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<p>This study proposes a simple formula to estimate the flexible pavement life (FPL) in balancing the number of converted dynamic axle loads against the design axle loads for the pavement service life of 15&#xa0;years. The value of the dynamic load coefficient is found by expressing the road surface roughness function in terms of international roughness index (IRI). The simulation of nine IRI values for two vehicle classes (bus and truck) indicates that the FPL falls with increasing pavement surface roughness. In both instances involving single-type cars, the FPL was lowered by roughly 5&#xa0;years at an IRI of 1.6&#xa0;m/km; at an IRI of 2.0&#xa0;m/km, it varied from 5 to 7&#xa0;years; and at an IRI of 2.5&#xa0;m/km, it was just 2 to 4&#xa0;years. Furthermore, in the three scenarios involving mixed-type vehicles, the FPL drastically decreases as IRI increases. In details, the IRI is 1.2, 1.6, and 1.8&#xa0;m/km, the FPL is barely two-thirds, one-third, and almost zero of the service life, respectively. Based on the results of the study, it can be concluded that the road surface roughness influence significantly the pavement performance life.</p>

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A Simple Formula in Calculating the Flexible Pavement Life Based on the Influence of Dynamic Vehicle-Uneven Pavement Interaction

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Van Quan Huynh,
  • Van Phuc Le

摘要

This study proposes a simple formula to estimate the flexible pavement life (FPL) in balancing the number of converted dynamic axle loads against the design axle loads for the pavement service life of 15 years. The value of the dynamic load coefficient is found by expressing the road surface roughness function in terms of international roughness index (IRI). The simulation of nine IRI values for two vehicle classes (bus and truck) indicates that the FPL falls with increasing pavement surface roughness. In both instances involving single-type cars, the FPL was lowered by roughly 5 years at an IRI of 1.6 m/km; at an IRI of 2.0 m/km, it varied from 5 to 7 years; and at an IRI of 2.5 m/km, it was just 2 to 4 years. Furthermore, in the three scenarios involving mixed-type vehicles, the FPL drastically decreases as IRI increases. In details, the IRI is 1.2, 1.6, and 1.8 m/km, the FPL is barely two-thirds, one-third, and almost zero of the service life, respectively. Based on the results of the study, it can be concluded that the road surface roughness influence significantly the pavement performance life.