Effect of Carbon Nanotube and Styrene-Acrylic Emulsion Additives on Microstructure and Mechanical Characteristics of Cement Paste
Effect of Carbon Nanotube and Styrene-Acrylic Emulsion Additives on Microstructure and Mechanical Characteristics of Cement Paste
复制标题
碳纳米管和苯丙乳液添加剂对水泥净浆微观结构和力学性能的影响
DOI：
10.3390/ma13122807
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发表时间：
2020-06-01
期刊：
影响因子：
3.4
通讯作者：
Zhang, Zhijun
中科院分区：
文献类型：
--
作者：
Fan, Jie;Li, Gengying;Zhang, Zhijun
碳纳米管能有效地改善水泥石的力学性能，被认为是水泥材料的理想改性剂之一。然而，碳纳米管和水泥基体之间的界面相互作用是弱的。此外，碳纳米管很难分散在水泥浆中。为了克服这些不足，本研究首先将碳纳米管分散到苯丙乳液（SAE）中。然后将均分散CNT/SAE乳液掺入水泥浆体中。研究了CNT/SAE混杂体系对水泥石力学性能和微观结构的影响。为了比较的目的，还研究了单掺入CNT或SAE的水泥浆体的性质。结果表明，利用场发射扫描电子显微镜（FESEM）可以在水泥浆体中观察到CNT/SAE网络膜。这些网状膜可以桥接裂缝并细化水泥基质的孔隙。红外光谱和拉曼光谱分析表明，复合改性剂的界面结合力和载荷传递能力均优于单一改性剂。结果表明，CNT/SAE的复合掺加显著提高了水泥石的抗折强度。特别是，添加0.1%的碳纳米管和15%的SAE按质量水泥提高了21%和25%的水泥浆体的28天的抗折强度相比，单添加碳纳米管或SAE，分别。
Carbon nanotubes (CNTs) are considered as one of the ideal modifiers of cement materials, since CNTs can improve the mechanical properties of cement paste effectively. However, the interfacial interaction between CNTs and the cement matrix is weak. Moreover, it is difficult to disperse CNTs within cement paste. To overcome these shortages, in this study, CNTs were firstly dispersed into a styrene-acrylic emulsion (SAE). Then the homo-dispersion CNT/SAE emulsion was incorporated into cement paste. The effect of the CNT/SAE hybrid-system on the mechanical properties and microstructure of cement paste was studied. For purposes of comparison, the properties of cement paste mono incorporating CNTs or SAE are also investigated. The results show that CNT/SAE network films could be observed in cement paste by using a field emission scanning electron microscope (FESEM). These network films could bridge the cracks and refine the pores of a cement matrix. Infrared analysis and Raman spectroscopy show that the CNT/SAE hybrid modifier has stronger interfacial adhesion and better load transfer ability over the mono adding of CNTs and SAE emulsion. As a result, the hybrid addition of CNT/SAE significantly improved the flexural strength of cement paste. Especially, the addition of 0.1% CNTs and 15% SAE by mass of cement improved the 28-day flexural strength of cement paste by 21% and 25% as compared to the mono addition of CNTs or SAE, respectively.