钢纤维-碳纳米管导电混凝土的受弯机敏性试验研究

发布时间：2018-03-30 23:35

本文选题：碳纳米管　切入点：导电混凝土　出处：《混凝土》2017年09期

【摘要】：研究了钢纤维-碳纳米管导电混凝土在受弯过程中的荷载-挠度-电阻变化率之间的关系,研究发现:单掺钢纤维可以提高混凝土的导电性,并可以监测混凝土受弯开裂后的力-电效应,但导电能力与受弯过程的机敏性均较差。引入碳纳米管可以改善钢纤维的搭接效率,同时亦可以改善钢纤维表面的界面过渡区,从而使钢纤维混凝土受弯过程的机敏性得到了明显提升。碳纳米管的导电效率明显高于钢纤维,钢纤维-碳纳米管导电混凝土的受弯机敏性随着碳纳米管掺量的提高而显著提高,但是单纯提高钢纤维的掺量并无法明显改善混凝土材料的受弯机敏性。钢纤维-碳纳米管导电混凝土的电阻变化率-挠度曲线可以采用一次线性函数进行拟合,试件挠度与电阻变化率之间的线性相关性较好。
[Abstract]:The relationship between load-deflection and resistance change rate of steel fiber-carbon nanotube conductive concrete during bending is studied. It is found that steel fiber alone can improve the conductivity of concrete.The mechanical-electric effect of concrete after flexural cracking can be monitored, but the electrical conductivity and the cleverness of bending process are poor.The introduction of carbon nanotubes can improve the lapping efficiency of steel fiber and the interface transition zone on the surface of steel fiber, thus improving the sensitivity of steel fiber concrete in bending process.The conductive efficiency of carbon nanotubes is obviously higher than that of steel fibers. The flexural sensitivity of steel fiber-carbon nanotube conductive concrete increases with the increase of carbon nanotube content.But simply increasing the content of steel fiber can not obviously improve the flexural sensitivity of concrete.The resistance rate-deflection curve of steel fiber-carbon nanotube conductive concrete can be fitted by a linear function, and there is a good linear correlation between the deflection of the specimen and the resistance change rate.
【作者单位】：华中科技大学武昌分校城市建设学院;华东交通大学理工学院土木建筑学院;
【基金】：国家自然科学基金青年基金项目(51168015)
【分类号】：TU528

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