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Sulfate resistance of dry mix shotcretes with new binder composition

  • Improved understanding of the mechanisms underlying deleterious chemical attacks is necessary to better predict the long-term performance and durability of shotcrete in aggressive environments. In the scope of the research project “ASSpC - Advanced and Sustainable Sprayed Concrete”, new durable and sustainable shotcretes and new test methods are developed. In order to increase shotcrete durability, the spray cement (specified in Austrian Guideline “Sprayed concrete”) used is substituted with supplementary cementitious materials (SCMs). However, in the past SCMs have seen only limited use in the application of dry-mix shotcrete. This contribution presents 6 new mix designs intended to be used for dry-mix shotcrete, each with varying amounts and types of SCMs, and compares their performance and sprayability with a commercially available spray cement. As sulfate attack is one of the major threats to shotcrete (e.g. in tunnelling), the resistance of the new mixes against sulfate attack is tested using a modified version of the Swiss sulfate test according to SIA 262/1:2013. This approach provides new insights into damaging mechanisms of dry mix shotcrete in sulfate-loaded environments

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Metadaten
Author:F. Steindl, F. Mittermayr, Maria ThumannGND, J. Juhart, Isabel Galan Garcia, Andre BaldermannORCiD, Lukas G. Briendl, M. Sakoparnig, Rudolf Röck, Wolfgang KusterleORCiDGND
Parent Title (English):ICCC 2019: 15th International Congress on the Chemistry of Cement, 16.-20.09.2019, Prague, Czech Republik
Document Type:conference proceeding (article)
Language:English
Year of first Publication:2019
Release Date:2022/03/04
First Page:3527
Last Page:3872
Institutes:Fakultät Bauingenieurwesen
Fakultät Bauingenieurwesen / Labor für Baustoffe
Begutachtungsstatus:peer-reviewed
research focus:Gebäude und Infrastruktur
Licence (German):Keine Lizenz - Es gilt das deutsche Urheberrecht: § 53 UrhG