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Improvements to the Duplicate Shear Test (DST) Device for Measuring the Fundamental Shear Properties of Asphalt Concrete Mixes

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Abstract

This study aimed to simplify the testing procedure of the duplicate shear tester (DST) and modify it for testing different shapes of Hot Mix Asphalt (HMA) specimens. The DST steel plates were replaced with aluminum plates of smaller dimensions to reduce its weight. The device was also modified to accommodate asphalt concrete specimens of 101.6 mm and 152.4 mm diameter cylindrical specimens and rectangular specimens cut parallel and perpendicular to the direction of compaction. Three asphalt mixes of different aggregate sizes and the same binder grade were collected from an asphalt plant located in North Texas. The frequency sweep test at constant height (FSCH) and repeated shear test at constant height (RSCH) were conducted following AASHTO T-320 test protocols using the DST on a total of ninety-six samples. The device proved its ability to provide repeatable measurements with a coefficient of variation less than 11%, 10%, and 13% for the measured dynamic shear modulus, shear-phase angle, and permanent shear deformation, respectively. Statistical analysis showed that testing different shapes of HMA specimens would affect the mean values for the measured shear parameters. However, the classical method of testing 152.4 mm. diameter cylindrical samples with the DST is recommended to determine the fundamental shear properties of asphalt mixes with good precision.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Contributions

YSJ: investigation, data curation, visualization, formal analysis, writing—original draft, writing—review and editing. SAR: resources, methodology, supervision, writing—review and editing. MJAl-K: data analysis, writing—review and editing. AT: writing—review, drawing and editing. YM: writing—review and editing. SSA: data analysis and writing—review. MJG: drawings and editing.

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Correspondence to Yazeed S. Jweihan.

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Jweihan, Y.S., Romanoschi, S.A., Al-Kheetan, M.J. et al. Improvements to the Duplicate Shear Test (DST) Device for Measuring the Fundamental Shear Properties of Asphalt Concrete Mixes. Int. J. Pavement Res. Technol. 16, 1255–1266 (2023). https://doi.org/10.1007/s42947-022-00194-7

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  • DOI: https://doi.org/10.1007/s42947-022-00194-7

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