碳纤维聚氨酯水泥复合材料压敏特性试验研究  

Experimental Study on Pressure Sensitive Characteristics of Carbon Fiber Reinforced Polyurethane Cement Composites

作　　者：杨楠 孙全胜[1] 李春玮 YANG Nan;SUN Quan-sheng;LI Chun-wei(School of Civil Engineering’ Northeast Forestry University1,Harbin 150040,China;College of Architecture and Civii Engineering Qiqihar University2,Qiqihar 161006,China)

机构地区：[1]东北林业大学土木学院,哈尔滨150040 [2]齐齐哈尔大学建筑与土木工程学院,齐齐哈尔161006

出　　处：《科学技术与工程》2018年第17期27-32,共6页Science Technology and Engineering

基　　金：齐齐哈尔市科技局工业攻关项目(GYGG-201606);齐齐哈尔大学青年资助面上项目(2014k-M10)资助

摘　　要：近年来,一种新兴的结构补强加固材料聚氨酯水泥(polyurethane-cement,PUC)中掺入适量碳纤维,制成导电聚氨酯水泥复合材料(conductive polyurethane-cement,CPUC)。讨论了其静态电阻率与固化龄期之间的关系,及静态电阻率的渗流阈值;并采用WDW-500型万能试验机、直流稳压电源和UT61E数字万用表系统测试了CPUC的压敏特性。研究结果表明,CPUC试块的电阻率随固化龄期的增加而增加;并逐渐趋于平缓。碳纤维掺量在2%左右达到渗滤阈值。可通过CPUC电阻率的变化,表征其弹性变形、裂缝稳定扩展及非稳定扩展的三个破坏过程。CPUC试块的这种特性,使其可作为一种本征智能加固材料,用于混凝土梁、墩柱加固后的无损检测。In recent years,the new kind of structural reinforcement polyurethane cement（ PUC） was added proper carbon fiber to made conductive polyurethane cement（ CPUC）. The percolation threshold of static resistivity and the relationship between static resistivity and curing age aimed be to explored. The pressure-sensitive properties of CPUC by WDW-500 universal testing machine,DC regulated power supply and UT61 E digital multimeter system were measured. The results demonstrated that the resistivity of CPUC test block positive correlate with curing age,then gradually tended to be gentle and reached the percolation threshold at carbon fiber content up to 2%. Detection of changes in electrical resistivity CPUC,characterized the three processes of elastic deformation,stable crack propagation and unstable extension. This CPUC test block can be used as a kind of intrinsic intelligent strengthening material for nondestructive testing of reinforced engineering.

关 键 词：导电聚氨酯水泥 复合材料 静态电阻率 渗流阈值 压敏特性 

分 类 号：TB381[一般工业技术—材料科学与工程]