Comparative study of the mechanical properties of Hma mixture: Field vs laboratory

Document Type

Conference Proceeding

Publication Date

12-1-2007

Abstract

This paper presents the variability in the mechanistic properties of HMA due to mixture production; characterize and compare the mechanistic properties of roadway cores and laboratory compacted samples; and develop relationships between modulus/stiffness of HMA mixtures from in situ non destructive tests and those obtained from laboratory tests. Six mixtures from three rehabilitation projects were selected for this investigation. Several test sections were evaluated from each project. The mechanistic evaluation on laboratory compacted samples and roadway cores included the Indirect Tensile Strength (ITS), Indirect Tensile Resilient Modulus (ITMr), Frequency Sweep at Constant Height (FSCH), and Loaded Wheel Tracking (LWT) tests. In addition, three types of in-situ non destructive test (NDT) devices, namely, falling weight deflectometer (FWD), light falling weight deflectometer (LFWD), and a portable seismic pavement analyzer (PSPA) were considered. In general, the coefficients of variation of mechanistic properties was higher for laboratory compacted samples than roadway cores. Also, the results from the FSCH test for laboratory samples were significantly higher than roadway cores. Good correlations were observed between roadway cores and laboratory compacted samples in terms of complex shear moduli and indirect tensile resilient moduli. A methodology was developed for the prediction of laboratory resilient modulus from the in situ PSPA test parameter. Field test results indicated that the LFWD test may be used as an alternative for the FWD test in pavement structure evaluation.

Publication Source (Journal or Book title)

Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions

First Page

887

Last Page

918

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