Advancing sustainable infrastructure: Leveraging forestry waste fibers to enhance crack resistance and durability in repair mortar

To reduce energy consumption in construction, minimize forestry waste, promote a circular economy, and resolve the issues of poor adhesion and cracking in repair mortar, this study uses waste wood fibers from phloem (WFP) as a reinforcing material. Additionally, vinyl acetate ethylene copolymer (VAE) copolymer is incorporated to enhance the toughness and durability of the repair mortar. The findings reveal that the inclusion of WFP-VAE significantly improves the workability of the repair mortar, reduces internal cracking, and enhances both tenacity and frost resistance. Moreover, the addition of WFP-VAE facilitates the formation of hydration products, thereby strengthening the interface between WFP and the cement matrix. Furthermore, WFP demonstrates superior thermal stability compared to conventional polyethylene fibers, while effectively mitigating the drying shrinkage behavior of the mortar. Notably, waste WFP contributes to a reduction in CO 2 emissions by up to 19.8%, underscoring its role in advancing sustainable infrastructure and environmentally friendly production practices. In conclusion, the development of crack-resistant, wood fiber-reinforced repair mortar holds significant potential for improving the structural integrity of repair materials and promoting the efficient utilization of forestry waste.