Kepah Shell Waste as A Coarse Aggregate Substitution Material on Concrete Mixture

Abstract

This research uses kepah shell waste as a substitute for coarse aggregate. The purpose of this study is to determine the value of slump and compressive strength values in concrete variations. Variations of concrete consist of normal concrete, mixed shells of waste concrete with 5%, 10%, and 15% substitution of coarse aggregate. The concrete maintenance period was carried out for 7 days, 14 days, and 28 days. The results of the slump value research show that the lowest slump value is normal concrete, while the highest slump value is concrete with a mixture of 15% kepah shell waste. For the results of the compressive strength value, the highest compressive strength value is concrete with a mixture of 5% kepah shell waste. For the most economical cost with high quality of concrete compression strength is the concrete mixture with 5% of kepah shell waste. The greater the percentage of kepah shell waste, the cheaper the concrete price, but higher percentage of kepah shell waste will result a decrease in the quality of concrete.