Abstract
In this study, a new empirical Square-Box test was employed to evaluate the homogeneous flow performance of fiber-reinforced self-consolidating concrete (FR-SCC) under confined-flow conditions that are typical of repair applications. The Square-Box set-up consisted of a closed-circuit box, providing 2.4-m flow distance and a closed-surface cross section of 100-mm width and 200-mm height, equipped with 0 and 4 rows of reinforcing bar grids with 45-mm clear spacing. The flow performance was assessed in terms of dynamic stability and passing ability. The investigated mixtures were considered as diphasic suspensions of fiber-coarse aggregate (F-A > 5 mm) in suspending mortars containing particles finer than 5 mm. According to the experimental results, the dynamic segregation and blocking indices of the investigated mixtures were found in good agreements with characteristics of F-A combination and rheology of mortar. The investigated mixtures exhibited significantly higher blocking indices through the Square-Box set-up compared to those obtained using the L-Box test. Furthermore, the characteristics of F-A and rheology of mortar showed opposite effects on dynamic segregation assessed using Square-Box and conventional T-Box set-ups. Under confined flow conditions, higher dynamic segregation led to more dissimilar compressive strength values at different flow distances through the proposed Square-Box set-up. A new filling ability classification was established based on the experimental dynamic stability and passing ability results of the proposed empirical test.
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Acknowledgements
The authors wish to thank the financial support of the National Science and Engineering Research Council of Canada (NSERC) and the eight industrial partners participating in the NSERC Industrial Research Chair (IRC) on Development of Flowable Concrete with Adapted Rheology and Their Application in Concrete Infrastructures, held by Professor Ammar Yahia at the Université de Sherbrooke.
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NN: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Data curation, and Writing–Original draft. MH: Conceptualization, Methodology, Software, Validation, Formal analysis, Investigation, Resources, Data curation, Writing–Review original and edited drafts, and Supervision. AY: Conceptualization, Methodology, Formal analysis, Investigation. Resources, Writing–Review original and edited Drafts, Supervision, and Project administration, KHK: Conceptualization, Methodology, Formal analysis, Investigation, Writing–Review original and edited drafts, Supervision, and Project administration.
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Nouri, N., Hosseinpoor, M., Yahia, A. et al. Homogenous flow performance of steel fiber-reinforced self-consolidating concrete for repair applications: developing a new empirical set-up. Mater Struct 55, 223 (2022). https://doi.org/10.1617/s11527-022-02056-x
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DOI: https://doi.org/10.1617/s11527-022-02056-x