Variability of Ignition Furnace Correction Factors (2017) / Chapter Skim
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Pages 27-33
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From page 27... ...
27 C h a p t e r 4 The literature review and survey of state DOT and industry practices regarding the use of ignition furnaces conducted in Phase I were used to refine the list of factors that may affect the variability of asphalt content and aggregate gradation correction factors for ignition furnaces. Based on this information, a series of studies were designed, conducted, and analyzed to evaluate different ignition furnaces for a number of factors to determine how these factors affect the results and what improvements could be made to minimize variability when different units are used.
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28 on the differences in correction factors in one mix design with and without lime was also explored. The Phase I survey also indicated that most agencies use aggregates with correction factors of less than 0.5% or between 0.5% and 1.0%.
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29 Asphalt Content. Two asphalt content levels were evaluated with each of the four aggregates: optimum asphalt content minus 1% and optimum asphalt content plus 1%.
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30 for a half factorial. Since duplicate tests were conducted, this design results in 64 total tests for a half factorial.
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31 designs would have approximately the same gradation. Once the aggregates were collected, each aggregate type was oven dried and then batched to achieve the desired blend.
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32 Participating Lab Description Agency/Contractor Furnace Brand Furnace Age(Years) DOT Alabama Thermolyne Arizona Thermolyne Arkansas Troxler Florida Thermolyne Indiana Thermolyne Kansas Gilson Louisiana Thermolyne Massachusetts Troxler Minnesota Thermolyne Mississippi Thermolyne Missouri Thermolyne Troxler Montana Troxler New Mexico Gilson South Carolina Thermolyne Ohio Thermolyne, Gilson Tennessee Thermolyne, Troxler Virginia Thermolyne Washington Thermolyne Contractor/research The Miller Group Troxler Pike Industries Thermolyne, Troxler NCAT Troxler, Thermolyne Staker Parson (Utah)
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From page 33... ...
33 Table 25 includes total number of mixtures, samples sent to each laboratory per unit, number of specimens, and tests that were conducted by each laboratory. Similar to the procedure followed for the sensitivity study, individual specimens were batched at a mass that yielded a sample size of approximately 1,500 g after mixing with the asphalt binder.
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