龄期对定向钢纤维增强水泥基复合材料断裂性能的影响

卿龙邦; 杨卓凡; 慕儒

doi:10.13204/j.gyjzG20012801

龄期对定向钢纤维增强水泥基复合材料断裂性能的影响

doi: 10.13204/j.gyjzG20012801

河北工业大学土木与交通学院, 天津 300401

基金项目:

国家自然科学基金项目（51779069）。

详细信息

作者简介:
卿龙邦,男,1982年出生,博士,副教授。电子信箱:qing@hebut.edu.cn

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- 文章访问数: 85
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-27
- 网络出版日期: 2021-04-30

EFFECTS OF AGES ON FRACTURE PROPERTIES OF ORIENTED STEEL FIBER-REINFORCED CEMENTITIOUS COMPOSITES

Department of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

摘要

摘要: 通过开展不同龄期的预制缺口三点弯曲梁断裂试验，研究龄期对定向及随机乱向钢纤维增强水泥基复合材料断裂性能的影响。根据试验测得的荷载-裂缝口张开位移曲线，分析不同龄期的钢纤维增强水泥基复合材料裂缝扩展的全过程。结果表明：钢纤维增强水泥基复合材料的弯曲强度随着龄期的增加而增加；在7 d龄期内，随着龄期的增长，定向钢纤维增强水泥基复合材料的断裂能增长较快，在7 d龄期后，断裂能的增长放缓且趋于稳定；当钢纤维体积掺量由1.2%增加到2.0%时，断裂能明显增大，且定向钢纤维增强水泥基复合材料的断裂能增长幅度相较随机乱向钢纤维增强水泥基复合材料更为显著。
- 龄期 /
- 定向钢纤维 /
- 水泥基复合材料 /
- 弯曲强度 /
- 断裂能
Abstract: The three-point bending tests on notched beams of different ages were conducted. The effects of ages on the fracture properties of oriented steel fiber-reinforced cementitious composites and randomly oriented steel fiber-reinforced cementitious composites were studied. Based on the curves of loadimg and crack opening displacement, the whole process of crack development of steel fiber-reinforced cementitious composites at different curing ages was analyzed. The results showed that, the flexural strength of steel fiber-reinforced cementitious composites increased with the increase of curing ages. The fracture energy of the composites increased rapidly in the stage of the first 7 days, and then slowed down and tended to be stable. When the volume contents of steel fiber varied from 1.2% to 2.0%, the fracture energy increased significantly, and the inprovement effect of the fracture energy of the composites was more obvious than that of randomly oriented fiber-reinforced cementitions conposites.
- age /
- oriented steel fiber /
- cementitious composite /
- flexural strength /
- fracture energy

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参考文献(24)

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