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Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetration

  • The reduction of clinker use is mandatory to lower the negative environmental impact of concrete. In shotcrete mixes, similarly to the case of conventional concrete, the use of supplementary cementitious materials (SCMs) and proper mix design allow for the substitution of clinker without compromising the mechanical properties. However, the impact of the substitution on the durability of shotcrete needs to be further assessed and understood. The results from the present study, obtained from real-scale sprayed concrete applications, show a reduction of the Ca2+ leaching and sintering potential of clinker-reduced shotcrete mixes due to the presence of SCMs. This positive effect, crucial for low maintenance costs of tunnels, is mainly related to a reduced portlandite content, which on the other hand negatively affects the carbonation resistance of shotcrete. Additionally, the hydration of SCMs positively influences the chloride penetration resistance presumably due to a combination of microstructural changes and changes in the chloride binding capacity. Differences found in the pore size distribution of the various mixes have low impact on the determined durability parameters, in particular compared to the effect of inhomogeneities produced during shotcrete application.

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Author:Marlene Sakoparnig, Isabel Galan, Florian Roman Steindl, Wolfgang KusterleORCiDGND, Joachim Juhart, Cyrill Grengg, Lukas G. Briendl, Andreas Saxer, Maria ThumannGND, Florian Mittermayr
DOI:https://doi.org/10.1617/s11527-021-01644-7
Parent Title (English):Materials and structures
Publisher:Springer Nature
Document Type:Article
Language:English
Year of first Publication:2021
Release Date:2022/02/16
Tag:Carbonate precipitation; Carbonation; Chloride penetration; Durability; Leaching; Shotcrete
Volume:54
Article Number:78
First Page:1
Last Page:23
Institutes:Fakultät Bauingenieurwesen
Fakultät Bauingenieurwesen / Labor für Baustoffe
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