ZHU C X, QI Z H, WU D Z.Study on macroscopic and mesoscopic mechanical properties of carbon fiber-toughened grouting consolidation bodies[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(5):161-170.

DOI:10.16186/j.cnki.1673-9787.2023120007

Received: 2023/12/05

Revised: 2024/02/22

Published:2025/07/23

Study on macroscopic and mesoscopic mechanical properties of carbon fiber-toughened grouting consolidation bodies

Zhu Changxing, Qi Zhonghua, Wu Dazhi

School of Civil Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， China

Abstract: Objectives This study aims to investigate the toughening and crack-resistance effects of carbon fiber （CF） in grouting consolidation bodies （GCBs）. Methods Three-point bending tests were performed on GCBs containing 0%， 0.5%， 1.0%， and 1.5% CF. Scanning electron microscopy （SEM） was used to analyze the toughening and crack-resistance mechanisms of CF at the microscale. Additionally， numerical simulations of three-point bending tests were conducted on GCBs with 0% and 1.0% CF to study the toughening and crack-resistance behavior from mesoscopic and macroscopic scales.  Results The 1.0% CF–reinforced GCB exhibited the highest tensile strength， toughness index， and energy dissipation capacity. The failure modes of CF within the matrix included debonding failure， tensile failure， and shear failure. The tensile failure surfaces were smooth and flat， while shear failure surfaces were inclined at approximately 45°. The failure mode and stress-strain curves obtained from laboratory tests and simulations were in good agreement. The tensile strength of the 1.0% CF-GCB reached 5.54 MPa， representing an 18% increase over the 0% CF sample. Conclusions The stress borne by CF at the bottom of the model was higher than that in the middle and upper parts. Randomly distributed carbon fibers and gravel influenced crack propagation paths. These findings provide a reference for further investigation of the toughening and crack resistance mechanisms of carbon fiber.

Key words:carbon fiber;grouting consolidation body;toughening;crack resistancenumerical simulation