Groundnut Shell Ash and Fly Ash Ternary Blended Cement in Making Plaster for Sustainable Construction
Abstract
The need to counter the over depletion of scarce resources, bring down the cost of materials and reducing environmental pollution has necessitated research into utilisation of many waste materials that can replace cement as a binder in plaster and concrete mixes. This study looks into the possibility of utilizing combined groundnut shell ash (GSA) and fly ash (FA), partly replacing cement in making plaster. To achieve this study, physical properties of GSA, FA and sand were tested following standard procedures of BS EN 197, BS EN 450-1, and BS EN 12620:2013 respectively. Thereafter, cement: sand plaster (1:3) is made with cement partially replaced with GSA and FA at 10%, 20%, 30%, and 40% in equal proportions. The plaster is tested for initial and final setting times and then compressive strength after 7, 14, and 28 days of curing. The specific gravities obtained were 2.54, 2.24, and 2.56 for GSA, FA and sand respectively, while their bulk densities were 840kg/m3, 1240kg/m,3 and 1510kg/m3 for GSA, FA, and Sand respectively. The initial and final setting times increased with the increase in percentage replacement of cement with the two ashes i.e. initial setting from 121 – 162 minutes and final setting from 228 – 296 minutes at 10% and 40% replacements. The compressive strength was reduced with an increase in ash proportions, i.e. 27.84 - 20.8mpa at 28 days but this strength was way above the minimum strength requirement for plastering masonry walls and also a great improvement from studies that had used GSA only whose strength was as low as 7.5Mpa. The results in this study provide a success story in using agricultural wastes by using FA to improve their properties hence enabling the replacement of expensive non-sustainable cement.
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