梯度温度场下的沥青路面车辙性能分析

Rutting Performance Analysis of Asphalt Pavement at Gradient Temperature Field

为了更加准确的反应沥青路面在服役时的性能,试验采用全厚式车辙试件以保证模拟效果,使用多功能路面材料全寿命分析仪对测试环境进行控制,设置温度梯度以观察温度对沥青路面服役性能的影响,设置紫外光强模拟太阳辐射并产生温度梯度.结果表明,车辙破坏有压密和稳定两个阶段,其他条件相同的情况下,更高的温度会显著降低动稳定度,且车辙破坏进入稳定阶段的时间点更晚.紫外光会在试件中形成显著的梯度温度场,且紫外光强度越高试件中形成的温度场梯度越大.更高的紫外强度会显著降低动稳定度,且车辙破坏进入稳定阶段的时间点更晚.

In order to more accurately reflect the performance of asphalt pavement in service,full-thickness rutting specimens were used in the test to ensure the simulation effect.Meanwhile,the multifunction pavement material life analyzer machine was used to control the test environment,and the UV light intensity was set to simulate solar radiation and produce a temperature gradient,which was used to observe the Asphalt pavement performance.The results show that the rutting damage is composed of two stages：compaction and stabilization.Under the same conditins,the higher temperature will significantly reduce the dynamic stability,results in the late time of rutting damage into the stable phase.UV light will form a significant gradient temperature field in the specimen,and the higher the intensity of the UV light,the higher the temperature gradient will form in the specimen.Higher UV intensity will significantly reduce the dynamic stability,and the time of rutting damage into the stable phase will be later.