Abstract
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.
Highlights
Electrospinning has been viewed as a strong technique in nanomaterials science due to its simplicity and flexibility [1,2]
The influence of electrospun nanofibers on the 28-day mechanical properties is shown in Figure 3
It is evident that the mechanical strength rose significantly in most cases of electrospun-nanofiber-modified cement pastes
Summary
Electrospinning has been viewed as a strong technique in nanomaterials science due to its simplicity and flexibility [1,2]. The basic principle of this technique is the electrostatic interaction between two electrodes [3]. Electrospun nanofibers have many promising properties, such as their high strength, rough surface, high specific surface area, good functional abilities, and so forth. The feasibility of the industrial use of electrospun nanofibers has been clarified through numerous works. According to a literature review, various types of composite fiber membranes show a good ability for use in wastewater treatment, with applications in oil/water mixture separation [4,5], oil filtration [6], and heavy metal ion adsorption [7]. Nanofibers have impressive applications as treatments of skin carcinoma [8], tissue regeneration [9], and wound healing [10]
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