The Troxler Model 2226 asphalt content gauge was evaluated in the laboratory and taken into the field where its results were compared to conventional reflux values. The precision as evaluated in the laboratory was found to be excellent - equivalent to .06% asphalt content with a 45 second count. The gauge does have to be recalibrated each time a different aggregate is used and as a practical matter should be recalibrated for each different mix type. Sample preparation is important and samples should be as uniform as possible. The accuracy appears to be as good as that of the reflux extractor. A recommendation for using the nuclear gauge is appended.
Several processes have been developed to reduce the mixing and compaction temperatures of hot mix asphalt (HMA) without sacrificing the quality of the...
Mechanistic pavement design procedures based on elastic layer theory require characterization of pavement layer materials including subgrade soil. Thi...
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