INVESTIGATION INTO THE USE OF RAFFIA PALM ASH (RPA) IN CEMENT-BASED MATERIAL
Abstract
The production of cement releases a lot of greenhouse gases to the atmosphere, thereby leading to global warming and climate change. This study evaluated the potential use of the Raffia Palm Ash (RPA) in cement-based materials. RPA was produced from Raffia hookeri by incinerating the dried wastes such as the logs, the leaves, the fronds, the straws and the jute, excluding the seeds. Ordinary Portland cement (OPC) was replaced in a concrete mix ratio of 1:2:4 and water-cement ratio of 0.6. A total of forty-eight concrete cubes, three cubes per experimental point( 0%, 10%, 20% and 30% RPA replacement of Ordinary Portland cement ) were made and cured, submerged in water, in a concrete tank for 7, 14, 21, and 28 days ,respectively; and then tested for their compressive strength. Other tests conducted were sieve analysis tests, specific gravity test, fineness test and slump test. It was observed that the compressive strength decreased progressively with increased substitution of OPC with RPA. The same goes for the slump test. The 100% OPC concrete gave the highest compressive strength value of 22.54 N/mm2 at the 28th day. For the substituted mixes, the compressive strength tests results gave the optimum value of 20N/mm2 for 10% RPA replacement of OPC at the 28th day. By this result, RPA can be used potentially as a substitute for cement in cement-based materials to minimize the environmental problems associated with the disposal of the Raffia palm waste and global warming associated with cement production.
KEYWORDS: Raffia Palm Ash, cement, compressive strength, Concrete, global warming
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