Effect of slag nickel (FeNi3) as coarse aggregate on properties of no-fine concrete

Abstract

One of the industrial wastes of the B3 category is nickel slag. PT. Antam Pomalaa produces nickel slag annually of 1 million tons. It has been widely used as an embankment material or reclamation. This waste is hazardous for the environment if not used. An attempt to utilize it is to use it as an aggregate for no-fine concrete. In this research, no-fine concrete is designed by variations of cement ratio to slag. Unit weight and specific gravity test of slag aggregate were performed to calculate the use of nickel slag in a no-fine concrete mixture. The design of no-fine concrete was 1: 2, 1: 4, 1: 6, 1: 8, and 1; 10 by a water-cement ratio of 0.4. The samples of no-fine concrete were made in a 15x15x15 cm cube, with 3 samples of each variation. All the samples were cured for 28 days in the water. Compression tests were performed to analyze the compressive strength of no-fine concrete. The results showed slag nickel (FeNi3) increase unit weight and compressive strength of no-fine concrete. For practical uses no-fine concrete slag (NFC-S) of 1:6 qualifies as a material for city parks, while ratio 1:4 qualifies pavements for pedestrians.