Hybrid Steel Fiber Reinforced Concrete for Pavement Overlays (Prepublished)

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Title: Hybrid Steel Fiber Reinforced Concrete for Pavement Overlays (Prepublished)

Author(s): Pratik Gujar, Beng Wei Chong, Precious Aduwenye, Xijun Shi* and Zachary C. Grasley

Publication: Materials Journal

Volume:

Issue:

Appears on pages(s):

Keywords: hybrid recycled- and manufactured-steel fibers; mechanical properties; multiscale fiber reinforcement; overlay design; recycled steel fibers

DOI: 10.14359/51747871

Date: 6/11/2025

Abstract:
This study investigates the feasibility of utilizing a hybrid combination of recycled steel fibers (RSF) obtained from scrap tires and manufactured steel fibers (MSF) in concrete developed for pavement overlay applications. A total of five concrete mixtures with different combinations of MSF and RSF, along with a reference concrete mixture, were studied to evaluate fresh and mechanical properties. The experimental findings demonstrate that the concretes incorporating a hybrid combination of RSF with hooked-end MSF exhibit comparable or higher splitting tensile strength, flexural strength, and residual flexural strength to that of concretes containing only hooked-end MSF, straight MSF, and RSF. This enhanced mechanical performance can be ascribed to the multiscale fiber reinforcement effect that controls different scales (micro to macro) of cracking, thereby providing higher resistance to crack propagation. The concretes containing only RSF show lower splitting tensile strength, flexural strength, and residual flexural strength compared to concrete solely reinforced with straight MSF or other steel fiber-reinforced concrete (SFRC) mixtures due to the presence of various impurities in the RSF, such as thick steel wires, residual rubber, and tire textiles. Interestingly, blending RSF with hooked-end MSF overcomes these limitations, enhancing tensile strength, flexural strength, and residual flexural strength, while significantly reducing costs and promoting sustainability. Lastly, the findings from the pavement overlay design suggest that utilizing a hybrid combination of RSF with hooked-end MSF can reduce the design thickness of bonded concrete overlays by 50% compared to plain concrete without fiber reinforcement, making it a practical and efficient solution.


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