Characterization of Bambara nut shell ash (BNSA) in concrete production

Uwadiegwu, Alaneme George and Michael, Mbadike Elvis (2021) Characterization of Bambara nut shell ash (BNSA) in concrete production. Jurnal Kejuruteraan, 33 (3). pp. 633-646. ISSN 0128-0198


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The goal of achieving concrete with adequate durability properties in terms of reduced susceptibility to alkali-silica and mechanical-strength behaviour has led to several high-performance materials development. While the use of Bambara nut shell ash in concrete is gaining acceptance in various applications, the mineralogical composition of such by-product materials cannot be easily controlled as a manufactured pozzolan. In this research work, the characterization and use of BNSA in concrete production was investigated. A mix proportion of 1:3:6 with water cement ratio of 0.55 were used. The percentage replacement of cement with BNSA from 0-40%. Concrete cubes of 150mm × 150mm × 150mm of OPC/BNSA were cast and cured at 3, 7, 28, 60 and 90 days respectively. At the end of each period of hydration, three replicate concrete samples for each period of hydration were crushed and their average comprehensive strength recorded. The result for the compressive strength test indicated rise in percentage difference as the BNSA replacement ratio increases from 5% to 40% with a value of 20.69% to 46.53% respectively. The concrete density response showed slight increment in percentage difference with a value of 0.85% to 3.47% for BNSA replacement ratio of 5% to 40% respectively. The Poisson ratio test results obtained indicates percentage difference increase as the BNSA ratio increases from 5% to 40% with a value of 5.17% to 11.14% respectively. Furthermore, the young’s modulus of elasticity results obtained showed percentage difference rise from 9.4% to 14.17% as BNSA ratio increases from 10.81% to 29.412% as BNSA replacement ratio increases from 5% to 40% respectively. The results indicate satisfactory performance at 5% replacement.

Item Type:Article
Keywords:Compressive strength; Density; Poisson ratio; Young’s modulus of elasticity and modulus of rigidity; Bambara nut shell ash
Journal:Jurnal Kejuruteraan
ID Code:18768
Deposited By: ms aida -
Deposited On:08 Jun 2022 00:25
Last Modified:10 Jun 2022 01:47

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