|Table of Contents|

Experimental study on fracture characteristics of waste fiber recycled aggregate concrete(PDF)

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

Issue:
2025年05期
Page:
95-104
Research Field:
建筑材料
Publishing date:

Info

Title:
Experimental study on fracture characteristics of waste fiber recycled aggregate concrete
Author(s):
ZHOU Jinghai1; 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)
Keywords:
waste fiber;  recycled aggregate concrete;  three-point bending;  fracture characteristic;  fracture empirical model
PACS:
TU528.59
DOI:
10.19815/j.jace.2024.06044
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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Last Update: 2025-09-25