Recycling and Reclamation of Asphalt Pavements Using In-Place Methods (2011)

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51 APPENDIX A Agency and Contractor Survey NCHRP 40-13: Recycling and Reclamation of Asphalt Pavements Using In-Place Methods This survey is designed to collect key information needed to develop this synthesis. There are a total of 25 questions about various aspects of in-place recycling. The majority of the questions are “check the box” type. There are also opportunities for “essay” answers so that we can capture construction information and projects for developing case histories. Thank you for taking the time to contribute your valuable information to our database. When you click on the “Next Page” button, your answers up to that point will be saved. You can continue on with the survey or come back to it later and resume where you left off. If you have any questions, call Mary Stroup-Gardiner at (530) 898-6032 or e-mail at mstroup-gardiner@csuchico.edu 1) Contact Information Name ______________________________________________________________________________ Agency _____________________________________________________________________________ Address ____________________________________________________________________________ City ________________________________________________________________________________ State _______________________________________________________________________________ Zip Code ____________________________________________________________________________ Phone ______________________________________________________________________________ e-mail ______________________________________________________________________________ 2) Indicate how long you have been using each type of in-place recycling. Hot In-Place Cold In-Place Full Depth Reclamation Less than 5 years    5 to 10 years    More than 10 years    We don’t use this method    3) What types of hot in-place recycling do you use? (Check all that apply.) …… Remixing …… Repaving …… Surface heating 4) Indicate the extent of your annual recycling program in lane miles. Hot In-Place Cold In-Place Full Depth Reclamation Less than 50 lane miles    50 to 100 lane miles    More than 100 lane miles   

52 5) Traffic Levels: I would consider recycling a roadway with annual average daily traffic (AADT) levels of up to: Hot In-Place Cold In-Place Full Depth Reclamation 5,000 AADT    10,000 AADT    20,000 AADT    30,000 AADT    More than 30,000 AADT    6) Traffic Levels: Please indicate your reasons for limiting recycling to certain traffic levels. ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 7) Roadway Geometry and Existing Feature Constraints: I would consider recycling on roadways with: Hot In-Place Cold In-Place Full Depth Reclamation Tight turns (radius < 40 ft) or switchbacks    Mountainous terrains with grades exceeding 8%    Manholes or other castings within pavement layers    Minor roadway widening needs    Superelevation or cross-slope correction required    Curb and gutter    Other (use comment box)    8) Environmental Conditions: I would consider recycling on roadways in the following climate regions: Hot In-Place Cold In-Place Full Depth Reclamation Hot and Dry    Hot and Wet    Cold and Dry    Cold and Wet    Other   

53 9) Preconstruction Field Testing: Before construction, I typically use: Hot In-Place Cold In-Place Full Depth Reclamation Boring to check depth of base and HMA    Condition distress survey    Coring or milling to obtain material for lab testing    Coring to determine thickness    FWD testing    GPR testing    Ride quality (smoothness measurements)    Other    10) Preconstruction Laboratory Testing: Before construction, I typically determine: Hot In-Place Cold In-Place Full Depth Reclamation Aggregate gradations of cores or millings    Application rates of binders or other additives    Binder content of cores or millings    Material properties of any liquids, stabilizers, rejuvenators, additives, or admixtures to be added    Percent fines of millings    Recovered binder properties from cores or millings    Other    11) Cold In-Place: Indicate the types of liquids and stabilizers you use for your cold in-place recycling projects. Cold in-place: Types and grades of emulsions ______________________________________________ Cold in-place: Stabilizers ______________________________________________________________ Cold in-place: Rejuvenators ____________________________________________________________ Cold in-place: Admixtures _____________________________________________________________ Cold in-place: Corrective aggregates _____________________________________________________ Cold in-place: Any other additives _______________________________________________________ 12) Hot In-Place: Indicate the types of liquids and stabilizers you use for your hot in-place recycling projects. Hot in-place: Types and grades of emulsions _______________________________________________ Hot in-place: Stabilizers _______________________________________________________________ Hot in-place: Rejuvenators _____________________________________________________________ Hot in-place: Admixtures ______________________________________________________________ Hot in-place: Corrective aggregates ______________________________________________________ Hot in-place: Any other additives _______________________________________________________ 13) Full Depth Reclamation: Indicate the types of liquids and stabilizers you use for your full depth reclamation recycling projects. Full depth reclamation: Types and grades of emulsions _____________________________________ Full depth reclamation: Stabilizers ______________________________________________________ Full depth reclamation: Rejuvenators ____________________________________________________

