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Argane R.,INSA Lyon | Argane R.,Cadi Ayyad University | Benzaazoua M.,445 Boulevards Of Luniversite | Bouamrane A.,INSA Lyon | Hakkou R.,Cadi Ayyad University
Minerals Engineering | Year: 2015

Appropriate tailings management is one of the main requisites for sustainable development in the mining industry. This research study aims to assess the use of low sulfide or sulfide free tailings (LST) as aggregates for rendering mortars, focusing on their cement hydration and durability. An authentic case study in Moroccan constructions is additionally used to assess long term behavior of LST-based renders in actual field conditions. To address such needs, renders sampled from wall constructions and laboratory-made specimens were firstly characterized by means of thermo gravimetric analysis (TGA), X-ray diffraction analysis (XRD), scanning electron microscopy investigation (SEM) and mercury intrusion porosimetry (MIP). Renders were then exposed to standard detrimental agents (moisture, sulfate water and acid rain) to assess their long term behavior. Experimental results confirmed that LST-based renders seem to involve different cement hydration processes, which lead to larger pore size distribution and lower CSH and portlandite content. These observations significantly influence their susceptibility to cracking and sulfate attack resistance. © 2014 Elsevier Ltd All rights reserved.

Argane R.,University Claude Bernard Lyon 1 | Argane R.,Cadi Ayyad University | El Adnani M.,Ecole Nationale Superieure des Mines de Rabat Avenue | Benzaazoua M.,University Claude Bernard Lyon 1 | And 5 more authors.
Environmental Science and Pollution Research | Year: 2016

In some developing countries, base-metal residues that were abandoned in tailing ponds or impoundments are increasingly used as construction material without any control, engineering basis, or environmental concern. This uncontrolled reuse of mine tailings may constitute a new form of pollution risks for humans and ecosystems through metal leaching. Therefore, the aim of the current study is to assess mine drainage, metal mobility, and geochemical behavior of two abandoned mine tailings commonly used in the upper-Moulouya region (eastern Morocco) as fine aggregates for mortar preparation. Their detailed physical, chemical, and mineralogical properties were subsequently evaluated in the context of developing appropriate alternative reuses to replace their conventional disposal and limit their weathering exposure. The obtained results showed that both tailings contain relatively high quantities of residual metals and metalloids with lead (ranging between 3610 and 5940 mg/kg) being the major pollutant. However, the mineralogical investigations revealed the presence of abundant neutralizing minerals and low sulfide content which influence mine drainage geochemistry and subsequently lower metals mobility. In fact, leachate analyses from weathering cell kinetic tests showed neutral conditions and low sulfide oxidation rates. According to these results, the tailings used as construction material in the upper-Moulouya region have very low generating potential of contaminated effluents and their reuse as aggregates may constitute a sustainable alternative method for efficient tailing management. © 2015, Springer-Verlag Berlin Heidelberg.

Argane R.,INSA Lyon | Argane R.,Cadi Ayyad University | Benzaazoua M.,INSA Lyon | Benzaazoua M.,445 Boulevards Of Luniversite | And 2 more authors.
Journal of Cleaner Production | Year: 2015

The reuse of some industrial by-products in the construction industry saves natural resources and energy, while at the same time reduces environmental problems related to their surface disposal. Mine tailings are currently among the largest industrial by-products in the world, and yet, only limited studies have been conducted to evaluate their reuse potential. Moreover, abandoned base-metal tailings are increasingly used in some developing countries for the manufacture of mortars without any control, engineering basis or environmental concern. In this study, an experimental program using mechanical tests, mineralogical investigations and leaching tests is presented to assess the use of low sulfide base-metal tailings, with varying properties, as fine aggregates for rendering and masonry mortars. An authentic case study illustrating their use in Moroccan construction is additionally presented. Overall, it was observed that the main properties affecting the performances of these tailings-based mortars are the residual Pb-Zn concentrations and the fine content of each tailing. The Pb-Zn fraction, when using the appropriate substitution level, may serve as an active set retardant improving mortars setting time. Theleaching of metals was also successfully stabilized in mortars. © 2015 Elsevier Ltd.

Argane R.,INSA Lyon | Argane R.,Cadi Ayyad University | Benzaazoua M.,INSA Lyon | Benzaazoua M.,445 Boulevards Of Luniversite | And 2 more authors.
Construction and Building Materials | Year: 2015

Abstract The management of mine tailings has become a worldwide environmental concern. In essence, with the increasing ecological disruptions related to tailings storage facilities, there is a pressing need to develop sustainable alternative methods for the management of these hazardous materials. In parallel, abandoned base-metal tailings that contain residual metals are increasingly used in some developing countries as aggregate for mortars without any control or environmental concern. Consequently, there is an additional necessity for improved knowledge of tailings eco-compatibility when reused as construction material. This paper approaches these issues by assessing the geochemical behavior and immobilization performances of two low sulfide tailings-based mortars, commonly used in the upper-Moulouya region (eastern Morocco) as surface finishing mortars. The mechanical and durability performances of these mortars were also presented to endorse their reuse potential. The obtained results showed firstly that the reuse of base-metal tailings with low sulfide content and relatively minor residual-metal concentrations (As ≈ 30 mg/kg, Cr ≈ 60 mg/kg, Pb ≈ 4500 mg/kg, Zn ≈ 250 mg/kg) generates mortars with good mechanical and durability performances. Additionally, all leaching tests results (batch test, acid neutralization analysis, selective dissolution, tank leaching test and weathering cell test) indicated that risks of metals release from tailings-based mortars are minor and their reuse as surface finishing renders may constitute a sustainable alternative method for efficient tailings management. © 2015 Elsevier Ltd.

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