再生沥青混合料路面材料及结构研究

发布时间：2018-06-25 00:07

  本文选题：再生沥青混合料 + 路用性能　； 参考：《重庆交通大学》2015年硕士论文

【摘要】：作为一种特殊的沥青混合料,再生沥青混合料的材料性能及在路面结构中的实际路用性能是一个重要的研究方向。为研究上述问题,本文通过室内试验对比研究了新拌AC-25沥青混合料和掺加30%RAP的再生AC-25混合料的永久变形性能和水稳性能;通过室内试验、理论分析和模型计算研究了两种混合料在路面结构中的疲劳行为,得到了不同条件下的疲劳规律,通过计算不同温度、轴载下的路面结构疲劳损伤度,预估路面的疲劳寿命。得出了以下主要结论:1)通过室内试验分析了两种混合料的永久变形性能和水稳性能,发现再生料的永久变形性能优于新拌料,且都能满足规范要求;两种混合料的水稳定性均满足规范要求,但不同试验方法结果存在差异。2)进行了郑州地区沥青路面温度分布研究和轴载分布研究。温度分布研究显示,郑州地区沥青路面所处的温度区间以8℃~23℃为主,38℃以上高温和2.5℃以下低温情况较少;研究采用中心城市近郊干线交通轴载分布为郑州地区交通轴载分布,以2t为轴重区间将轴重范围划分为10个轴载等级,发现轴重区间2-14t占了整个轴载分布的90%左右。3)对再生料和新拌料进行了间接拉伸疲劳试验,发现新拌料的抗疲劳破坏性能优于再生混合料,再生料对应力的敏感性较低;计算了试件中部的横向拉应变,拟合出新拌、再生混合料去除温度影响的应变疲劳方程分别为80.10022.0-N=ε、88.10009.0-N=ε。4)建立了路面结构ANSYS模型,计算了面层底部的最大拉应变,发现同等轴载等级下,随着温度的升高面层底部拉应变逐渐增大;同等温度区间下,随着轴载的增大面层底拉应变亦逐渐增大。5)对新拌AC-25混合料的疲劳方程和再生AC-25应变疲劳方程作出修正并结合疲劳累积损伤理论预估两种混合料路面的疲劳寿命分别为13.12年、11.52年。
[Abstract]:As a special asphalt mixture, the material performance of recycled asphalt mixture and the actual pavement performance in pavement structure is an important research direction. In order to study the above problems, the permanent deformation and water stability of fresh AC-25 asphalt mixture and recycled AC-25 mixture mixed with 30 rap were studied through laboratory tests. The fatigue behavior of two kinds of mixtures in pavement structure is studied by theoretical analysis and model calculation. The fatigue law under different conditions is obtained. The fatigue damage degree of pavement structure under different temperature and axial load is calculated and the fatigue life of pavement is predicted. The main conclusions are as follows: 1) the permanent deformation and water stability of the two mixtures are analyzed through laboratory tests. It is found that the permanent deformation performance of the recycled mixture is better than that of the fresh mixture, and both of them can meet the requirements of the specifications. The water stability of the two mixtures meets the requirements of the specifications, but the results of different test methods are different (.2) the temperature distribution and axial load distribution of asphalt pavement in Zhengzhou area are studied. The research of temperature distribution shows that the temperature range of asphalt pavement in Zhengzhou area is mainly above 38 鈩，

本文编号：2063603