Homogenous Flow Performance of Steel Fiber-Reinforced Self-Consolidating Concrete for Repair Applications: Developing a New Empirical Set-Up

Author

Naimeh Nouri
Masoud Hosseinpoor
Ammar Yahia
Kamal Khayat, Missouri University of Science and TechnologyFollow

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.

Recommended Citation

N. Nouri et al., "Homogenous Flow Performance of Steel Fiber-Reinforced Self-Consolidating Concrete for Repair Applications: Developing a New Empirical Set-Up," Materials and Structures/Materiaux et Constructions, vol. 55, no. 8, article no. 223, Springer, Oct 2022.

The definitive version is available at https://doi.org/10.1617/s11527-022-02056-x

Department(s)

Civil, Architectural and Environmental Engineering

Comments

Université de Sherbrooke, Grant None

Keywords and Phrases

Blocking; Dynamic segregation; Fiber-reinforced self-consolidating concrete; Repair; Rheology; Square-Box test

International Standard Serial Number (ISSN)

1359-5997

Document Type

Article - Journal

Document Version

Final Version

File Type

text

Language(s)

English

Rights

© 2023 Springer, All rights reserved.

Publication Date

01 Oct 2022