椰纤维长度和含量对高强混凝土性能的影响

Effect of Coconut Fiber Length and Content on Properties of High Strength Concrete.

作者信息

Ahmad Waqas, Farooq Syed Hassan, Usman Muhammad, Khan Mehran, Ahmad Ayaz, Aslam Fahid, Yousef Rayed Al, Abduljabbar Hisham Al, Sufian Muhammad

机构信息

NUST Institute of Civil Engineering, National University of Sciences and Technology, Sector H-12, Islamabad 46000, Pakistan.

Department of Civil Engineering, Dalian University of Technology, Dalian 116024, China.

出版信息

Materials (Basel). 2020 Feb 28;13(5):1075. doi: 10.3390/ma13051075.

DOI:10.3390/ma13051075

PMID:32121125

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7084858/

Abstract

Recently, the addition of natural fibers to high strength concrete (HSC) has been of great interest in the field of construction materials. Compared to artificial fibers, natural fibers are cheap and locally available. Among all natural fibers, coconut fibers have the greatest known toughness. In this work, the mechanical properties of coconut fiber reinforced high strength concrete (CFR-HSC) are explored. Silica fume (10% by mass) and super plasticizer (1% by mass) are also added to the CFR-HSC. The influence of 25 mm-, 50 mm-, and 75 mm-long coconut fibers and 0.5%, 1%, 1.5%, and 2% contents by mass is investigated. The microstructure of CFR-HSC is studied using scanning electron microscopy (SEM). The experimental results revealed that CFR-HSC has improved compressive, splitting-tensile, and flexural strengths, and energy absorption and toughness indices compared to HSC. The overall best results are obtained for the CFR-HSC having 50 mm long coconut fibers with 1.5% content by cement mass.

摘要

最近，在建筑材料领域，向高强度混凝土（HSC）中添加天然纤维引起了极大的关注。与人造纤维相比，天然纤维价格低廉且本地可得。在所有天然纤维中，椰壳纤维具有已知的最大韧性。在这项工作中，对椰壳纤维增强高强度混凝土（CFR-HSC）的力学性能进行了探索。还向CFR-HSC中添加了硅灰（质量分数为10%）和高效减水剂（质量分数为1%）。研究了长度为25毫米、50毫米和75毫米的椰壳纤维以及质量分数为0.5%、1%、1.5%和2%的含量的影响。使用扫描电子显微镜（SEM）研究了CFR-HSC的微观结构。实验结果表明，与HSC相比，CFR-HSC的抗压强度、劈裂抗拉强度和抗弯强度以及能量吸收和韧性指标均有所提高。对于水泥质量含量为1.5%、椰壳纤维长度为50毫米的CFR-HSC，总体获得了最佳结果。