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<p>This study evaluates the temperature dependent resilient modulus of 18 laboratory prepared asphalt mixtures tested at the Dynamic Testing Laboratory (LED) in Brazil. The mixtures were coded as Mix 1 to Mix 18 and comprised conventional, asphalt rubber, and polymer modified asphalt mixtures. The experimental program included binder type, aggregate and filler information, air voids, voids in mineral aggregate, voids filled with asphalt, bulk specific gravity, binder content, Marshall stability, indirect tensile strength, and resilient modulus values at 25, 35, and 45&#xa0;°C. Specimens were molded using Marshall impact compaction with 75 blows, and resilient modulus testing was performed by repeated load indirect tensile diametral compression. The analytical framework combined absolute resilient modulus, modulus retention ratios, stepwise temperature retention, stiffness loss, between mixture variability, and a logarithmic thermal susceptibility index. Asphalt rubber mixtures presented resilient modulus values from 3938 to 4736&#xa0;MPa at 25&#xa0;°C and from 523 to 629&#xa0;MPa at 45&#xa0;°C. At group level, asphalt rubber mixtures showed lower average modulus than the conventional group, but almost identical mean thermal susceptibility over the investigated temperature interval. The results show that temperature dependent resilient modulus data, when interpreted together with volumetric and mixture composition parameters, can support a technically consistent mixture level benchmarking framework. The findings should not be interpreted as isolating the independent effect of binder type, because the mixtures differ in aggregate source, gradation, filler type, binder formulation, and volumetric structure.</p>

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Temperature dependent resilient modulus of Marshall compacted asphalt rubber mixtures

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月10日

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  • Raphael Lúcio Reis dos Santos,
  • Vinícius Antônio Florentino Camargo,
  • George Yun

摘要

This study evaluates the temperature dependent resilient modulus of 18 laboratory prepared asphalt mixtures tested at the Dynamic Testing Laboratory (LED) in Brazil. The mixtures were coded as Mix 1 to Mix 18 and comprised conventional, asphalt rubber, and polymer modified asphalt mixtures. The experimental program included binder type, aggregate and filler information, air voids, voids in mineral aggregate, voids filled with asphalt, bulk specific gravity, binder content, Marshall stability, indirect tensile strength, and resilient modulus values at 25, 35, and 45 °C. Specimens were molded using Marshall impact compaction with 75 blows, and resilient modulus testing was performed by repeated load indirect tensile diametral compression. The analytical framework combined absolute resilient modulus, modulus retention ratios, stepwise temperature retention, stiffness loss, between mixture variability, and a logarithmic thermal susceptibility index. Asphalt rubber mixtures presented resilient modulus values from 3938 to 4736 MPa at 25 °C and from 523 to 629 MPa at 45 °C. At group level, asphalt rubber mixtures showed lower average modulus than the conventional group, but almost identical mean thermal susceptibility over the investigated temperature interval. The results show that temperature dependent resilient modulus data, when interpreted together with volumetric and mixture composition parameters, can support a technically consistent mixture level benchmarking framework. The findings should not be interpreted as isolating the independent effect of binder type, because the mixtures differ in aggregate source, gradation, filler type, binder formulation, and volumetric structure.