Influence of amorphous silica on the hydration in ultra-high performance concrete |
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| Affiliation: | 1. Fraunhofer–Institute for Silicate Research ISC, Neunerplatz 2, 97082 Würzburg, Germany;2. Inorganic Chemistry I, Universität Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany;3. Crystallography and X-ray Methods, Technische Hochschule Nürnberg Georg Simon Ohm, Wassertorstraße 10, 90489 Nürnberg, Germany;4. Building Materials, Bauhaus–Universität Weimar, Coudraystr. 11, 99423 Weimar, Germany;5. Chemical Technology of Advanced Materials, Julius Maximilian Universität, Röntgenring 11, 97070 Würzburg, Germany;1. Buzzi Unicem S.p.A, Via L. Buzzi 6, 15033 Casale Monferrato, Alessandria, Italy;2. Dipartimento di Scienze ed Innovazione Tecnologica, Università del Piemonte Orientale A. Avogadro, Viale T. Michel 11, 15121, Alessandria, Italy;3. Wilhelm Dyckerhoff Institut für Baustofftechnologie, Dyckerhoffstraβe 7, 65203 Wiesbaden, Germany;1. Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China;2. Collaborative Innovation Center for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189, China;1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, PR China;2. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla 65409, MO, USA |
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| Abstract: | Amorphous silica particles (silica) are used in ultra-high performance concretes to densify the microstructure and accelerate the clinker hydration. It is still unclear whether silica predominantly increases the surface for the nucleation of C–S–H phases or dissolves and reacts pozzolanically. Furthermore, varying types of silica may have different and time dependent effects on the clinker hydration. The effects of different silica types were compared in this study by calorimetric analysis, scanning and transmission electron microscopy, in situ X-ray diffraction and compressive strength measurements. The silica component was silica fume, pyrogenic silica or silica synthesized by a wet-chemical route (Stoeber particles). Water-to-cement ratios were 0.23. Differences are observed between the silica for short reaction times (up to 3 days). Results indicate that silica fume and pyrogenic silica accelerate alite hydration by increasing the surface for nucleation of C–S–H phases whereas Stoeber particles show no accelerating effect. |
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