1. Data Collection for Determining Pavement Condition
Friction
Profile
Rut Depth
Structure
Distress identification

2. Friction Determination
Importance
Inadequate friction leads to higher number of crashes
Required to provide a safe road
Can be used to evaluate materials-AWI
Evaluated as
Locked Wheel
Spin Up Test
Surface Texture Measurement

3. Friction-Locked Wheel
ASTM 261
Standard Tire
Water on surface
40 MPH

4. Friction tester- Locked Wheel

5. Friction Tester Spin up
Wheel Lowered at 40 MPH
Friction force=torque/tire radius
f= Friction Force / Weight
Better then Locked Wheel as less equipment is required

6. Spin Up Friction Tester

7. Road Surface Analyzer A laser-based profiler using an accelerometer
established inertial reference.
ROSAN measures texture and longitudinal pavement profile at highway speeds.
Texture Analysis - Determination of Mean Profile
Depth Smoothness Analysis - 􀂾 Roughness Analysis - Determination of International
Roughness Index (IRI) & Ride Number (RN), using
ASTM E 950 & E 1926

8. Road Surface Analyzer

9. Rod and Level Dipstick profiler Road roughness Meter Profiling Devices
Roughness Measuring
Rod and Level
Dipstick profiler
Road roughness Meter
Profiling Devices

10. Roughness Measurement
Present Serviceability Rating (PSR)
Based on ride quality defined by observer
Values from 1-5
International Roughness Index
Based on Average Rectified Slope (ARS) determined from vehicle accumulated suspension motion divided by the distance m/km
IRI= 1000*ARS

11. Dipstick Analyzer
Operation The Dipstick Road Profiler stands on two support legs.  The operator simply "walks" the Dipstick along a survey line alternately pivoting the instrument about each leg. Two digital displays show the elevation difference between the Dipstick's two support legs. Audible and visual signals alert the operator when each elevation difference reading is measured and automatically recorded.  

12. Profilograph

13. Profiling Devices Straight Edges Low Speed Systems
Inertial Reference Systems
Can determine
Transverse Profile
Longitude Profile
Pavement Texture

14. Ames Engineering LISA

15. Laser RST Road Roughness Measurement

16. Rut Depth Uses many of the Standard Road Profilers
Uses transducers to measure differences in elevation between wheel paths and center of road

17. Rut Depth

18. Distress Surveys Automatic and Continous High Speed Digital Images
Used At Speeds Up to 60 MPG

19. Dynatest Video Distress Vehicle

20. Structural Evaluation
Falling Weight Deflectometers
Dynaflect Dynamic Force Generator
Benkleman Beam-Deflection Basin
Ground Penetrating Radar

21. Structural Test Falling Weight Deflectometer

22. Dynaflect Dynamic Deflection System

23. Benkleman Beam Ground Deflection

24. Roadscan Ground Penetrating Radar