Variability of Ignition Furnace Correction Factors (2017)

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A-1 1. Name of individual completing questionnaire: 2. Do you represent _____? a. Agency b. Contractor c. Testing lab 3. E-mail address we can contact you at? 4. Phone number we may reach you at for additional information? 5. How many ignition furnaces do you operate at this location? 6. What brands/models of ignition furnaces do you operate? a. Thermolyne Series 859/945 b. Fischer Thermo/Thermolyne Series 1087/1275 c. Troxler 4155 Asphalt Analyzer d. Troxler 4730/4731 NTO e. Gilson HM-378 Binder Ignition System f. Carbolite Asphalt Binder analyzer 7. What is the age(s) of the furnace(s) you work with? a. <2 years old b. 2–5 years old c. 5–10 years old d. 10–15 years old e. >15 years old 8. Do you perform AASHTO T 308, ASTM D6307, or have you revised the test procedure? If you have a revised test procedure, can you send the revised procedure with your response? 9. What factors have you encountered that affect the igni- tion furnace aggregate correction factor? Comments also allowed. a. Aggregate type/geology b. Test temperature c. Asphalt content d. Inclusion of hydrated lime 10. What is the typical range of aggregate correction factors for the mixes you work with? a. ≤0.50 b. 0.51–1.00 c. 1.01–2.00 d. >2.01 11. What aggregate types do you work with? Comments also allowed. a. Basalt b. Diabase c. Dolomite d. Granite e. Gravel f. Limestone g. Quartzite h. Sandstone i. Slag 12. Do you use hydrated lime? 13. Have you had any specific problems when using RAP and RAS? If yes, please identify. 14. Do you see differences in correction factors determined for different brands/models/locations of furnaces? 15. Who prepares correction factor samples? a. Contractor b. Agency c. Both 16. How do you ensure correction factor samples are repre- sentative of the design? 17. Do you ever share correction factors between furnaces or do you always require a unique correction factor for each furnace? Comments also allowed. a. Share correction factors b. Require unique correction factor for each furnace A p p e n d i x A State DOT and Contractor Survey

A-2 18. How frequently are correction factors determined or reevaluated for a specific mixture? a. More than once a year b. Once a year c. Once every 2 years d. Longer e. Correction factors are not reevaluated 19. Do you have criteria or a trigger for when correction fac- tors may need reevaluation? Yes or no answer with option for comments. 20. Do you modify your test procedure if correction factors are inconsistent or high? Yes or no answer with option for comments. 21. The asphalt sample is _____ when loaded into the furnace. a. Hot b. Room temperature c. Either–it depends 22. What are typical sample burn times? a. <30 min b. 30 min–1 h c. 1 h–1 h 30 min d. >1 h 30 min 23. Do you report measured asphalt content based on? a. Furnace ticket b. Loss calculated based on before and after weight on external scale 24. Do you conduct gradation tests on material recovered using the ignition furnace? Yes or no answer with option for comments. 25. If yes to question above, do you apply correction factors to the gradation? Yes or no answer with option for comments. 26. Are they washed gradations? 27. If you perform washed gradations, are samples hand washed or is an aggregate drum washer used? a. Hand washed b. Aggregate drum washer c. Both 28. How frequently are furnaces maintained? a. Weekly b. Monthly c. Yearly d. As needed 29. Do you have procedures for installing and maintaining furnaces? If so, could you please provide a copy? 30. What length of duct work is attached to your furnace exhaust? 31. How many 90-degree elbows are in the duct work? 32. Is more than one furnace connected to the same ductwork? 33. Approximately how many samples per year do you test in each furnace? 34. Have you had any significant problems with the test? Please check all that apply. Add comments for others. a. High aggregate correction factors b. Inconsistent test results c. Residual asphalt on sample d. Smoke from furnace entering laboratory e. Long burn times 35. Would you be willing to participate in a round-robin study? This should provide information to you that will be helpful in using best practices for ignition tests. We anticipate the round-robin study would require testing nine samples on your existing equipment.