Round-Robin Study of Asphalt-Concrete Content by Ignition

Brown, E R; Mager, S.

doi:10.1177/0361198196154300117

Cited by 3 publications

(2 citation statements)

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“…The within-laboratory standard deviation for the ignition furnace is reported to be 0.04% (8). Figure 3 indicates that although the standard test method produced the smallest average bias or error, it had the highest pooled standard deviation when determining the cor-…”

Section: Accuracy and Variability Of Measured Asphalt Contentsmentioning

confidence: 98%

Refinement of the Hot-Mix Asphalt Ignition Method for High-Loss Aggregates

Hurley

Prowell

2005

Transportation Research Record

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Four methodologies for determining the asphalt content of mixtures containing high-loss aggregates in the ignition furnace were evaluated: the standard method using the Thermolyne furnace (control), the Troxler NTO infrared furnace, the Ontario method, and a Tempyrox glass-cleaning oven. Six aggregate sources with high ignition furnace aggregate corrections were obtained from around the country: four dolomites, a basalt, and a serpentine/chlorite. Calibration factors were determined for each method at optimum asphalt content. Additional samples were then tested at optimum plus 0.5% asphalt content, and the measured asphalt content was calculated by using the correction factor determined for that method and aggregate source. The Tempyrox Pyro-Clean furnace, commonly used for cleaning laboratory glassware, produced the lowest aggregate correction factors. The standard method and the Ontario method, both using the Thermolyne ignition furnace, produced the smallest bias or error in measured asphalt content. The standard deviation of the corrected asphalt contents for these high-loss sources was higher than the within-laboratory standard deviation reported for AASHTO T308. The only exception was the Alabama source using the standard method. The Ontario method and Tempyrox oven generally reduced the variability of asphalt content measurements for high-loss aggregates. None of the methods evaluated statistically reduced aggregate breakdown on the nominal maximum aggregate size and 4.75-mm sieves. The Ontario method significantly reduced, but did not eliminate, aggregate breakdown on the 0.075-mm sieve. The Ontario method is the best method for immediate implementation for determining the asphalt content by the ignition method for high-loss aggregates.

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Section: Accuracy and Variability Of Measured Asphalt Contentsmentioning

confidence: 98%

Refinement of the Hot-Mix Asphalt Ignition Method for High-Loss Aggregates

Hurley

Prowell

2005

Transportation Research Record

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“…It is a non-crystalline, viscous substance with a black or dark brown appearance, substantially soluble in carbon disulphide (CS2), and characterized by adhesive and waterproofing qualities. Comprising predominantly of hydrocarbons, bitumen typically contains a minimum of 80% carbon and 15% hydrogen, with the remaining composition including oxygen, sulphur, nitrogen, and traces of various metals [3]. It is usually obtained through a distillation process.…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

Mechanical properties of cold mixed asphalt

Kolo,

Shehu,

Abdulrahman

et al. 2024

Engineering Today

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The mechanical and performance characteristics of cold mix asphalt derived from straight-run bitumen blended with dissolved polythene were assessed to determine the engineering, environmental, and economic feasibility of a recently developed product for pavement maintenance. The cold mix asphalt binder was created by treating a portion of straight-run bitumen with chemically dissolved polythene waste sachets at a temperature of approximately 80°C, employing an alkaline emulsifier, chemical surfactant, and water. The formulation for the cold mix asphalt involved 35% coarse aggregates, 65% fine aggregate, and 10% mineral filler, with an optimal binder content of 8.3%. Standard laboratory Marshall tests, static loading/unloading in both laboratory and field settings, and real-time traffic loads were applied to the cold asphalt mixes to establish comparative performance. The Marshall Stability, flow, and density of the experimental cold mix asphalt were determined as 5.08 kN, 4.0 mm, and 1.98 g/cm3, respectively. In comparison, the corresponding values for the other three commercially available cold asphalt mixes ranged from 0 to 4.27 kN, 0 to 5.5 mm, and 1.60 to 1.85 g/cm3. The rate of deformation of experimental cold mix with respect to time and traffic load respectively 0.0086mm/week and 0.00877mm/standard 80 kN standard axle, which are more favorable than the corresponding values for the commercial mixes.

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Alternate Methods To Determine Asphalt Content

Prowell

1998

Transportation Research Record

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A method was identified to determine asphalt content to replace chlorinated solvent extraction. Production of trichloroethane was banned on December 31, 1995, as part of the 1990 Clean Air Act Amendments. Initially, the study focused on evaluating the nuclear asphalt content gauge with Marshall plugs. During the course of the research, early data from the National Center for Asphalt Technology (NCAT) indicated that the ignition method was a promising alternative. Testing was conducted with three generations of ignition furnaces. Four aggregate types were evaluated with typical surface mix and base mix gradations found in Virginia. Samples for evaluation were produced at four asphalt contents for each mix design representing typical field variation around the optimum. Operator variance samples were tested nondestructively in the nuclear gauge and then destructively by solvent extraction and the ignition method. As a result of the research, a test method was developed using the ignition furnace with an internal weighing system. This method has been specified as a replacement for solvent extraction in Virginia.

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Round-Robin Study of Asphalt-Concrete Content by Ignition

Cited by 3 publications

References 0 publications

Refinement of the Hot-Mix Asphalt Ignition Method for High-Loss Aggregates

Refinement of the Hot-Mix Asphalt Ignition Method for High-Loss Aggregates

Mechanical properties of cold mixed asphalt

Alternate Methods To Determine Asphalt Content

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