Supporting Materials for NCHRP Report 626 (2009)

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NCHRP Project 10-65 Volume 3—Appendices for Research Report Nondestructive Testing Technology for Quality Control and Acceptance of Flexible Pavement Construction APPENDIX A TOPICS COVERED AND QUESTIONS USED DURING THE REVIEW OF NDT TECHNOLOGIES THAT HAVE BEEN USED BY DIFFERENT STATE AND FEDERAL AGENCIES Appendix A is a listing of the questions and topics that were used during the review of the different NDT technologies that have been used by state and federal agencies for evaluating, controlling, and accepting flexible pavement construction and HMA overlay placement. General Information and Expertise with NDT Methods 1. What types of NDT methods and devices have been used by the agency? a. Dynamic Cone Penetrometer b. Deflection-Based Methods c. Seismic d. Ultrasonic e. Density Measurement i. Bomag Asphalt Manager ii. PQI – Transtec iii. PaveTracker – Troxler iv. Humbolt Density Gauge f. Ground Penetrating Radar i. PERES II – Precision Electromagnetic Roadway Evaluation System; Lawrence Livermore National Laboratories ii. HERMES II g. MIT-Scan T h. Infrared i. Smoothness j. Skid k. Noise 2. For what purpose or application have they been used? a. Pavement forensic studies – limited use b. Pavement evaluation and rehabilitation design studies – routine use for design and evaluation c. Construction evaluation to identify or explain non-compliance d. Quality acceptance of HMA____ or unbound materials____ e. Quality control of HMA___ or unbound materials___ 3. How long have these NDT technologies and methods been used within the agency?

4. What comments does the agency have on the use of NDT methods for each specific purpose? a. Effectiveness of the NDT technology and equipment and analysis procedures b. Advantages of the NDT technology c. Disadvantages of the NDT technology 5. What is the operational cost of the equipment: a. Initial cost b. Maintenance requirements and costs c. Production rates of the equipment d. Time required for data analysis e. Complexity of the equipment and data acquisition system – software requirements and support f. Accuracy and repeatability of the equipment g. Calibration requirements NDT Protocols and Guidelines: 6. Has the agency prepared test protocols for the specific NDT devices used or has the agency developed test protocols or guidelines that are being used? 7. Does the agency have any repeatability data to determine the variability in the use of the equipment and methods? 8. Does the agency have criteria for interpretation of the data collected? NDT and Quality Assurance Procedures: If the NDT equipment has not been used for quality control and/or acceptance: 9. What is the agency’s opinion on the use of NDT for quality control and/or acceptance? 10. Does the agency believe that it can be used successfully at the present state of the art, or how do they believe that it can be used in a quality assurance plan? If the NDT equipment has been used for quality control and/or acceptance: 11. What properties have been measured? 12. What is the variability of the methods and equipment? a. Single operator variability b. Multi-operator variability c. General comment on its use in QA 13. How was the acceptance methods and criteria developed, and can a copy be obtained for use in NCHRP Project 10-65? Control Testing and Procedures: 14. What types of quality control tests are typically used by contractors within the organization for HMA and unbound materials and soils? a. Volumetric Properties i. Density/Air Voids ii. VMA iii. VFA

iv. Gradation v. Asphalt Content b. Structural Properties i. Thickness ii. Modulus (Dynamic and Resilient) iii. IDT Strength c. Functional Properties i. Surface Profile, Smoothness ii. Skid Resistance and Texture iii. Texture and noise 15. What procedure is used in the quality control process? a. Statistical Control Charts b. Run Charts c. Others Acceptance Testing and Procedures: 16. What types of tests and properties are used within your organization for HMA and unbound materials and soils? a. Volumetric Properties i. Density/Air Voids ii. VMA iii. VFA iv. Gradation v. Asphalt Content b. Structural Properties i. Thickness ii. Modulus (Dynamic and Resilient) iii. IDT Strength c. Functional Properties i. Surface Profile, Smoothness ii. Skid Resistance and Texture iii. Texture and noise 17. What type of procedure is used for acceptance? a. Percent Within Limits b. Absolute Average Deviation c. Others