Use of Pb blast furnace slag as a partial substitute for fine aggregate in cement mortar |
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Authors: | Nabajyoti Saikia Geert Cornelis ?zlem Cizer Carlo Vandecasteele Dionys Van Gemert Koenraad Van Balen Tom Van Gerven |
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Institution: | 1. Department of Chemical Engineering, Katholieke Universiteit Leuven, Willem de Croylaan 46, 3001, Leuven, Belgium 2. Department of Civil Engineering and Architecture, Instituto Superior T??cnico, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal 3. Department of Civil Engineering, Katholieke Universiteit Leuven, Kasteelpark Arenberg, 403001, Heverlee, Belgium
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Abstract: | The technical properties of cement mortars containing natural fine aggregate that is replaced by lead blast furnace slag at 25 and 35% level were assessed at fixed water-to-cement (W/C) ratio and at fixed flow table value. The leachabilities of some toxic elements from the cement mortars were also assessed to test the environmental suitability of the slag for use in preparation of cement mortar. At fixed W/C ratio, the strength of the mortar decreased with increase of the slag content. On the other hand, at fixed consistency, strength increased with increasing slag content in the mortar composition. The concentrations of some toxic elements in the leachates collected from the mortars containing slag were slightly higher than for the control mortar, but the concentrations in the leachates remained within the regulatory limits for recycling in construction applications. For most elements, leaching from a mortar containing 35% of slag was similar to that from a mortar containing 25% of slag. Therefore, 35% of natural sand can be beneficially replaced with Pb slag to produce cement mortar without affecting the mechanical and leaching properties studied in this work. |
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