Carbonation of calcium sulfoaluminate mortars |
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| Affiliation: | 1. Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO), Aarhus University, 8000 C Aarhus, Denmark;2. Laboratory for Concrete & Construction Chemistry, Swiss Federal Laboratories for Materials Science and Technology (Empa), 8600 Dübendorf, Switzerland;3. Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), Trondheim 7491, Norway;4. Aalborg Portland A/S, Cementir Holding S.p.A., 9100 Aalborg, Denmark;1. Buzzi Unicem S.p.A., Via L. Buzzi 6, 15033 Casale Monferrato (AL), Italy;2. Wilhelm Dyckerhoff Institut für Baustofftechnologie, Dyckerhoffstraβe 7, 65203 Wiesbaden, Germany;3. Dipartimento di Scienze ed Innovazione Tecnologica, Università del Piemonte Orientale A. Avogadro, Viale T. Michel 11, 15121 Alessandria, Italy;1. Global Research and Development, HeidelbergCement AG, Oberklamweg 2-4, 69181 Leimen, Germany;2. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Concrete and Construction Chemistry, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland;3. University of Grenoble Alpes, CNRS, Grenoble INP, SIMaP, 38000 Grenoble, France;1. Department of Civil and Environmental Engineering, University of California, Berkeley, CA, USA;2. School of Engineering, University of Basilicata, Potenza, Italy |
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| Abstract: | This study investigated potential physical and chemical parameters that could govern the carbonation rate of calcium sulfoaluminate (CSA) mortars and endeavored to elucidate the microstructural and chemical factors that govern CSA cement's carbonation rate. Experiments included: water absorption, oxygen diffusion, mercury intrusion porosimetry, quantitative X-ray diffraction, thermogravimetric analysis, accelerated carbonation, compression and flexure tests. Additionally, the carbonation process was investigated using thermodynamic modeling. The results show that CSA mortars carbonate much faster than Portland cement mortars and at approximately the same rate as calcium aluminate cement mortars. Additionally, CSA mortars carbonate slower with decreasing w/c, and the anhydrite content of the CSA mortars strongly affects the ye'elimite reaction kinetics which plays an important role in imparting carbonation resistance in CSA mortars. Finally, calcium sulfate additions to CSA clinker to produce CSA cement dilutes the clinker content and reduces the amount of CO2 that the CSA cement can ultimately bind. |
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| Keywords: | Calcium sulfoaluminate cement Calcium aluminate cement Portland cement Durability Carbonation Thermodynamic modeling |
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