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碳纤维水泥基材料的机敏特性研究
引用本文:姚武,陈兵,吴科如.碳纤维水泥基材料的机敏特性研究[J].复合材料学报,2002,19(2):49-53.
作者姓名:姚武  陈兵  吴科如
作者单位:同济大学,混凝土材料研究国家重点实验室,上海,200092
基金项目:国家自然科学基金 (5 990 80 0 7),高等学校骨干教师资助计划资助项目
摘    要:水泥基材料是一种高电阻率的惰性材料,通过掺入一定体积含量(0.2 vol%~1.2 vol%)的短切碳纤维,可显著提高其电导率。本文作者研究了碳纤维水泥基材料表观电导特性与其内部微观结构的关系,探讨了电阻率的变化与材料所受外部荷载的关联性。结果表明碳纤维水泥基材料具有实时诊断内部损伤的机敏性:当水泥基材料内部裂纹产生或扩展时,表现为材料电阻率上升;而当水泥基材料内部裂纹闭合时,其电阻率下降。碳纤维水泥基材料的电阻变化与所受荷载呈良好的线形关系;而不含碳纤维的普通水泥基材料在整个受荷过程中,其电导特性则无明显变化。碳纤维水泥基材料电导特性的变化反映了水泥基材料内部损伤状况丰富的信息,根据这一特性可以及时预报水泥基材料内部潜在的损伤状况,有效地防止灾难性的破坏。

关 键 词:碳纤维  水泥基材料  电阻率  损伤
文章编号:1000-3851(2002)02-0049-05
收稿时间:2000-09-06
修稿时间:2000年9月6日

STUDY OF SMART CHARACTERISTICS OF CARBON FIBER REINFORCED CEMENT-BASED MATERIALS
YAO Wu,CHEN Bing,WU Ke-ru.STUDY OF SMART CHARACTERISTICS OF CARBON FIBER REINFORCED CEMENT-BASED MATERIALS[J].Acta Materiae Compositae Sinica,2002,19(2):49-53.
Authors:YAO Wu  CHEN Bing  WU Ke-ru
Affiliation:State Key Laboratory of Concrete Materials Research, Tongji University, Shanghai 200092, China
Abstract:Cement based material is an inert material with high electrical resistivity, but its electrical conductivity can be obviously improved by the addition of short carbon fibers (0.2 vol%~ 1.2 vol%). In this paper, the relationships between inner microstructure and apparent electrical properties, change of electrical resistivity and external applied load of carbon fiber reinforced cement based material were investigated. The test results indicated that the carbon fiber reinforced cement based material could function as a smart material for the real time diagnosis of damage. The electrical signal is related to an increase in the material's volume resistivity during the crack generation or propagation and a decrease in the resistivity during crack closure. The linearity between the electrical resistance change and the applied load was good for the carbon fiber reinforced cement based material. In contrast, the cement based material without carbon fibers showed no variation of the resistivity during the entire load process. The change of electrical characteristics reflects large numbers of information of inner damage of the cement based material, which can be used to detect potential damage and to prevent fatal failure.
Keywords:carbon fiber  cement  based material  electrical resistivity  damage
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