A preliminary investigation of incorporating cellulose nanocrystals into engineered cementitious composites

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Xiao Yang, Jian-Guo Ren, Lian-Xu Li, Zhen Wang, Qi-Hang Zhang, Qiao-Ling Liu
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引用次数: 0

Abstract

This paper explored the effects of various amounts of cellulose nanocrystals (CNCs), namely 0%, 0.1%, 0.2%, and 0.4% of binder weight, on the rheology, pore structure, mechanical properties, and 3D distribution of fibers of an engineered cementitious composite (ECC). The two rheological parameters, namely the yield stress and plastic viscosity, of the matrix containing the CNCs increased. Low-field nuclear magnetic resonance (LF-NMR) analysis, as a non-destructive method, proved that the addition of the CNCs to the ECC could reduce the porosity of the material and refine its pore size distribution. The addition of the CNCs enhanced the compressive strength of the ECC by 19.6%–33%. The results from uniaxial tensile tests showed incorporating the CNCs into the matrix could enhance the initial cracking strength and ultimate tensile strength of the ECC but reduce their tensile strain-hardening capacity. The optimal addition of 0.1% CNCs could effectively offset the decrease in strength due to increasing FA content, and maintain a relatively high level of tensile strain capacity of over 3%. Finally, X-ray micro-computed tomography (micro-CT) with ORS Dragonfly software was employed to reconstruct 3D images of the ECC to present the improvement in the fiber distribution due to the addition of the CNCs.
在工程水泥基复合材料中加入纤维素纳米晶体的初步研究
本文探讨了不同用量的纤维素纳米晶(CNCs)(即占粘结剂重量的 0%、0.1%、0.2% 和 0.4%)对工程水泥基复合材料(ECC)的流变学、孔隙结构、力学性能和纤维三维分布的影响。含有 CNC 的基体的两个流变参数(即屈服应力和塑性粘度)均有所增加。低场核磁共振(LF-NMR)分析作为一种非破坏性方法,证明了在 ECC 中添加氯化萘可降低材料的孔隙率并细化其孔径分布。添加 CNC 后,ECC 的抗压强度提高了 19.6%-33%。单轴拉伸试验结果表明,在基体中加入氯化萘可提高 ECC 的初始开裂强度和极限拉伸强度,但会降低其拉伸应变硬化能力。最佳添加量为 0.1% 的氯化萘可有效抵消因 FA 含量增加而导致的强度下降,并保持相对较高的拉伸应变能力(超过 3%)。最后,利用 ORS Dragonfly 软件进行了 X 射线显微计算机断层扫描(micro-CT),重建了 ECC 的三维图像,展示了添加 CNC 后纤维分布的改善情况。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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