Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies (2016)

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22 Web-Based Survey E-mail Introduction The Texas A&M Transportation Institute (TTI) is con- ducting National Cooperative Highway Research Program (NCHRP) Project 9-49B Performance of WMA Technologies: Stage I–Moisture Susceptibility Validation as follow-up work to completed NCHRP Project 9-49. This validation study includes a web-based survey (http://tti.tamu.edu/nchrp-9- 49b-web-based-survey/) to identify WMA pavements with mix design and quality assurance (QA) data that include labo- ratory test results from any of the following methods included in the guidelines generated in completed NCHRP Project 9-49 (see figure below): • Dry and wet indirect tensile (IDT) strength and tensile strength ratio (TSR) per AASHTO T 283 • Dry and wet resilient modulus (MR) per ASTM7369 with moisture conditioning per AASHTO T 283 • Hamburg Wheel Tracking Test (HWTT) per AASHTO T 324 This survey is being sent to state departments of trans- portation and selected contractors. We estimate that the sur- vey will take approximately 15–30 minutes to complete. We would appreciate your response by November 14, 2014. If you feel you are not the appropriate person to complete this survey, please send the alternate contact information to the Principal Investigator Amy Epps Martin (a-eppsmartin@ tamu.edu). Any questions or comments about the survey can also be directed to her. For questions about your rights as a research participant, or if you have questions, com- plaints, or concerns about the research, you may contact the Texas A&M University Human Subjects Protection Program at 979.458.4067, toll-free at 1.855.795.8636, or email at irb@ tamu.edu. Your participation is entirely voluntary, and you will receive no direct benefit from completing the survey. Responses will be confidential, but results will only be released in aggre- gate form and possibly by organization/company without identification of specific individual respondents. Questions marked with an asterisk (*) are necessary to make your sur- vey usable. Please use the survey link above to start the sur- vey if you consent to participate in this study. 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. Thank you in advance for your participation. Your response will help provide guidance to pavement professionals and practitioners. Web-Based Survey Introduction You are invited to complete an online survey as part of National Cooperative Highway Research Program (NCHRP) Project 9-49B Performance of WMA Technologies: Stage I– Moisture Susceptibility Validation. The purpose of this web- based survey is to identify WMA pavements with mix design and QA data that include laboratory test results from any of the following methods: • Dry and wet indirect tensile (IDT) strength and tensile strength ratio (TSR) per AASHTO T 283 • Dry and wet resilient modulus (MR) per ASTM7369 with moisture conditioning per AASHTO T 283 • Hamburg Wheel Tracking Test (HWTT) per AASHTO T 324 Your response will be used to validate the thresholds pro- posed in the NCHRP Project 9-49 guidelines for identify- ing potential moisture susceptibility in WMA. 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 A P P E N D I X A

Note a: if WMA LMLC is not available, use trial batch prior to production for verification: on-site PMLC or off-site PMLC with minimal reheating Note b: select a single test method and use it throughout the mix design verification Note c: If trial batch off-site PMLC specimens are used, employ the following thresholds (TSR and MR-ratio remain unchanged): Wet IDT ≥ 100 psi, Wet MR ≥ 300 ksi, SIP ≥ 6,000 cycles, stripping slope ≤ 2.0 µm/cycle LMLC Loose Mix STOA 2 h @ 240°F (116°C) HWTT per AASHTO T 324 Stripping Inflection Point (SIP) & Stripping Slope Moisture Conditioning per AASHTO T 283 Wet IDT Strength & TSR Indirect Tensile (IDT) Strength per AASHTO T 283 Resilient Modulus (MR) per modified ASTM D7369 Wet MR & MR- ratio ≥ 65 psi & ≥ 70% ≥ 200 ksi & ≥ 70% ≥ 3,500 cycles & ≤ 5.3 µm/cycle OK OK No No No OK Compacted Specimen LTOA per AASHTO R 30 LMLC Loose Mix STOA 2 h @ 240°F (116°C) HWTT per AASHTO T 324 Moisture Conditioning per AASHTO T 283 SIP & Stripping Slope IDT Strength per AASHTO T 283 MR per modified ASTM D7369 Wet IDT Strength Wet MR ≥ 115 psi ≥ 450 ksi ≥ 12,000 cycles & ≤ 1.4 µm/cycle Moisture Susceptible OK with Summer Aging OK with Summer Aging OK with Summer Aging Moisture Susceptible Moisture Susceptible Moisture Susceptibility at Early Life Add/modify anti-stripping agent and/or other mixture components Re-evaluate mixture with LTOA c c c a b b b b b b NCHRP 9-49 Proposed WMA moisture susceptibility evaluation for mix design and QA.

