冻融循环对沥青路面裂缝生长的影响研究

Study on the Influence of Freeze-Thaw Cycle on Crack Growth of Asphalt Pavement

摘要: 为了提升沥青路面的使用性能，降低冻融对裂缝乃至对沥青路面健康状况的影响，课题组选取长春市为代表，实地考察道路裂缝状况，分析自然条件下裂缝各项指标之间的关系，建立以宽度、深度、长度为变量的三维裂缝评价体系。调查长春市年气温状况，确定冻融循环温度及循环周期，设立冻融试验，利用控制变量法分别讨论裂缝初始宽度、深度和长度对裂缝在冻融作用下的生长情况的影响，建立了裂缝宽度扩展比指标，对裂缝进行鉴别、预测和评价。结果表明：裂缝宽度扩展比随裂缝初始宽度的减小、裂缝初始长度的增大，裂缝初始深度的增大而增大，利用裂缝宽度、深度和长度可推知裂缝宽度扩展比，进而可对裂缝进行预测，可用于裂缝养护预测。

Abstract: In order to improve the performance of asphalt pavement and reduce the impact of freezing and thawing on cracks and even on the health of asphalt pavement, the research team selected Chang-chun City as the representative to investigate the road crack conditions and analyze the relation-ship between crack indicators under natural conditions, and established a three-dimensional crack evaluation system with width, depth and length as variables to investigate the annual temperature of Changchun City, determine the freezing and thawing cycle temperature and cycle, establish a freeze-thaw test, and use the control variable method to discuss the influence of initial crack width, depth and length on the growth of crack under freezing and thawing, and establish a index of crack width expansion ratio identify, predict and evaluate the fracture. The results show that the crack width expansion ratio increases with the initial width of the crack, the initial length of the crack, and the initial depth of the crack increase. The crack width, depth and length can be used to infer the crack width expansion ratio, and then the crack can be forecasted to be used for crack maintenance predictions.