EFFECTS OF WOODASH AND SAWDUST ADMIXTURE ON ENGINEERING PROPERTIES OF BURNT LATERITE CLAY BRICKS

• R. F. Falayi

  Department of Agricultural and Environmental Engineering, Federal University of Technology, Akure, Ondo State, Nigeria.

• P. A. Adeduntan

  Department of Agricultural and Environmental Engineering, Federal University of Technology, Akure, Ondo State, Nigeria.

Over the years, excessive energy consumption is one of the major problems associated with burnt brick production. This study assessed the characteristics of burnt bricks containing sawdust and wood ash as additive. Trial test was prepared from standard mix. It was done in different percentage of additives (0%, 10%, 20%, 30%, 40% and 50%) blend of sawdust and wood ash. One hundred and thirty- two (132) brick samples were cast out of which 99 were used for compressive strength. Specimen samples were fired at temperature 1100^oC. The result obtained showed that the highest compressive strength obtained in the control samples with 6.05 N/mm², sawdust with 3.05 N/mm² and wood ash 1.58 N/mm² when fired at 1100^oC. It was observed that there was a decrease in compressive strength as the percentage of sawdust increases and wood ash increases. The research concluded that regarding the compressive strength, the samples met the requirement specified by (IS: 1077) at temperatures of 800^oC, 900^oC, 1000^oC and 1100^oC considered to have good resistance to abrasion. Bricks with those parameters are suitable for use in the construction of building as a walling material. It was also concluded that samples with additives are more stabilized before firing than the control, though higher strength was obtained in the control than samples with additives and both met the standard specification. It is recommended that the firing temperature of bricks made with sawdust and wood ash should not exceed 1100^oC to avoid distortion.

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