竹纤维对超高性能混凝土力学性能和自收缩的影响  

Effect of bamboo fiber on mechanical properties and autogenous shrinkage of ultra-high performance concrete

作　　者：赵华 任国盛 刘超群 ZHAO Hua;REN Guosheng;LIU Chaoqun(Jiangxi Transportation Institute Co.,Ltd.,Nanchang 330020,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Project Construction Management Company,Jiangxi Communications Investment Group Co.,Ltd.,Nanchang 330052,China;Road Material and Structure Engineering Technology Research Center of Jiangxi Province,Nanchang 330020,China)

机构地区：[1]江西省交通科学研究院有限公司,江西南昌330020 [2]南昌大学工程建设学院,江西南昌330031 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150090 [4]江西省交通投资集团有限责任公司项目建设管理公司,江西南昌330052 [5]江西省道路材料与结构工程技术研究中心,江西南昌330020

出　　处：《混凝土》2024年第11期113-116,共4页Concrete

基　　金：国家自然科学基金联合重点项目(U2106220);黑龙江省自然科学基金重点项目(ZD2021E007);南昌大学江西省财政科技专项“包干制”试点示范项目;江西省交通运输厅科技项目(2021C0008)。

摘　　要：研究了竹纤维对超高性能混凝土(UHPC)力学性能和自收缩的影响,并测试了试件在遭受30次干湿循环后的力学性能和质量损失。结果表明:单独掺加竹纤维时,UHPC的弯曲强度随纤维掺量的增加而显著提高,掺量为1.5%时提高幅度高达32.7%;此外,在掺加一定量钢纤维的基础上额外混杂掺加竹纤维可以有效增强UHPC的弯曲强度和韧性,表明竹纤维和钢纤维间具有良好的协同效应。掺加1.0%竹纤维可使UHPC的自收缩降低52.7%,并且竹纤维UHPC试件在经历干湿循环后力学性能没有损失,但其长期耐久性仍需进一步被验证。The effect of bamboo fiber on the mechanical properties and autogenous shrinkage of ultra-high performance concrete(UHPC)was investigated in this study,and the mechanical properties and mass loss of the specimens subjected to 30 drying and wetting cycles were also tested.The results showed that when bamboo fiber was added alone,the flexural strength of UHPC increased significantly with the increase of fiber content,and the increase was as high as 32.7%when the content was 1.5%.Moreover,the flexural strength and toughness of UHPC were significantly enhanced by incorporating bamboo fiber when the content of steel fiber was constant,indicating that bamboo and steel fiber had a good synergy effect.Adding 1.0%bamboo fiber could reduce the autogenous shrinkage of UHPC by 52.7%,and the mechanical properties of bamboo fiber reinforced UHPC specimens did not decrease after drying and wetting cycles,but their long-term durability still needs to be further verified.

关 键 词：竹纤维 超高性能混凝土 纤维混杂 力学性能 自收缩 

分 类 号：TU528.041[建筑科学—建筑技术科学]