石墨烯智能混凝土在正交和斜交于受力方向的压敏响应  

Experimental Study on the Piezoresistive Reaction of Graphene Smart Concrete along Transverse and Diagonal Directions of Loading

作　　者：吴文鑫 康志斌 王洁 张勇[2] 刘琼 

机构地区：[1]江苏大学土木工程与力学学院,镇江212013 [2]青岛酒店管理职业技术学院酒店工程学院,266100

出　　处：《混凝土与水泥制品》2018年第5期15-18,共4页China Concrete and Cement Products

基　　金：上海市青年科技启明星计划(14QB14038000);江苏省高等学校大学生创新创业训练计划(201710299058Y)

摘　　要：利用石墨烯智能混凝土棱柱体试块,在其中埋置电极形成沿受力方向、正交于受力方向和斜交于受力方向的电极对,在施加弹性阶段的循环荷载情况下,测试其不同方向的电阻变化趋势,对照该方向的应变变化规律,总结石墨烯智能混凝土在不同方向上的压敏响应特征。结果表明,沿受力方向、正交方向和斜交方向的电阻变化规律相似,都随压力的增加而减小,随压力的释放而增加,电阻变化率都在8%左右,这说明它们主要受体积变化的控制,然而,正交于受压方向的压敏性能也受泊松比的影响,使其电阻变化幅度变小,为7.16%。用体积变化率和应变率共同构建的压敏特征模型方程能统一描述三个方向的电阻变化率。Some prism specimens made of graphene smart concrete were casted, in which electrodes were imbedded toconstitute three electrode pairs along forcing, transverse and diagonal directions. And then, the resistance and strain alongdifferent directions were monitored during loading a cyclic load within elastic regime on the specimens to summarize thepiezoresistive characteristics along those directions. The results show that the resistance changing trends on three directionsare similar, that is, they all decrease as pressure rising and increase as releasing the pressure. Additionally, the resistancechanging amplitudes are all around 8%, which illustrates that their piezoresistance are controlled mainly by volume change.However, the piezoresistance on transverse forcing direction shows small amplitude, which is 7.16%, as to forcing directiondue to the tensile strain generated by Poisson’s ratio. The piezoresistance model function built with volume change ratio andstrain ratio can unifiedly describe the resistance changes of three directions.

关 键 词：石墨烯 智能混凝土 压敏响应 

分 类 号：TU528[建筑科学—建筑技术科学]