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Volume 16
Issue 18
10.3390/ma16186295
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Article

Stabilization of Chromium Waste by Solidification into Cement Composites

by
Cherif Belebchouche
1,2,3,*,
Salah-Eddine Bensebti
1,2,
Chaima Ould-Said
4,
Karim Moussaceb
3,
Slawomir Czarnecki
5,* and
Lukasz Sadowski
5
1
Department of Civil Engineering, Faculty of Sciences of Technology, Frères Mentouri Constantine 1 University, Constantine 25000, Algeria
2
Materials and Durability of Constructions Laboratory, Faculty of Sciences of Technology, Frères Mentouri Constantine 1 University, Constantine 25000, Algeria
3
Laboratory of Materials Technology and Process Engineering, Faculty of Technology, University of Bejaia, Bejaia 06000, Algeria
4
Laboratory of Biology and Physiology of Organisms (LBPO), Faculty of Biological Sciences, USTHB, BP 32 El-Alia, Bab Ezzouar 16111, Algeria
5
Department of Materials Engineering and Construction Processes, Wroclaw University of Science and Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland
*
Authors to whom correspondence should be addressed.
Materials 2023, 16(18), 6295; https://doi.org/10.3390/ma16186295
Submission received: 9 August 2023 / Revised: 4 September 2023 / Accepted: 13 September 2023 / Published: 20 September 2023
(This article belongs to the Special Issue Advanced Construction Materials and Processes in Poland)
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Abstract

This article deals with the study of hazardous chromium leaching, stabilized/solidified by cement CEM II after 28 days of curing, in an acidic environment. The mortars subjected to this study were investigated by X-ray diffraction (XRD) characterization to evaluate the influence of chromium waste on their mineralogical structure. In the study range (0.6–1.2%), increasing the mass percentage of Cr2O3 in the mortars indicates that chromium accelerates the hydration process and setting of the mortar and increases the mechanical strength of the mortars compared to the control sample. It was observed that the release of chromium during the Toxicity Characteristic Leaching Procedure (TCLP) test and the efficiency of the stabilization/solidification process depended on the initial Cr concentration and the leaching time. The use of XRD allowed the identification of new crystallized phases in the cement matrices, namely, CaCrO4·2H2O and chromium–ettringite Ca6Cr2(SO4)3(OH)12·26H2O, which confirms the immobilization of chromium and the efficiency of the stabilization/solidification process. In this research, the release mechanism was found to be primarily a surface phenomenon by modeling the experimental data (dissolution or precipitation).
Keywords: hazardous chromium wastes; acidic environment; cementitious materials; leaching hazardous chromium wastes; acidic environment; cementitious materials; leaching

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MDPI and ACS Style

Belebchouche, C.; Bensebti, S.-E.; Ould-Said, C.; Moussaceb, K.; Czarnecki, S.; Sadowski, L. Stabilization of Chromium Waste by Solidification into Cement Composites. Materials 2023, 16, 6295. https://doi.org/10.3390/ma16186295

AMA Style

Belebchouche C, Bensebti S-E, Ould-Said C, Moussaceb K, Czarnecki S, Sadowski L. Stabilization of Chromium Waste by Solidification into Cement Composites. Materials. 2023; 16(18):6295. https://doi.org/10.3390/ma16186295

Chicago/Turabian Style

Belebchouche, Cherif, Salah-Eddine Bensebti, Chaima Ould-Said, Karim Moussaceb, Slawomir Czarnecki, and Lukasz Sadowski. 2023. "Stabilization of Chromium Waste by Solidification into Cement Composites" Materials 16, no. 18: 6295. https://doi.org/10.3390/ma16186295

APA Style

Belebchouche, C., Bensebti, S.-E., Ould-Said, C., Moussaceb, K., Czarnecki, S., & Sadowski, L. (2023). Stabilization of Chromium Waste by Solidification into Cement Composites. Materials, 16(18), 6295. https://doi.org/10.3390/ma16186295

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