水泥沥青复合胶浆本构模型及细观结构研究

发布时间：2018-04-20 06:14

本文选题：水泥沥青复合胶浆 + 动态力学性能　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：水泥沥青复合砂浆是由水泥、沥青、砂及多种外加剂胶结固化而形成的一种新型有机无机复合材料，目前主要应用于高速铁路无砟轨道结构中，起到支撑、调节及减振三方面的作用。水泥沥青复合胶浆是由水泥和沥青构成的复合结合料，其材料性质将从根本上决定水泥沥青复合砂浆的材料性能。同时水泥沥青复合胶浆在道路养护及半柔性基层结构中也有着广泛的应用。本文针对水泥沥青复合胶浆的动态力学性能开展研究，结合粘弹性理论建立其本构方程，分析水泥沥青复合胶浆力学性能的影响因素，并研究其力学性能的细观机理。基于粘弹性理论建立了描述水泥沥青复合胶浆动态力学性能的本构模型，确定了动态力学性能的实验研究方法。基于三参数固体模型、分数导数模型、广义Kelvin模型及2S2P1D模型，推导了描述水泥沥青复合胶浆动态力学性能的本构模型，采用复模量描述其动态力学行为。利用DMA(Dynamic MaterialAnalysis)动态材料分析方法研究水泥沥青胶浆的动态力学性能，确定了相关的试验条件。基于CAM模型分析了水泥沥青复合胶浆的动态力学性能，并研究了沥青水泥质量比（A/C比）及温度对其动态力学性能的影响。在动态力学性能实验研究的基础上，结合时温等效原理得到了不同基准温度下的主曲线，通过CAM模型对主曲线进行了回归分析。结合CAM模型分析了A/C比及温度对水泥沥青复合胶浆的复模量、相位角及温度敏感性的影响。CAM模型能够较好的拟合水泥沥青复合胶浆的动态力学性能，水泥沥青复合胶浆的力学性能受温度、A/C比及加载频率的影响显著，表现出较强的粘弹性特性。基于动态力学性能实验，建立了水泥沥青复合胶浆的动态本构方程，对比分析了不同本构方程的适用性。分别采用三参数固体模型、广义Kelvin模型、三元件分导模型及“2S2P1D”等粘弹性本构模型对复合胶浆储存模量主曲线进行拟合，进而得到其本构方程。对比分析了A/C比及温度对本构模型参数的影响规律，，分析了水泥沥青复合胶浆的力学性能随A/C比及温度的变化规律。通过本构方程对水泥沥青复合胶浆损耗模量及相位角进行了预测，通过与实验结果的对比，分析了不同本构模型的适用性。在实验研究的基础上，建立了水泥沥青复合胶浆的细观结构模型，分析了其宏观力学性能差异的细观机理。采用SEM、MIP及粒度分析实验分别分析了不同A/C复合胶浆的表观形态、孔结构及水泥水化产物颗粒粒径，提出了复合胶浆细观结构模型，并将其划分为水泥基复合胶浆及沥青基复合胶浆两种类型。分析了细观结构变化对复合胶浆力学性能的影响，提出了复合胶浆沥青膜厚度的计算方法，结合体积参数与原材料性质对水泥沥青复合胶浆的模量进行了预测。
[Abstract]:Cement asphalt composite mortar is a new type of organic-inorganic composite material formed by cement, asphalt, sand and many kinds of admixture cementation. At present, it is mainly used in ballastless track structure of high-speed railway, and plays a supporting role. Regulation and damping of the three aspects of the role. Cement asphalt composite mortar is a composite binder composed of cement and asphalt. Its material properties will fundamentally determine the material performance of cement asphalt composite mortar. At the same time, cement asphalt compound mortar is also widely used in road maintenance and semi-flexible base structure. In this paper, the dynamic mechanical properties of cement asphalt composite mortar are studied. The constitutive equation of cement asphalt composite mortar is established in combination with viscoelastic theory. The influencing factors of cement asphalt composite mortar mechanical properties are analyzed, and the meso-mechanism of its mechanical properties is studied. Based on the viscoelastic theory, a constitutive model describing the dynamic mechanical properties of cement asphalt composite mortar was established, and the experimental research method of dynamic mechanical properties was determined. Based on the three-parameter solid model, fractional derivative model, generalized Kelvin model and 2S2P1D model, the constitutive model for describing the dynamic mechanical properties of cement asphalt composite mortar is derived. The dynamic mechanical behavior of cement asphalt composite mortar is described by complex modulus. The dynamic mechanical properties of cement asphalt mortar were studied by DMA(Dynamic material Analysis method, and the relevant test conditions were determined. Based on CAM model, the dynamic mechanical properties of cement asphalt composite mortar were analyzed, and the effects of mass ratio of asphalt cement to A / C ratio and temperature on its dynamic mechanical properties were studied. Based on the experimental study of dynamic mechanical properties and the principle of time-temperature equivalence, the principal curves at different reference temperatures are obtained, and the main curves are regressed by CAM model. The effects of A / C ratio and temperature on the complex modulus, phase angle and temperature sensitivity of cement asphalt composite mortar were analyzed by using CAM model. The mechanical properties of cement asphalt composite mortar are significantly affected by the ratio of temperature to A / C and the loading frequency, showing strong viscoelastic properties. Based on the dynamic mechanical property experiment, the dynamic constitutive equation of cement asphalt composite mortar was established, and the applicability of different constitutive equation was compared and analyzed. The three parameter solid model, the generalized Kelvin model, the three element fractional conductance model and the "2S2P1D" viscoelastic constitutive model were used to fit the main curve of storage modulus of composite mortar, and the constitutive equation was obtained. The effects of A / C ratio and temperature on the constitutive model parameters were compared and the variation of mechanical properties of cement asphalt composite mortar with A / C ratio and temperature was analyzed. The loss modulus and phase angle of cement asphalt composite mortar were predicted by constitutive equation, and the applicability of different constitutive models was analyzed by comparing with the experimental results. On the basis of experimental study, the meso-structure model of cement asphalt composite mortar was established, and the meso-mechanism of the difference of its macroscopic mechanical properties was analyzed. The apparent morphology, pore structure and particle size of cement hydration products of different A / C composite pastes were analyzed by SEMMAP and particle size analysis experiments, and the meso-structure model of composite paste was proposed. It can be divided into two types: cement-based composite slurry and asphalt-based composite slurry. The influence of microstructure change on the mechanical properties of composite mortar was analyzed. The method of calculating the thickness of composite asphalt film was put forward, and the modulus of cement asphalt composite mortar was predicted by combining volume parameter and raw material property.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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