COMPARATIVE EVALUATION OF OPEN AIR BURNT AND CONTROLLED BURNT ISOBERLINIA DOKA SAWDUST ASH AS A SUPPLEMENTARY CEMENTITIOUS MATERIAL IN MASS CONCRETE
Abstract
Concrete is a major construction material, which is usually made by mixing cement, water, fine and coarse aggregates and sometimes admixtures in prescribed proportions. Communities around the world rely on concrete as a safe, durable and simple building material. With the ever increasing population in most developing countries and the corresponding increase in demands and need for infrastructural development, there is an urgent need to focus attention on functional but low-cost alternative construction materials. This study assessed and compared the properties of sawdust ash (SDA) produced by two different methods as a supplementary cementitious material in mass concrete to the conventional concrete. The sawdust ash used was prepared using open air and controlled burning (electric Muffle Furnace). It also investigated the physical properties and chemical composition of sawdust ash as well as the workability and compressive strength properties of the concrete produced by replacing 5%, 10% and 15%, by weight of Portland limestone cement with SDA. Slump test was carried out on the fresh concrete and compressive strength test on hardened concrete. The concrete cubes were tested at the ages of 7, 14, 21 and 28 days. The results showed that SDA is a good pozzolan with combined SiO2, Al2O3 and Fe2O3 of 74.22%. The slump decreased as the SDA content increased indicating that concrete became less workable as the SDA content increased. The compressive strength decreased with increasing SDA replacement. The compressive strength of concrete with SDA was lower at early stages but improves significantly up to 28 days. At 28 days of curing, concrete gained significant strength of 34.50N/mm2 for Open air burnt sawdust concrete and 34.00N/mm2 for controlled burnt sawdust concrete with 5% SDA replacement. It was concluded that open burnt sawdust has higher compressive strength than controlled burnt sawdust and both 5% SDA substitution for the methods is adequate to enjoy maximum benefit of strength gain.
KEYWORDS: Concrete, Sawdust Ash, Isoberlinia Doka, Portland limestone cement, Compressive Strength.
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