NCHRP 9-58: Recycling Agents Suppliers Web-Based Survey Step 1 of 6 16% Web‐Based Survey Introduction You are invited to complete an online survey as part of National Cooperative Highway Research Program (NCHRP) Project 9‐58 The Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios. The purpose of this web‐based survey is to assess the current state of practice on the use of recycling agents in surface asphalt mixtures with high reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) at high recycled binder ratios. Recycled binder ratio is defined as the ratio of the RAP and/or RAS binder content in the mixture divided by the mixture’s total binder content, analogous to RAP binder ratio defined in NCHRP Report 752. Assuming typical values of total binder content, RAP binder content, and RAS binder content of 5%, 5%, and 20%, respectively; a high recycled binder ratio in the range of 0.3‐0.5 can be produced in mixtures with: (a) 30% RAP, (b) 8% RAS, or (c) 10% RAP and 5% RAS as an example. Your response will help formulate the laboratory and field experiments for this study. A follow‐up phone interview may be necessary to clarify some responses to the survey. Your participation is entirely voluntary, and you will receive no direct benefit from completing the survey. We would appreciate your response by November 14, 2014. Responses will not be confidential, but only aggregated results will be reported without identification of individual respondents. Questions marked with an asterisk (*) are necessary to make your survey usable. Please press NEXT SCREEN if you consent to participate in this study by completing the survey. If at any point you change your mind and decide not to participate, you can simply close the browser. Only complete responses will be recorded. 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What types of recycling agents do you produce? (Check all that apply) Paraffinic Oils Aromatic Extracts Napthenic Oils Tryglycerides & Fatty Acids Tall Oils Other Don’t know Please specify brand name and typical dosage rate.2. Do you have standard test methods or procedures for characterizing recycling agents? Yes No Don’t know Please list standard(s) by name / #. 3. What is the blending protocol followed during plant/field operations for your recycling agent(s)? Blending with virgin asphalt binder Blending with RAP and/or RAS Blending with virgin aggregate Other Don’t know Please describe briefly.4. What is the blending protocol followed during laboratory mixture production for your recycling agent(s)? Blending with virgin asphalt binder Blending with RAP and/or RAS Blending with virgin aggregate Other Don’t know Please describe briefly. Other5. Are you participating in any upcoming field projects using recycling agents in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios OR do you know of any surface asphalt mixtures with high recycled binder ratios and recycling agents that exhibited premature distress or failure? AND Are you willing to participate in NCHRP Project 9‐58 by sharing information on mix design, construction, materials, and/or performance monitoring for surface asphalt mixtures using your recycling agents? Please note that follow‐up email and/or phone contact will be necessary. Yes, willing to participate Yes, but not able to participate No Don’t know Additional CommentsPlease provide any additional comments, experiences, or challenges you wish to share about using recycling agents in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios. We sincerely appreciate your time in helping us complete this research project that will ultimately provide guidance useful to you as a pavement professional. Δ