Fiber bundle recombination and gradient uniform lamination to process high-strength and tough bamboo engineering materials

In addition to high strength and stiffness, advanced structural engineering materials and components should also have designability and structural stability. Green building structural materials developed using bamboo face challenges in terms of durability and stability. In this work, we utilize fiber reorganization and gradient uniform lamination a high-strength, high-toughness, uniform and durable outdoor bamboo engineering material- Bamboo Bundle Laminated Veneer Lumber(BLVL) was prepared by the method of. The unique interlayer tight laminated interlocking occlusal structure and the glue nails enhance the interface bonding performance enhanced BLVL performance. The BLVL specific strength, specific modulus, and impact toughness were 267.70 MPa cm3 g−1, 20.73 GPa cm3 g−1, and 13.8 J/cm2, respectively. The density uniformity and dimensional stability were 2.47 and 2.24 times higher than those of the bamboo scrimber (BS), respectively. This work demonstrates the potential to produce lightweight durable structural engineering materials with controllable properties and designable structures from abundant sustainable fast-growing bamboos.