NCHRP 9‐58: State DOT Web-Based Survey Step 1 of 11 9% 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. 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. Contact Information Please provide your contact information.1. Name* First Last Company/Organization* Address* Street Address Address Line 2 City State / Province / Region ZIP / Postal Code AfghanistanAlbaniaAlgeriaAmerican SamoaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Sint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBrunei DarussalamBulgariaBurkina FasoBurundiCabo VerdeCambodiaCameroonCanadaCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos IslandsColombiaComorosCongoCongo, Democratic Republic of theCook IslandsCosta RicaCroatiaCubaCuraçaoCyprusCzechiaCôte d'IvoireDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEswatiniEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuamGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHoly SeeHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIrelandIsle of ManIsraelItalyJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKorea, Democratic People's Republic ofKorea, Republic ofKuwaitKyrgyzstanLao People's Democratic RepublicLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacaoMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth MacedoniaNorthern Mariana IslandsNorwayOmanPakistanPalauPalestine, State ofPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalPuerto RicoQatarRomaniaRussian FederationRwandaRéunionSaint BarthélemySaint Helena, Ascension and Tristan da CunhaSaint Kitts and NevisSaint LuciaSaint MartinSaint Pierre and MiquelonSaint Vincent and the GrenadinesSamoaSan MarinoSao Tome and PrincipeSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSint MaartenSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia and the South Sandwich IslandsSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwedenSwitzerlandSyria Arab RepublicTaiwanTajikistanTanzania, the United Republic ofThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkmenistanTurks and Caicos IslandsTuvaluTürkiyeUS Minor Outlying IslandsUgandaUkraineUnited Arab EmiratesUnited KingdomUnited StatesUruguayUzbekistanVanuatuVenezuelaViet NamVirgin Islands, BritishVirgin Islands, U.S.Wallis and FutunaWestern SaharaYemenZambiaZimbabweÅland Islands Country Phone*Email* Use of High Recycled Binder Ratios Recycled binder ratio in this section 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.1. What is your predominant use of RAP and/or RAS in surface asphalt mixtures? Predominant use of RAP Predominant use of RAS Predominant use of RAP and RAS Please list typical percentage. 2. What is your current practice with regard to using RAP in surface asphalt mixtures? Not allowed by current specifications Required Allowed as an option Allowed as a separate bid item Used previously Don’t know Please provide reason(s) for restriction. Please specify maximum percentage by weight of mix. Please provide reason(s) for discontinuation of use. 3. What is your typical RAP content in surface asphalt mixtures (with no RAS)? Do not use 0‐10% by weight of mix 11‐20% by weight of mix 21‐30% by weight of mix >30% by weight of mix Don’t know 4. What are the main barriers, if any, to using higher levels of RAP in surface asphalt mixtures? (Check all that apply) No significant barriers Current specification limits Lack of a mix design procedure Problems meeting mix design criteria RAP variability RAP availability RAP management difficulties (e.g., segregation, stockpiling, crushing, fractionation, etc.) Mix production difficulties (e.g., moisture content, changes in plant operation, workability, etc.) Poor pavement performance (i.e., premature distress or failure) Others Please describe briefly.If Current specification limits or Poor pavement performance is chosen, please include a brief description.Please list.If RAP management difficulties, Mix production difficulties, or Others is chosen, please include a brief description.5. What is your current practice with regard to using RAS in surface asphalt mixtures? Not allowed by current specifictions Required Allowed as an option Allowed as a separate bid item Used previously Don’t know Please provide reason(s) for restriction.Please specify maximum percentage by weight of mix. Please provide reason(s) for discontinuation of use.6. What is your typical RAS content in surface asphalt mixtures (with no RAP)? Do not use 0‐3% by weight of mix 4‐6% by weight of mix 7‐9% by weight of mix >9% by weight of mix Don’t know 7. What are the main barriers, if any, to using higher levels of RAS in surface asphalt mixtures? (Check all that apply) No significant barriers Current specification limits Lack of a mix design procedure Problems meeting mix design criteria RAS variability RAS availability RAS management difficulties (e.g., segregation, stockpiling, crushing, fractionation, etc.) Mix production difficulties (e.g., moisture content, changes in plant operation, workability, etc.) Poor pavement performance (i.e., premature distress or failure) Others Please describe briefly.If Current specification limits, or Poor pavement performance is chosen, please include a brief description.Please list.If RAS management difficulties, Mix production difficulties, or Others is chosen, please include a brief description.8. Do you have a requirement for recycled binder ratio for surface asphalt mixtures with RAP and/or RAS? Yes No Don’t know Please specify minimum and/or maximum values. 