不同形态回收碳纤维水泥基材料的力学与导电性能  

Mechanical and Electrical Properties of Recycling Carbon FiberCement-based Materials with Different Forms

作　　者：王艳 高腾翔 张少辉 李文俊 牛荻涛[3] WANG Yan;GAO Tengxiang;ZHANG Shaohui;LI Wenjun;NIU Ditao(School of Materials Science and Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;State Key Laboratory of Green Building in Western China,Xi'an 710055,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055 [2]西部绿色建筑国家重点实验室,西安710055 [3]西安建筑科技大学土木工程学院,西安710055

出　　处：《材料导报》2024年第9期274-282,共9页Materials Reports

基　　金：国家优秀青年科学基金(52222806);国家自然科学基金(52078414);陕西省杰出青年科学基金(2022JC-20);陕西省教育厅科学研究计划重点项目(20JY037)。

摘　　要：将碳纤维生命周期内产生的预浸料、织物及复合材料废弃物通过切割与粉碎制备短切回收碳纤维(CRCF)、回收碳纤维球(RCFS)及回收碳纤维粉(RCFP),研究不同形态回收碳纤维对水泥基材料力学与导电性能的影响机理和规律。结果表明,CRCF阻裂作用与RCFP填充孔隙作用使水泥基材料抗压强度和抗折强度显著提升,但RCFS的团聚导致其提升效果不显著。CRCF在水泥基材料内部搭接形成导电通路,电阻率随CRCF掺量的增加而降低,下降幅度超过90%,且渗滤阈值的掺量随CRCF长度的增大而显著降低。RCFS掺入基体后以孤立的球状形态分散在基体中,RCFP表面残留的树脂会阻碍导电通路的形成,这两种形态的回收碳纤维水泥基材料的电阻率降低幅度均小于10.7%。将CRCF水泥基材料中的电阻分为纤维通路电阻、纤维接触电阻和隧道传输电阻,建立了导电模型,模型误差为9.24%~40.1%。The prepreg,fabric and composite waste generated during the life cycle of carbon fiber,were clipping and shredding into chopped recycling carbon fiber(CRCF),recycling carbon fiber sphere(RCFS)and recycling carbon fiber powder(RCFP),studying on mechanical and electrical properties of recycling carbon fiber reinforced cement-based materials with different forms.The crack arresting effect of CRCF and the pore filling effect of RCFP would all enhance the strength of the cement-based materials.While the agglomeration of RCFS resulted in an insignificant lifting effect.CRCF formed a conductive path inside the cement-based material.The resistivity decreased with the increase of CRCF content by more than 90%,and the content of percolation threshold decreased significantly with the increase of CRCF length.RCFS was dispersed in an isolated spherical form in the matrix,and the residual resin on the surface of RCFP hinders the formation of conductive paths,and the resistivity reduction of the two forms of recycled recycling carbon fiber reinforced cement-based composite materials was less than 10.7%.The conductive model is established by dividing its resistance into fiber contact resistance,fiber pathway resistance and tunnel transmission resistance.The model error is 9.24%—40.1%.

关 键 词：回收碳纤维形态 机械回收 水泥基复合材料 力学性能 导电性 

分 类 号：TU528[建筑科学—建筑技术科学]