成型工艺对水泥稳定级配碎石混合料宏细观性能的影响  

Effect of Molding Process on the Macro and Micro Performance of Cement-stabilized Graded Crushed Stone Mixture

作　　者：方乾 FANG Qian(Jiang Xi Communications Design and Research Institute Co.Ltd.,Nanchang 330200,China)

机构地区：[1]江西省交通设计研究院有限责任公司,南昌330200

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第6期1230-1236,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：基于7 d无侧限抗压强度试验与三分点加载疲劳试验,对比分析了静压成型、振动压实和现场压实试件的力学强度与疲劳性能差异,进而基于工业CT的无损检测技术和用数字图像处理技术的三维重构功能,研究了试件成型方法对水泥稳定碎石混合料内部粗集料取向角和微细观三维空隙结构的影响规律.结果表明:室内振动成型密度为静压成型密度的1.011~1.035倍,振动压实试件测试的压实度、无侧限抗压强度和疲劳寿命与现场压实更接近;水泥稳定级配碎石混合料内部粗集料的取向角概率分布及内部微细观空隙等效直径的概率分布均符合Lorentz函数模型,振动压实和现场压实水泥稳定碎石中的粗集料更接近“平躺”状态,粗集料分布状态更加稳定.Based on the 7-day unconfined compressive strength test and three-point loading fatigue test,the differences of mechanical strength and fatigue performance of static pressure forming,vibration compaction and field compaction specimens were compared and analyzed.Based on the nondestructive testing technology of industrial CT and the three-dimensional reconstruction function of digital image processing technology,the influence law of specimen forming method on the orientation angle of coarse aggregate and micro-three-dimensional void structure in cement stabilized macadam mixture was studied.The results show that the density of indoor vibration compaction is(1.011~1.035)times that of static compaction,and the compactness,unconfined compressive strength and fatigue life of vibration compaction specimens are closer to those of on-site compaction.The probability distribution of orientation angle of coarse aggregate in cement stabilized graded macadam mixture and the probability distribution of equivalent diameter of internal micro-voids all conform to Lorentz function model,and the coarse aggregate in vibration compaction and field compaction is closer to the“flat”state,and the distribution state of coarse aggregate is more stable.

关 键 词：道路工程 水泥稳定碎石 静压成型 振动压实 现场压实 力学性能 疲劳性能 集料取向角 微细观空隙结构 

分 类 号：U414[交通运输工程—道路与铁道工程]