9. Do you have standard test methods or procedures for characterizing RAP and/or RAS? Yes No Don’t know Please list standard(s) by name/# 10. Do you have standard test methods or procedures for designing surface asphalt mixtures with RAP and/or RAS? Yes No Don’t know Please list standard(s) by name/#11. What performance tests, if any, are required for surface asphalt mixtures with RAP and/or RAS? (Check all that apply) No performance tests are required Hamburg Wheel Tracking Test (HWTT) Asphalt Pavement Analyzer (APA) Flow Number Test Simplified Viscoelastic Continuum Damage (S‐VECD) Overlay Cracking Test Thermal Stress Restrained Specimen Test (TSRST) Indirect Tensile (IDT) / Tensile Strength Ratio (TSR) Dynamic Modulus Resilient Modulus Creep Compliance Others Don’t know Please list standard(s) by name / #Please list.If Others is chosen, please list.12. What premature distresses or failures, if any, have you observed for surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios? (Check all that apply) No premature distress or failure has been observed to date Fatigue cracking Thermal cracking Reflective Cracking Other distress Don’t know Please identify.If Other distress is chosen, please identify. Use of Recycling Agents Recycling Agent in this section is defined as an additive that is incorporated in the surface asphalt mixture to soften or rejuvenate the RAP and/or RAS materials.13. What is your current practice with regard to using recycling agents in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios? Do not use / Not allowed by current specification Required Allowed Used previously Don’t know Please provide reason(s) for restriction.Please specify how dosage rate is determined.Please provide reason(s) for discontinuation of use.14. What recycling agents to you use in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios? (Check all that apply) Do not use BITUTECH RAP CPR™ CYCLOGEN® Ergon HyPrene® Hydrogreen® Hydrolene® Reclamite® RejuvaSeal SonneWarmix RJ™ Storbit® SYLVAROAD™ RP1000 ValAro 130A® Valero VP 165® Others Don’t know Please provide typical dosage rate. For "Others" please list and include typical dosage rate. 15. What are the main barriers, if any, to utilizing recycling agents in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios? (Check all that apply) No significant barriers Current specification limits Lack of tests and criteria to determine dosage rate and/or performance Recycling agent availability Lack of expertise in using recycling agents Poor performance (i.e., premature distress or failure) Others Please describe briefly.16. Do you have standard test methods or procedures for characterizing recycling agents? Yes No Don’t know Please list standard(s) by name / #.17. Do you have standard test methods or procedures for designing surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios and recycling agents (including determining the dosage rate)? Yes No Don’t know Please list standard(s) by name / #. 18. What laboratory tests, if any, are required for characterizing the properties of binders containing recycling agents? (Check all that apply) No laboratory tests are required G*, δ by Dynamic Shear Rheometer (DSR) S, m‐value by Bending Beam Rheometer (BBR) Multiple Stress Creep Recovery (MSCR) by Dynamic Shear Rheometer (DSR) Linear Amplitude Sweep (LAS) by Dynamic Shear Rheometer (DSR) Others Don’t know Please list standard(s) by name / #If “Others” is chosen, please describe briefly.19. What performance tests, if any, are required for surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios and recycling agents? (Check all that apply) No performance tests are required Hamburg Wheel Tracking Test (HWTT) Asphalt Pavement Analyzer (APA) Flow Number Test Simplified Viscoelastic Continuum Damage (S‐VECD) Overlay Cracking Test Thermal Stress Restrained Specimen Test (TSRST) Indirect Tensile (IDT) / Tensile Strength Ratio (TSR) Dynamic Modulus Resilient Modulus Creep Compliance Others Don’t know Please list standard(s) by name / #If “Others” is chosen, please describe briefly. Other20. Do you have upcoming field projects using recycling agents in surface asphalt mixtures with RAP and/or RAS at high recycled binder ratios OR surface asphalt mixtures with high recycled binder ratios that exhibited premature distress or failure? AND Are you willing to participate in NCHRP Project 9‐58 by sharing information about mix design, construction, materials, and/or performance monitoring? 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