INFLUENCE OF THE DISPERSION DEGREE OF CARBON NANOFIBERS ON THE MECHANICAL PROPERTIES OF CEMENT-BASED MATERIALS

To study the effects of different types of dispersions on the dispersion of carbon nanofibers (CNFs) and the mechanical properties of cement-based materials, polyvinylpyrrolidone (PVP), cetyltrimethylammonium bromide (CTAB), and sodium dodecylbenzene sulfonate (SDBS) as dispersants were used to disperse carbon nanofibers (CNFs) in cement-based materials and the influence on the mechanical properties was studied. The dispersion degree of CNFs in the prepared dispersion was characterized by the UV-Vis absorption test and Tyndall light test. The mechanical properties of CNFs reinforced cement-based composites were tested. The results show the best dispersion effect when PVP is used as a dispersant. The flexural and compressive strength of the specimen are the largest when PVP is used alone. When the content of CNFs is 0.3%, the flexural and compressive strength of the sampler each the maximum, indicating that the addition of CNFs can effectively reduce the deterioration of pore structure to make its internal system more stable and denser. © 2022, Politechnica University of Bucharest. All rights reserved.