Abstract
Slag nickel is a by-product which causes environmental degradation and conventional slag is widely used as coarse aggregate in concrete. This research, therefore, used the newest slag type (FeNi4) from PT Antam Pomalaa as fine aggregate in natural sand and determine the effect of the combination on the optimum compressive strength of concrete. Moreover, the results obtained were compared with the use of only natural sand in concrete. The procedure involved varying the percentage of the slag mixed with the natural sand by weight at 0%, 25%, 50%, 75%, and 100% with each sample designed to have minimum compressive strength higher than 20 MPa at 28 days. Furthermore, a compressive strength test was conducted to determine the optimum combination to achieve the best value and the results showed 25% of nickel slag variation to be the best while other variations, 50%, 75%, and 100%, experienced a reduction of 8.96%, 11.85%, and 12.19% respectively in comparison with the normal concrete. This, therefore, means the use of Ferro-nickel slag (FeNi4) has the ability to increase the strength and reduce the weight of concrete.
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