Development of alkali-activated composites from calcined iron-rich laterite soil

Development of Sustainable Alkali-Activated Mortars Using Fe-Rich Fayalitic Slag as the Sole Solid Precursor

“…The optimum packing of aggregates and the binder is believed to have reduced porosity and void in the mortar and increased the affinity between the mortar components, which is very important for the mechanical properties of the mortar. The strength achieved in AAFS2 is comparable to those obtained for alkali-activated composites made from calcined iron-rich laterite soil cured at elevated temperature (Kaze et al, 2021b).…”

Mineralogy and glass content of Fe‐rich fayalite slag size fractions and their effect on alkali activation and leaching of heavy metals

“…13,14 In addition to FS, other Fe-rich materials can include lead and zinc slags, laterite soils, bauxite residue slags, ferronickel slags, and Fe-silicate glasses. [15][16][17][18][19] The presence of glassy phase in water-quenched FS presents a possibility for its utilization as a precursor for AAMs. [21][22][23][24] Glassy phase is a phase with significant reactivity in FS, as the glass structure is more disordered in comparison to crystalline phases.…”

Towards optimization of mechanical and microstructural performances of Fe-rich laterite geopolymer binders cured at room temperature by varying the activating solution

“…24,51 These bands disappeared when applied a calcination temperature of 600 °C (LAT600) confirming the total transformation of kaolinite and goethite phases into metakaolinite and hematite respectively. 10,11,15,51…”

“…26,31,32 Several studies were conducted on the development of geopolymer from laterites and the influences of the following parameters, silica modulus namely (SiO 2 /Na 2 O and H 2 O/Na 2 O), calcination temperature (from 25 to 1000 °C), activating solution, the pre-curing time (4–24 h), the curing temperature (25–80 °C) and the curing time (24 or 48 h) on the mechanical and microstructural properties of the geopolymers were evaluated. 10,11,14,15,33–40 For example, Kaze et al 10,14,33 investigated and discussed the effect of silica modulus, curing temperature, activator types and calcination temperature upon strength development, setting time and microstructure of geopolymer binder from calcined corroded laterite at 600 °C with solid/liquid ratio maintained at 0.6 allowing acceptable workability. Later Lemougna et al 38 replaced the calcined laterite with calcite and ground granulated blast furnace slag up to 20 and 50 wt% and consolidated with alkaline activators with silica modulus ranging between 1.6 and 2.2.…”