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

卷:

42卷

期数:

2025年05期

页码:

95-104

栏目:

建筑材料

出版日期:

2025-09-30

文章信息/Info

Title:

Experimental study on fracture characteristics of waste fiber recycled aggregate concrete

文章编号:

1673-2049(2025)05-0095-10

作者:

周静海^1,2,梁意博¹,康天蓓¹,孙红¹,曲晶彤¹,刘昱¹

(1. 沈阳建筑大学 土木工程学院,辽宁 沈阳 110168; 2. 沈阳建筑大学 绿色宜居乡村建设研究院,辽宁 沈阳 110168)

Author(s):

ZHOU Jinghai^1,2, LIANG Yibo¹, KANG Tianbei¹, SUN Hong¹, QU Jingtong¹, LIU Yu¹

(1. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China; 2. Green and Livable Rural Construction Institute, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China)

关键词:

废弃纤维;  再生混凝土;  三点弯曲;  断裂特性;  断裂经验模型

Keywords:

waste fiber;  recycled aggregate concrete;  three-point bending;  fracture characteristic;  fracture empirical model

分类号:

TU528.59

DOI:

10.19815/j.jace.2024.06044

文献标志码:

A

摘要:

为探究再生粗骨料和废弃纤维对废弃纤维再生混凝土断裂特性的影响,以再生粗骨料取代率、废弃纤维长径比、废弃纤维体积掺量及试件切口高度为研究变量,对废弃纤维再生混凝土梁试件进行三点弯曲试验,研究其破坏形态和裂缝张口位移曲线的变化规律; 分析各研究变量对试件初裂荷载、峰值荷载、弯曲强度、初裂韧度、失稳韧度、黏聚韧度、断裂能、临界能量释放率及特征长度等断裂特性的影响,并基于试验结果建立了废弃纤维再生混凝土的断裂经验模型。结果表明:随再生骨料取代率增加,再生混凝土失稳韧度和断裂能分别下降了59.5%和61.9%; 切口高度的增加会导致各断裂参数降低; 掺入废弃纤维后,再生混凝土的断裂特性得到明显改善,失稳韧度和断裂能最大增幅分别为52.6%和56%; 根据废弃纤维再生混凝土的断裂经验模型,建议废弃纤维的长径比为633,体积掺量在0.12%左右; 研究成果可为废弃纤维再生混凝土在不同工程领域的结构设计和应用提供参考。

Abstract:

In order to investigate the effects of recycled coarse aggregate and waste fiber on the fracture characteristics of waste fiber recycled aggregate concrete, taking the replacement ratio of recycled coarse aggregate, aspect ratio of waste fiber, volume content of waste fiber, and notch height as study variables, three-point bending tests on waste fiber recycled aggregate concrete beam specimens were carried out. The failure patterns and the variation law of crack mouth opening displacement curves were studied. The influence of each study variable on the initial cracking load, peak load, bending strength, initial cracking toughness, instability toughness, cohesive toughness, fracture energy, critical energy release rate, and characteristic length of fracture properties was analyzed. The results show that with the increase of the replacement ratio of recycled concrete aggregate, the instability toughness and fracture energy of recycled aggregate concrete decrease by 59.5% and 61.9%, respectively. The increase in incision height leads to a decrease in fracture parameters. The fracture characteristics of recycled aggregate concrete are significantly improved after the incorporation of waste fiber, and the maximum increases of instability toughness and fracture energy are 52.6% and 56%, respectively. Based on the fracture empirical model of waste fiber recycled aggregate concrete, the aspect ratio of waste fiber is suggested to be 633, and the volume content is about 0.12%. The research findings can provide reference for the structural design and application of waste fiber recycled aggregate concrete in different engineering fields.

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备注/Memo

备注/Memo:

收稿日期:2024-06-05 投稿网址:http://jace.chd.edu.cn
基金项目:国家自然科学基金项目(52108235,51678374); 辽宁省高等学校创新团队项目(LT2019011); 辽宁省教育厅基本科研项目(JYTMS20231578)
作者简介:周静海(1965-),男,工学博士,教授,博士生导师,E-mail: zhoujinghai@sjzu.edu.cn。
Author resume: ZHOU Jinghai(1965-), male, PhD, professor, E-mail: zhoujinghai@sjzu.edu.cn.

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更新日期/Last Update: 2025-09-25