverse (Vehicles 1 and 2)

Concrete Pavement Transverse Cracks Vehicle V1V2 R1-R R1-R R2-R Scan Correlations of Different Runs (Transverse)

Concrete Pavement Transverse Cracks (V1 and V2) R R R Correlations

Concrete Pavement AASHTO Left Wheel Path (V1)

Concrete Pavement AASHTO RWP (V1)

Concrete Pavement AASHTO Between Wheel Path (V1)

Concrete Pavement AASHTO Outside Wheel Path (V1)

Concrete Pavement AASHTO Correlations (V1) LWPRWPBWPOWP R1-R R1-R R2-R

Asphalt: Longitudinal Crack(2)

Asphalt: Longitudinal Crack (4)

Asphalt: Transverse Crack (1)

Asphalt: Transverse Crack (2)

Asphalt: Alligator Crack (2)

Asphalt: Alligator Crack (4)

Asphalt: Sealed Crack (2)

Asphalt: Sealed Crack (3)

Asphalt: Raveled Pavement

Asphalt: Patched Pavement

Asphalt: Dark Image (1)

Asphalt: Dark Image (2)

Asphalt: Bright & Fuzzy Image (1)

Asphalt: Bright & Fuzzy Image (2)

Concrete: No tinning (3)

Concrete: No tinning (4)

Concrete: No tinning (10)

Concrete: No tinning (11)

Concrete: Wide tinning (1)

Concrete: Wide tinning (2)

Concrete: Spalled (1) Spalled crack