摘要
采用钢纤维与聚乙烯纤维混掺的方式制备了混杂纤维高韧性水泥基复合材料(hybrid fiber high toughness cementitious composite,HFHTCC),通过标准拉伸试验及电镜扫描,研究了相同聚乙烯纤维掺量时钢纤维掺量、直径、长度、形状等因素对HFHTCC拉伸性能的影响。研究表明:相较于单掺聚乙烯纤维,钢纤维的掺入可显著提高材料的开裂应力和峰值应力,且开裂应力随钢纤维掺量的增加而提高,但峰值应力与钢纤维掺量并未呈现正相关,峰值应变则明显下降。采用端钩型钢纤维的HFHTCC的开裂应力和峰值应力均低于平直型钢纤维的,但其峰值应变更大;掺量较低时采用长钢纤维,掺量较高时采用短钢纤维,对开裂应力有更好的提高效果;为获得较高的峰值应变,需在掺量较低时采用小直径钢纤维,或掺量较高时采用大直径钢纤维。
A hybrid fiber high toughness cementitious composite(HFHTCC)was produced by mixing the steel fiber and polyethylene(PE)fiber together.The tensile tests and scanning electron microscope tests were conducted to analyze the influence of volume percentage,diameter,length,and shape of the steel fiber on the tensile performance of HFHTCC under the same PE fiber volume percentage.The results show that,compared with the cementitious composite only with PE fiber,the combination of steel fiber and PE fiber can effectively enhance the cracking stress and peak stress of HFHTCC.The cracking stress increases with the increase in steel fiber volume percentage.However,the development of peak stress does not present a positive correlation with the steel fiber volume percentage.The peak strain of HFHTCC with different steel fiber volume percentages obviously decreases compared to specimens only with PE fiber.Although the cracking stress and peak stress of HFHTCC with end-hooked steel fiber are less than HFHTCC with straight steel fiber,the peak strain is even higher.Better crack-resistance performance of the HFHTCC is expected to be achieved when adopting long steel fiber with a low volume percentage or short steel fiber with a high volume percentage.A higher peak strain can be achieved when adopting small-diameter steel fiber with a low volume percentage or large-diameter steel fiber with a high volume percentage.
作者
柴鑫伟
谢群
王欣
朱学军
李阳
CHAI Xinwei;XIE Qun;WANG Xin;ZHU Xuejun;LI Yang(School of Civil Engineering and Architecture,University of Jinan,Jinan 250022,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering of China Ministry of Education,Shandong Jianzhu University,Jinan 250013,China;China Construction Fifth Engineering Division Co.,Ltd,Jinan 250101,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2022年第S01期353-361,共9页
Journal of Building Structures
基金
建筑结构加固改造与地下空间工程教育部重点实验室开放课题(MEKL202006)
山东省住房城乡建设科技计划(2020-K5-18)
关键词
高韧性水泥基复合材料
混杂纤维
钢纤维
聚乙烯纤维
静力试验
抗拉性能
high toughness cementitious composite
hybrid fiber
steel fiber
polyethylene fiber
static test
tensile performance
作者简介
柴鑫伟,出生于1997年,男,硕士研究生,主要从事纤维增强水泥基复合材料研究。email:2528620783@qq.com;通信作者:谢群,出生于1979年,男,工学博士,教授,主要从事新材料结构研究。email:cea_xieq@ujn.edu.cn
