模拟动水压力试验条件下的沥青混合料路用性能评价

Evaluation of Asphalt Mixture Pavement Performance under Simulating Hydrodynamic Pressure Test Conditions

以AC-13型密级配沥青混合料为研究对象,借助动水压力模拟试验系统,研究模拟动水压力作用对沥青混合料路用性能的影响及其力学性能变化。研究结果表明:(1)松散的混合料或成型后的混合料试件,经过动水冲刷作用后,试验结果呈现的规律基本保持一致:混合料的高温稳定性、低温抗裂性、水稳定性以及疲劳性能都是随动水作用时间增加呈现先增大后减小的规律。(2)4h前动水压力会提高沥青混合料的整体力学强度;4h后动水压力开始对沥青混合料产生弱化作用,且该作用随着时间的推移逐渐增强,导致混合料路用性能及其力学特性迅速下降。

In this study,AC-13 dense distribution asphalt mixture is taken as the research object.With the help of dynamic water pressure simulation test system,the influence of simulated dynamic water pressure on the pavement performance of asphalt mixture and the change of mechanical properties have been studied.The experimental results have shown that(1)Whether it is a loose mixture or a formed mixture test piece,after the action of dynamic water scouring,the rules of the test results are basically consistent:the high temperature stability,low temperature crack resistance,and water stability of the mixture As well as fatigue performance,it increases first and then decreases with the increase of the action time of water.(2)The hydrodynamic pressure before 4hours will increase the overall mechanical strength of the asphalt mixture;After 4 hours,the dynamic water pressure begins to weaken the asphalt mixture,and the effect gradually increases with the passage of time,resulting in the rapid decline of the performance and mechanical properties of the mixture.