ABSTRACT

Reliable assessment of asphalt binder aging is important for material selection and the prediction of asphalt property changes in field pavements. The apparent property changes of asphalt binder with aging, however, are affected by aging conditions. In this study, three aging treatment methods were applied to five types of asphalt binders, and the longest aging treatment period lasted for 1.5 years. Asphalt binder samples obtained during the aging treatment processes were systematically tested for dynamic rheological properties. The apparent aging susceptibility of asphalt binders was found to be affected by aging conditions. Thin-film aging under a more ‘natural’ condition appears to be quite effective in accelerating the aging process. The changes of the coefficients in the Christensen-Anderson model and the Williams–Landel–Ferry equation in the tests suggest that binders’ dynamic rheological properties during the long-term aging process may be reliably predicted through laboratory tests. This is conditioned on the binders having been artificially aged to pass the ‘spurt’ reaction stage and data points being collected from the ‘steady’ reaction stage under more ‘natural’ aging conditions. To predict asphalt binder aging in field pavements, additional research is needed to consider the influences of asphalt mixtures.

摘要

可靠地评估沥青粘合剂的老化状况对于选择材料和预测路面的沥青性能变化非常重要。然而，沥青粘合剂随老化的表观性质变化受老化条件的影响。在这项研究中，三种老化处理方法应用于五种类型的沥青粘合剂，最长的老化处理持续时间为1.5年。系统地测试了在老化处理过程中获得的沥青粘合剂样品的动态流变性能​​。发现沥青粘合剂的表观老化敏感性受老化条件的影响。在更“自然”的条件下进行薄膜时效似乎对加速时效过程非常有效。测试中Christensen-Anderson模型和W​​illiams-Landel-Ferry方程系数的变化表明，可以通过实验室测试可靠地预测粘合剂在长期老化过程中的动态流变特性。这取决于已经过人工老化以通过“喷射”反应阶段的粘合剂，以及在更“自然”的老化条件下从“稳定”反应阶段收集的数据点。为了预测沥青路面在人行道上的老化，还需要进行其他研究来考虑沥青混合物的影响。这取决于已经过人工老化以通过“喷射”反应阶段的粘合剂，以及在更“自然”的老化条件下从“稳定”反应阶段收集的数据点。为了预测沥青路面在人行道上的老化，还需要进行其他研究来考虑沥青混合物的影响。这取决于已经过人工老化以通过“喷射”反应阶段的粘合剂，以及在更“自然”的老化条件下从“稳定”反应阶段收集的数据点。为了预测沥青路面在人行道上的老化，还需要进行其他研究来考虑沥青混合物的影响。