TY  - EJOU
AU  - Shi, Zhenqing 
AU  - Sun, Guomin 
AU  - Pang, Jianyong 

TI  - Research Progress on the Influence of Varying Fiber Contents on Mechanical Properties of Recycled Concrete
T2  - Structural Durability \& Health Monitoring

PY  - 2023
VL  - 17
IS  - 3
SN  - 1930-2991

AB  - 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.
KW  - Recycled concrete; fibers; mechanical properties; overview

DO  - 10.32604/sdhm.2023.022816