A novel and greener sequential column leaching approach for the treatment of two different Greek laterites

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

“…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.…”

“…26,31,32 Several studies were conducted on the development of geopolymer from laterites and the inuences 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][34][35][36][37][38][39][40] For example, Kaze et al 10,14,33 investigated and discussed the effect of silica modulus, curing…”