【摘要】：水泥瀝青復(fù)合膠漿(簡稱CA復(fù)合膠漿)是由水泥、乳化瀝青及多種外加劑經(jīng)過膠結(jié)硬化形成的一種有機-無機復(fù)合膠結(jié)材料。目前CA復(fù)合膠漿主要應(yīng)用在高速鐵路板式無砟軌道結(jié)構(gòu)及半柔性路基路面材料之中。凍融循環(huán)作用會影響到CA復(fù)合膠漿的宏觀力學(xué)性能,進而影響到水泥瀝青復(fù)合砂漿及半柔性路面材料的服役性能。隨著我國高寒地區(qū)哈大高鐵的開通,CA復(fù)合膠漿的凍融耐久性問題已成為目前研究的重點。鑒于以上的工程背景,本文的主要研究內(nèi)容如下。首先,建立了CA復(fù)合膠漿的粘彈性本構(gòu)模型及方程,確定了凍融作用下CA復(fù)合膠漿力學(xué)性能的試驗方法。推導(dǎo)了CA復(fù)合膠漿的復(fù)模量及蠕變?nèi)崃康谋磉_式,確定了CA復(fù)合膠漿的材料配比。研究確定了CA復(fù)合膠漿靜態(tài)力性能、動態(tài)力學(xué)性能及凍融循環(huán)的試驗方法,分析了快速凍融條件下CA復(fù)合膠漿相對動彈模量及質(zhì)量損失規(guī)律。其次,建立凍融作用下CA復(fù)合膠漿的靜態(tài)本構(gòu)方程,分析了凍融循環(huán)、溫度及配比等因素對其力學(xué)性能的影響規(guī)律�；诓煌瑑鋈诖螖�(shù)與溫度下CA復(fù)合膠漿的蠕變試驗,結(jié)合廣義Kevin模型及分?jǐn)?shù)導(dǎo)數(shù)模型建立了本構(gòu)方程,分析了材料瞬時彈性模量、粘彈比例系數(shù)等材料性能參數(shù)隨凍融次數(shù)的變化規(guī)律,分析了溫度及材料配比等因素對CA復(fù)合膠漿力學(xué)性能的耦合影響。再次,基于動態(tài)頻率掃描試驗,建立了凍融作用下CA復(fù)合膠漿的動態(tài)本構(gòu)方程,分析了動態(tài)力學(xué)性能的影響因素,采用分?jǐn)?shù)導(dǎo)數(shù)模型及3鏈Kevin模型描述實際頻率范圍內(nèi)材料動態(tài)力學(xué)行為,分析瞬時彈性模量、粘彈比例系數(shù)的變化趨勢;采用13鏈Kevin模型描述擴展頻率范圍內(nèi)材料動態(tài)力學(xué)行為,分析瞬時彈性模量、相位角等參數(shù)的變化規(guī)律。研究了溫度及材料配比等因素對CA復(fù)合膠漿動態(tài)力學(xué)性能的影響。最后,建立了CA復(fù)合膠漿蠕變損傷的本構(gòu)方程,分析了凍融循環(huán)作用下孔隙結(jié)構(gòu)的演化規(guī)律。研究了考慮材料損傷條件下材料力學(xué)性能參數(shù)的變化規(guī)律,分析得到了CA復(fù)合膠漿力學(xué)性能參數(shù)隨凍融次數(shù)變化的預(yù)測公式。采用壓汞試驗分析了CA復(fù)合膠漿經(jīng)過凍融循環(huán)作用后孔隙結(jié)構(gòu)變化規(guī)律,初步分析了凍融循環(huán)作用下CA復(fù)合膠漿宏觀力學(xué)性能的演化機理。
[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.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U414

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