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<p>One way to reduce cracking distresses in asphalt pavements is through material screening and appropriate mixture design. The purpose of this study is finding optimum types and levels of mix variables resulting better crack-resistant properties at intermediate and low temperature as well as less moisture damage. Experiments were designed by Taguchi method, performed on semicircular samples and Illinois Flexibility Index Test (IFIT) test method is used to investigate the fracture properties of mixes as a valid indication of crack performance. Fracture energy and maximum load derived from Semi-Circular Bending Test (SCB) test are used to evaluate 162 SCB specimens that are tested to study the effect of aggregate type and gradation, filler type and amount, asphalt binder type and amount on fatigue cracking, low-temperature cracking and moisture damage sensitivity of mixtures. Generally, results demonstrated that the Taguchi method can predict optimum mix behavior with a good approximation that Taguchi method can predict optimum mix behavior with a good approximation and can be used for the performance-related design of asphalt mixes, successfully. Also the results shows that the asphalt binder amount has the greatest effect on the fatigue cracking, low-temperature cracking and moisture damage properties of the mixture. The next important factors for fatigue cracking and low-temperature cracking are the filler type, the filler amount, the aggregate gradation, the asphalt binder type and finally the aggregate type, successively; while for moisture damage the next important factors are aggregate gradation, asphalt binder type, filler amount or aggregate type and finally the filler type.</p>

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Evaluating the Effects of Mix Ingredients and Properties on the Fracture Behavior of Asphalt Mixes with Semicircular Bending Test

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Mohammad Hoseinpour-Lonbar,
  • Mohammad Zia Alavi,
  • Massoud Palassi

摘要

One way to reduce cracking distresses in asphalt pavements is through material screening and appropriate mixture design. The purpose of this study is finding optimum types and levels of mix variables resulting better crack-resistant properties at intermediate and low temperature as well as less moisture damage. Experiments were designed by Taguchi method, performed on semicircular samples and Illinois Flexibility Index Test (IFIT) test method is used to investigate the fracture properties of mixes as a valid indication of crack performance. Fracture energy and maximum load derived from Semi-Circular Bending Test (SCB) test are used to evaluate 162 SCB specimens that are tested to study the effect of aggregate type and gradation, filler type and amount, asphalt binder type and amount on fatigue cracking, low-temperature cracking and moisture damage sensitivity of mixtures. Generally, results demonstrated that the Taguchi method can predict optimum mix behavior with a good approximation that Taguchi method can predict optimum mix behavior with a good approximation and can be used for the performance-related design of asphalt mixes, successfully. Also the results shows that the asphalt binder amount has the greatest effect on the fatigue cracking, low-temperature cracking and moisture damage properties of the mixture. The next important factors for fatigue cracking and low-temperature cracking are the filler type, the filler amount, the aggregate gradation, the asphalt binder type and finally the aggregate type, successively; while for moisture damage the next important factors are aggregate gradation, asphalt binder type, filler amount or aggregate type and finally the filler type.