A review on the properties of concrete reinforced with recycled steel fiber from waste tires

Abstract

In the construction industry, fibers have been added to concrete to improve the mechanical properties of concrete for decades. Steel fiber has been widely used as an additive fiber owing to the unique properties; it provides reinforced concrete. However, the large-scale production of steel fibers generates a large amount of CO2 and aggravates the depletion of natural resources. In response to the requirements of green environmental protection, some scholars have focused their attention on replacing industrial steel fibers with recycled steel fibers from waste tires (WTSF). It is found that WTSF can be used to reinforce the mechanical properties of concrete and even replace industrial steel fiber (ISF) in some engineering applications. The existing research results are summarized and discussed, with emphasis on the process of recycling WTSFs. This review not only has a great impact on the environment but also has fiber characteristics as well as the mechanical properties (compressive strength, tensile strength, and flexural strength) and durability of the concrete with WTSF. The purpose of this article is to review the existing literature with a critical attitude and summarize the existing related literature, which determines the research gap for those who are committed to this direction.