54 Full depth reclamation: Admixtures ____________________________________________________ Full depth reclamation: Corrective aggregates ____________________________________________ Full depth reclamation: Any other additives ______________________________________________ 14) Mix Design Testing: Before construction, I or my contractor design our recycled mixes based on the following method: Hot In-Place Cold In-Place Full Depth Reclamation Don’t do formal mix designs    Hveem mix design    Marshall mix design    Superpave gyratory compactor    Wirtgen mix design    Other    15) Structural Design: During project development, I consider the structural capacity of the recycled layer using: Hot In-Place Cold In-Place Full Depth Reclamation FWD testing    Laboratory resilient modulus    Established structural coefficients    Predetermined layer thickness from experience    Other    16) Equipment: For hot in-place recycling, what types of preheaters do you allow? …… Infra-red …… Open flame …… Recirculating heated gases …… Combination of above 17) Typical Milling Depth: Indicate the most common depth of milling for your recycling projects. Hot In-Place Cold In-Place Full Depth Reclamation 1 to 2 inches    2 to 4 inches    4 to 6 inches    Greater than 6 inches    Other   

55 18) Construction: Indicate the number of people on the construction site for a typical project. The estimated number of people should include truck drivers, equipment operators, inspectors, supervisors, road crew, and traffic control people. Hot In-Place Cold In-Place Full Depth Reclamation Less than 5    5 to 7    8 to 10    More than 10    19) Surface Treatment: Indicate the typical top layer used for recycling projects. Hot In-Place Cold In-Place Full Depth Reclamation Fog and chip seal    Fog seal only    HMA overlay (structural)    Integral HMA overlay    Microsurfacing    OGFC    Other thin HMA overlay (non-structural)    Slurry seal    Other    20) Surface Treatment: What criteria do you use to select the surface treatment? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 21) Surface Treatment: Does your selection of the surface treatment depend on the climatic region of the project? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 22) Quality Control: Briefly indicate your current quality control programs and/or practices. ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 23) Quality Assurance: Briefly indicate your current quality assurance programs and/or practices. What types of acceptance testing do you specify? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________

56 24) Performance Measures: What performance measures would you recommend for evaluating the quality of in-place recycled pavements? (e.g., 50% immediate improvement in smoothness). ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 25) Specifications: What type of specifications does your agency use? Hot In-Place Cold In-Place Full Depth Reclamation Method specification    End result specification    Performance specification    Warranty    Other    26) Warranty: Does your agency specify a warranty period for the different in-situ recycling processes? If so, what is the length of the warranty and what type of assurance is required? ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 27) Contracting: Does your agency specify an alternate bid for the in-place recycling process? Please specify the alternate design for the specific in-place recycling treatment. ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 28) Barriers to Implementation: Indicate all of the factors you think are likely to limit the use of recycled pavements. …… Lack of engineering design procedures. …… Lack of standard specifications. …… Lack of mix design methods. …… Lack of project selection criteria. …… Lack of experienced local contractors. …… Lack of agency experience. …… Previous unsuccessful experiences. …… Opposition from competing industries. …… Other (please specify): If you selected other, please specify ______________________________________________________ ___________________________________________________________________________________

57 29) Environmental Benefits: Indicate environmental benefits, which you have documented on your projects. …… Reduced use of virgin materials. …… Reduced time for lane closures. …… Reduced fuel consumption. …… Reduced emissions. …… Other (please specify): If you selected other, please specify _______________________________________________________ ___________________________________________________________________________________ 30) Environmental Benefits: Can you quantify these environmental benefits? If so, please provide a summary of these quantified benefits. ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ 31) Case Study Information—Examples of best practices or, just as important, lessons learned: Do you have or do you know of any recycling projects that could be used in case studies? If so, please provide information on the project name, and contact name and number. ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________