水化过程中水泥石电阻率演化规律研究

发布时间：2018-03-26 06:24

本文选题：水泥水化　切入点：石膏　出处：《哈尔滨工业大学》2014年硕士论文

【摘要】：水泥作为混凝土组成中最为主要的成分，其水化程度的发展直接关系到混凝土的耐久性和应用于建筑结构的安全性。由于水泥中各组分发生水化反应的速率不同，生成水化产物的种类和含量不同，因而对水泥微观结构的发展和宏观性能的影响程度不同。本文探讨硬化水泥浆体电阻率的演化过程，进而用电阻率法表征选择性水化体系下水泥浆体的水化过程，建立水化进程中电化学特性、宏观强度与微观结构三者间的联系，不断补充完善水泥水化机理。本文首先通过水泥熟料在不同龄期水化过程中电化学参数的变化特征，初步探讨了硬化水泥浆体水化过程中电阻率随时间的变化规律，研究各分析测试方法如差热分析法、红外光谱法、X射线衍射法和强度等方法的适用性和可行性。研究不同石膏种类及掺量对水化过程中电化学性能、物理力学性能的影响。发现由于石膏溶解速率不同，石膏对水泥水化速率的影响不同。在此基础上，研究复合石膏种类及掺量对水泥水化过程的影响，得出复合掺入石膏有助于促进水化速率以及强度持续增长。研究矿物掺合料种类和含量对水泥水化过程的影响，得到掺入矿物掺合料的水泥浆体电阻率和水泥强度发展随掺量的增加而降低。在掺合料对水泥强度的影响探究中，，得到不同掺合料都有其最适掺量。通过本课题的研究将水泥水化过程电化学性能、强度与微观结构联系起来，对水泥基材料性能的监测和评价具有重大意义。
[Abstract]:As the most important component of concrete, the development of hydration degree of cement is directly related to the durability of concrete and the safety of building structure. The types and contents of hydration products are different, so the influence on the development of microstructure and macroscopic properties of cement is different. The evolution process of resistivity of hardened cement paste is discussed in this paper. Furthermore, the hydration process of cement paste under selective hydration system was characterized by resistivity method, and the relationship among electrochemical characteristics, macroscopic strength and microstructure of cement paste in the process of hydration was established, and the hydration mechanism of cement was continuously improved. Based on the characteristics of electrochemical parameters of cement clinker during hydration at different ages, the variation of resistivity with time during hydration of hardened cement paste is preliminarily discussed, and various analytical methods such as differential thermal analysis (DTA) are studied in this paper. The applicability and feasibility of the methods of X-ray diffraction and intensity are discussed in this paper. The effects of different gypsum types and contents on the electrochemical and physical and mechanical properties during hydration are studied. It is found that the gypsum has different effects on the hydration rate of cement due to the different dissolution rate of gypsum. The effects of the type and amount of gypsum on the hydration process of cement were studied. The results show that the addition of gypsum can promote the hydration rate and the strength of cement hydration. The effects of mineral admixture types and contents on cement hydration process are studied. The results show that the resistivity and strength development of cement paste decrease with the increase of the content of mineral admixture. The results show that different admixtures have their optimal content. In this paper, the electrochemical performance, strength and microstructure of cement hydration process are connected, which is of great significance to the monitoring and evaluation of cement based material performance.
【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】：TU528

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