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Technical Report

PERFORMANCE OF ZINC BORATE-TREATED ORIENTED STRUCTURAL STRAW BOARD AGAINST MOLD FUNGI, DECAY FUNGI, AND TERMITES – A PRELIMINARY TRIAL

In recent decades, due to the shortage of wood resources and environmental impact from burning agricultural residues in China, there has been significant work carried out on straw-based composites (Han 2001; Zhang et al. 2003). One possible area for straw-based panels to enter the industry is the structural panel market. The world’s first oriented structural straw board (OSSB) manufacturing plant has been operating in China since October 2009. The OSSB product is comparable to wood-based oriented strand board (OSB) in both physical and mechanical properties at comparable densities (Wasylciw 2001 and Han et al. 2010a). OSSB is therefore considered as a new building material in China (Han et al. 2010a and 2010b)...

Oriented Structural Boards from Split Wheat Straw: Effects of Straw Length, Panel Density, and Resin Content

Wheat straws were split longitudinally using a specially designed straw splitter. Oriented structural boards made from the split straw strands were fabricated with polymeric diphenylmethane diisocyanate (pMDI) resin. The effects of the split straw strand length, resin content, and panel density on the properties of oriented structural straw board (OSSB) were investigated. Dimensional analysis showed that the average length of split straw strands after screening of the fines was 83.74 mm. More than 70% of the straw strands were in the range of 50 to 90 mm in length. The bending properties of the OSSB were highly related to the length of the split straws. The modulus of rupture (MOR) and modulus of elasticity (MOE) increased significantly as the split straw length was increased, particularly from 11 mm to 45 mm...