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

Data Collection for Determining Pavement Condition

bull Frictionbull Profilebull Rut Depthbull Structurebull Distress identification

Friction Determination

bull Importancendash Inadequate friction leads to higher number of

crashesndash Required to provide a safe roadndash Can be used to evaluate materials-AWIndash Evaluated asbull Locked Wheelbull Spin Up Testbull Surface Texture Measurement

Friction-Locked Wheel

bull ASTM 261ndash Standard Tirendash Water on surfacendash 40 MPH

Friction tester- Locked Wheel

Friction TesterSpin up

bull Wheel Lowered at 40 MPHndash Friction force=torquetire radiusndash f= Friction Force WeightBetter then Locked Wheel as less equipment is

required

Spin Up Friction Tester

Road Surface Analyzer

bull A laser-based profiler using an accelerometerbull established inertial referencebull ROSAN measures texture and longitudinal

pavement profile at highway speedsbull Texture Analysis - Determination of Mean Profilebull Depth Smoothness Analysis - 1048766 Roughness

Analysis - Determination of Internationalbull Roughness Index (IRI) amp Ride Number (RN) usingbull ASTM E 950 amp E 1926

Road Surface Analyzer

Roughness Measuring

Rod and LevelDipstick profilerRoad roughness MeterProfiling Devices

Roughness Measurement

bull Present Serviceability Rating (PSR)ndash Based on ride quality defined by observerndash Values from 1-5

bull International Roughness Indexndash Based on Average Rectified Slope (ARS)

determined from vehicle accumulated suspension motion divided by the distance mkm

ndash IRI= 1000ARS018( )5 IRIPSR e

Dipstick Analyzerbull 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 Dipsticks two support legs

Audible and visual signals alert the operator when each elevation difference reading is measured and automatically recorded

Profilograph

Profiling Devices

bull Straight Edgesbull Low Speed Systemsbull Inertial Reference Systemsbull Can determinendash Transverse Profilendash Longitude Profilendash Pavement Texture

Ames Engineering LISA

Laser RSTRoad Roughness Measurement

Rut Depth

bull Uses many of the Standard Road Profilersbull Uses transducers to measure differences in

elevation between wheel paths and center of road

Rut Depth

Distress Surveys

bull Automatic and Continousbull High Speed Digital Imagesbull Used At Speeds Up to 60 MPG

DynatestVideo Distress Vehicle

Structural Evaluation

bull Falling Weight Deflectometersbull Dynaflect Dynamic Force Generatorbull Benkleman Beam-Deflection Basinbull Ground Penetrating Radar

Structural TestFalling Weight Deflectometer

DynaflectDynamic Deflection System

Benkleman BeamGround Deflection

RoadscanGround Penetrating Radar