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From Lab Scale Spraying to Real Scale Shotcreting and back to the Lab

  • Before new mixes are sprayed in real scale applications, lab experiments have to be carried out to provide a basis for predicting a good performance in real scale. In many cases, to understand the correlations between the behavior in the lab and in real scale spraying, a further set of experiments after the real spraying is required. In this paper we present such a two way process for two new wet mixes, one with a very low tricalcium aluminate Portland cement and the other one with a CEM I with addition of ultra-fine calcite. Calorimetry and Shear-Modulus measurements were used in the lab to monitor hydration evolution. In the real scale spraying compressive strength was measured at periodic intervals up to 24 hours. The hydration of the sprayed samples was stopped at 3, 6 and 24 hours and samples were scanned with X-ray for the identification and quantification of the phases present. The results presented are used to discuss the extent to which lab experiments can predict the behavior of mixes in real scale and how small changes in the raw materials and the mixes can lead to quite different results.

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Metadaten
Author:Isabel Galan, Maria ThumannGND, Lukas G. Briendl, Rudolf Röck, Florian Steindl, Joachim Juhart, Florian Mittermayr, Wolfgang KusterleORCiDGND
URL / DOI:https://betong.net/wp-content/uploads/8th-Sprayed-Concrete_Web-Proceedings.pdf
ISBN:978-82-8208-060-6
Parent Title (English):8th International Symposium on Sprayed Concrete : Modern Use of Wet Mix Sprayed Concrete for Underground Support - Trondheim, Norwegen. - 11. - 14.06.2018
Editor:Thomas Beck, Synnøve A. Myren, Siri Engen
Document Type:conference proceeding (article)
Language:English
Year of Completion:2018
Release Date:2022/06/22
First Page:139
Last Page:153
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