High-Performance - The study investigates the method to produce high-quality, long bamboo fibers using peroxyformic acid treatment and roller pressing/combing

The incorporation of bamboo fibers significantly enhances the tensile strength of cement-based composites. However, conventional bamboo fibers have low mechanical properties and are susceptible to alkaline hydrolysis and mineralization during the preparation of cement-based materials. This study systematically investigates the preparation of high-quality long bamboo fibers and the reinforcing mechanism of water-based epoxy resin on these fibers. The results indicate that the peroxyformic acid-assisted roller pressing and combing method produces long bamboo fibers of good quality without significant mechanical damage. The peroxyformic acid treatment was relatively mild, effectively removing hemicellulose and lignin from the bamboo while causing minimal damage to the cellulose. The optimized process conditions included a peroxyformic acid concentration of 20%, a temperature of 41°C, and a duration of 9.5 hours, achieving a theoretical cellulose extraction rate of 60.46%. Furthermore, bamboo fibers treated with low-viscosity water-based epoxy resin via vacuum-assisted impregnation showed a significant increase in tensile strength, reaching 658.58 MPa, which represents an increase of 58.5%. The analysis of the tensile force-deformation curves of the long bamboo fibers supports similar conclusions. The alkali resistance of the reinforced bamboo fibers was significantly improved, with only a 6.18% decrease in tensile strength after 28 days of exposure.