The influence of nickel slag aggregate concentration to compressive and flexural strength on fly ash-based geopolymer composite

Abstract

A molecular dynamics study of the role of molecular water on the structure and mechanics of amorphous geopolymer binders The Journal of Chemical Physics 145, 134706 (2016) Abstract. Fly ash-based geopolymer with nickel slag aggregate has been successfully produced. Fly ash and nickel slag were obtained from Bosowa Jeneponto Power Plant and PT. Vale Indonesia, respectively. This research aims to investigate the influence of nickel slag concentration to compressive strength, flexural strength, and microstructure of geopolymer composite. The increment of nickel slag aggregate on fly ash was relative to the weight of samples. Geopolymer composite were synthesized by using alkali activated method, cured at temperature of 70 °C for 1 hour. The resulting composites were left at room temperature for 14 days, before compressive and flexural strength were performed. The results showed that the addition of nickel slag aggregate was found to increase the compressive strength of the material. The optimum compressive strength was 14.81 MPa with the addition of 10% aggregate. The optimum flexural strength was 2.63 MPa with the addition of 15% aggregate.

Deformation Pattern of Nickel Slag Bonding on the Development of Concrete Construction

“…Figure 3 shows the crushed nickel slag aggregate due to the withstand of compressive force in the compressive strength test. The strong bond between nickel slag aggregate and Portland cement matrix is formed by the silica contents in the nickel slag surface [5,6,7]. The bigger and more contact between nickel slag surface and cement matrix, make the bond between Portland cement paste and aggregate will also be stronger.…”

“…Nickel slag contains many elements of silicates so that it can contribute to improving the interface between aggregate and cement paste. Thus nickel slag is very potential to be used as concrete aggregate and as a geopolymer aggregate application [5,6,7]. In this article, it is discussed in detail the production process, the formation pattern of cracks, and the morphological relation to the surface with the bonding formation between the composite of Portland cement and the nickel slag aggregate and mechanical properties such as the concrete compressive strength with the additional variety of nickel slag aggregate.…”