定向钢纤维水泥基复合材料的含砂率及定向时程影响规律

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (7): 2346-2354.

所属专题：水泥混凝土

定向钢纤维水泥基复合材料的含砂率及定向时程影响规律

陈卓异¹, 寇子豪¹, 熊永明², 易宏健¹, 曹先慧³

1.长沙理工大学土木工程学院,长沙 410114;
2.东南大学交通学院,南京 211189;
3.湖南省湘电试验研究院有限公司,长沙 410000

收稿日期:2023-12-18 修订日期:2024-02-05 出版日期:2024-07-15 发布日期:2024-07-24
作者简介:陈卓异(1985—),男,博士,副教授。主要从事桥梁结构设计理论、高性能纤维复材与加固方面的研究。E-mail:chenzyhit@163.com
基金资助:
国家自然科学基金(51708047,51778069);长沙市自然科学基金(kq2202207);湖南省自然科学基金(2023JJ40505);长沙理工大学研究生科研创新项目(CLSJCX22031,CLSJCX22032)

Sand Content and Orientation Time Influence Law of Oriented Steel Fiber Cementitious Composites

CHEN Zhuoyi¹, KOU Zihao¹, XIONG Yongming², YI Hongjian¹, CAO Xianhui³

1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. College of Transportation, Southeast University, Nanjing 211189, China;
3. Hunan Xiang Dian Test Research Institute Co, Changsha 410000, China

Received:2023-12-18 Revised:2024-02-05 Online:2024-07-15 Published:2024-07-24

摘要/Abstract

摘要： 为研究钢纤维水泥基复合材料中钢纤维定向分布规律,考虑定向时程和含砂率两种因素,基于团队自主研发的钢纤维定向设备,制作32个试件。在恒定磁场下,系统地开展了梯度定向时程与含砂率钢纤维定向试验,利用COMSOL有限元模拟定向试验磁场分布情况,通过CT-X射线扫描技术获取不同试件的截面图像,计算钢纤维的方向系数,讨论钢纤维受梯度定向时程与含砂率影响下的定向规律。研究结果表明:随着定向时程的增加,在相同含砂率条件下,钢纤维的方向系数在初始阶段迅速提升,然后逐渐减缓,最终趋于稳定;在相同定向时程下,含砂率过高或过低都会对钢纤维的定向效率产生不利影响,控制含砂率在40%左右时可以获得相对理想的钢纤维定向效果。

关键词: 水泥基复合材料, 磁场定向, 含砂率, 定向时程, 方向系数

Abstract: In order to study the steel fiber orientation distribution law of steel fiber cementitious composites, considering the two factors of orientation time and sand content, 32 specimens were made based on the steel fiber orientation equipment independently developed in the team. Under the constant magnetic field, the gradient orientation time and sand content steel fiber orientation tests were carried out systematically, using COMSOL finite element to simulate the magnetic field distribution of orientation tests, and using CT-X-ray scanning technology to obtain the cross-section images of different specimens. The orientation coefficient of steel fiber was calculated, and the orientation law of steel fiber under the influence of gradient orientation time and sand content were discussed. The results show that with the increase of orientation time, the orientation coefficient of steel fiber under the condition of the same sand content increases rapidly at the initial stage, and then slows down gradually and finally tends to be stable. Under the same orientation time, too high or too low sand content will adversely affect the orientation efficiency of steel fiber, and controlling the sand content at about 40% can obtain relatively ideal steel fiber orientation effect.

Key words: cementitious composite, magnetic orientation, sand content, orientation time, orientation coefficient

中图分类号:

TU528.57

陈卓异, 寇子豪, 熊永明, 易宏健, 曹先慧. 定向钢纤维水泥基复合材料的含砂率及定向时程影响规律[J]. 硅酸盐通报, 2024, 43(7): 2346-2354.

CHEN Zhuoyi, KOU Zihao, XIONG Yongming, YI Hongjian, CAO Xianhui. Sand Content and Orientation Time Influence Law of Oriented Steel Fiber Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(7): 2346-2354.

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定向钢纤维水泥基复合材料的含砂率及定向时程影响规律

Sand Content and Orientation Time Influence Law of Oriented Steel Fiber Cementitious Composites

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