24 will be confidential, but results will only be released in aggre- gate form and possibly by organization/company without identification of specific individual respondents. Questions marked with an asterisk (*) are necessary to make your sur- vey 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 Info 1. Please provide your contact information *Name: *Company/Organization: *Address: *City: *State: *Zip: *Phone Number: *Email Address: WMA Use and Materials 2. To what extent does your organization utilize warm mix asphalt (WMA)? G Routine use G Trial or research projects only G Have never used WMA G Have used WMA before but not currently – please provide reason for discontinuation of use G I do not know 3. What types of WMA technologies does your organization use (please check all that apply)? G Accu-Shear™ G Advera® WMA G Aquablack™ G AquaFoam G Aspha-Min® G Cecabase® RT G Double Barrel Green® G ECOFOAM-II G Evotherm™ – please specify type(s) G LEADCAP G Low Emission Asphalt (LEA) G Meeker WMA G Rediset™ – please specify type(s) G REVIX™ G Sasobit® G Shell Thiopave™ G SonneWarmix G Terex® G TLA-X Warm Mix G Tri-Mix G Ultrafoam GX™ G WAM Foam® G Other – please list 4. Does your organization require the use of anti-stripping agents with WMA? G Yes, because of aggregates with a history of moisture susceptibility problems G Yes, because of laboratory test results indicating mois- ture susceptibility G Yes, due to other reason – please specify G No Moisture Susceptibility Tests and Criteria 5. *Does your organization have a standard or specification that includes moisture susceptibility laboratory testing as part of the mix design procedure or construction QA? G Yes, for mix design only – please write the standard/ specification G Yes, for construction QA only – please write the standard/ specification G Yes, for both mix design and construction QA G The same for mix design and construction QA – please write the standard/specification G Different for mix design and construction QA – please write the standards/specifications G No G I do not know 6. *1 2 3 What moisture susceptibility test(s) is (are) included in the standard/specification? Check all that apply and provide for each one details about the specimen fabrication protocol (short-term oven aging – STOA – of the loose mix prior to compaction), moisture conditioning procedure (or water temperature for Hamburg), and pass/fail criteria for hot mix asphalt (HMA) and WMA if they are different. G Wet Indirect Tensile (IDT) Strength Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature 1 This question will only appear when “Yes” is selected as answer for Question 5. 2 The details under each option will only appear when selected. 3 If the respondent selected “Different for mix design and construction QA” in Question 5, Question 6 needs to formulated as follows: 6a. “What moisture sus- ceptibility test(s) is (are) included in your moisture susceptibility specification for mix design (you will provide details for the construction QA specification in the following question)?” and 6b. “What moisture susceptibility test(s) is (are) included in your moisture susceptibility specification for construction QA?” Both 6a and 6b will include all options listed under Question 6.

25 G Protocol for WMA – please specify STOA time and temperature Moisture Conditioning Procedure G Per AASHTO T 283 G Per modified AASHTO T 283 – please specify G Other–please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify G Tensile Strength Ratio (TSR) Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature G Protocol for WMA – please specify STOA time and temperature Moisture Conditioning Procedure G Per AASHTO T 283 G Per modified AASHTO T 283 – please specify G Other – please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify G Resilient Modulus (MR) Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature G Protocol for WMA – please specify STOA time and temperature Moisture Conditioning Procedure G Per AASHTO T 283 G Per modified AASHTO T 283 – please specify G Other – please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify G Wet to Dry MR Ratio Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature G Protocol for WMA – please specify STOA time and temperature Moisture Conditioning Procedure G Per AASHTO T 283 G Per modified AASHTO T 283 – please specify G Other – please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify G Hamburg Wheel Tracking Test Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature G Protocol for WMA – please specify STOA time and temperature Water Temperature G Single water temperature irrespective of the binder PG grade G Different water temperature based on the binder PG grade – please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify G Other – please specify Specimen Fabrication Protocol G Same for HMA and WMA – please specify STOA time and temperature G Different for HMA and WMA G Protocol for HMA – please specify STOA time and temperature G Protocol for WMA – please specify STOA time and temperature Moisture Conditioning Procedure G Per AASHTO T 283 G Per modified AASHTO T 283 – please specify G Other – please specify Pass/Fail Criteria G Same for HMA and WMA – please specify G Different for HMA and WMA G Criteria for HMA – please specify G Criteria for WMA – please specify

26 Pavement Performance 7. *Have any of the WMA pavements in your state experi- enced premature or extensive moisture-related distress? G No moisture-related distress observed to date – please indicate the range of age of the pavement(s) showing adequate moisture-related performance G Yes – please indicate the type, extent, and severity of the failure, age of the pavement, and possible cause of failure (e.g., asphalt content, compaction level, aggre- gate type, etc.) 8. *Does your organization have laboratory test results (IDT, TSR, MR, or HWTT) or other information relevant to the moisture susceptibility guidelines proposed in NCHRP 9-49 that can be made available to the researchers conducting this study (please check all that apply)? G Mix design G Construction quality assurance G Field/forensic evaluation G Technical reports G Field cores G Other – please specify 9. *Does your organization have upcoming WMA projects and is willing to participate in NCHRP Project 9-49B by shar- ing information about mix design, construction, materials, and/or field performance monitoring? G Yes, willing to participate G Yes, but not able to participate G No upcoming WMA field projects Additional Comments 10. Please provide any additional comments, experiences, or challenges you wish to share about moisture susceptibility of WMA pavements.