Context and Content

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Context and Content (1999)

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by Washington D. C , J. Harvey , I. Guada , F. Long

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@MISC{C99contextand,
    author = {Washington D. C and J. Harvey and I. Guada and F. Long},
    title = {Context and Content},
    year = {1999}
}

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Abstract

This report presents the results of laboratory tests and analyses performed as a part of the effort by the Federal Highway Administration (FHWA) to develop simple performance tests for asphalt concrete mix analysis and design for highway pavement applications. Three specific areas are addressed, namely: 1. The non-linearity of shape distortion (shear) properties, information required to assess the use of indirect methods to measure the shear response of asphalt mixes; 2. appropriate shape an specimen size for use in a simple performance test; and 3. comparison of mix rutting performance determined from specimens prepared using the Superpave gyratory compactor (SGC) and specimens of the same mix obtained by coring from a pavement section To assess the non-linearity of mix response to shear, (Chapter 3), frequency sweep tests were performed in the simple shear test on pavement cores. Three temperatures (20, 40, and 57C), three strain levels (0.01, 0.05, and 0.1 percent), and ten frequencies (in the range 10 to 0.01 Hz) were utilized. Results of the tests indicated that the complex modulus, G*, exhibited non-linear behavior for these ranges of temperatures, strain levels, and frequencies. Generally, G* decreased as the strain level was increased. This reduction, percentage wise, was larger as the temperature increased and the frequency decreased. Only at the lowest temperature and higher frequencies was it possible to deduce the complex Young's modulus, E*, from the measured value of G* assuming the applicability of linear elastic behavior. To evaluate the influence of specimen size and shape (Chapter 4) on the variability of results obtained in the repeated simple shear test at constant height (RSST-CH), cylindrical specimens 150 and 200 mm in diameter by 50 mm in height ...

Keyphrases

strain level simple performance test specimen size laboratory test mix response frequency sweep test appropriate shape indirect method asphalt mix ten frequency complex modulus pavement core asphalt concrete mix analysis federal highway administration linear elastic behavior shape distortion shear response non-linear behavior cylindrical specimen repeated simple shear test complex young simple shear test superpave gyratory compactor pavement section percentage wise specific area constant height highway pavement application

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