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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

38卷

期数:

2021年05期

页码:

74-82

栏目:

出版日期:

2021-09-15

文章信息/Info

Title:

Effect of Fiber Content on Fluidity and Mechanical Properties of Recycled Brick Powder ECC

文章编号:

1673-2049(2021)05-0074-09

作者:

元成方,王 娣,李好飞,张 哲

(郑州大学 土木工程学院,河南 郑州 450001)

Author(s):

YUAN Cheng-fang, WANG Di, LI Hao-fei, ZHANG Zhe

(School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China)

关键词:

再生砖粉;  超高韧性水泥基复合材料;  PVA纤维;  流动性能;  力学性能

Keywords:

recycled brick powder;  ECC;  PVA fiber;  fluidity;  mechanical property

分类号:

TU528

DOI:

10.19815/j.jace.2021.03080

文献标志码:

A

摘要:

为更好地掌握再生砖粉超高韧性水泥基复合材料(ECC)的工作性能和力学性能,为再生砖粉ECC的研究与推广提供依据与参考,通过试验研究了不同聚乙烯醇(PVA)纤维体积掺量对再生砖粉ECC流动性能及力学性能的影响。结果表明:再生砖粉全取代石英砂会在一定程度上削弱ECC的力学性能; 随着PVA纤维体积掺量在1.25%～2.0%范围内不断增加,再生砖粉ECC拌合物流动性不断下降; 再生砖粉ECC抗折强度先增大后减小,纤维体积掺量为1.75%时抗折强度最大; 抗压强度随纤维掺量的增加而减小,在纤维体积掺量1.5%～1.75%范围内下降幅度最为明显; 压折比不断下降,材料柔韧性增加; 抗弯强度、弯曲开裂挠度与极限挠度随纤维掺量的增加而增大,试件表现出更好的韧性; 拉伸开裂应变与极限应变随纤维掺量的增加不断增大,拉应变硬化特征明显; 再生砖粉ECC四点弯曲试验中的极限跨中挠度和单轴拉伸试验中的极限应变具有较好的线性相关关系。

Abstract:

In order to better grasp the working performance and mechanical properties of recycled brick powder engineered cementitious composites(ECC), and provide basis and reference for the research and promotion of recycled brick powder ECC, the effect of polyvinyl alcohol(PVA)fiber content on the flow properties and mechanical properties of recycled brick powder ECC was analyzed through experimental research. The results show that the replacement of quartz sand by recycled brick powder weakens the mechanical properties of ECC to a certain extent. In the range of 1.25%-2.0%, as the volume of fiber content increases, the fluidity of the recycled brick powder ECC mixture decreases. The flexural strength increases firstly and then decreases, and when the fiber content is 1.75%, the flexural strength is the largest. The compressive strength decreases with the increase of fiber content, and the decrease is the most obvious in the range of 1.5%-1.75%. The squeeze ratio keeps decreasing and the material flexibility increases. The bending strength, bending cracking deflection and ultimate deflection increase with the increase of fiber content, showing better toughness and ductility.The tensile cracking strain and ultimate strain continue increasing with the increase of fiber content, and the tensile strain hardening characteristics are obvious. There is a good linear correlation between the ultimate mid-span deflection in four point bending test and the ultimate strain in uniaxial tensile test of recycled brick powder ECC.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2021-03-21
基金项目:河南省重点研发与推广专项项目(202102310255); 河南省交通运输科技计划项目(20200410)
作者简介:元成方(1983-),男,河南郑州人,高级工程师,工学博士,博士后,E-mail:chengfang1102@zzu.edu.cn。

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更新日期/Last Update: 2021-09-01