Browsing by Author "Eke, Obinna Darlington"

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    Production of improved strength concrete using sugarcane bagasse ash and metakaoline as additives
    (Federal University of Technology, Owerri, 2023-09) Eke, Obinna Darlington
    This research work presents Prediction of Improved Strength Concrete Using Sugarcane Bagasse Ash And Metakaolin as Additives. Mathematical model was formulated using Ibearugbulems regression method. The materials used in this research were water, cement, metakaolin, sugarcane bagasse ash, fine aggregate, coarse aggregate and super plasticizer( CONPLAST SP 430).A total of 252 cubes of size 150 x 150 x 150mm were produced from 84 different mix ratios. The first 42 mix ratios were used for formulation of the model while the second 42 mix ratios were used to check the adequacy of the model. The concrete were cast and cured in a curing tank for 28, 60 and 90 days. The percentage replacement of cement with sugarcane bagasse ash and metakaolin adopted in this research ranges from 5% to 15% with constant water- cement ratio of 0.28. After curing, the concrete cubes were crushed in the universal testing machine. The results showed that the maximum compressive strength of the concrete cubes as 48.47MPa,which occurred at 15% replacement of cement with Sugarcane baggaseash/metakaolin and 60 days curing age , while the minimum compressive strength is 21.73 MPa at 5% replacement of cement with sugar cane baggase ash/metakaolin and28 days curing age. The percentage differences of laboratory and model predicted results were computed, and it was found that maximum percentage difference were 11.30%, 7.17%, and 13.84% respectively for 28, 60 and 90 days curing ages respectively. The minimum percentage differences were found as 0.67%,0.68% and 0.66% for 28, 60 and 90 days curing ages respectively. The model was checked for adequacy at 95% confidence level using statistical t-test and was found adequate. From the results, the strength of concrete can be classified as improved strength concrete when compared to normal strength concrete.