Cell-Wall-Engineered Wood Enabling Metal-and-Adhesive-Free Cross-Laminated Timber.

Area of Science:

• Materials Science
• Wood Science
• Sustainable Construction

Background:

• Wood is a renewable resource with good mechanical properties, but its use in construction is limited by fastener stability and the need for metals and adhesives.
• Next-generation construction demands lightweight, strong, machinable, and sustainable materials.

Purpose of the Study:

• To develop a superstrong engineered wood material for metal-free and adhesive-free cross-laminated timber.
• To enhance wood's mechanical performance and dimensional stability through synergistic cell-wall engineering.

Main Methods:

• Pressure-controlled densification of natural beech wood to modify cell structure.
• Cell-wall engineering at cellular and molecular scales.
• Fabrication of wood-derived fasteners.

Main Results:

• Engineered wood achieved a density of 1.33 g cm^-3, flexural strength of 150.89 MPa, compressive strength of 88.48 MPa, and Janka hardness of 18.84 kN.
• A 3-dimensional mechanical interlocking network was formed, enhancing dimensional stability.
• Wood-derived nails performed comparably to steel fasteners, offering high strength-to-weight ratios without corrosion.

Conclusions:

• Synergistic cell-wall engineering creates a superstrong, dimensionally stable wood material.
• This engineered wood enables metal-free and adhesive-free timber construction, advancing sustainable building.
• The approach provides a scalable pathway for high-performance, eco-friendly green building applications.