摘要
采用具有显著成本优势的国产聚乙烯醇(PVA)纤维制备了高延性水泥基复合材料(PVA-ECC),通过控制单因素变量的方法研究了PVA纤维掺量、粉煤灰掺量、水胶比、石英砂粒径对PVA-ECC的力学性能的影响,并在最优设计参数条件下对比分析了国产与日本PVA-ECC的性能差异,最终提出一种基于国产PVA纤维的ECC制备工艺。研究结果表明:采用国产PVA纤维,水泥∶粉煤灰∶砂∶纤维∶水∶减水剂=1∶2.2∶1.16∶0.066∶0.866∶0.0063,制备一种28 d抗压强度为42.7 MPa,抗折强度为15.1 MPa,极限拉应变为2.43%的国产PVA-ECC。与日本PVA纤维相比,采用国产PVA纤维制备ECC抗压和抗折强度分别为日本PVA纤维制备的ECC的98.4%和92.1%,国产PVA制备的ECC极限拉应变为日本的91.6%,两种ECC均能达到2.0%以上,且国产的在成本方面更具有优势。国产PVA纤维在ECC拉伸过程中更多是拔断而不是滑移拔出,而日本纤维多为滑移拔出。
In this paper,domestic polyvinyl alcohol(PVA)fiber with significant cost advantage was used to prepare high ductility cement based composite material(PVA-ECC).By controlling single factor variables,the influences of PVA fiber content,fly ash content,water-binder ratio and quartz sand particle size on the mechanical properties of PVA-ECC were studied.The performance difference between domestic and Japanese PVA-ECC was compared and analyzed under optimal design parameters.Finally,an ECC preparation process based on domestic PVA fiber was proposed.The results show that:using domestic PVA fiber,cement:fly ash:sand:fiber:water:water reducing agent=1∶2.2∶1.16∶0.066∶0.866∶0.0063,a domestic PVA-ECC with 28d compressive strength of 42.7MPa,flexure strength of 15.1MPa and ultimate tensile strain of 2.43%was prepared.Compared with Japanese PVA fiber,the compressive and flexational strength of ECC prepared by domestic PVA fiber is 98.4%and 92.1%of that prepared by Japanese PVA fiber,respectively,and the ultimate tensile strain of ECC prepared by domestic PVA fiber is 91.6%of that prepared by Japanese PVA fiber,both of which can reach more than 2.0%,and the domestic ECC has more advantages in cost.In the ECC stretching process,the domestic PVA fiber is more pull-out than sliding pull-out,while the Japanese fiber is mostly sliding pull-out.
作者
袁宇辉
李安
孙健翔
YUAN Yuhui;LI An;SUN Jianxiang(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;College of Mechanics and Materials,Hohai University,Nanjing 211100,China)
出处
《建筑结构》
北大核心
2023年第S01期1569-1573,共5页
Building Structure
