摘要
为了探索芳纶与聚丙烯腈复掺混杂纤维对混凝土性能的改善效果,设计配合比,制备试块,进行冻融循环、抗盐冻剥落和抗碳化试验,研究不同芳纶-聚丙烯腈混杂纤维体积掺量对混凝土耐久性能的影响。试验结果表明:与未掺芳纶-聚丙烯腈混杂纤维的普通混凝土相比,当芳纶纤维掺量为0.4%、聚丙烯腈纤维掺量为0.2%时,200次清水冻融循环后混凝土的质量损失率降低了31.22%,相对抗压强度提高了13.66%;200次盐水冻融循环后混凝土的质量损失率降低了42.61%,相对抗压强度提高了14.89%;56 d养护龄期时,混凝土碳化深度达到了9.72 mm,较素混凝土降低了36.76%,碳化后混凝土的抗压强度增长幅度为1.25%~8.41%。综上所述,掺入芳纶-聚丙烯腈混杂纤维的混凝土具有良好的抗冻、抗盐冻及抗碳化性能,当芳纶纤维与聚丙烯腈纤维掺量分别为0.4%和0.2%时,混凝土的综合耐久性能最好。
To explore the improvement effect of aramid and polyacrylonitrile mixed fibers on the performance of concrete,the mix ratio is designed,test blocks are prepared,and tests of freeze-thaw cycles,salt frost resistance,and carbonation resistance are conducted.The impact of different volumetric contents of aramid-polyacrylonitrile hybrid fibers on the durability properties of concrete is studied.The test results show that the mass loss rate of concrete decreases by 31.22%,and the relative compressive strength improves by 13.66%following 200 freeze-thaw cycles in clean water,which is compared to plain concrete without fibers,when the volumetric fraction of aramid fibers is O.4o%and that of polyacrylonitrile fibers is 0.20%.After 200 freeze-thaw cycles of salt water,the mass loss rate of concrete decreases by 42.61%,and the relative compressive strength increases by 14.89%.At 56 days of curing,the carbonation depth of concrete is 9.72 mm,reduced by 36.76%compared to the plain concrete.The compressive strength of concrete increases by a range of 1.25%to 8.41%after carbonation.In conclusion,concrete mixed with aramid-polyacrylonitrile fiber has excellent resistance to frost,salt-frost,and carbonation.The concrete obtains optimal comprehensive durability when the content of aramid fiber is 0.4%and that of polyacrylonitrile fiber is 0.2%.
作者
袁玉卿
李世豪
周伏波
YUAN Yu-qing;LI Shi-hao;ZHOU Fu-bo(Kaifeng Research Center for Engineering Repair and Material Recycle,Henan University,Kaifeng 475004,China;School of Architecture and Engineering,Henan University,Kaifeng 475004,China)
出处
《公路》
北大核心
2025年第8期53-60,共8页
Highway
基金
开封市科技攻关项目,项目编号2301007
河南省科技攻关项目,项目编号242102241019、242102240025。
关键词
道路工程
水泥混凝土路面
混杂纤维
耐久性
冻融循环
碳化
road engineering
cement concrete pavement
hybrid fiber
durability
freeze-thaw cycle
carbonization
