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Concrete is a material that combines several materials such as cement, coarse and fine aggregates and water into one solid mass. To save on the use of cement, an innovation was carried out by utilizing quicklime ash and carbide waste as a partial replacement for cement. This study aims to determine the compressive strength of concrete using quicklime ash and carbide waste with variations of 5%, 10%, 15%. The method use in this study is experimental method (direct experiment in the laboratory), by determining the concrete mix design. Concrete curing is carried out at room temperature. The cylindrical test specimens used were 15 cm x 30 cm in diameter and 40 specimens with slump values between 11 cm. From the results of the average compressive strength of quicklime ash concrete at variations of 5%, 10% and 15% for 14 days with a yield of 22.4 MPa. For 28 days of age with a yield of 21.4 Mpa. The results of the average compressive strength of carbide waste concrete at variations of 5%, 10%, and 15% for 14 days with a yield of 22.3 MPa. For 28 days of age with a yield of 20.5 MPa. The conclusion of this study is that the addition of quicklime ash and carbide waste which exceeds the 10% limit will decrease the compressive strength of concrete due to differences in the fine properties of quicklime ash and carbide waste to cement which can cause a small cavity on the side of the specimen which can reduce the compressive strength of concrete.
Keywords : Quicklime ash, Concrete compressive strength, Carbide waste.
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