Abstract
Particles of dried corn cobs were employed for manufacture of cement bonded particleboards. Two types of clay soil (red and white) were used as supplement with cement to manufacture cement bonded particleboards. The production of the boards was done at varying proportions of 50/50/0, 50/40/10, 50/30/20, 50/20/30, 50/10/40 and 50/0/50 for (corn/cement/clay) in weight to weight basis while the other considerable production factors like nominal density and curing agent percentage remained constant at 1.30 g/cm3 and 3%. The chemical composition of the soil such as pH, organic carbon, organic matter, total nitrogen, and exchangeable bases were determined. Its impact on physical and mechanical properties such as density, water absorption, thickness swelling, modulus of rupture and modulus of elasticity were also investigated The results of the analysis of variance shows that all considerable production factors for the cement bonded particleboards were significant at 5% level of probability except clay soil type for density. The results show that cement bonded particleboard made of red clay soil with higher content of exchangeable bases proves better outstanding performance in density, strength and dimensional properties than the white clay soil. Among the cement bonded particleboards made at varying proportions. It was discovered that boards of 50/20/30 (corn/cement/clay) had better strength properties than others. Also, the boards made at the proportions of 50/40/10, 50/10/40 and 50/30/20 (corn/cement/clay) were better dimensionally stabled in moisture exposure but weak in strength. The outcome of this study may serve as a guideline for any manufacturer who intends to use clay soil as supplement for production of particleboards.
 Keywords: Cement, particleboard, clay soil, corn cobs, strength, variance
Highlights
Clay minerals are known to be one of the ancient building materials which are naturally available for infrastructural designs and play important roles in industrial minerals
The red clay soil was collected from a site located at Forestry Research Institute of Nigeria (FRIN), Ibadan while the white clay soil was collected from a site located at Itu town, Akwa Ibom State
The outcome of the soil analysis test result agree with previous findings of similar elements found in soil test investigated by (Lopez-Galindo et al, 2007) and the result shows that the clay employed for particleboard production in this study belong to the family of Phyllosillicates that consists of hydrated Alumino-silicates due to the presence of considerable amount of Mg, K, Ca, Na, and Fe
Summary
Clay minerals are known to be one of the ancient building materials which are naturally available for infrastructural designs and play important roles in industrial minerals. It has been known that addition of lignocellulosic materials like sawdust, rice husk and corn husk can enhance the insulation purposes of ceramic composites (Olusola, 1998). This development was done with the intention of improving the strength properties of the ceramic water filters. If woodfiber reinforced ceramic composites could be cheaply manufactured, agricultural waste like corn cob could as well be use as friction lining material with clay as alternative binder if investigated. The study is aim at producing particleboards from maize cob incorporated with varying proportion of cement and clay as binders
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