Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih, Safae; Bekkouch, Nadia; Gharibi, El Khadir; Fagel, Nathalie; Elhamouti, Kamal; El Ouahabi, Meriam

doi:10.1186/s42834-019-0038-z

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Phosphogypsum waste as additives to lime stabilization of bentonite

Oumnih, Safae; Bekkouch, Nadia; Gharibi, El Khadir et al.

2019 • In Sustainable Environment Research

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https://hdl.handle.net/2268/243589

DOI
10.1186/s42834-019-0038-z

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Keywords :

Bentonite; Strätlingite; Microstructure; Phosphogypsum; gel; CSH; geopolymer; Cement; Clay; Waste recycling

Abstract :

[en] Waste recycling with increasing the lifecycle of resource is a novel approach for enhancing circular economy. Within this context, this study aims to give a second life cycle to phosphogypsum (PG) waste, which is a by-product from phosphoric acid manufacture, as useful resources. This study evaluates the sustainability of this harmful waste, which is accumulated in large stockpiles and becomes hazardous during storage, and to stabilize bentonite-based concrete intended for road construction. The effect of raw bentonite (Ca-Na montmorillonite), PG, and lime on the properties of cementitious materials has been investigated through various tests. The properties examined include chemistry (X-ray Fluorescence Spectrometry), mineralogy (X-ray Powder Diffraction and Fourier-Transform Infrared Spectroscopy), calorimetry (Differential Thermal Analysis/Thermogravimetry) and microstructure (Scanning Electron Microscopy) of the mortar based on different mixtures of bentonite, PG and lime. The result show that lime and PG addition involves in the formation of new nanocrystalline phases and the disappearance of certain minerals as portlandite. Calcium silicate hydrate gel appeared in the mixture with 8% of lime, whereas strätlingite was neoformed in the mixture with 8% of lime and 8% of PG. These nanocrystalline phases are responsible for enhancing mechanical strength through the pozzoloanic reaction.

Disciplines :

Earth sciences & physical geography
Chemistry

Author, co-author :

Oumnih, Safae ; Université de Liège - ULiège > Form. doct. sc. (géol. - paysage)

Bekkouch, Nadia ; Université de Liège - ULiège > Doct. sc. (géol. - paysage)

Gharibi, El Khadir

Fagel, Nathalie ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires

Elhamouti, Kamal

El Ouahabi, Meriam ; Université de Liège - ULiège > Département de géologie > Argiles, géochimie et environnements sédimentaires

Language :

English

Title :

Phosphogypsum waste as additives to lime stabilization of bentonite

Publication date :

December 2019

Journal title :

Sustainable Environment Research

ISSN :

2468-2039

Publisher :

Elsevier, Netherlands

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 20 January 2020

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