【摘要】：混凝土是當(dāng)今建筑業(yè)最重要的建筑材料。它的耐久性是混凝土結(jié)構(gòu)面臨的最大挑戰(zhàn)。以往多采用破壞原有試件的宏觀方法對(duì)混凝土的基本特性進(jìn)行測(cè)試,但這種方法不能從混凝土的細(xì)觀結(jié)構(gòu)來觀測(cè)其性能的變化。 因此,本文采用電化學(xué)阻抗譜方法來測(cè)試混凝土中水泥水化過程的基本特性,對(duì)混凝土中水泥水化過程有了更深入的認(rèn)識(shí)。電化學(xué)阻抗譜方法是目前存在的一種新的實(shí)驗(yàn)工具,混凝土材料可以視為是一種多孔介質(zhì),通過測(cè)定混凝土中孔結(jié)構(gòu)和毛細(xì)結(jié)構(gòu)電解質(zhì)溶液的電性質(zhì),以及研究水泥漿體／集料界面過渡區(qū)電解質(zhì)溶液的電性質(zhì),從而了解混凝土的細(xì)觀結(jié)構(gòu)。電化學(xué)阻抗譜能靈敏地反應(yīng)混凝土中水泥水化過程的細(xì)觀結(jié)構(gòu)的變化,是一種動(dòng)態(tài)測(cè)量混凝土硬化水泥漿體細(xì)觀結(jié)構(gòu)變化的無損的方法。 通過對(duì)混凝土中水泥水化過程的電化學(xué)阻抗譜進(jìn)行測(cè)量,并對(duì)實(shí)測(cè)的數(shù)據(jù)用Origin7.5和ZsimpWin軟件進(jìn)行擬合、分析,通過電化學(xué)阻抗參數(shù)的變化來了解混凝土材料細(xì)觀結(jié)構(gòu)特性的變化情況,說明該方法可用于混凝土基本特性的研究。本文的研究?jī)?nèi)容如下： (1)通過進(jìn)行混凝土中不泥水化過程的電化學(xué)阻抗譜研究,得到水灰比和水化齡期對(duì)混凝土中水泥水化過程的電化學(xué)阻抗譜的影響和混凝土細(xì)觀結(jié)構(gòu)阻抗參數(shù)的變化規(guī)律。 (2)通過對(duì)摻入粉煤灰或礦渣的混凝土中水泥水化過程進(jìn)行電化學(xué)阻抗譜研究,得到不同粉煤灰或礦渣摻量對(duì)混凝土電化學(xué)阻抗譜和細(xì)觀結(jié)構(gòu)參數(shù)的影響。 (3)在所做試驗(yàn)的基礎(chǔ)上,了解了不同粉煤灰或礦渣摻量的混凝土電化學(xué)阻抗譜的隨水化齡期的變化情況。
[Abstract]:Concrete is the most important building material in today's construction industry. Its durability is the biggest challenge to concrete structure. In the past, the macroscopic method of destroying the original specimen was used to test the basic characteristics of concrete, but this method could not observe the change of concrete performance from the microscopic structure of concrete. Therefore, electrochemical impedance spectroscopy is used to test the basic characteristics of cement hydration process in concrete, and a deeper understanding of cement hydration process in concrete has been obtained. Electrochemical impedance spectroscopy (EIS) method is a new experimental tool. Concrete material can be regarded as a porous medium. The electrical properties of electrolyte solution of pore structure and capillary structure in concrete are measured. The electrical properties of electrolyte solution in the transition zone between cement paste and aggregate interface are studied to understand the microstructure of concrete. Electrochemical impedance spectroscopy (EIS) can sensitively reflect the change of meso-structure of cement hydration process in concrete. It is a non-destructive method for dynamic measurement of meso-structure changes of concrete hardened cement paste. By measuring the electrochemical impedance spectrum of cement hydration process in concrete and fitting the measured data with Origin7.5 and ZsimpWin software, The change of microstructure characteristics of concrete materials is studied by the change of electrochemical impedance parameters, which indicates that this method can be used to study the basic properties of concrete. The main contents of this paper are as follows: (1) the electrochemical impedance spectroscopy (EIS) of non-muddy hydration process in concrete is studied. The influence of water-cement ratio and hydration age on the electrochemical impedance spectrum of cement hydration process in concrete and the variation of impedance parameters of concrete meso-structure were obtained. (2) the influence of different amount of fly ash or slag on the electrochemical impedance spectrum and microstructure parameters of concrete was obtained by electrochemical impedance spectroscopy (EIS) study on the hydration process of cement mixed with fly ash or slag. (3) on the basis of the experiment, the change of electrochemical impedance spectrum of concrete with different content of fly ash or slag with hydration age is studied.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU528

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本文編號(hào)：2389378