NDT Technology for QA of Flexible Pavement Construction Northeast Asphalt User/Producer Group Annual Meeting Mystic, Connecticut October 17, 2007

Transcription

1 NDT Technology for QA of Fleible Pavement Construction Northeast Asphalt User/Producer Group Annual Meeting Mystic, Connecticut October 17, 2007 Harold L. Von Quintus, P.E.

2 Presentation Outline 1. Overview Project 2. Candidate NDT Technologies 3. Unbound Materials/Soils 4. HMA Mitures 5. Recommendations from Study Sponsor: NCHRP Project Epanding the Realm of Possibility

3 Overview: The Team Principal Investigator Mr. H.L. Von Quintus ARA, Inc. Statistician Dr. Maghsoodloo NCAT Field Evaluations Dr. C. Rao, ARA, Inc. Dr. E. Minchin, UF Lab Testing Mr. B. Prowell NCAT Seismic Methods Dr. S. Nazarian UTEP FWD/LWD/DCP Mr. J. Mallela Mr. R. Stubstad ARA, Inc. GPR Dr. K. Maser Infrasense Epanding the Realm of Possibility

4 Overview: The Status Part A Confirm applicability of NDT test method Part B Improve/Revise test protocol & data interpretation procedures Laboratory Testing, Modulus Completed June 2005 Completed Fall 2006 Completed Summer 2007 Final Report Fall 2007 Epanding the Realm of Possibility

5 Overview: The Objectives 1. Conduct field evaluation of Potential NDT technologies; their effectiveness & practicality for QA. 2. Recommend test protocols for NDT technologies for QA programs for: Embankment Soils Aggregate Base Materials HMA Mitures = Practical & Effective tools for Routine use in QA Programs. Epanding the Realm of Possibility

6 Overview: Project Locations Number of materials within a project. Epanding the Realm of Possibility

7 Overview: The Hypotheses NDT Test Method: 1.Can identify localized anomalies. 2.Provides an accurate estimate of material-layer properties. 3. Provides an accurate measure of the mean & variance of lot. 4. Is insensitive to surface condition or teture of the surface. Epanding the Realm of Possibility

8 Presentation Outline 1. Overview Project 2. Candidate NDT Technologies 3. Unbound Materials/Soils 4. HMA Mitures 5. Recommendations from Study NCHRP Epanding the Realm of Possibility

9 NDT Technologies: Deflection-Based Methods Elastic Modulus Epanding the Realm of Possibility

10 NDT Technologies: Seismic-Based Methods Seismic & Resilient Modulus Epanding the Realm of Possibility

11 NDT Technologies Section 94A Section 94B Section 94C Section 98A Section 98B Section 98C Strength- Based Methods Elastic Modulus, ksi Average Depth, mm Penetration Rate & Resilient Modulus Epanding the Realm of Possibility

12 NDT Technologies Radar-Based Methods Depth (in.) Thickness & Volumetric Properties Depth (in.) Depth (in.) Distance from S Catch Basin (ft.) TH23 - Spicer, MN Layer 1 Dielectric, Line A Base Sections - Base Dielectric Layer 1 Dielectric, Line C GPS Stations Analyzed by: GLM Date: 10/21/04 Checked by: KRM Date: 10/22/04 INFRASENSE, Inc. Arlington, MA Sheet: 1 of 1 Epanding the Realm of Possibility

13 NDT Technologies Volumetric-Based Methods Epanding the Realm of Possibility

14 NDT Technologies Compaction-Response Based Methods Epanding the Realm of Possibility

15 NDT Technologies Ground Truth = Eisting QA Program Cores & Nuclear Gauge Readings Sand Cones & Nuclear Gauge Readings Epanding the Realm of Possibility

16 Presentation Outline 1. Overview Project 2. Candidate NDT Technologies 3. Unbound Materials/Soils 4. HMA Mitures 5. Recommendations from Study NCHRP Epanding the Realm of Possibility

17 Unbound Materials/Soils TH-23 Embankment Foundation SH-21 Subgrade TH-23 Crushed Aggregate Base SH-130 Improved Soil I-85 Embankment Fill US-280 Crushed Stone Base Epanding the Realm of Possibility

18 Testing Plan Unbound Material/Soils Section MALL Section 3 / North Section 2 / Middle Section 1 / South A B C A B C A B C NORTH SOUTH EXISTING TH 23 ROADWAY High moisture, low density Low moisture, high density Epanding the Realm of Possibility

19 Success Rates In Identifying Anomalies NDT Device Success Rate, % DSPA 86 GeoGauge 79 Dynamic Cone Penetrometer 64 Deflection-Based Devices 64 Ground Penetrating Radar 43 Non-Nuclear Density Gauge 36 Epanding the Realm of Possibility

20 Repeated Load Resilient Modulus Testing of Unbound Materials Confinement = 3 psi Confinement = 6 psi Confinement=10 psi Confinement = 15 psi Confinement = 20 psi Resilient Modulus, psi Bulk Stress, psi US-280 Crushed Stone Epanding the Realm of Possibility

