纤维掺量对再生混凝土力学性能影响的研究进展

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

摘要: 在工程项目中应用再生混凝土，既保护了生态环境，又提高了废弃混凝土的利用率，满足了可持续发展的要求。但是，再生混凝土在力学性能上可能不及普通混凝土。为了提高再生混凝土的性能，增加其在工程领域中的普及和应用，在使用钢纤维、植物纤维和矿物纤维材料方面取得了显著进展。这些材料掺入到再生混凝土中以改善其机械性能。研究表明：1) 钢纤维提高了再生混凝土的强度、韧性和弹性模量；2) 植物纤维混凝土具有轻质、环保、韧性高、保温性能好等优点，但在碱性环境中会发生腐蚀，同时植物纤维吸水能力强，导致湿胀干缩现象；3) 玄武岩纤维的制作成本相对较低，掺入适量的玄武岩纤维可以改善再生混凝土的力学性能。

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) 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, 3) 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.