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<p>This paper investigates how the selected testing variables influence the complex shear modulus (|G*|) at 10&#xa0;Hz and the permanent shear deformation (PSD) of asphalt mixtures. Laboratory experiments employed the Duplicate Shear Tester (DST) and the Shear Tester with Normal Stress (STNS). A one-way ANOVA (95% confidence level) was conducted to compare 27 groups of eight samples, examining the effects of fabrication time (morning, midday, evening), sample size (150&#xa0;mm and 100&#xa0;mm diameter), specimen geometry (rectangular samples cut in different directions), and testing method (Constant height in DST and applied normal stress of 113&#xa0;kPa in STNS). Results showed that the DST produced higher |G*| values than the STNS at a 10&#xa0;Hz loading frequency, with differences ranging from 7% to 58%, primarily due to its boundary restrictions, which limit vertical dilation. Smaller variations in the PSD were observed, influenced by temperature, mixture type, and production period, with no consistent pattern across devices. Overall, the DST indicated more rigid responses, while the STNS demonstrated more realistic field-deformation behavior, confirming that shear performance depends on testing configuration and mixture condition. The analysis proved that the sample size, geometry, and production time also have a noticeable impact on the shear response measurements of asphalt mixes.</p>

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Investigating the influence of varied test conditions on shear properties of asphalt mixes: insights from Duplicate Shear Tester (DST) and Shear Tester with Normal Stress (STNS)

  • 期刊论文

  • 发表日期：

    2026年2月23日

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  • Yazeed S. Jweihan,
  • Stefan A. Romanoschi,
  • Amjad H. Albayati,
  • Mazen J. Al-Kheetan

摘要

This paper investigates how the selected testing variables influence the complex shear modulus (|G*|) at 10 Hz and the permanent shear deformation (PSD) of asphalt mixtures. Laboratory experiments employed the Duplicate Shear Tester (DST) and the Shear Tester with Normal Stress (STNS). A one-way ANOVA (95% confidence level) was conducted to compare 27 groups of eight samples, examining the effects of fabrication time (morning, midday, evening), sample size (150 mm and 100 mm diameter), specimen geometry (rectangular samples cut in different directions), and testing method (Constant height in DST and applied normal stress of 113 kPa in STNS). Results showed that the DST produced higher |G*| values than the STNS at a 10 Hz loading frequency, with differences ranging from 7% to 58%, primarily due to its boundary restrictions, which limit vertical dilation. Smaller variations in the PSD were observed, influenced by temperature, mixture type, and production period, with no consistent pattern across devices. Overall, the DST indicated more rigid responses, while the STNS demonstrated more realistic field-deformation behavior, confirming that shear performance depends on testing configuration and mixture condition. The analysis proved that the sample size, geometry, and production time also have a noticeable impact on the shear response measurements of asphalt mixes.