21 Adjustment to Laboratory Conditions Select stress state from lab tests Use average NDT modulus in areas without anomalies Determine average ratio of NDT to lab resilient modulus Epanding the Realm of Possibility

22 Lab. Versus NDT Values; Adjusted to Lab Condition Adjusted Elastic Modulus from NDT Devices, ksi Adjusted Elastic Modulus from NDT Devices, ksi Geo., Fine-Grained Line of Equality DSPA, Coarse-Grained Geo., Coarse-Grained DSPA, Fine-Grained DCP, Fine-Grained Laboratory DCP, Coarse-Grained Resilient Modulus, Line ksi of Equality LWD, Fine-Grained LWD, Coarse-Grained Laboratory Resilient Modulus, ksi Epanding the Realm of Possibility

23 Lab. Versus Adjusted NDT Modulus Values NDT Device Mean Residual, ksi Standard Error, ksi GeoGauge DSPA DCP LWD Epanding the Realm of Possibility

24 Effect of Physical Changes on Seismic Modulus Sesimic Modulus, ksi Poly. (Sesimic Modulus, ksi) Dry Density, pcfi Poly. (Dry Density, pcfi) Dry Density, pcf Sesimic Modulus, ksi Moisture Content, I-85 Embankment, percent Epanding the Realm of Possibility

25 Modulus Growth Curves for Base Material; Lower Quality Base DCP GeoGauge Log. (GeoGauge) Log. (DCP) Resilient Modulus from NDT Devices, ksi Number of Roller Passes Epanding the Realm of Possibility

26 GeoGauge is Recommended; Why? Adequately identified anomalies. Adequately ranked the relative order of materials. Provides measure of resilient modulus. Output correlated to dry density. Coefficient of variation is less that other devices. Easily used to measure increasing resilient modulus with increasing compaction/density. Moisture content and density must be measured with other devices. Epanding the Realm of Possibility

27 Presentation Outline 1. Overview Project 2. Candidate NDT Technologies 3. Unbound Materials/Soils 4. HMA Mitures 5. Recommendations from Study NCHRP Epanding the Realm of Possibility

28 HMA Mitures US-280 HMA Base Supplemental Testing US-280 HMA Base Initial Testing TH-23 HMA Base SH-130 HMA Base I-85 SMA Overlay Epanding the Realm of Possibility

29 Testing Plan HMA Section IV Section 4 Tested on day of paving Low Asphalt Content A B C 5 III II 4 3 MALL 2 1 Section 1 to 3 Tested 1 day after paving I Epanding the Realm of Possibility

30 Success Rates for Identifying Anomalies NDT Devices Success Rate, % Portable Seismic Pav t. Analyzer 92 Non-Nuclear Gauge 77 Ground Penetrating Radar 50 Deflection-Based Device 50 Epanding the Realm of Possibility

31 Dynamic Modulus HMA Mies 0.1 HZ 0.5 HZ 1 HZ 5 HZ 10 HZ 25 HZ Dynamic Modulus, ksi Test Temperature, F US-280 HMA Base Miture; Initial Miture Epanding the Realm of Possibility

32 Adjustment to Laboratory Condition HMA Miture Dynamic E, ksi Adjustment Factor PSPA FWD SMA Overlay mm HMA Base Mi NA 19 mm HMA Base Mi NA 25 mm HMA Base Mi NA Epanding the Realm of Possibility

33 Lab Versus Adjusted NDT Modulus Values NDT Device PSPA FWD Mean Residual, ksi Standard Error, ksi Epanding the Realm of Possibility

34 HMA Miture Testing; Comparisons with IC Rollers Epanding the Realm of Possibility

35 PSPA is the Recommended NDT Device; Why? Provides measure of elastic or dynamic modulus. Adequately identified anomalies. Adequately ranked the relative order of materials. Elastic modulus correlated to HMA density. Can not be used to establish roller patter. Asphalt content & density measured with other devices. Epanding the Realm of Possibility

36 Presentation Outline 1. Overview Project 2. Candidate NDT Technologies 3. Unbound Materials/Soils 4. HMA Mitures 5. Study Recommendations NCHRP Epanding the Realm of Possibility

37 Recommended Devices Unbound Materials HMA Materials or Layers Epanding the Realm of Possibility

38 Summary of NDT Application to QA Programs QA Property Unbound Materials HMA Mitures Modulus GeoGauge PSPA Thickness GPR GPR Density Nuclear/Sand Cone 1 Cores/Nuclear 2 Non-Nuclear Fluids Content Oven Dry Ignition Oven Air Voids, Saturation --- GPR Epanding the Realm of Possibility

39 Acknowledgements: Minnesota DOT; Skiekmier & Bolland Dunnick Brothers, Mn. Alabama DOT; Fuller Scott Bridge Company East Alabama Paving NCAT, Prowell T. Turnpike Authority, Wade Avlis Engineering, Tam Humbolt, Fielder CarlBro/Fugro Dynatest Salut, Horan BOMAG, Connelly Catepillar Ammann, Fo N. Dakota Ohio DOT Michigan DOT Missouri DOT Epanding the Realm of Possibility

40 Thank you. Any Questions?