Title:
Enhancing Fracture Properties in Cementitious Composites through Hybrid Fiber Reinforcement (Prepublished)
Author(s):
Qi Cao, Liujingyuan Su, Changjun Zhou, Kaiming Pan, Jun Wu, Xiaoyan Han
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
fracture properties, multiscale fiber reinforcement, nanocellulose, sisal fiber, steel fiber
DOI:
10.14359/51747870
Date:
6/11/2025
Abstract:
Adding fibers, especially steel fibers, to cementitious composites is one of the most commonly used methods to improve the mechanical properties of cementitious composites. While the high price becomes the most concerning factor in the use of steel fibers. This study aims to investigate the influence of the content of multiscale fibers, including nanocellulose, sisal fibers, and steel fibers, on the fracture properties of cementitious composites. The fracture properties will be evaluated using the initial fracture toughness, unstable fracture toughness, and fracture energy through the notched beam bending tests. The results demonstrate that replacing steel fiber with an appropriate amount of sisal fiber effectively improves fracture properties, indicating a balancing point between fracture-impeding property and price/ environment. Specifically, under total macro fiber volume fractions of 1% and 1.5%, the 0.2 % sisal fiber replacement to the steel fibers exhibits the best fracture impeding properties. Additionally, the incorporation of nanocellulose (2% optimal in the research) enables the formation of a multi-scale crack resistance system at the nano-micro level, further enhancing the fracture-impeding properties of cementitious composites. Moreover, the research found that adding the fibers collaboratively can cultivate a better enhancement in fracture-impeding properties than adding them separately.