冻融循环作用下水泥沥青复合胶浆力学性能研究
发布时间：2018-10-25 06:09
【摘要】：水泥沥青复合胶浆(简称CA复合胶浆)是由水泥、乳化沥青及多种外加剂经过胶结硬化形成的一种有机-无机复合胶结材料。目前CA复合胶浆主要应用在高速铁路板式无砟轨道结构及半柔性路基路面材料之中。冻融循环作用会影响到CA复合胶浆的宏观力学性能,进而影响到水泥沥青复合砂浆及半柔性路面材料的服役性能。随着我国高寒地区哈大高铁的开通,CA复合胶浆的冻融耐久性问题已成为目前研究的重点。鉴于以上的工程背景,本文的主要研究内容如下。首先,建立了CA复合胶浆的粘弹性本构模型及方程,确定了冻融作用下CA复合胶浆力学性能的试验方法。推导了CA复合胶浆的复模量及蠕变柔量的表达式,确定了CA复合胶浆的材料配比。研究确定了CA复合胶浆静态力性能、动态力学性能及冻融循环的试验方法,分析了快速冻融条件下CA复合胶浆相对动弹模量及质量损失规律。其次,建立冻融作用下CA复合胶浆的静态本构方程,分析了冻融循环、温度及配比等因素对其力学性能的影响规律。基于不同冻融次数与温度下CA复合胶浆的蠕变试验,结合广义Kevin模型及分数导数模型建立了本构方程,分析了材料瞬时弹性模量、粘弹比例系数等材料性能参数随冻融次数的变化规律,分析了温度及材料配比等因素对CA复合胶浆力学性能的耦合影响。再次,基于动态频率扫描试验,建立了冻融作用下CA复合胶浆的动态本构方程,分析了动态力学性能的影响因素,采用分数导数模型及3链Kevin模型描述实际频率范围内材料动态力学行为,分析瞬时弹性模量、粘弹比例系数的变化趋势;采用13链Kevin模型描述扩展频率范围内材料动态力学行为,分析瞬时弹性模量、相位角等参数的变化规律。研究了温度及材料配比等因素对CA复合胶浆动态力学性能的影响。最后,建立了CA复合胶浆蠕变损伤的本构方程,分析了冻融循环作用下孔隙结构的演化规律。研究了考虑材料损伤条件下材料力学性能参数的变化规律,分析得到了CA复合胶浆力学性能参数随冻融次数变化的预测公式。采用压汞试验分析了CA复合胶浆经过冻融循环作用后孔隙结构变化规律,初步分析了冻融循环作用下CA复合胶浆宏观力学性能的演化机理。
[Abstract]:Cement asphalt composite paste (CA compound cement) is an organic-inorganic compound cementing material formed by cement, emulsified asphalt and various admixtures. At present, CA compound mortar is mainly used in slab ballastless track structure and semi-flexible subgrade and pavement materials of high speed railway. The freeze-thaw cycle will affect the macroscopic mechanical properties of CA composite mortar, and then affect the service performance of cement asphalt composite mortar and semi-flexible pavement material. With the opening of high-speed railway in high cold region of China, the problem of freeze-thaw durability of CA composite mortar has become the focus of current research. In view of the above engineering background, the main contents of this paper are as follows. Firstly, the viscoelastic constitutive model and equation of CA composite mortar are established, and the test method of mechanical properties of CA composite mortar under freeze-thaw action is determined. The expressions of complex modulus and creep compliance of CA composite mortar were derived, and the material ratio of CA composite mortar was determined. The test methods of static mechanical properties, dynamic mechanical properties and freeze-thaw cycles of CA composite pastes are studied. The relative dynamic modulus and mass loss of CA composite pastes under rapid freeze-thaw conditions are analyzed. Secondly, the static constitutive equation of CA composite slurry under freeze-thaw was established, and the influence of freezing and thawing cycle, temperature and ratio on its mechanical properties was analyzed. Based on the creep tests of CA composite mortar at different freeze-thaw times and temperatures, the constitutive equation was established by combining the generalized Kevin model and fractional derivative model, and the instantaneous elastic modulus of the material was analyzed. The influence of temperature and material ratio on the mechanical properties of CA composite mortar was analyzed. Thirdly, based on the dynamic frequency scanning test, the dynamic constitutive equation of CA composite paste under freeze-thaw is established, and the influence factors of dynamic mechanical properties are analyzed. The fractional derivative model and 3-strand Kevin model are used to describe the dynamic mechanical behavior of the material in the actual frequency range, and the changing trend of instantaneous elastic modulus and viscoelastic proportional coefficient is analyzed. The 13 chain Kevin model is used to describe the dynamic mechanical behavior of the material in the extended frequency range, and the variation law of the instantaneous elastic modulus and phase angle is analyzed. The effects of temperature and material ratio on the dynamic mechanical properties of CA composite paste were studied. Finally, the constitutive equation of creep damage of CA composite mortar is established, and the evolution of pore structure under freeze-thaw cycle is analyzed. The variation law of mechanical properties of CA composite mortar under the condition of material damage was studied. The prediction formula of the mechanical properties of CA composite mortar with the number of freeze-thaw was obtained. The pore structure changes of CA composite mortar after freeze-thaw cycle were analyzed by mercury injection test, and the evolution mechanism of macroscopic mechanical properties of CA composite mortar under freeze-thaw cycle was preliminarily analyzed.
