International Journal of Science and Technology

International Journal of Science and Technology>> Volume 7, Number 2, February 2017

International Journal of Science and Technology


Effects of Silica Clay on Thermo-Physical Properties of Iroko Sawdust Cement Board

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Author Ogunleye I.O, Awogbemi.O
On Pages 479-485
Volume No. 2
Issue No. 7
Issue Date July, 2012
Publishing Date July, 2012
Keywords Silica clay, iroko sawdust, thermal conductivity.


Abstract

This work investigates the effects of silica clay on the thermo-physical properties of Iroko sawdust cement board. The properties investigated were thermal conductivity, thermal resistivity, water absorption, percentage shrinkage, density, modulus of rupture and compressive strength. Ten samples, labeled A to J, of Iroko sawdust with varying percentage of silica clay using 15% (by mass) cement as binder were cast into a wooden-mould (150mm2) to form particle boards. A Lees disc apparatus was used to determine the thermal conductivity while tensometer apparatus and a digital weighing balance were used to determine the compressive strength and density respectively. The result shows that a sample with 45% of clay, 15% cement and 40% sawdust tagged sample J has the highest value of thermal resistivity, compressive strength, percentage shrinkage, modulus of rupture and density with numerical values of 3.1027W/mk, 1.389MN/m2, 4%, 1.017MN/m2, and 0.425kg/m3 respectively. The sample with 0% clay, 15% cement and 85% sawdust tagged sample A has the highest thermal conductivity and percentage water absorption value of 0.4923W/mk and 68.75% respectively. As the silica clay content of each sample increases, its thermal resistivity, percentage shrinkage, density, modulus of rupture and compressive strength values increases while its water absorption and thermal conductivity decreases.

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