多年冻土地区沥青混合料低温抗裂性能及配合比设计方法研究

【作者】 张毅；

【导师】 胡长顺； 陈拴发；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2004， 硕士

【摘要】 沥青混合料的低温抗裂性能是多年冻土地区沥青路面的关键路用性能之一，老化对其有着重要影响。目前对此的研究和评价方法还较少，本文对短期老化和长期老化后的沥青混合料进行了O℃弯曲蠕变试验和-10℃弯曲试验研究，分析了不同老化状态下沥青混合料的低温抗裂性能。结果表明，老化过程大大降低了沥青混合料的低温抗裂性能，0℃弯曲蠕变试验比-10℃弯曲试验对不同的试验条件的区分度更大，试验误差更小，稳定性更好，可较好地评价沥青混合料的低温抗裂性能。 依据试验研究结果，结合多年冻土地区低温抗裂性、抗老化性和抗冻性等关键性能，提出了多年冻土地区沥青混合料配合比设计方法。与规范马歇尔方法相比，减小了混合料空隙率，舍弃了流值指标，加入了短期老化后0℃弯曲蠕变速率作为沥青混合料老化和低温抗裂性能控制指标，增加了抗冻性检验指标，调整了高温车辙检验的温度。更多还原

【Abstract】 The asphalt mixture’s crack resistance at low temperature is one of the key pavement performances in perennially frozen soil zone, and aging procedure has important effect on it. Presently research and evaluation method on it are very limited. Through bending creep test at 0C and bending test at -10C, this thesis studies the crack resistance at different aging condition. Research shows that the aging procedure will greatly reduce the asphalt mixture’s crack resistance. Research also shows that in different test condition, sensitivity, accuracy, and stability of bending creep test at 0 C are better than that of bending test at -10C. Thus, bending creep test at 0C can preferably evaluate the crack resistance of asphalt mixture at low temperature.Based on the test result, considering the key pavement performances in the perennially frozen soil zone such as crack resistance, aging resistance and freezing resistance, this thesis puts forward the asphalt mixture design method for perennially frozen soil zone. Compared to specification’s Marshell Method, this method reduces percentage of voids value, throws away flow value index. Furthermore, it adds freezing resistance index and bending creep speed at 0C as a control index of aging resistance and crack resistance. Finally, it adjusts the temperature of rut test index.更多还原