Development and evaluation of a novel geopolymer based on basalt rock waste and ground granulated blast furnace slag

Abstract

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Triaxial Stress-Strain Behavior of a Novel Basalt Rock Waste and Ground Granulated Blast Furnace Slag Geopolymer

“…In order to investigate the general geotechnical characteristics of basalt rock waste, several identification and characterisation tests such as particle size analysis, Atterberg limits analysis, specific gravity analysis and standard Proctor compaction tests were performed in a preliminary study by the authors (Nawaz et al, 2021). The particle size distribution curves for basalt rock waste and GGBFS are shown in Figure 1.…”

“…These findings are consistent with the results reported in past studies for other geopolymer sources, in which a decrease in compressive strengths beyond optimum value of alkaline concentration was attributed to increased viscosity of activator solution and the presence of unreacted silica and alumina (Barbosa et al, 2000;Hardjito et al, 2008;Jafari Nadoushan and Ramezanianpour, 2016;Williamson and Juenger, 2016). As the material became stiffer at 8M concentrations, it tend to be more brittle whereas the incomplete reactions, free silica in the system and increased viscosity of activator solution at 12M concentration samples resulted in a weak geopolymeric gel, thus contributing to a decrease in compressive strength as well as a more ductile behaviour (Barbosa et al, 2000;Hardjito et al, 2008;Nawaz et al, 2021;Williamson and Juenger, 2016). Furthermore, 12M samples were found to set quicker probably due to accelerated geopolymerisation reactions, which hindered the compaction process and workability.…”

“…The optimum values of the synthesis parameters required in the formation of the geopolymer were checked, in order to achieve higher compressive strength and better workability characteristics. The potential of basalt rock waste to be used as a precursor material on its own for geopolymer production was also investigated by the authors (Nawaz et al, 2021). The basalt rock waste being high in silica (51.1%) and alumina (15.8%) content did promote geopolymerisation; however, as calcium oxide content was relatively low, the strength gain upon geopolymerisation was small (around 2 MPa).…”

Effects of Alkaline Activator Solution on Concrete Mixed with Sugarcane Bagasse Ash and Ground Granulated Blast Furnace Slag

“…To evaluate the influence of cement alkalinity on the pore solution chemistry, cement paste specimens were prepared and admixed with fixed quantity of sodium chloride and various dosages of alkalinity (in the range of 0.4 to 1.4% Na2O equivalent). The pore solution was extracted and analyzed to determine the OH -, Cland SO4 concentrations [13][14][15][16].…”