Time-Stability Dispersion of MWCNTs for the Improvement of Mechanical Properties of Portland Cement Specimens

Materials

Natalia Álzate¹  LauraM. Echeverry-Cardona¹  Elisabeth Restrepo-Parra¹  Rogelio Ospina²  JorgeH. Quintero-Orozco² 

[1] Laboratorio de Física del Plasma, Universidad Nacional de Colombia, Sede Manizales, Manizales 170001, Colombia;Laboratory of Biological Materials Science and Semiconductors, Universidad Industrial de Santander, Bucaramanga 681012, Colombia;

关键词: MWCNTs;    dispersion;    sonication energy;    stability;    cement;   

DOI  :  10.3390/ma13184149

来源: DOAJ

【 摘 要 】

This study shows the energy optimization and stabilization in the time of solutions composed of H₂O + TX-100 + Multi-Wall Carbon Nanotubes (MWCNTs), used to improve the mechanical properties of Portland cement pastes. For developing this research, sonication energies at 90, 190, 290, 340, 390, 440, 490 and 590 J/g are applied to a colloidal substance (MWCNTs/TX-100 + H₂O) with a molarity of 10 mM. Raman spectroscopy analyses showed that, for energies greater than 440 J/g, there are ruptures and fragmentation of the MWCNTs; meanwhile at energies below 390 J/g, better dispersions are obtained. The stability of the dispersion over time was evaluated over 13 weeks using UV-vis spectroscopy and Zeta Potential. With the most relevant data collected, sonication energies of 190, 390 and 490 J/g, at 10 mM were selected at the first and the fourth week of storage to obtain Portland cement specimens. Finally, we found an improvement of the mechanical properties of the samples built with Portland cement and solutions stored for one and four weeks; it can be concluded that the MWCNTs improved the hydration period.

【 授权许可】

Unknown