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基于马歇尔试验、工业CT的无损检测技术以及VG软件的三维重构功能,系统研究了0,1%,1.5%,2%,2.5%,3%共6种水泥掺量下乳化沥青冷再生混合料的强度特性、空隙率大小、最可几空隙、空隙分形特征的变化规律。分析了最可几空隙、空隙分形特征的数学模型表征,并建立了细微观空隙分布特征与力学性能之间的回归关系。试验结果表明:水泥掺量对乳化沥青冷再生混合料细微观空隙分布特征有显著的影响,乳化沥青冷再生混合料空隙体积与其概率分布之间具有较好的洛伦兹分布关系,采用最可几空隙和空隙分形维数可较好地表征水泥掺量对乳化沥青冷再生混合料细微观空隙特征的影响;随着水泥掺量增大,最可几空隙体积减小;掺加水泥改变了乳化沥青冷再生混合料的整体空隙形状特征,且水泥掺量越大,空隙形状改变越明显;水泥改变了冻融循环作用下乳化沥青冷再生混合料的空隙衰变过程。
Based on the Marshall experiment, the nondestructive testing technology of industrial CT and the 3D reconstruction function of VG software, six kinds of emulsified asphalt cold reclaimed and mixed at the cement content of 0, 1%, 1.5%, 2%, 2.5% and 3% The strength characteristics of the material, the size of the voids, the most probable voids, the fractal characteristics of the voids. The mathematical model characterization of the most probable voids and fractal features of voids was analyzed, and the regression relationship between the microscopic voids distribution and mechanical properties was established. The experimental results show that cement content has a significant effect on the microscopic pore distribution characteristics of the emulsified asphalt cold recycled mixture. The void volume of the emulsion recycled asphalt mixture has a good Lorentz distribution relationship with the probability distribution, The fractal dimension of several voids and voids could better characterize the effect of cement content on the microscopic void characteristics of the cold recycled mixture of emulsified asphalt. With the increase of cement content, the most voids of voids decreased and the amount of cement added changed Emulsified asphalt cold recycled mixture of the overall shape of the gap shape, and the greater the amount of cement, the more obvious change in the shape of the gap; cement freeze-thaw cycle of cold recycled asphalt mixture of the gap decay process.