Effiong John Uduak, Ede Anthony Nkem
Department of Civil Engineering, Covenant University, Ota 112233, Nigeria.
Materials (Basel). 2022 Aug 25;15(17):5848. doi: 10.3390/ma15175848.
Developing more resilient and sustainable physical infrastructure increases the demand for sustainable materials and strengthening approaches. Many investigations into strengthening RC beam structures have used either externally bonded (EB) or near-surface mounted (NSM) systems with synthetic fibre reinforced polymer composites. These synthetic fibres are unsustainable since they involve the use of nonrenewable resources and a large amount of energy. Research shows that natural fibre reinforced polymer (NFRP) composites may be an alternative to synthetic FRP composites in the strengthening of concrete beams. However, there is limited literature that validates their performance in various structural applications. Hence, the purpose of this paper is to explore the advances, prospects, and gaps of using EB/NSM NFRP techniques in strengthening concrete beams to provide areas for future research directions. The NSM FRP technique provides improved strengthening effects and mitigates the concerns associated with the EB system, based on a wider range of applications using synthetic FRPs. However, the NSM NFRP strengthening technique has been underutilized, though the EB NFRP system has been more commonly explored in reviewed studies. The knowledge gaps and areas for proposed future research directions are essential in developing work in emerging NFRPs and strengthening techniques for sustainable infrastructure.
开发更具韧性和可持续性的物理基础设施会增加对可持续材料和加固方法的需求。许多关于钢筋混凝土梁结构加固的研究都采用了外部粘贴（EB）或近表面安装（NSM）系统，并使用合成纤维增强聚合物复合材料。这些合成纤维是不可持续的，因为它们涉及使用不可再生资源和大量能源。研究表明，天然纤维增强聚合物（NFRP）复合材料在混凝土梁加固中可能是合成纤维增强聚合物（FRP）复合材料的替代品。然而，验证其在各种结构应用中性能的文献有限。因此，本文的目的是探讨使用EB/NSM NFRP技术加固混凝土梁的进展、前景和差距，为未来的研究方向提供领域。基于使用合成纤维增强聚合物（FRP）的更广泛应用，NSM FRP技术提供了更好的加固效果，并减轻了与EB系统相关的担忧。然而，NSM NFRP加固技术尚未得到充分利用，尽管在综述研究中对EB NFRP系统的探索更为普遍。知识差距和拟议的未来研究方向领域对于开展新兴NFRP和可持续基础设施加固技术的工作至关重要。
