Open Access

REVIEW

Research Progress on the Influence of Varying Fiber Contents on Mechanical Properties of Recycled Concrete

by Zhenqing Shi¹, Guomin Sun¹, Jianyong Pang^2,*

1 College of Civil and Architecture Engineering, Chuzhou University, Chuzhou, China
2 Engineering Research Center of Underground Mine Construction, Ministry of Education (Anhui University of Science and Technology), Huainan, China

* Corresponding Author: Jianyong Pang. Email:

Structural Durability & Health Monitoring 2023, 17(3), 239-255. https://doi.org/10.32604/sdhm.2023.022816

Received 28 March 2022; Accepted 19 August 2022; Issue published 25 June 2023

Abstract

Applying recycled concrete for engineered projects not only protects the ecological environment but also improves the utilization rate of waste concrete to satisfy sustainable development requirements. However, the mechanical properties of recycled concrete are not as good as those of ordinary concrete. To enhance the former’s performance and increase its popularity and application in engineering fields, notable advances have been made by using steel, synthetic, plant, and mineral fiber materials. These materials are added to recycled concrete to improve its mechanical properties. Studies have shown that (1) steel fibers have a distinct reinforcing effect and improve the strength, toughness, and elastic modulus of recycled concrete; (2) the addition of synthetic fibers can improve the tension, crack resistance, and durability of concrete, but the size effect needs to be further explored and elaborated; (3) plant fiber concrete is lightweight and environmentally friendly and provides high toughness and good thermal insulation, but the fibers corrode in alkaline environments; in addition, plant fibers have high water absorption capacity, which leads to wet expansion and dry shrinkage phenomena, which need to be further studied; and (4) the cost of basalt fiber, a mineral fiber, is relatively low, and a suitable basalt content can improve the mechanical properties of recycled concrete to a certain extent.

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