Abstract
The aim of this study is to evaluate the influence of the layers of a laterite profile on the physical properties of the elaborated geopolymer cements. For this purpose, laterite soils were collected from different layers on a profile, and calcined at 650 °C. Calcined laterites were activated using alkaline solutions of 8, 10 and 12 M concentration. Raw materials and synthesis products were characterized using different analytical techniques comprising XRF, XRD, FTIR, PSD, TG/DTA, SEM/EDS and 29Si and 27Al MAS-NMR spectroscopy. Furthermore, mechanical and physical properties of 28 days old consolidated geopolymers were evaluated. The obtained results reveal that the E0-E3 specimens activated with 12 M alkaline solution developed the best characteristics than the C0-C3 and D0-D3 specimens consolidated with 8 and 10 M. Similar trends were observed in the water absorption, porosity and density values. Findings showed that the mineralogy of laterite soils varied from a layer to another one in a profile, which significantly influence the properties of the resulted geopolymer binder.
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