|Table of Contents|

Fracture properties and crack propagation process of recycled mortar under three-point bending(PDF)

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

Issue:
2025年02期
Page:
114-121
Research Field:
建筑材料
Publishing date:

Info

Title:
Fracture properties and crack propagation process of recycled mortar under three-point bending
Author(s):
TANG Yuxiang1; 2;  XIAO Jianzhuang1; 3;  XIA Bing1
(1. College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. School of Transportation, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 3. Institute of Science and Technology for Carbon Peak & Neutrality, Guangxi University, Nanning 530004, Guangxi, China)
Keywords:
recycled mortar;  replacement ratio of recycled fine aggregate;  three-point bending fracture test;  double-K fracture toughness;  fracture energy;  crack propagation characteristic
PACS:
TU528
DOI:
10.19815/j.jace.2023.04037
Abstract:
To investigate the effect of the replacement ratios of recycled fine aggregate(RFA)on the fracture properties and crack propagation characteristics of mortar, experimental studies were conducted on the fracture behavior of mortar with four types of RFA replacement ratios(0%, 25%, 50%, and 100%). Based on the three-point bending notched beam tests, the fracture responses of recycled mortar were obtained, including the complete load-crack mouth opening displacement curves, critical crack propagation, initial cracking toughness, unstable toughness, and fracture energy. By using non-contact digital image correlation technology, the surface deformation of the specimen was measured to obtain the entire process of crack propagation in recycled mortar. The results show that the use of RFA reduces the initial linear slope and peak load of the load-displacement curves of recycled mortar, mainly affecting the critical crack propagation in the opening direction rather than the extension direction. The initial cracking toughness, unstable toughness, and fracture energy of recycled mortar gradually decrease with the increase of RFA replacement ratio. When the RFA replacement ratio is 100%, the initial cracking toughness, unstable toughness, and fracture energy of mortar decrease by 31.1%, 29.5%, and 37.8%, respectively. The development of the fracture process zone length of recycled mortar lFPZ with different RFA replacement ratio exhibits similar characteristics, which slowly develops to the peak load(0.24 times to 0.32 times the ligament length), then rapidly increases to fully development(0.83 times to 0.91 times the ligament length), and then lFPZ decreases with crack propagation.

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Last Update: 2025-03-20