Tack Coat Specifications, Materials, and Construction Practices (2018)

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85 Survey Questions for U.S. and Canadian Agencies Introduction 1. Please supply the contact information of the primary individual who filled out the survey. First Name ______________________ Last Name ______________________ Title ____________________________________________________________ Company Name ___________________________________________________ Street Address _____________________________________________________ Apt/Suite/Office ___________________________________________________ City _________________ State _________________ Zip __________________ Country _________________________________________________________ Email Address _____________________________________________________ Phone Number ____________________________________________________ FAX Number _____________________________________________________ Mobile Phone _____________________________________________________ URL ____________________________________________________________ Tack Coat Payment Specifications 2. How is tack coat paid for on your contracts? _________ a. individual pay item _________ b. incidental to paving 3. If it is paid as an individual item, how is it measured? (Check all that apply.) _________ a. volume of residual asphalt (the remaining asphalt after an emulsion has set, typically 57%–70% for an undiluted emulsion, 100% for a straight binder) _________ b. mass of residual asphalt _________ c. volume of undiluted emulsion (an emulsion which consists primarily of paving grade binder, water, and emulsifying agent) _________ d. mass of undiluted emulsion _________ e. volume of diluted emulsion (an undiluted emulsion with additional water added to it) _________ f. mass of diluted emulsion _________ g. other – write in (required)_______________________________________ A P P E N D I X A

86 Tack Coat Specifications, Materials, and Construction Practices Tack Coat Materials 4. Which types and grades of asphalt materials are commonly used for tack coat on your agency’s paving projects AND what percentage of your agency’s total tack coats do you esti- mate use the material? Use as many spaces as you need. (example: PG 64-22: 5%, SS-1h: 80%, NTSS-1HM: 15%) PG Binders Emulsified Asphalts Cutback Asphalts Reduced-Tracking Materials Other 5. Check all that apply if your agency specifies a specific tack coat material for nighttime paving: _________ a. PG Binders _________ b. Reduced-tracking material _________ c. Other – Write in (Required) ____________________________________ _________ d. Not applicable 6. Does your agency specify different application rates for different surface types? Please supply the target or target range of the RESIDUAL ASPHALT application rates for each surface type. If your agency has different application rates for different materials, please clarify in the “Additional Comments” box. To Convert an Application Rate to Residual Emulsion UNDILUTED EMULSION: multiply the application rate by the % residue of the emulsion to obtain the residual application rate (example: If your agency specifies an application range for UNDILUTED EMULSION of 0.05 to 0.10 gsy, and you use SS-1 emulsion with a 60% residual, the RESIDUAL ASPHALT application range would be 0.05 × 60% to 0.10 × 60%, or 0.03 to 0.06 gsy). DILUTED EMULSION: divide the rate by the appropriate dilution factor and then multiply the resulting application rate by the % residue of the emulsion to obtain the residual applica- tion rate (example: If your agency specifies an application range for 1:1 DILUTED EMULSION of 0.10 to 0.20 gsy, and you use SS-1 emulsion with a 60% residual, then first convert from DILUTED EMULSION to UNDILUTED EMULSION by dividing each range by two since 1 part water to 1 part emulsion is specified, taking you to 0.05 to 0.10 gsy EMULSION. Then the RESIDUAL ASPHALT application range would be 0.05 × 60% to 0.10 × 60%, or 0.03 to 0.06 gsy). Surface Type Tacked Residual Asphalt Application Rate (calculate from diluted or undiluted rate if necessary) (Example: 0.03 gal/sy if target rate or 0.03 to 0.05 gal/sy if target range) New Asphalt Existing (Old) Asphalt Milled Asphalt Surface Treatment (e.g. seal coat, chip seal) New or Existing PCC Milled or Diamond Ground PCC Additional Comments

Survey Questions for U.S. and Canadian Agencies 87 7. Who decides what the tack coat type and application rate will be? _________ a. agency or agency representative _________ b. contractor _________ c. supplier _________ d. other, please specify – Write in __________________________________ Tack Coat Application 8. What is required by your agency’s specifications for cleaning the pavement? _________ a. Power brooming or street sweeper _________ b. Air blowing or vacuum sweeper _________ c. Both A and B _________ d. Other – Write in (Required) _____________________________________ _________ e. Nothing 9. (Check all that apply.) Do your agency’s specifications and/or plan notes clearly state whether the application rate is for: _________ a. residual asphalt? (the remaining asphalt after an emulsion has set, typically 57–70% of the undiluted emulsion, or 100% for straight hot-applied binder) _________ b. undiluted emulsion? (an emulsion which consists primarily of a paving grade binder, water, and an emulsifying agent) _________ c. diluted emulsion? (an undiluted emulsion with additional water added to it. The most common dilution rate is 1:1 [one part undiluted emulsion and one part additional water]) _________ d. does not specifically state? 10. Is dilution of an emulsified tack coat allowed? (If dilution is not allowed, proceed to question 14.) _________ a. yes _________ b. no 11. If dilution is allowed, where is it allowed? (Check all that apply.) _________ a. at the asphalt supplier’s terminal? _________ b. at the contractor’s storage tank? _________ c. in the contractor’s distributor? _________ d. in another location? (please specify) – Write in (Required) _____________ 12. How is the dilution rate of an asphalt emulsion verified? (Check all that apply.) _________ a. certification by the asphalt supplier _________ b. certification by the contractor _________ c. sample taken and tested from the contractor’s storage tank _________ d. sample taken and tested from the distributor _________ e. visual observation during the dilution process _________ f. dilution rate is not verified _________ g. Other method, please specify – Write in (Required) __________________ 13. How often is the dilution rate verified? _________ a. daily _________ b. monthly _________ c. by project _________ d. never _________ e. other, please specify – Write in (Required) _________________________