Automatic Pavement Cracking Distress Measurement System
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Automatic Pavement Cracking Distress Measurement System Bugao Xu and Yaxiong Huang University of Texas at Austin [email protected] (512) 471-7226 December 2004
description
Automatic Pavement Cracking Distress Measurement System. Bugao Xu and Yaxiong Huang University of Texas at Austin [email protected] (512) 471-7226 December 2004. Automated Pavement Distress Measurement Vehicle. Digital Line Scan Camera. System Specifications. - PowerPoint PPT Presentation
Transcript of Automatic Pavement Cracking Distress Measurement System
Automatic Pavement Cracking Distress Measurement System
Bugao Xu and Yaxiong HuangUniversity of Texas at Austin
(512) 471-7226
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 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: R2>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 Crack Sealed Crack
Asphalt PavementCorrelation of Multiple Scans
Longitudinal Crack on SL360 R1 432 to 436.
R2 = 0.9519
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0 20 40 60 80 100 120
1st Scan
2nd S
can
Multiple ScansLongitudinal Cracks on SL360 R1 432 to 436
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1 51 101 151 201stations
Fee
t/st
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#1#2#3
Transverse Cracks on SL360 R1 432 to 436
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2.0
4.0
6.0
stations
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1 51 101 151 201
#1#2#3
Weather Conditions
Transverse Cracks on SL360 R1 432 to 436
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2.0
4.0
6.0
1 51 101 151 201
Stations
Count\Station
Longitudinal Crack on SL360 R1 432 to 436
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1 51 101 151 201
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 432+0.5
Feet\Station
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0 500 1000 1500 2000 2500 3000Scanned Section (ft)
35 mph45 mph55 mph
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Scanned Section (ft)0 500 1000 1500 2000 2500 3000
Long Distance Data (24 miles)
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lon
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8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0
Miles
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16.0 17.0 18.0 19.0 20.0 21.0 22.0 23.0 24.0
Concrete PavementTransverse (Vehicles 1 and 2)
020406080
100
1 5 9 13 17 21 25 29 33 37 41 45 49
0.1 Mile Segments
Tran
sver
se C
rack
#
V1
V2
Concrete Pavement Transverse Cracks
Vehicle V1 V2
R1-R2 0.884 0.963
R1-R3 0.960 0.964
R2-R3 0.908 0.966
ScanScan
Correlations of Different Runs Correlations of Different Runs (Transverse)(Transverse)
Concrete Pavement Transverse Cracks (V1 and V2)
R1 0.970
R2 0.897
R3 0.936
Correlations
Concrete Pavement AASHTO Left Wheel Path (V1)
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1 5 9 13 17 21 25 29 33 37 41 45 49
R1
R2
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Concrete Pavement AASHTO RWP (V1)
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1 5 9 13 17 21 25 29 33 37 41 45 49
R1
R2
R3
Concrete Pavement AASHTO Between Wheel Path (V1)
05
101520253035
1 5 9 13 17 21 25 29 33 37 41 45 49
R1
R2
R3
Concrete Pavement AASHTO Outside Wheel Path (V1)
0102030405060
1 5 9 13 17 21 25 29 33 37 41 45 49
R1
R2
R3
Concrete Pavement AASHTO Correlations (V1)
LWP RWP BWP OWPR1-R2 0.9564 0.9071 0.9390 0.9701
R1-R3 0.9459 0.8324 0.9189 0.9427
R2-R3 0.9215 0.8263 0.9201 0.9293
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
