ABSTRACT

Self-healing of asphalt is assumed to be a flow process where bitumen flows into cracks to close them. Hence, the rheological behaviour of bitumen is one of the main factors affecting self-healing together with damage history, healing duration and pressure (external compressive forces or internal thermal expansion). Bitumen-filler interaction influences the flow and it is hypothesised that the material flowing into cracks during self-healing is a mixture of bitumen, filler and eventually fine aggregates. In the paper, the self-healing ratio was determined by mechanical testing and the self-healing was accelerated by an increase of temperature to 100°C. Material draining from asphalt mortar beams into a horizontal gap, representing a crack, was found to be a mixture of bitumen and aggregates with increasing self-healing observed with increasing bitumen and filler content. For the mortar mixture used in this study, a bitumen content of 5.4 wt% was identified to be the limit for self-healing.

摘要

沥青的自我修复被认为是一个流动过程，其中沥青流入裂缝以闭合裂缝。因此，沥青的流变行为与损伤历史、愈合持续时间和压力（外部压缩力或内部热膨胀）一起是影响自愈的主要因素之一。沥青-填料相互作用影响流动，假设在自愈过程中流入裂缝的材料是沥青、填料和最终细骨料的混合物。在论文中，自愈率是通过机械测试来确定的，而自愈率是通过将温度升高到 100°C 来加速的。材料从沥青砂浆梁排入水平间隙，代表裂缝，发现是沥青和骨料的混合物，随着沥青和填料含量的增加，自愈性增加。对于本研究中使用的砂浆混合物，5.4 wt% 的沥青含量被确定为自愈的极限。