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Variability of Ignition Furnace Correction Factors (2017) / Chapter Skim
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Pages 104-116

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From page 104...
... I-1 A p p e n d i x i Proposed Standard Practice for Installation, Operation, and Maintenance of Ignition Furnaces with Commentary AASHTO Designation: R X-16 1.
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From page 105...
... I-2 ThermoFisher, Thermolyne NCAT Asphalt Content Tester Installation and Operation Manual Troxler Electronic Laboratories, Inc., Manual of Operation and Instruction – Troxler NTO Asphalt Content Ignition Oven 2.3. Other Documents: HMA Lab Supply, Inc., NCAT Maintenance Tips 3.
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From page 106...
... I-3 upper side access panel. A vacuum cleaner (with appropriate filter)
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From page 107...
... I-4 temperature air before exiting the furnace. This can still result in hot exhaust gas temperatures.
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From page 108...
... I-5 adjusted to prevent too much air from being drawn through the furnaces. There must be negative pressure at the damper to prevent exhaust from entering the laboratory.
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From page 109...
... I-6 AASHTO T 308 describes the test procedure for asphalt content determination using an ignition furnace. The manufacturer's manual describes operation of specific furnace models.
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From page 110...
... I-7 these different handling practices have not been studied. The following are recommended for consistency: AASHTO T 308 specifies that the sample be dried to constant mass at 110 ± 5°C or that the moisture content of a companion sample be determined according to AASHTO T 329.
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From page 111...
... I-8 Some volatiles in the asphalt will be driven off before the sample reaches ignition temperatures. Once the asphalt ignites, the furnace temperature may spike higher than the set point as the chamber is heated by the burning asphalt (assuming sufficient available oxygen)
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From page 112...
... I-9 4.7. Troubleshooting -- The following can help troubleshoot asphalt contents that appear erroneous: Even when using a furnace with an internal balance, it can be beneficial to measure an overall mass of the cooled sample/basket(s)
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From page 113...
... I-10 The blower on the ThermoFisher (or older Thermolyne) models should be cleaned and oiled every 6 months or when the furnace fails the lift test.
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From page 114...
... I-11 manufacturers' manuals contain instructions for replacing elements. Dense smoke from the furnace exhaust could indicate a problem with the after-burner heating element(s)
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From page 115...
... Abbreviations and acronyms used without definitions in TRB publications: A4A Airlines for America AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FAST Fixing America's Surface Transportation Act (2015) FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers MAP-21 Moving Ahead for Progress in the 21st Century Act (2012)
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From page 116...
... TRA N SPO RTATIO N RESEA RCH BO A RD 500 Fifth Street, N W W ashington, D C 20001 A D D RESS SERV ICE REQ U ESTED ISBN 978-0-309-44637-2 9 7 8 0 3 0 9 4 4 6 3 7 2 9 0 0 0 0 N O N -PR O FIT O R G .
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