Improving the connection between wood and cement using LBL nanocoating to create a lightweight, eco-friendly structural material

3rd International Conference on Competitive Materials and Technology Processes

Bejo, L.^1 ; Major, B.^1 ; Csoka, L.^1 ; Hantos, Z.^1 ; Karacsonyi, Zs^1

University of West-Hungary, Simony Karoly Faculty of Engineering, Wood Sciences and Applied Arts, Hungary^1

关键词: Bonded composites;    Cement matrix;    Eco-friendly;    Load-bearing performance;    Nano-coatings;    Structural elements;    Uniform coating;    Wood-based composites;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/123/1/012054/pdf
DOI  :  10.1088/1757-899X/123/1/012054

来源: IOP

【 摘 要 】

Structural elements made out of cement bonded wood may be an excellent alternative to flammable organic bonded composite beams, and CO2intensive, heavy and nonrenewable reinforced concrete. Unfortunately, preliminary studies showed that a sufficient load-bearing performance is difficult to achieve. Improving the compatibility of cement and wood by LbL nanocoating may be a significant step towards creating viable cement bonded wood load bearing elements. The study involved creating multi layer nanocoating on the surface of poplar veneer using various polyelectrolyte combinations and numbers of treatment cycles, and testing the withdrawal resistance of the samples from a cement matrix. PDDA-PSS treatment was found to form increasingly uniform coating on the surface of wood, while the results were less straightforward for PAH-PSS. Both types and all levels of treatment caused dramatic improvement in load withdrawal resistance. The best result - a more than tenfold improvement - was achieved by at least 10 cycles of PDDA-PSS treatment. PAH-PSS treatment yielded a somewhat more modest improvement, which was already evident after five treatment cycles. The results point to the excellent potential of LbL nanocoating for creating cement bonded structural wood based composite materials.