摘要
针对现代工业中大量废弃碳纤维亟需回收再利用问题,将废弃碳纤维与高强水泥基材料(HSCBM)相结合,研究了回收碳纤维(RCF)及其改性对HSCBM流动性、力学性能和导电性能的影响.结果表明:掺入RCF降低了HSCBM流动性,RCF经NaOH溶液和HNO_(3)溶液改性后HSCBM流动性最高可提升7.74%;不同水胶比下掺入未改性及改性RCF会降低HSCBM抗压强度,但提升了HSCBM抗折强度,经NaOH溶液、HNO_(3)溶液改性后HSCBM抗折强度最高可提升30.61%、24.46%;水胶比过低(0.20)时,掺RCF的HSCBM不具备导电能力,水胶比增至0.25时掺入RCF可显著提升HSCBM导电性,但其强度会大幅下降,RCF经NaOH溶液和HNO_(3)溶液处理后使HSCBM导电性能进一步提升,掺量达到渗滤阀值(0.6%)时,其7、28 d电阻率分别降低了81.41%和82.23%、94.88%和96.15%.研究结果可为HSCBM具有功能性和RCF循环利用提供新思路.
The massive waste carbon fibers in modern industry need to be recycled and reused.In this work,the effect of recycled carbon fibers(RCF)on the fluidity,mechanical property and electrical conductivity of high-strength cement-based material(HSCBM)was investigated using waste carbon fibers with the HSCBM.The results indicate that the incorporation of RCF reduces the fluidity of HSCBM,while the fluidity can be increased by 7.74%if RCF is modified by NaOH solution and HNO3 solution.Incorporating unmodified and modified RCF at different water-to-binder ratios can reduce the compressive strength of HSCBM.However,the flexural strength of HSCBM after modification of RCF with NaOH solution and HNO_(3) solution is improved,and the flexural strength of HSCBM can be increased by 30.61%and 24.46%,respectively.The RCF/HSCBM has no conductivity when the water-binder ratio is rather low(i.e.,0.20).When the water-binder ratio increases to 0.25,adding RCF can improve the conductivity of HSCBM,but its strength greatly reduces.After RCF is treated with NaOH solution and HNO_(3) solution,the conductivity of HSCBM is further improved.The 7 d and 28 d resistivity can be decreased by 81.41%-82.23%and 94.88%-96.15%,respectively,when the RCF amount reaches a percolation threshold(i.e.,0.6%).The research results can provide a new idea for the functional properties of HSCBM and RCF recycling.
作者
王艳
全志平
张少辉
WANG Yan;QUAN Zhiping;ZHANG Shaohui(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 University of Architecture and Technology,Xi'an 710055,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2023年第5期1332-1343,共12页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金面上项目(52078414)
国家优秀青年科学基金(52222806)
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)。
关键词
回收碳纤维
改性处理
高强水泥基材料
力学性能
导电性
recycled carbon fiber
modification treatment
high-strength cement-based material
mechanical properties
electrical conductivity
作者简介
第一作者:王艳(1982-),女,博士,教授。
