High-Speed Nondestructive Testing and Intelligent Construction Systems

Transcription

1 High-Speed Nondestructive Testing and Intelligent Construction Systems 1st International Conference on Transportation Construction Management February 9-11, Orlando, Florida Ted Ferragut, P.E.

2 NDT Testing Techniques What is NDT? Testing to detect defects in materials using techniques that do not damage or destroy the items being tested. (ultrandt.net) Why are we interested in NDT? High speed More coverage Less cost per test Less disruptive Safer to worker More permanent record

3 Why do we test a property? Specs say to Feds say to Auditors say to Need to know if it passes/fails Because we can NDT Testing Techniques To determine if product will perform as intended.

4 NDT Testing Techniques What can we use NDT for? Design, Construction, Performance Monitoring Bridges, Pavements, Earthwork, Tunnels, etc

5 NDT Testing Techniques Typical Non-destructive Testing Falling weight deflectometers Inertial Profilers Nuclear Density Gauges MIT-Scan Friction Profilographs Acoustic Emission

6 NDT Testing Techniques Typical Non-destructive Testing Ultrasonic testing Laser scanning Magnetic particle testing Crosshole Sonic Logging Rebound hammer Covermeter or pachometer Ground Penetrating Radar Infrared

7 Concrete Paving of the Future CP Road Map Tracks 12 Tracks Track 3 (ND) High-Speed Nondestructive Testing and Intelligent Construction Systems NEWS

8 CP Road Map ND Track Potential Performance Measures Temperature and moisture Thickness Dowel / tie bar / reinforcement alignment Curing application / effectiveness Workability Air void systems Mix density and volumetrics Stress / strength development Smoothness, texture, noise, friction Plant Transport Base Steel Paving Curing Saw/seal Acceptance Opening Goal Integrated Intelligent Concrete Mix and Paving System

9 Field Control Almost Ready Technology Stringless paving Real-time smoothness and texture monitoring Maturity/Temperature/SmartCure Advanced Quality Systems (AQS)

10 Stringless Paving GOMACO Iowa State University

11 Real Time Smoothness Monitoring GOMACO GOMACO

12 Real Time Smoothness and Accelerometers Texture Monitoring Texture Machine and Paver L4 L63 MPD Texture and Vibration Feedback LMI-Selcom RoLine Line Laser

13 Maturity for Real-Time Strength Monitoring

14 Real Time Curing Monitoring Warns of possible curing problems Measures and logs: Weather (temperature, wind, humidity) Fresh concrete temperatures Equipment location & speed Production rates FHWA SmartCure Enhances maturity testing for strength prediction

15 Real Time Curing Monitoring The parts: FHWA SmartCure

16 Legend: Bleeding Evaporation Time since placement 8:08 9:10 10:25 11:30 12:38 13: Critical Evaporation (kg/m2) : Critical Evaporation to % 5.2 mph 90%

17 Macrotexture Protocols RoboTex Texture Device Robotic Texture (RoboTex) built around LMI-Selcom RoLine line laser 3-D D texture profiling at 0.9 mm 0.45 mm sample interval Height sensor resolution is 0.01 mm (accuracy ~ 0.05 mm) Same line laser unit currently being evaluated by profiler vendors to help solve footprint issues

18 RoboTex Texture Device

19 RoboTex Texture Device

20 1/8" Deep Longitudinal 3/4" Spacing + Burlap (Long Section) dba 8 Longitudinal Texture Profile Transverse Texture Profile

21

22 Real Time Curing Monitoring FHWA SmartCure Monitors weather and concrete temperature Calculates evaporation rates Predicts set times Alerts of critical situation Logs position Use double coat of liquid curing compound

23 Real Time Curing Monitoring FHWA SmartCure

24 Real Time Curing Monitoring FHWA SmartCure.or without With a cure cart..

25 Intelligent Compaction of Base Layers

26 National Asphalt Road Map Intelligent Compaction Rollers Pavers with intelligent features GPS Nuclear Gauges for quality assurance IR Camera to detect segregation Automated truck sampling systems Global IRI (across the mat smoothness)

27 Real-Time Process Control Laydown and Compaction Real Time Measurement of: In-place Air Voids Mat Thickness Smoothness

28 IR Camera to Detect Segregation GOMACO Mn/DOT Mn/DOT

29 Intelligent Compaction Rollers HMA surface temperature GOMACO Roller passes

30 Intelligent Compaction Rollers Rolling pattern without IC GOMACO Rolling pattern with IC

31 Real-Time Process Control Asphalt Plant Operations Real Time Measurement of: Aggregate Gradation Asphalt Binder Content Volumetrics of the compacted plantproduced mixture Temperature of the HMA Moisture Content in the HMA

32 Non-Destructive Evaluation (NDE) for Process Control and Laser sensing technologies 3D Imaging QC/QA GPR to detect subsurface defects, voids, moisture FWD Penetrometers Non-nuclear Density Measurement IR Technology Seismic Technology Technologies identified by NCHRP 10-65

33 NDT Testing Techniques Needs for the Future Detecting Movement in Structures with Inertial Profile and Video Data Nondestructive Testing to Identity Delamination between HMA Layers Nondestructive Testing to Identify Bridge Deck Deterioration Continuous Deflection Sensors

34 NDT Testing Techniques Needs for the Future Field Spectroscopy devices to Fingerprint Construction Materials Strength Determination and Integrity Evaluation of Concrete pavement and Bridge Deck Repairs using Seismic Techniques Real Time Smoothness Measurements during PCC Pavement Construction

35 NDT Testing Techniques Evaluation Criteria Speed of measurement Low, medium, high speed testing. Impact on traffic. Lane closures Ease of measurement Skills required to measure characteristics Time from construction Elapsed time from product placement to test being available

36 NDT Testing Techniques Evaluation Criteria Time to process data Time from data collection to data availability and corrective action Procurement of services Contractor capabilities or specialized services from the DOT or private sector

37 NDT Testing Techniques Evaluation Criteria Technician skills required Technician taking tests requires special certifications Cost of measurements Dollars per test results weighed against other test techniques Repeatability and accuracy Impact on how many measurements to take

38 NDT Testing Techniques Evaluation Criteria Standardized measurement AASHTO, ASTM or other standard technique "Confidence Factor Confidence in numbers and techniques Referee Test Pass leads to acceptance; fail leads to re-test by another procedure

39 NDT Testing Techniques Benefits to Construction Managers Provide continuous and rapid feedback to operations and inspection forces Adjust operations to improve / enhance quality Reduce the number of inspectors / workers Improve efficiency and effectiveness Integrate construction data with materials management and pavement management systems

40 NDT Testing Techniques High-Speed NDT techniques and Intelligent Construction Systems are essential in a Rapid Renewal environment. Integrated ICS are critical for tracking the health of the pavement from cradle to grave to help identify causes of performance problems. Many technologies are ready to go, but there is still much more work needed to ensure robust technology and complete integration.