High-Quality Composite Concrete Based on Eco Materials from Nickel Slag Waste as an Implementation of Sustainable Infrastructure

Abstract

The nickel processing industry produces a large amount of solid waste in the form of nickel slag, which has the potential to pollute the environment if not properly managed and utilized. This study evaluates the use of nickel slag as a partial substitute for coarse aggregate in the production of high-strength concrete. Tests were conducted using cylindrical specimens with a diameter of 10 cm and a height of 20 cm, with variations in nickel slag content of 25%, 50%, and 75% of the total coarse aggregate. Based on the compressive strength test results, it was found that a 50% nickel slag composition was the most optimal variation, producing an average compressive strength of 46.31 MPa, which is an increase of 10.18% compared to the control concrete at 42.03 MPa. This improvement is influenced by the physical and chemical characteristics of the nickel slag, such as its rough surface that enhances interlocking between aggregate particles, as well as the presence of silica compounds that act as pozzolanic materials.

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