Cement hydration and durability of low sulfide tailings-based renders: A case study in Moroccan constructions |
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| Affiliation: | 1. Laboratory of Civil and Environmental Engineering, Université de Lyon, INSA-Lyon, 20 av. A. Einstein, F-69621 Villeurbanne cedex, France;2. Laboratoire de Chimie des Matériaux et de l’Environnement, Faculté des Sciences et Techniques, Université Cadi Ayyad, BP 549/40000 Marrakech, Morocco;3. UQAT, 445 boulevards de l’université, Rouyn-Noranda, Québec, Canada;1. Jiangsu Institute of Parasitic Diseases, Key Laboratory of Parasitic Disease Control and Prevention (Ministry of Health), Jiangsu Provincial Key Laboratory of Parasite Molecular Biology, Wuxi 214064, People''s Republic of China;2. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Shanghai 200025, People''s Republic of China;3. Eryuan Institute for Schistosomiasis Control, Eryuan 671200, People''s Republic of China;4. Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, P.O. Box, CH-4002, Basel, Switzerland;5. University of Basel, P.O. Box, CH-4003, Basel, Switzerland;6. Ingerod 407, Brastad, Sweden;1. Higher Institute of Fine Arts, University of Sousse, Station Square, 4000 Sousse, Tunisia;2. Research Unit of Geosystems, Georessources, Geoenvironments, Department of Earth Sciences, Faculty of Sciences of Gabes, University of Gabes, 6072 Gabes, Tunisia;3. Laboratory of Mineral Resources and Environment, Department of Geology, Faculty of Sciences of Tunis, University of Tunis El Manar, 1060 Tunis, Tunisia;4. North Carolina State University, Department of Nuclear Engineering, Raleigh, NC 27695-7909, USA;1. Plant Production Systems, Wageningen University, P.O. Box 430, 6700AK Wageningen, The Netherlands;2. Department of Soil Science and Agricultural Engineering, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe;3. Soil Fertility Consortium for Southern Africa (SOFECSA), University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe;4. International Livestock Research Institute (ILRI), Box 30709, Nairobi 00100, Kenya;5. Center for International Forestry Research (CIFOR), P.O. Box 30677, Nairobi 00100, Kenya;1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. School of Civil Engineering, Jiangxi University of Technology, Nanchang, 330098 China |
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| Abstract: | 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. |
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| Keywords: | Low sulfide tailings Cement renders Cement hydration Durability |
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