This paper studies the relationship between laboratory measurements of fatigue performance and fracture performance of conventional asphalt mixtures, asphalt mixtures with reclaimed asphalt pavement (RAP), and rubberized asphalt mixtures. The existing four-point bending (4PB) test was developed to evaluate the fatigue performance of asphalt pavements; however, it is not necessarily appropriate for use in routine job mix formula approval and is too slow and expensive for quality control/quality assurance (QC/QA). In this paper, the semi-circular bending test and indirect tensile asphalt cracking test (IDEAL-CT) were evaluated for their potential to serve as a simple and fast surrogate fatigue performance related test for QC/QA on routine projects and routine mix design. Multiple representative fracture parameters were obtained from the Illinois flexibility index test and the IDEAL-CT. The coefficient of variation revealed that the lowest variability from both tests was in fracture strength. In addition, the linear regression analysis between fracture parameters and fatigue performance indicated that slopes, fracture toughness, and strength from fracture tests have good correlations with the initial flexural stiffness from 4PB tests, while 4PB initial stiffness is well correlated with fatigue life. The direct correlation between fracture properties and fatigue life was not as good. The fracture parameter “strength” also showed the capability of discriminating among asphalt materials with low RAP content.

本文研究了常规沥青混合料，再生沥青路面（RAP）的沥青混合料和橡胶沥青混合料的疲劳性能和断裂性能的实验室测量值之间的关系。开发了现有的四点弯曲（4PB）测试来评估沥​​青路面的疲劳性能。但是，它不一定适合用于常规的工作组合公式批准，并且对于质量控制/质量保证（QC / QA）来说太慢且太昂贵。在本文中，对半圆形弯曲试验和间接拉伸沥青裂化试验（IDEAL-CT）的潜力进行了评估，以作为常规项目和常规混合料设计中用于QC / QA的简单，快速的替代疲劳性能相关试验。从伊利诺伊州柔韧性指数测试和IDEAL-CT获得了多个代表性的断裂参数。变异系数表明，两个试验的最低变异性是断裂强度。此外，断裂参数与疲劳性能之间的线性回归分析表明，断裂试验的斜率，断裂韧性和强度与4PB试验的初始挠曲刚度有良好的相关性，而4PB试验的初始刚度与疲劳寿命有很好的相关性。断裂性能与疲劳寿命之间的直接相关性不是很好。断裂参数“强度”还显示了区分低RAP含量的沥青材料的能力。变异系数表明，两个试验的最低变异性是断裂强度。此外，断裂参数与疲劳性能之间的线性回归分析表明，断裂试验的斜率，断裂韧性和强度与4PB试验的初始挠曲刚度有良好的相关性，而4PB试验的初始刚度与疲劳寿命有很好的相关性。断裂性能与疲劳寿命之间的直接相关性不是很好。断裂参数“强度”还显示了区分低RAP含量的沥青材料的能力。变异系数表明，两个试验的最低变异性是断裂强度。此外，断裂参数与疲劳性能之间的线性回归分析表明，断裂试验的斜率，断裂韧性和强度与4PB试验的初始挠曲刚度具有良好的相关性，而4PB试验的初始刚度与疲劳寿命则具有良好的相关性。断裂性能与疲劳寿命之间的直接相关性不是很好。断裂参数“强度”还显示了区分低RAP含量的沥青材料的能力。断裂试验的强度和强度与4PB试验的初始抗弯刚度有很好的相关性，而4PB初始刚度与疲劳寿命有很好的相关性。断裂性能与疲劳寿命之间的直接相关性不是很好。断裂参数“强度”还显示了区分低RAP含量的沥青材料的能力。断裂试验的强度和强度与4PB试验的初始抗弯刚度有很好的相关性，而4PB初始刚度与疲劳寿命有很好的相关性。断裂性能与疲劳寿命之间的直接相关性不是很好。断裂参数“强度”还显示了区分低RAP含量的沥青材料的能力。