不同级配结构水泥稳定砂砾材料CT试验分析  

The industrial CT experiment of different grading structure cement-stabilized sand gravel materials

作　　者：杨三强[1,2] 洪亮 纪伦[2] 邢超[2] 

机构地区：[1]新疆交通科学研究院干旱荒漠区公路工程技术交通行业重点实验室,新疆乌鲁木齐830000 [2]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150006

出　　处：《交通科学与工程》2013年第4期1-7,共7页Journal of Transport Science and Engineering

基　　金：交通行业重点实验室应用基础研究项目(2011319797100)

摘　　要：利用工业CT三维扫描成像技术,进行了3类典型级配结构对比试验,分析了不同结构水泥稳定砂砾材料在过载条件下破坏前、后的微观特性.研究结果表明:悬浮密实结构、骨架密实结构及骨架空隙结构这3种典型级配结构的空隙率主要受最大空隙体积的影响;骨架密实型结构大粒径骨料破坏后形成的较小骨料和胶结料形成的整体仍有一定的强度,该结构抗疲劳破坏潜力较大;优化水泥稳定砂砾基层级配结构可有效增强其抗破坏能力.该研究成果对干旱荒漠区公路工程施工和设计具有指导作用.Using industrial computed tomography （CT）, three-dimensional （3D） laser imaging technology grading for three kinds of typical structure is studied. Different structure cement-stabilized sand gravel materials are analyzed in an overload condition of microcosmic character. Results show that suspend-dense structure （SDS）, framework- dense structure（FDS） and framework-void structure（FVS）of three kinds of typical structure of the porosity was mainly affected by the maximum gap. FDS inside the larger particle size of aggregates~ damage after the smaller aggregates with binder to form the overall aggregates has a certain strength. Fatigue resistance with this kind of structure is better. The optimization of the structure of cement stabilized gravel base can effec- tively enhance its ability against damage. The above results can be as a guidance for arid ~desert region highway engineering construction and design.

关 键 词：级配结构 水泥稳定砂砾 CT试验 空隙分布 

分 类 号：U416.1[交通运输工程—道路与铁道工程]