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On the porosity of low-clinker shotcrete and accelerated pastes

  • Although the number and size of interconnected pores have been identified as the most important aspects of concrete microstructure, comprehensive datasets on shotcrete porosity and pore size distributions are still scarce and their key controls are poorly investigated. In this study we investigate the effects of the spraying process, setting accelerator addition and mix design on the microstructure of real-scale dry- and wet-mix shotcrete and hand-mixed and sprayed accelerated pastes. A newly proposed deconvolution analysis of the pore size distributions, measured by mercury intrusion porosimetry, offers increased precision in determining the critical and median pore diameter parameters. In total >50 samples were analysed. Results show that the dry-mix shotcrete exhibits a shift towards coarser pore sizes (∼100–1 μm) than wet-mix shotcrete. Combinations of different supplementary cementitious materials are favourable for producing wet-mix shotcretes with refined pore structures. The addition of setting accelerators, up to 10 wt-% of binder mass, and the spraying process cause systematic variations in the pore volume and pore structure of (sprayed) paste and shotcrete.

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Metadaten
Author:Florian R. Steindl, Florian Mittermayr, Marlene Sakoparnig, Joachim Juhart, Lukas G. Briendl, Benedikt Lindlar, Neven Ukrainczyk, Martin DietzelORCiD, Wolfgang KusterleORCiDGND, Isabel Galan
DOI:https://doi.org/10.1016/j.conbuildmat.2023.130461
ISSN:0950-0618
Parent Title (English):Construction and Building Materials
Publisher:Elsevier
Place of publication:14
Document Type:Article
Language:English
Year of first Publication:2023
Release Date:2023/07/12
Tag:Durability; Mercury Intrusion; Porosity; SCMs; Shotcrete
Volume:368
Article Number:130461
Institutes:Fakultät Bauingenieurwesen
Begutachtungsstatus:peer-reviewed
research focus:Gebäude und Infrastruktur
OpenAccess Publikationsweg:Hybrid Open Access - OA-Veröffentlichung in einer Subskriptionszeitschrift/-medium
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International