【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】：2015
【分类号】：U414
本文编号：2292837
[Abstract]:Cement asphalt composite paste (CA compound cement) is an organic-inorganic compound cementing material formed by cement, emulsified asphalt and various admixtures. At present, CA compound mortar is mainly used in slab ballastless track structure and semi-flexible subgrade and pavement materials of high speed railway. The freeze-thaw cycle will affect the macroscopic mechanical properties of CA composite mortar, and then affect the service performance of cement asphalt composite mortar and semi-flexible pavement material. With the opening of high-speed railway in high cold region of China, the problem of freeze-thaw durability of CA composite mortar has become the focus of current research. In view of the above engineering background, the main contents of this paper are as follows. Firstly, the viscoelastic constitutive model and equation of CA composite mortar are established, and the test method of mechanical properties of CA composite mortar under freeze-thaw action is determined. The expressions of complex modulus and creep compliance of CA composite mortar were derived, and the material ratio of CA composite mortar was determined. The test methods of static mechanical properties, dynamic mechanical properties and freeze-thaw cycles of CA composite pastes are studied. The relative dynamic modulus and mass loss of CA composite pastes under rapid freeze-thaw conditions are analyzed. Secondly, the static constitutive equation of CA composite slurry under freeze-thaw was established, and the influence of freezing and thawing cycle, temperature and ratio on its mechanical properties was analyzed. Based on the creep tests of CA composite mortar at different freeze-thaw times and temperatures, the constitutive equation was established by combining the generalized Kevin model and fractional derivative model, and the instantaneous elastic modulus of the material was analyzed. The influence of temperature and material ratio on the mechanical properties of CA composite mortar was analyzed. Thirdly, based on the dynamic frequency scanning test, the dynamic constitutive equation of CA composite paste under freeze-thaw is established, and the influence factors of dynamic mechanical properties are analyzed. The fractional derivative model and 3-strand Kevin model are used to describe the dynamic mechanical behavior of the material in the actual frequency range, and the changing trend of instantaneous elastic modulus and viscoelastic proportional coefficient is analyzed. The 13 chain Kevin model is used to describe the dynamic mechanical behavior of the material in the extended frequency range, and the variation law of the instantaneous elastic modulus and phase angle is analyzed. The effects of temperature and material ratio on the dynamic mechanical properties of CA composite paste were studied. Finally, the constitutive equation of creep damage of CA composite mortar is established, and the evolution of pore structure under freeze-thaw cycle is analyzed. The variation law of mechanical properties of CA composite mortar under the condition of material damage was studied. The prediction formula of the mechanical properties of CA composite mortar with the number of freeze-thaw was obtained. The pore structure changes of CA composite mortar after freeze-thaw cycle were analyzed by mercury injection test, and the evolution mechanism of macroscopic mechanical properties of CA composite mortar under freeze-thaw cycle was preliminarily analyzed.
【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】：2015
【分类号】：U414
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