纳米凹凸棒石粘土对水泥基材料物理力学及耐久性影响研究

发布时间：2018-01-05 04:25

本文关键词：纳米凹凸棒石粘土对水泥基材料物理力学及耐久性影响研究　出处：《大连海事大学》2017年硕士论文　论文类型：学位论文

【摘要】：以水泥作为胶凝材料的砂浆、混凝土被广泛应用于各种建筑结构中。但因受恶劣自然环境、海水侵蚀、道路除冰盐、工业环境等影响,导致材料过早劣化,致使大多数建筑结构远未达到其设计使用寿命。掺入矿物掺合料是提高水泥基材料耐久性的主要技术途径之一。纳米凹凸棒石粘土(Attapulgite)属于纳米材料且具有特殊纤维状棒晶结构,能够改变水泥基材料物理力学性能,为探索高性能水泥基材料耐久性研究开辟了新的思路。结合国内外现有纳米凹凸棒石粘土对水泥基材料性能影响研究现状,在国家自然科学基金(项目编号:51578099)的资助下,本文就纳米凹凸棒石粘土对水泥基材料物理力学和耐久性的影响展开了试验研究,主要包括以下几个方面:(1)纳米凹凸棒石粘土改性与水中分散性研究。通过控制煅烧温度提高纳米凹凸棒石粘土化学活性,结合扫描电镜和X射线衍射图谱分析锻烧对其微观结构和组分的影响;通过盐酸酸化、十八烷基三甲基氯化铵表面活化和超声分散研究纳米凹凸棒石粘土在水中分散性能。(2)纳米凹凸棒石粘土对硅酸盐水泥水化性能影响。通过测试化学结合水含量、孔溶液pH值、气孔含量以及电镜扫描来分析纳米凹凸棒石粘土对硅酸盐水泥水化性能和微观结构的影响;建立水泥浆体抗压强度与化学结合水含量、抗折强度与气孔含量之间的关系。(3)纳米凹凸棒石粘土对水泥胶砂性能影响。通过测试流动度、抗折强度、抗压强度和氯离子扩散系数来分析不同纳米凹凸棒石粘土掺量对水泥胶砂性能的影响。(4)纳米凹凸棒石粘土对混凝土物理力学和耐久性影响。分析煅烧纳米凹凸棒石粘土对混凝土抗压强度、电阻率、抗冻性和抗氯离子扩散性的影响:采用二电极法、四电极法和电阻率测试仪分析三种测试方法对测试结果的影响;建立混凝土电阻率与氯离子扩散系数之间的变化关系:基于偏微分方程和有限元理论分析氯离子在圆柱形桥墩中分布规律。
[Abstract]:The mortar cement as cementitious material, concrete is widely used in a variety of building structures. But due to the harsh natural environment, water erosion, road deicing salt, industrial and environmental impact, leading to premature deterioration, resulting in most of the building structure is far from its designed life. With the addition of mineral admixture is one of the main methods to improve the durability of cement-based materials. Nano attapulgite Shi Niantu (Attapulgite) belongs to the nanometer material and has a special fibrous rod crystal structure, can change the physical and mechanical properties of cement-based materials, in order to explore the high performance opens up a new way of research on the durability of cement-based materials. Combined with the domestic and foreign existing nano attapulgite clay on properties of cement based materials in the current situation, the National Natural Science Foundation (No. 51578099) supported by the nano attapulgite clay on physical cement-based material Effect of mechanical and durability are studied experimentally, mainly including the following aspects: (1) nano attapulgite clay modification and dispersion in water. By controlling the calcination temperature increase of nano attapulgite clay chemical activity, analysis of effect of calcination on the microstructure and composition of the combination of scanning electron microscopy and X ray diffraction atlas; by hydrochloric acid, eighteen alkyl three methyl ammonium chloride surfactant and ultrasonic dispersion of nano attapulgite clay dispersion in water. (2) effect of nano attapulgite clay on properties of Portland cement hydration. By testing the chemical combined water content, pore solution pH value, porosity content and SEM to analyze the impact of nano attapulgite clay on properties of Portland cement hydration and microstructure of cement paste; the compressive strength and the chemical combined water content, the flexural strength and porosity content between the closed Line. (3) effect of nano attapulgite clay on properties of cement mortar. By testing the fluidity, flexural strength, compressive strength and chloride ion diffusion coefficient to analyze the effects of different nano attapulgite clay additive on the performance of cement mortar. (4) nano attapulgite clay influence coagulation soil physical mechanics and durability. Analysis of calcined nano attapulgite clay on concrete compressive strength, resistivity, frost resistance and chloride ion diffusion effect: using two electrode method, analysis of three kinds of test methods on the test results of the impact test instrument and electrical resistivity of four electrodes; establish the resistivity of concrete and chloride ion diffusion relationship the coefficient between partial differential equations and finite element analysis of chloride ion distribution in cylindrical Pier Based on.

【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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