Efficient Multi-Composite Cement Made of Granulated Blast Furnace Slag (GBFS) and Flash-calcined Sediment

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

Authors

  • Mahfoud Benzerzour 1) Centre for Materials and Processes, Institut Mines-Télécom, IMT Nord Europe, F-59508 Douai, France. 2) Laboratoire de Génie Civil et Géo-Environnement, ULR 4515”LGCgE, Institut Mines-Télécom, University Lille, F-59000 Lille,, France
  • Duc Chinh Chu
    duc.chinh.chu@imt-nord-europe.fr
    1) Centre for Materials and Processes, Institut Mines-Télécom, IMT Nord Europe, F-59508 Douai, France. 2) Laboratoire de Génie Civil et Géo-Environnement, ULR 4515”LGCgE, Institut Mines-Télécom, University Lille, F-59000 Lille,, France
  • Mouhamadou Amar 1) Centre for Materials and Processes, Institut Mines-Télécom, IMT Nord Europe, F-59508 Douai, France. 2) Laboratoire de Génie Civil et Géo-Environnement, ULR 4515”LGCgE, Institut Mines-Télécom, University Lille, F-59000 Lille,, France
  • Joelle Kleib 1) Centre for Materials and Processes, Institut Mines-Télécom, IMT Nord Europe, F-59508 Douai, France. 2) Laboratoire de Génie Civil et Géo-Environnement, ULR 4515”LGCgE, Institut Mines-Télécom, University Lille, F-59000 Lille,, France
  • Nor-Edine Abriak 1) Centre for Materials and Processes, Institut Mines-Télécom, IMT Nord Europe, F-59508 Douai, France. 2) Laboratoire de Génie Civil et Géo-Environnement, ULR 4515”LGCgE, Institut Mines-Télécom, University Lille, F-59000 Lille,, France
  • Jaouad Nadah EQIOM LeLAB, CRT 1 Parc Vendí´me-460 Allée de l'Innovation, 59810 Lesquin,, France

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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 25% 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 33% at 2 days and by 4.5% at 28 days, whereas its porosity decreased by 16.32% and by 12.44% 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 1.82 to 2.84 for both cement pastes. Moreover, Mg2+ and Al3+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: 10.28991/CEJ-2023-09-11-02

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