Effect of bentonite on fly ash and bottom ash based engineered geopolymer composite

Abstract

Fly ash, bottom ash, and bentonite have potential to be used as geopolymer precursors, because they contain high silica and alumina. Until now there has been no research that combines these three materials as geopolymer materials. This research aims to incorporate bentonite as an aluminosilicate source in the fly ash and bottom ash based geopolymer. Geopolymer concrete was made by mixing precursors, alkaline activator, aggregate (gravel), superplasticizer, and water. The characterization of geopolymer concrete was carried out using XRD, XRF, and SEM-EDS. Then the compressive strength test was carried out. The SEM-EDS results show that the elements contained in geopolymer concrete are dominated by Si, Al, and O. The XRF results, the constituent compounds of geopolymer concrete are dominated by silica and alumina compounds. The XRD phase results formed are Quartz, Albite, and Hematite. The sample with code K6, which did not contain bentonite, had the highest compressive strength value of 9.57 MPa and 8.92 MPa at a drying time of 18 hours and 24 hours, respectively. This can happen because the addition of bentonite can reduce the retraction process. This also causes the porosity of the concrete to increase, thereby reducing its compressive strength.

Effect of Different Ceramic Waste Powder on Characteristics of Fly Ash-Based Geopolymer

“…Specifically, the identified phases include calcite (CaCO3), quartz (SiO2), hematite (Fe2O3), mullite (Al2O3•2SiO2), and plagioclase (anorthite CaAl2Si2O8 or albite NaAlSi3O8). It was also reported by previous research that phases like anorthite [36] and albite [37] emerged in the fly ash-based geopolymer.…”