Transport properties of high-volume fly ash concrete: Capillary water sorption,water sorption under vacuum and gas permeability |
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| Authors: | P. Van den Heede E. Gruyaert N. De Belie |
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| Affiliation: | 1. Center for Durability & Sustainability Studies of Shandong Province, Qingdao University of Technology, Qingdao 266033, PR China;2. Institute of Concrete Structures and Building Materials, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany;3. Aedificat Institute Freiburg, 79100 Freiburg, Germany;1. Department of Materials Science and Engineering, Sir Robert Hadfield Building, The University of Sheffield, Sheffield S1 3JD, United Kingdom;2. Department of Civil and Structural Engineering, Sir Frederick Mappin Building, The University of Sheffield, Sheffield S1 3JD, United Kingdom;1. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium;2. Polymer Chemistry and Biomaterials Group, Department of Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium;3. Department of Chemistry, Royal Military Academy, Renaissancelaan 30, B-1000 Brussels, Belgium;1. Institute of Resilient Infrastructure, School of Civil Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom;2. HeidelbergCement Technology Center GmbH, Oberklamweg 2-4, 69181 Leimen, Germany;3. Empa, Laboratory for Concrete & Construction Chemistry, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland |
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| Abstract: | Studying concrete’s resistance to carbonation-induced corrosion usually involves exposing the material to CO2 for quite some time. To estimate the performance of high-volume fly ash (HVFA) concrete more quickly, two key properties governing this process can be studied, namely water penetrability and gas permeability. With respect to HVFA mixtures optimized for usage in an environment exposed to carbonation with wetting and drying, we adopted the latter approach. This paper presents a full assessment of concrete mixtures with varying fly ash amounts. A 50% fly ash mixture by mass with a binder content of 400 kg/m3 and a water-to-binder ratio of 0.4 had a lower capillary water uptake (?32.6%), water sorption under vacuum (?10.7%) and gas permeability (?78.9%) than a proper reference normally used in this environment. The fly ash applied had an excellent quality regarding loss on ignition (3.5%) and fineness (19% retained on a 45 μm sieve). |
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