掺加乳化沥青的水泥稳定碎石强度特性及疲劳性能.pdf

掺加乳化沥青的水泥稳定碎石强度特性及疲劳性能 冯军强 （中交第一公路勘察设计研究院有限公司，陕西西安710068 ） 摘要：为了揭示掺加乳化沥青对水泥稳定碎石强度特性及疲劳性能的影响规律，减少半刚性 基层反射裂缝的发生。基于无侧限抗压强度试验、劈裂试验、弯曲试验、抗压回弹模量试验、 四点弯曲疲劳试验，系统研究了不同乳化沥青掺量下水泥稳定碎石混合料的强度特性、力学 性能及抗疲劳性能，拟合回归了水泥稳定碎石混合料强度特性与乳化沥青用量之间的函数关 系，建立了不同失效概率下乳化沥青水泥稳定碎石的疲劳寿命Weibull分布预估模型。试验 结果表明，在水泥稳定碎石中掺入1%~5%的乳化沥青，可使水泥稳定碎石材料具有刚柔并 济的特点，乳化沥青水泥稳定碎石混合料的无侧限抗压强度、劈裂强度、弯拉强度均随着乳 化沥青用量增大呈良好的二次函数关系，即先增后减；乳化沥青水泥稳定碎石混合料干缩系 数随乳化沥青掺量增大呈二次函数关系减小，温缩系数随着乳化沥青用量增呈良好的负线性 关系；乳化沥青水泥稳定碎石混合料的疲劳寿命满足双参数Weibull分布，掺加适宜掺量的 乳化沥青有助于提高水泥稳定碎石混合料的抗疲劳性能，降低疲劳寿命对应变水平的敏感 性，以兼顾水泥稳定碎石强度特性及疲劳性能确定用于水泥稳定碎石混合料的最佳乳化沥青 用量为3% 。 关键词：道路工程；乳化沥青水泥稳定碎石混合料；强度特性；疲劳性能 Strength Characteristics and Fatigue Properties of Cement Stabilized Macadam with Different Dosage Emulsified Asphalt FENGJun-qiang ( CCCC First Highway Consultants Co．，Ltd ．，Xian Shaanxi 710068，China) Abstract: In order to reveal the influence of emulsified asphalt on the strength characteristics and fatigue properties of cement stabilized macadam, the occurrence of reflective cracks in semi-rigid base was reduced. Based on the unconfined compressive strength test, splitting test, bending test, compressive modulus test and four-point bending fatigue test, the strength characteristics of cement stabilized macadam mixture under different emulsified asphalt contents were studied systematically. Performance and anti - fatigue properties. The relationship between the strength characteristics of cement stabilized macadam mixture and the amount of emulsified asphalt was fitted. The Weibull distribution model of fatigue life of emulsified asphalt cement stabilized gravel under different failure probabilities was established. The experimental results show that the incorporation of 1% ~ 5% emulsified asphalt in the cement stabilized macadam can make the