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Ground Nut Husk Ash (GHA) as a Partial Replacement of Cement in Mortar
Abstract
This paper examines some properties of Ordinary Portland Cement (OPC) and Groundnut Husk Ash (GHA) mortar. The GHA was used as a partial replacement of OPC. The replacement levels of 0%, 2%, 4%, 6%, 8% and 10% ash were used. The chemical analysis of the ash carried out ascertained its pozzolanic properties. The initial and final setting times of the paste were 95 minutes and 11 hours respectively. These are higher than 45 minutes and 10 hours respectively for plain OPC. The pozzolanic mortar gave compressive strength in the range of 3.45 N/mm2 for 0% ash to 2.69 N/mm2 for 10% ash at 28 days curing period surpassing the minimum strength of 2.5 N/mm2 Specified for sandcrete blocks [I]. The density and water absorption capacity of the mortar decreased as the percentage of ash increased. OPC/GHA mortar is recommended for production of sandcrete blocks in hot weather climate. Further research on the permeability and durability are also recommended.
