This study presents an estimation of the mechanical property enhancing mechanism of electrospun-nanofiber-blended cementitious materials. Four types of electrospun nanofibers (NFs) were introduced into Portland cement: nylon 66 nanofibers, tetraethyl orthosilicate/polyvinylpyrrolidone nanofibers (TEOS/PVP), hybrid nanofibers containing carbon nanotubes (CNTs) and nylon 66, and hybrid nanofibers containing carbon nanotubes and TEOS/PVP (CNTs-TEOS/PVP NFs). Due to the mechanical strength results, there was an increase of 27.3% and 33.4% in compressive strength when adding TEOS/PVP nanofibers and the hybrid nanofibers containing carbon nanotubes and TEOS/PVP into the pastes, respectively. In addition, there was an increase of 25.7% and 54.3% in tensile strength when adding nylon 66 nanofibers and the hybrid nanofibers containing carbon nanotubes and nylon 66 into the pastes, respectively. The highest toughness of 61.7% was obtained by the paste blended with CNTs-TEOS/PVP NFs. The results observed from scanning electron microscopy, transmission electron microscopy, and thermogravimetric analysis clarified the change in the microstructure of the modified pastes, as well as the mechanical property enhancing mechanism of the electrospun-nanofiber-blended cementitious materials.

中文翻译：

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电纺纳米纤维添加剂对硬化水泥浆力学性能的影响

这项研究提出了电纺纳米纤维共混胶凝材料力学性能增强机理的估计。波特兰水泥中引入了四种类型的电纺纳米纤维（NFs）：尼龙66纳米纤维，原硅酸四乙酯/聚乙烯吡咯烷酮纳米纤维（TEOS / PVP），包含碳纳米管（CNT）和尼龙66的混合纳米纤维，以及包含碳纳米管和TEOS / PVP（CNTs-TEOS / PVP NFs）。由于机械强度的结果，当将TEOS / PVP纳米纤维和包含碳纳米管和TEOS / PVP的杂化纳米纤维分别添加到浆料中时，抗压强度分别增加了27.3％和33.4％。此外，分别增加了25.7％和54。当分别将尼龙66纳米纤维和包含碳纳米管和尼龙66的杂化纳米纤维添加到浆料中时，拉伸强度为3％。通过将糊剂与CNTs-TEOS / PVP NFs混合，可获得最高的61.7％的韧性。通过扫描电子显微镜，透射电子显微镜和热重分析观察到的结果阐明了改性糊的微观结构的变化，以及电纺纳米纤维共混胶凝材料的机械性能增强机理。