The hydration and microstructure of ultra high-strength concrete with cement–silica fume–slag binder |
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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 |
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| Abstract: | This study investigated the flowability, compressive strength, heat of hydration, porosity and calcium hydroxide content of ultra-high-strength concrete (UHSC) with cement–silica fume–slag binder at 20 °C. The composition of the binder was designed using seven-batch factorial design method. The relationships between the binder composition and the properties were expressed in contours. Results showed that proper silica fume content could improve the flowability and compressive strength of UHSC, reduce the porosity and calcium hydroxide content of UHSC. Slag reduced the flowability, compressive strength, porosity, and calcium hydroxide content of UHSC to certain extent. The silica fume and slag demonstrated positive synergistic effects on the flowability and 3 d compressive strength, but have negative synergistic effects on the total heat of hydration, hydration heat when the time is infinitely long(P0), 56 d compressive strength, porosity and calcium hydroxide content of UHSC. |
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| Keywords: | Ultra high-strength concrete Hydration Microstructure Porosity Calcium hydroxide content Synergistic effect |
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