Microstructural characterisation, physical and chemical properties of Rice husk ash as viable pozzolan in building material: A case study of some Nigerian grown rice varieties
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Date
2018
Authors
Abiodun, Y.O.
Jimoh, A.A.
Journal Title
Journal ISSN
Volume Title
Publisher
Nigerian Journal of Technology
Abstract
Recycling of agricultural wastes such as rice husk ash as pozzolan is being increasingly encouraged, particularly in
developing countries. In this paper, preliminary investigation on the physical and chemical compositions of rice husk
ash using different techniques was carried out. Scanning Electron Microscopy (SEM) images of the rice husk ash
showed residual pores to be distributed within the ash sample, indicating that the silica is a highly porous material
with a large internal surface area. Samples burnt at 4000C for 6 hours and 6000C for 4 hours for ‘Bukus’ and ‘Soro/
Olomo nla’ show aggregates with clearly defined layers of loose flakes compared to ‘Faro 58’. The Energy dispersive xray spectroscopy (EDX) analysis of rice husk ash performed to determine percentages of silica present in the samples
were graphically represented. Nine elements (Al, Si, K, Ca, Br, Fe, Mg, Na, Mn) and their corresponding oxides (Al2O3,
SiO2, K2O, CaO, Br, Fe2O3, MgO, Na2O, MnO) were detected with varying concentrations. The three varieties, on the
average possess good silica content of over 50% considering the two varied temperature and time. Therefore, the
chemical analysis results show that burning at combustion temperature of 6000C for 4hrs, gives optimal result than at
4000C for 6hrs because all the samples show high Silica content (Faro 58; 61.9, Bukus; 62.6 and Soro/Olomo nla;
59.5).
Description
Scholarly articles
Keywords
Rice husk ash , Scanning electron microscopy , Energy dispersive x - ray spectroscopy , Recycling of agricultural wastes , Research Subject Categories::TECHNOLOGY
Citation
Abiodun, Y.O., & Jimoh, A.A. (2018). “Microstructural characterisation, physical and chemical properties of Rice husk ash as viable pozzolan in building material: A case study of some Nigerian grown rice varieties’’, Nigerian Journal of Technology, 37(1): 71-77