Mahfoud Benzerzour
Duc Chinh Chu
Mouhamadou Amar
Joelle Kleib
Nor-Edine Abriak
Jaouad Nadah

The objectives of this study were to find out in detail how well granulated blast furnace slag (GBFS) could be replaced by flash-calcined sediment (SF sediment) in terms of hydration kinetics and mechanical-microstructural properties when developing an eco-friendly cement binder. The results indicated that the SF sediment substitution with a rate of ۲۵% wt significantly improved the hydration kinetics of cement compared to the reference. This contributed to a considerable enhancement of the mechanical-microstructural properties of the mortar containing the SF sediment. By comparison with the reference, the strength of multi-composite cement-based mortar increased by ۳۳% at ۲ days and by ۴.۵% at ۲۸ days, whereas its porosity decreased by ۱۶.۳۲% and by ۱۲.۴۴% for the same period. The SEM-EDS result showed that the SF sediment substitution did not significantly modify the chemical composition of the C-S-H phase, with a Ca/Si ratio range of ۱.۸۲ to ۲.۸۴ for both cement pastes. Moreover, Mg۲+ and Al۳+ions were two principal elements incorporated in C-S-H gels, with different ratios depending on the Ca/Si ratio of C-S-H gels. A novel model established from a combination of the curve fitting method and Power’s approach allowed for accurate prediction of the strength development of multi-composite cement-based mortars. Overall, the SF sediment substitution could be considered a promising option to develop a more eco-friendly cement binder, while the novel approach could be used as a reliable model for the strength prediction of blended cement. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۳-۰۹-۱۱-۰۲ Full Text: PDF

Flash-calcined Sediment; Pozzolanic; Cement; Hydration; Compressive Strength Prediction; Porosity.