A Review on Chemical Modification by using Sodium Hydroxide (NaOH) to Investigate the Mechanical Properties of Sisal, Coir and Hemp Fiber Reinforced Concrete Composites

ABSTRACT

This review article focused on the mechanical properties of sisal, coir and hemp fiber-reinforced concrete composites and several factors affecting the mechanical properties of natural fiber-reinforced concrete (NFRC) composites. Several treatments were applied to improve the surface of natural fiber for improving the strength and durability of composites. Recently researchers have investigated the mechanical properties by using NaOH treatments effects of sisal, coir and hemp fibers-reinforced concrete composite are highlighted in this study. A variety of recent studies showed that sodium hydroxide (NaOH) treatment plays a significant role in the adhesion of fiber concrete composites. It was found that NaOH improves the mechanical properties of the natural fiber-reinforced composites. Further, the treatment techniques for the modification of these natural fibers by improving the surface of these natural fibers are discussed. In the same way, previous research has investigated the effect of thermal stability and water absorption on the mechanical properties. Generally, this review article was aimed to highlight, gather, and explore the previous reported research studies leading the mechanical properties of sisal, coir and hemp fiber and its polymer composites to deliver a basis source of data and literature to expose it as composite materials like synthetic fibers.

摘要

本文综述了剑麻纤维、椰壳纤维和大麻纤维增强混凝土复合材料的力学性能以及影响天然纤维增强混凝土（NFRC）复合材料力学性能的几个因素. 为了提高复合材料的强度和耐久性，对天然纤维进行了表面改性处理. 近年来，研究人员对剑麻纤维、椰壳纤维和大麻纤维增强混凝土复合材料的力学性能进行了研究. 近年来的各种研究表明，氢氧化钠（NaOH）处理对纤维混凝土复合材料的粘结性能起着重要的作用. 结果表明，NaOH能提高天然纤维增强复合材料的力学性能. 此外，还讨论了通过改善这些天然纤维的表面来对其进行改性的处理技术. 同样，以往的研究也探讨了热稳定性和吸水率对材料力学性能的影响. 一般来说，这篇综述文章的目的是突出、收集和探索先前报道的剑麻、椰壳和大麻纤维及其聚合物复合材料力学性能的研究，以提供一个基本的数据和文献来源，使其成为合成纤维等复合材料.

KEYWORDS:

• Sodium hydroxide (NaOH)
• cellulose fibers
• mechanical properties
• fibers-reinforced composite
• environmental advantages

关键词:

• 氢氧化钠（NaOH）
• 纤维素纤维
• 机械性能
• 纤维增强复合材料
• 环境优势

Acknowledgments

The authors would like to acknowledge the support from the major project of science and technology of Yunnan Province, China under Grant No. 202002AE090010.

Additional information

Funding

This work has been supported by the Major Project of Science and Technology of Yunnan Province under Grant No. 202002AE090010