Surface Characteristics. MPPP November 13, 2013

Transcription

1 Surface Characteristics MPPP November 13, 2013 R OBERT O RTHMEYER, P.E. S ENIOR PAVEMENT ENGINEER PAVEMENT & MATERIALS TST R ESOURCE C ENTER O FFICE OF T ECHNICAL S ERVICES 1

2 Key Areas Friction / Texture Splash / Spray Noise Smoothness / Ride Quality 2

3 Pavement Friction Investigating most suitable equipment Working with States on data collection Develop Pavement Friction Management Programs with States High Friction Surface Treatments 3

4 FHWA Toolkit Friction/Texture Equipment loan program GripTester (2) Circular Texture Meter CTM (3) Dynamic Friction Tester DFT (3)

5 FHWA Toolkit Friction/Texture Equipment demonstration program Dynatest Highway Friction Tester: Continuous Friction Measurement Equipment (CFME) High Friction Surface Treatments 11 State Study EDC2 Deliverable

6 CFMEs CFME Continuous Friction Measuring Equipment Benefits Continuous measurement and reporting of friction values rather than spot measurement Measurement around curves and through intersections Fixed-slip devices better measure available friction, which better correlates to anti-lock braking Network-level and Project-level testing

7 Fixed Slip Friction Testing 14% slip (can be varied) Hydraulically Controlled Continuous Friction Testing Dynatest 6875H HFT Reports friction at 1 ft intervals Test left wheel path only (can be built for RWP) Texture Measurement Texture laser in-line with test wheel Reports MPD every 0.01 miles Water System 500 gal water tank (6875H); also available with 200 gal water tank on standard truck chassis Testing range ~27 miles (0.5 mm water film thickness)

8 Dynatest 6875H Test tire 2 Axis transducer Water nozzle Hydraulic fill and check plug Hydraulic pump Hydraulic lines

9 Splash / Spray Splash spray assessment tool development study - VTTI Development of a model to predict water film thickness and splash and spray occurrence on pavement surfaces Develop recommendations for threshold criteria to classify the impact of splash and spray on highway users. 9

10 FHWA Toolkit - Noise AASHTO Provisional Standard on Tire/Pavement Noise Measurement PP-76 using On Board Sound Intensity (OBSI) Developing two additional AAHSTO standards on pavement noise measurement TPF 5(135) Tire/Pavement Noise Research Consortium Develop lower cost OBSI system Conduct equipment demonstration rodeos

11 Performance Measure Defined - FHWA Performance measurement is the use of statistical evidence to determine progress toward specific defined organizational objectives. This includes both evidence of actual fact, such as measurement of pavement surface smoothness, and measurement of customer perception such as would be accomplished through a customer satisfaction survey. Last updated February 26,

12 Measurement of customer satisfaction FHWA conducted User Survey: 2002 Road condition cited as the public s number one criteria for satisfaction smoothness. Because of the public s focus on smoothness, any improvements made in both the initial and long term-term smoothness of a roadway should lead directly to greater customer satisfaction. 12

13 Pavement Smoothness Pavement smoothness is probably the single most important indicator of performance from the standpoint of the traveling public (CLIENTS). Goal(s): Develop and deploy standards to provide consistent, quality data. Collaboration: HQ, RC, HRDI, AASHTO SOM, ASTM, SHAs, Industry and Academia. Used Technical Working Groups for Ride Quality and started a Pooled Fund Study. 13

14 International Roughness Index (IRI)

15 Advantages of IRI Reproducible, portable and stable with time General pavement condition indicator Describes roughness that causes vehicle vibrations

16 IRI is highly correlated to: Vertical passenger acceleration (Ride Quality) Tire Contact (vehicle control and safety) Output from Response Type Roughness Measuring Systems

17 Properties of IRI Analysis IRI computed using quarter car model

18 Computation of IRI Need longitudinal profile containing information relevant to ride Computation of IRI performed by a computer program as specified in ASTM Standard E1926 Parameters of quarter car (e.g., spring stiffness, etc.) referred to as Golden Car parameters

19 Response of IRI to Wavelengths

20 Equipment Requirements for IRI Resolution of height sensor inch or less Sample interval must be less than 2 inches

21 Inertial Profiler Measuring Ride Quality

22 2007 Pavement Condition on the National Highway System (NHS) National Average = 56.7%, Target 57% in 2009 Good/Very Good (IRI of <95 /mile) > National Average > 1-10% below National Average > 10% below National Average 37.4% CA 70.5% OR 59.6% WA 65.9% NV 64.7% ID 53.5% UT 80.8% MT 66.8% WY 81.9% AZ 83.7% NM 45.5% CO 65.5% ND 62.0% SD 50.1% NE 79.6% KS 59.4% OK 57.0% MN 48.2% IA 73.2% MO 61.9% AR 48.6% WI 33.4% IL 62.5% IN 45.0% MI 84.1% TN 68.5% KY 76.5% OH 52.0% PA 69.4% WV 56.7% VA 67.8% SC 74.5% VT 57.7% NC 35.0% NY 69.1% NH 69.9% MD 66.2% ME 20.6% NJ 0.0% DC 74.2% MA 55.2% DE 51.0% RI 46.9% CT 43.6% TX 46.2% LA 59.9% MS 82.1% AL 94.2% GA 92.0% FL 53.1% AK 14.3% HI 3.1% PR Source: HPMS Compiled By: Office of Pavement Technology Federal Highway Administration March 2008

23 Developing new standards Used Expert Task Group (ETG) started 2000: consisted of industry, academia, SHA s & FHWA. Provisional Standards on ride quality by 2003 coordinated with AASHTO SOM Andy Mergenmeier (P&M TST). Full AASHTO Standards on ride quality by 2010 with focus on project level data collection. Revised ride standards in 2013 to include network level data collection: AASHTO R43, M328, R54, R56, R57; ASTM E

24 Pooled Fund Study TPF 5(063) Improving the Quality of Pavement Profiler Measurement kick off meeting 2003 Goal: To assemble states and the FHWA to: (1) identify data integrity and quality issues with inertial profilers; (2) suggest approaches to addressing identified problems; (3) initiate and monitor projects intended to address identified problems; (4) disseminate results; and (5) assist in solution deployment. 24

25 FHWA Toolkit Smoothness Profile Viewer and Analysis (ProVAL) software ( 10 workshops per year ASTM E : Standard Specification for Data Format for Pavement Profile NHI Pavement Smoothness AASHTO Ride Quality Standards Implementation Contract M328 Equipment Specification R54 Accepting Ride Quality using an inertial profiler R56 Certification of Inertial Profilers R57 Operating Inertial Profiler 25

26 Questions? Robert Orthmeyer FHWA Resource Center (708)