基于改性竹纤维的超高性能混凝土力学强度试验研究  

Experimental Study on Mechanical Strength of Ultra-High Performance Concrete Based on Modified Polyethylene Fiber

作　　者：蒋伟勤 艾相仁 吴长清 马大朝[2] JIANG Weiqin;AI Xiangren;WU Changqing;MA Dachao(Liuzhou Institute of Technology,Liuzhou 545616,China;Guangxi University,Nanning 530004,China)

机构地区：[1]柳州工学院,广西柳州545616 [2]广西大学,广西南宁530004

出　　处：《造纸科学与技术》2025年第4期64-67,75,共5页Paper Science And Technology

基　　金：广西科技重大专项(桂科AA23073018);广西高校中青年教师科研基础能力提升项目(2022KY1692)。

摘　　要：为有效提升超高性能混凝土力学强度,利用聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物(P123)改性竹纤维,并进一步分析不同改性纤维掺量对超高性能混凝土(UHPC)的力学强度的影响。试验结果表明,当纤维掺量增加到1.5%时,抗压强度虽依然在增长,但增长幅度有所减缓。而当纤维掺量达到2.0%时,抗压强度出现下降趋势,且随着改性纤维掺量增加,混凝土抗弯强度呈先增加后下降趋势。当改性纤维掺量为1.5%时,混凝土最大抗弯强度为16.5MPa。因此,改性竹纤维最优掺量为1.5%。To effectively improve the mechanical strength of ultra-high performance concrete,this study modified bamboo fibers with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)triblock copolymer(P123),and further analyzed the effect of different modified fiber contents on the mechanical strength of ultra-high performance concrete(UHPC).The experimental results show that when the fiber content increases to 1.5%,although the compressive strength still increases,the growth rate slows down.When the fiber content reaches 2.0%,the compressive strength shows a decreasing trend.And with the increase of modified fiber content,the flexural strength of concrete shows a trend of first increasing and then decreasing.When the modified fiber content is 1.5%,the maximum flexural strength of concrete is 16.5MPa.Therefore,the optimal dosage of modified bamboo fiber is 1.5%.

关 键 词：改性竹纤维 超高性能混凝土 抗压强度 抗弯强度 

分 类 号：TS72[轻工技术与工程—制浆造纸工程]