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纳米炭黑环氧树脂基复合材料应变和裂缝感知特性研究
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摘要
结构健康监测是目前土木工程领域的研究热点,要实现对大型土木工程的健康监测需要灵敏度高、稳定性及耐久性好的传感器。本文从工程需求出发,系统地研究炭黑/环氧树脂基传感器的电学和力电性能,并将传感器埋入钢筋混凝土构件中形成智能自监测系统。主要研究内容包括:
     首先,以电阻率的平均值和变异系数作为评价指标,并结合扫描电镜图片,分析研究搅拌时间和偶联剂表面改性对炭黑粉体在环氧树脂基体中分散性的影响,并进一步研究炭黑在环氧树脂基体中分散性对炭黑/环氧树脂基块体传感器力电性能的影响,从而确定传感器试件制备的基本工艺;通过分析其所形成电场的差异,比较不同电极对传感器电学及力电性能的影响,确定最佳的电极形式。
     其次,通过比较掺加不同直径和结构炭黑的环氧树脂基块体传感器的伏安特性和力电性能,分析炭黑直径和结构对传感器力电影响的机理;研究环氧树脂基块体传感器在循环荷载下的力电性;进一步研究环向约束下炭黑/环氧树脂块体传感器在静载和循环荷载下的力电性能,找到提高炭黑/环氧树脂基块体传感器力灵敏度的途径。
     制备炭黑/环氧树脂基单电极和多电极薄膜传感器,研究炭黑掺量对单电极薄膜传感器电阻率和力电性能的影响,揭示其渗流特性;研究不同电极布置形式下单电极薄膜传感器的力电性能;研究单电极薄膜传感器在循环荷载下的力电性能,分析循环荷载作用下薄膜传感器灵敏度系数的变化机理;提出通过在环氧树脂基体中混掺不同直径和结构炭黑改善薄膜传感器在循环荷载下的监测性能的方法;研究多电极薄膜传感器在弯矩作用下的监测性能。
     然后,研究炭黑/环氧树脂基传感器的基本传感特性,包括滞后、时间零漂移、量程、灵敏度、线性度和重复性;研究湿度和温度对传感器性能的影响,提出温度补偿方法;研究加载速度对传感器监测性能的影响。
     最后,将炭黑/环氧树脂基传感器应用于混凝土柱及钢筋混凝土梁形成自监测智能系统。研究环氧树脂基块体传感器对混凝土柱及钢筋混凝土梁受压区压应变的监测,比较传感器测试结果与位移计及同测点的应变片的监测结果;应用多电极薄膜传感器对钢筋混凝土梁受拉区裂缝进行监测,验证了监测系统的可行性。
Structure health monitoring is an attractive topic in civil engineering. It needs sensors with high sensitivity, good stability and durability to carry out health monitoring of civil infrastructure. In this dissertation, according to the requirement of civil engineering, the electrical and electromechanical properties of Carbon Black (CB)/epoxy matrix sensors are systematically researched. The sensors are also embedded in reinforced concrete structure to form self-monitoring system. The main research contents are as follows:
     First, taking the mean value and variation coefficient of resistivity combined with image of Scanning Electron Microscope (SEM) as the evaluating indicators, the influence of stirring time and surface modification of CB on the dispersion of CB in epoxy matrix which affects the electromechanical properties of CB/epoxy sensor is studied and the basic specimen preparation techniques are obtained accordingly. The influence of different type of electrodes on the electrical and electromechanical properties of sensor is studied by analyzing the difference of electric field formed by different type of electrodes and based on which the best type of electrode is selected.
     Second, mechanism of the influence of diameter and structure of CB particles on electromechanical properties of sensor is analyzed by comparing the I-V characteristic and electromechanical properties of sensors containing different diameter and structure of CB. The electromechanical properties of epoxy matrix bulk sensor under cyclic loading are studied. The electromechanical properties of CB/epoxy sensor restricted by surrounding carbon fiber under static and cyclic loading are further studied. The way to increase the sensitivity of CB/epoxy matrix sensor is found.
     Third, the single electrode and multi-electrodes CB/epoxy film sensors are prepared. The influence of CB content on resistivity and electromechanical properties of single electrode film sensors is studied. The percolation characteristic is found in electrical properties of film sensor. The electromechanical properties of film sensors with different type of electrodes are studied. The electromechanical properties of film sensors under cyclic loading are also studied. The reason causing the decrease of sensitivity coefficient of film sensors under cyclic loading is analyzed. Based on the analysis, the monitoring properties of film sensors under cyclic loading are improved by adding the CBs with different diameter and structure. The monitoring properties of multi-electrodes film sensors under bending are studied.
     Fourth, the basic properties of CB/epoxy sensors such as hysteresis, time zero-drift, full-scale values, sensitivity, linearity and repeatability are studied. The influence of temperature and humidity on the monitoring properties of sensors is also studied and the temperature compensation approach is proposed. The influence of loading velocity on the monitoring properties of sensor is investigated too. Finally, the CB/epoxy sensors are used in concrete column and reinforced concrete beam to form self-monitoring system. The compressive strain of concrete column and compressive region in reinforced concrete beam are monitored by epoxy matrix sensor. The monitoring results of epoxy-based sensor are in compliance with the results tested by displacement meter and strain gauges. Meanwhile the cracks in tensile region of reinforced concrete beam are also monitored by multi-electrodes film sensors. The results show that the self-monitoring system has good performance and high feasibility.
引文
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