Tailored setting times with high compressive strengths in bassanite calcium sulfoaluminate eco-cements |
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| Affiliation: | 1. Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071, Málaga, Spain;2. CELLS-Alba synchrotron, Carretera BP 1413, Km. 3.3, E-08290, Cerdanyola, Barcelona, Spain;1. Key Laboratory of Ministry of Education for Coastal Disaster and Protection, Hohai University, Nanjing 210024, China;2. College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;3. College of Mechanics and Materials, Hohai University, Nanjing 211100, China;4. Institute of Advanced Materials, Nanjing Tech University, Nanjing 211816, China;5. Department of Civil and Architectural Engineering, Aarhus University, Aarhus 8000, Denmark;1. School of Materials and Mineral Resources, Xi’an University of Architecture & Technology, China;2. School of Civil Engineering, Xi’an University of Architecture & Technology, China;1. School of Engineering, University of Basilicata, Potenza, Italy;2. Department of Engineering and Applied Sciences, University of Bergamo, Bergamo, Italy;3. Consorzio INSTM, UdR ‘‘Materials and Corrosion”, Florence, Italy;4. Department of Mechanical, Energy and Management Engineering, University of Calabria, Rende, CS, Italy |
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| Abstract: | This work deals with the hydration of a calcium sulfoaluminate (CSA) eco-cement prepared with bassanite and different additives (type and content) at a fixed water/CSA ratio of 0.5. Pastes prepared with bassanite show high water demands, high viscosity values and short initial setting times which are related to the fast dissolution rate of bassanite and the subsequent precipitation of gypsum. These facts have a dramatic effect onto the mechanical strength values, and make necessary the addition of additives.Here, the addition of different amounts of specific retarders (polycarboxylate, tartaric acid and phosphonic acid) not only improved the workability of pastes and mortars, but also delayed the setting time by modifying the dissolution rates of the phase(s), and improved mechanical strengths. Finally, mortars with high compressive strengths (46 and 84 MPa at 1 and 7 days of hydration, respectively) and, chiefly, tailored setting times with high strengths have been prepared. |
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| Keywords: | X-ray diffraction analysis Hydration Compressive strength Sulfoaluminate |
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