Cui, X;
Chen, M;
Feng, J;
Zhang, T;
Zhang, M;
(2025)
Effect of cryogenic temperature on compressive and splitting tensile behaviour of industrial-recycled hybrid steel fiber reinforced ultra-high performance shotcrete.
Construction and Building Materials
, 479
, Article 141445. 10.1016/j.conbuildmat.2025.141445.
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Abstract
This study aims to investigate the compressive and splitting tensile behaviour of ultra-high performance shotcrete (UHPS) under cryogenic temperatures and explore the use of recycled steel fibers (RSF) as a replacement for industrial steel fibers (ISF) to reduce carbon emissions. To achieve this, while keeping the steel fiber volume fraction fixed at 2%, RSF replaced 0%, 50%, and 100% of ISF. The specimens were frozen at −10°C, −35°C, and −60°C, respectively, and immediately subjected to compression and splitting tension tests. The failure patterns, compressive stress-strain curves (with compressive strength and elastic modulus), and stress-displacement curves (with splitting tensile strength) of the specimens were measured at different temperatures. In addition, the effect of cryogenic temperature on the interfacial transition zone between the steel fibers and the matrix was analyzed by examining the appearance of the fibers pulled out under a Scanning Electron Microscope. The results indicate that when the temperature is decreased to −60°C, the compressive strength, elastic modulus, and splitting tensile strength increase by 20.6%−23.7%, 17.7%–23.0%, and 21.7%−34.5%, respectively. With the increase in fiber replacement, the embodied CO₂ emissions and embodied energy consumption decreased significantly, although the mechanical properties exhibited a downward trend. Given that all the compressive strength is above 120 MPa, the specimen with a 100% replacement rate achieves the lowest embodied CO₂ index, indicating the smallest carbon content per unit strength.
| Type: | Article |
|---|---|
| Title: | Effect of cryogenic temperature on compressive and splitting tensile behaviour of industrial-recycled hybrid steel fiber reinforced ultra-high performance shotcrete |
| DOI: | 10.1016/j.conbuildmat.2025.141445 |
| Publisher version: | https://doi.org/10.1016/j.conbuildmat.2025.141445 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Ultra-high performance shotcrete, Recycled steel fiber, Cryogenic temperature, Compressive behaviour, Splitting tensile behaviour, Interfacial transition zone |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10208560 |
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