Effect of CNFs on the mechanical properties and microstructure of early strength seawater sea-sand engineered cementitious composites
Effect of CNFs on the mechanical properties and microstructure of early strength seawater sea-sand engineered cementitious composites
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CNFs对早强海水-海砂工程胶凝复合材料力学性能和微观结构的影响
DOI：
10.1016/j.conbuildmat.2021.124961
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发表时间：
2021-11
影响因子：
7.4
通讯作者：
Lu Yiyan
中科院分区：
文献类型：
--
作者：
Wang Siyu;Lin Chenlong;Li Shan;Chen Miao;Lu Yiyan
碳纳米纤维是一种很有前途的提高水泥基复合材料力学性能的材料。因此，有必要分散CNF用于材料中。本文研究了三种表面活性剂在蒸馏水和海水中的应用。为了获得最佳分散条件，定量研究了不同类型和浓度的表面活性剂和超声处理时间对CNFs分散的影响。通过目视检查、透射电子显微镜（TEM）和紫外-可见（UV-Vis）光谱研究CNF悬浮液。研究了CNF改性早强型海水海砂工程水泥基复合材料（SS-ECCs）的抗压强度、抗拉强度和孔隙率等力学性能。此外，场发射电子扫描显微镜（SEM）被用来研究它们的微观结构。在用表面活性剂分散和超声处理后，在悬浮液中发现了单个纤维。海水对悬浮液的稳定性有不利影响。良好分散的CNF改善了水泥基复合材料的力学性能，抗压强度和抗拉强度分别增加了21-24%和16- 20%。拉伸应变能力增加了约两倍。孔隙率降低，孔结构得到细化。显微镜检查证明CNF也很好地分散在水泥基体中。结果表明，碳纳米纤维的掺入能显著提高水泥基复合材料的力学性能。
Carbon nanofibres (CNFs) are a promising material for improving the mechanical properties of cementitious composites. Thus, it is necessary to disperse CNFs for use in materials. In this study, three types of surfactants used in distilled water and seawater were investigated. To obtain the optimal dispersion conditions, the effects of different types and concentrations of surfactants and ultrasonic treatment times on the dispersion of CNFs were investigated quantitatively. The CNF suspensions were studied via visual examination, Transmission electron microscopy (TEM), and Ultraviolet–Visible (UV–Vis) spectroscopy. The compressive strength, tensile strength, and porosity were examined to evaluate the mechanical properties of CNF-modified early strength seawater sea-sand engineered cementitious composites (SS-ECCs). Moreover, field-emission electron Scanning microscopy (SEM) was used to study their microstructures. After dispersion with surfactants and ultrasonication, individual fibres were found in the suspension. Seawater adversely affected the stability of the suspensions. Well-dispersed CNFs improved the mechanical properties of the cementitious composites, with an increase in compressive and tensile strengths of 21–24% and 16–20%, respectively. The tensile strain capacity increased by approximately twofold. The porosity was reduced and the pores structure was refined. Microscopic examination proved that CNFs were also well dispersed in cement matrix. The results showed that the addition of CNFs could significantly improve the mechanical properties of cement-based composites.
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影响因子：
7.4
作者：
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DOI：
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