Abstract
This study was carried out to investigate the effect of pretreatment on the sorption and strength properties of board manufactured from Gliricidia sepium sawdust. Twenty four (24) experimental boards were produced at three pretreatment levels of hot water (1 h), cold water (2 weeks and 4 weeks), three mixing ratios (1:1, 2:1 and 1:2), and one board density 700 g/m 3 . and test for their bonding strength by physical (water absorption-WA and thickness swelling-Th.S) and mechanical properties (modulus of elasticity-MOE, modulus of rupture-MOR). Data obtained was analyzed using analysis of variance at α = 0.05. The result showed that board produced from mixing ratio 1:2 (sawdust to cement) of hot water for 1 h pretreatment is more dimensionally stable since it has the least mean values 44.10 and 50.23 % for water absorption and 1.17 and 2.76 % for thickness swelling in 1 and 6 h immersion and highest mean values of 68.94 and 0.33 N/mm 2 for modulus of rupture and elasticity respectively. However, the analysis of variance shows that pretreatment levels and production variables have a significant effect on the physical and mechanical properties examined thus increase in pretreatment and mixing ratio resulted in the improvement of dimensional stability and increase in the strength properties of the board produced. Keywords: sawdust, pretreatment, particleboard, strength properties DOI: 10.7176/JNSR/11-20-03 Publication date: October 31 st 2020
Highlights
Wood is a natural organic material, a composite of cellulose fiber embedded in amatrix of lignin which resists compression (Kermani 1998)
The values for percentage water absorption property showed that board with hot water pretreatment at mixing ratio 1: 2 has the lowest value of 44.10 % at 1 h and 50.23 % at 6 h of immersion
The range of value recorded was higher than the range obtained by Amiandamhen & Izekor (2013) who both found out that the absorption of water by sawdust board and rice husk fine board was 25.96 - 40.95 % in a ratio of cement to the particle of 70:30 while a board with the highest water absorption is from the pretreatment of cold water (4weeks) at mixing ratio of 2:1 of 99.15 % at 1 hour and 101.30 % at 6 h of immersion
Summary
Wood is a natural organic material, a composite of cellulose fiber embedded in amatrix of lignin which resists compression (Kermani 1998). Its waste is residues derived during various conversion processes and is in the form of trimmings edgings slabs shavings, sawdust, etc. These wastes or residues are generated in large quantities as reported by Ajayi (2006) and the bulk of these waste generated in Nigeria was estimated to be 1.72 million cubic meters in 2001 and we can be sure to have doubled up the figure . A strategy of converting this wastes into value-added products must be imbibed like pyrolytic oil (Adegoke et al 2014)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
