岩土力学2024，Vol.45Issue(7)：2105-2116,12.DOI:10.16285/j.rsm.2023.1277
碳纤维水泥土压电性及传感器性能研究
Study on piezoelectric properties and sensor properties of carbon fiber reinforced soil-cement
林江源 1童立元 1李洪江 1马海洋 1刘文源 1闫鑫1
作者信息
- 1. 东南大学岩土工程研究所,江苏南京 210096
- 折叠
摘要
Abstract
Studies show that adding carbon fiber to concrete to form a conductive network can make concrete feel its own stress,strain,cracks,and damage according to the change of conductive network,and improve the strength and durability of concrete.In view of the self-sensing characteristics of carbon fiber,carbon fiber reinforced cement-based composites are put forward as a new intelligent sensing material.Through unconfined compressive strength test,resistivity test,microscopic test,and model test,the influence of fiber volume fraction and fiber length on unconfined compressive strength and resistivity change rate of carbon fiber reinforced cement-based composites are studied.A carbon fiber reinforced cement-based composites"sensor"is made according to the optimal ratio,which is implanted into cement-based composites components to establish the functional relationship between the sensor resistivity change rate and the stress of cement-based composites components,so as to realize the stress monitoring of cement-based composites components by the sensor.The results show that,in the study of the strength of carbon fiber reinforced cement-based composites,the unconfmed compressive strength of carbon fiber reinforced cement-based composites is affected by both carbon fiber volume fraction and carbon fiber length,and the compressive strength increases first and then decreases with the increase of both.In the test range,2％is the optimal volume fraction and 6 mm is the optimal fiber length.In the study of the resistivity change rate of carbon fiber reinforced cement-based composites,when the carbon fiber volume fraction is 1％and the fiber length is 3 mm,the resistivity change rate of the specimen is the largest,and the self-sensing sensitivity of carbon fiber reinforced cement-based composites is the best.There is an obvious exponential relationship between the resistivity change rate of the sensor embedded in the component and the stress of the cement-based composites component.Through establishing a stress prediction formula based on resistivity change rate,the stress state monitoring of the cement-based composites structure can be realized.关键词
碳纤维/水泥土/无侧限抗压强度/电阻率变化率/自感/传感器Key words
carbon fiber/cement soil/unconfined compressive strength/resistivity change rate/self-sensing/sensor分类
建筑与水利引用本文复制引用
林江源,童立元,李洪江,马海洋,刘文源,闫鑫..碳纤维水泥土压电性及传感器性能研究[J].岩土力学,2024,45(7):2105-2116,12.
