Integrating the Rolling Wheel Deflectometer (RWD) into Pavement Management to Support an Effective Pavement Preservation Program

Transcription

1 2014 Applied Research Associates, Inc. Integrating the Rolling Wheel Deflectometer (RWD) into Pavement Management to Support an Effective Pavement Preservation Program Curt A. Beckemeyer, P.E. Sr. Vice President Applied Research Associates, Inc. (ARA)

2 Presentation Outline Background Study Objectives and Purpose Data Collection Pavement Management Analysis Findings Conclusions New Developments 2016 Applied Research Associates, Inc. 2

3 System Laser-based system 18-kip, single-axle, dual-tire Operation Operates at posted speeds No lane closures Measurements The RWD Spatially-coincident method Averages deflections over 0.1-mile intervals 2016 Applied Research Associates, Inc. 3

4 Key Design Features Trailer Wheels Beam Lasers Calibration Software Laser between dual tires Reference beam and spot lasers 2016 Applied Research Associates, Inc. 4

5 Spatially Coincident Methodology Point 1 D 1 C 1 B 1 A 1 1 meter Anchors L D 2 C 2 B 2 A 2 Point 2 Anchors A 1, B 1 and C 1 establish the baseline for comparison to B 2, C 2 and D Applied Research Associates, Inc. 5

6 1,000s of lane-miles Dozens of lane-miles RWD Role in Pavement Management Network-Level Project-Level PQI Preservation FWD 8 7 IRI IRI, m/km Coring 1 Left WP Right WP Chainage RWD Rehabilitation or Reconstruction Lab 2016 Applied Research Associates, Inc. 6

7 Deflection, mils Sample Deflection Profile 35 RWD FWD AC (Fair) AC (Fair) AC (Good) AC (Good) 0 PCC PCC Station / Mile

8 FHWA Case Study - Oklahoma Evaluate the benefits of integrating RWD data into PMS Compare results with and without RWD data Treatment selection Costs Performance 2016 Applied Research Associates, Inc. 8

9 Test Network 1,000 miles (ODOT D-5) Primarily flexible pavements Wide range of functional classifications/traffic Data Collection Test Roads Continuous data collection Averaged data at 0.1-mile intervals Testing duration: 4.5 days 2016 Applied Research Associates, Inc. 9

10 Agency PMS Data Condition Pavement Quality Index (PQI): Ride quality Rutting Distress Composition / Use Pavement age Layer types and thicknesses Classification, traffic (ADT) Structural condition FWD data (interstate only) Structural rating (subjective) 2016 Applied Research Associates, Inc. 10

11 Agency PMS Methodology Software Deighton software (dtims) Performance Modeling Defined sectioning Performance models for each pavement type Decision Models Decision trees PQI, traffic, and structural condition 3 Treatment categories Preservation, rehab, replacement 2016 Applied Research Associates, Inc. 11

12 Evaluate multiple M&R treatment strategies Base strategy: PQI only Two modified strategies: add RWD data Compare results Approach Costs Performance (in terms of PQI) 2016 Applied Research Associates, Inc. 12

13 PQI PQI Only Treatment Matrix Low Traffic Medium Traffic High Traffic PRESERVATION REHABILITATION REPLACEMENT Applied Research Associates, Inc. 13

14 PQI RWD #1 Treatment Matrix PRESERVATION Traffic Low Medium High RWD L M H L M H L M H REHABILITATION 65 REPLACEMENT Applied Research Associates, Inc. 14

15 RWD #2 Treatment Matrix PRESERVATION Traffic Low Medium High RWD L M H L M H L M H REHABILITATION REPLACEMENT Applied Research Associates, Inc. 15

16 Results Budget Scenario Percent change in cost (relative to PQI Only base case) PQI Only RWD Option 1 RWD Option 2 Target PQI = % % % 2016 Applied Research Associates, Inc. 16

17 Conclusions RWD allows broader, more reliable use of pavement preservation Identifies roads in GOOD & FAIR structural condition Prevent PP use on roads in POOR structural condition Cost savings can be significant In the range of 5 to 10%, in many cases Depends on agency s current strategy and road conditions 2016 Applied Research Associates, Inc. 17

18 Recent Advancements in RWD Technology 2016 Applied Research Associates, Inc. 18

19 RWD-Vision (cameras vs lasers) LED Lights LED Lights Cameras Lights Between Tires 18-kip load

20 RWD-Vision, cont. Right Wheel Path - Laser RWD (old) Left Wheel Path RWD-Vision (new) High Speed LED based Flash 2 Camera Positions 2016 Applied Research Associates, Inc. 20

21 Basic Methodology Image 1 (undeflected pavement) Undeflected Region

22 Methodology, cont. Image 2 (same location as image 1, but under load) Undeflected area Deflected Region

23 96 inches Pixels Stereo-Pair Image Processing Pixels Inches 76 inches x RWD-Vision deflection measurements (in camera images) 29.2 in RWD-Vision deflection contour (on pavement surface) Area = 3.9 ft Applied Research Associates, Inc. RWD-Vision deflection profile along wheel path centerline 23

24 Maximum Deflection, mils Comparison with in-pavement Sensors RWD 1 RWD 2 RWD 3 Accels Station, feet 2016 Applied Research Associates, Inc. 24

25 Thank You!