Scientific conference in universities or research centers (Scientific conferences in universities or research centers)
Élaboration de nouveau matériau pour la construction routière à base des déchets industriels locaux : scories noires d’aciérie électrique et phosphogypse
[en] The Black Steel slag (Ss) and phosphogypsum (PG) are industrial wastes produced in Morocco. In order to reduce these two wastes and to evaluate their pozzolanic reactivity in the presence of water, they were incorporated into bentonite (B) mixed with lime (L). The studied mixtures (BLW, BL–PG–W and BL–PG–Ss–W) were analyzed by X-ray diffraction, Infrared spectroscopy, Raman spectroscopy and SEM/EDX analysis. Compressive strength tests were performed on hardened specimens. The results obtained show that the hydration kinetics of the B– L–W and B–L–PG–W mixtures are slow. The addition of PG to a bentonite––lime mixture induces the formation of new microstructures such as hydrated calcium silicate (C–S–H) and ettringite, which increases the compressive strength of the cementitious specimens. The addition of the Ss to a mixture composed of 8%PG and 8%L–B accelerates the kinetics of hydration and activates the pozzolanic reaction. The presence of C2S in the slag helps to increase the mechanical strength of the mixture B–L–PG–Ss. The compressive strength of the mixtures BL–W, BL–PG–W and BL–PG–Ss–W increases from 15 to 28 days of setting. After 28 days of setting, 8% of Sc added to the mixture 8% PG–8%L–B is responsible for an increase of the compressive strength to 0.6 MPa.
Lechheb, Mehdi; Laboratory of Physiqual Chemistry of Materials, Department of Chemistry, Faculty of Science and Techniques, Er-rachidia, Molay Ismaïl University, Meknes, Morocco
azerkane, Dounia; Laboratory of Applied Chemistry and Environment Team of Mineral Solid Chemistry, Faculty of Sciences, Mohammed First University, Oujda 60000, Morocco
Gharibi, El Khadir; Laboratory of Applied Chemistry and Environment Team of Mineral Solid Chemistry, Faculty of Sciences, Mohammed First University, Oujda 60000, Morocco
Taha, Yassine; Mining Environment and Circular Economy Program (EMEC), Mohammed VI Polytechnic University (UM6P), Lot 660.Hay Moulay Rachid, Ben Guerir 43150, Morocco
Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
El Ouahabi, Meriam ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires
Language :
French
Title :
Élaboration de nouveau matériau pour la construction routière à base des déchets industriels locaux : scories noires d’aciérie électrique et phosphogypse
Publication date :
27 May 2021
Event name :
Journées Doctorales en Sciences et Techniques JDOCST2021
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