Influence of MWCNT/surfactant dispersions on the rheology of Portland cement pastes

This work studies the effect of MWCNT/surfactant aqueous dispersions on the rheology of cement paste. Three types of surfactants (sodium dodecyl sulfate, cetylpyridinium chloride and triton TX-100) were used to prepare cement pastes with and without MWCNT. Three rheological parameters were determined for each sample: static yield stress, yield stress, and viscosity. The first was measured directly, while the other two were obtained by fitting a Bingham model to the descending portion of a flow curve. Additionally, X-ray diffraction and isothermal calorimetry were used to follow the hydration reaction of cement during the first hour. It was found that the MWCNT/surfactant dispersions generate an overall shift to higher yield stress values while maintaining viscosity, suggesting a modification of the interparticle attraction. It was concluded that the triple interaction MWCNT-surfactant-cement governs the rheology of cement pastes. © 2018 Elsevier Ltd

• Fecha de publicación: 2018
• Institución: Universidad de Medellín
• Repositorio: Repositorio UDEM
• Idioma: eng
• OAI Identifier: oai:repository.udem.edu.co:11407/4576
• Acceso en línea: http://hdl.handle.net/11407/4576
• Palabra clave: A. Dispersion; A. Hydration; A. Rheology; C. Adsorption; D. Carbon nanotubes; Carbon; Cements; Chlorine compounds; Curve fitting; Elasticity; Hydration; Multiwalled carbon nanotubes (MWCN); Portland cement; Sodium dodecyl sulfate; Sulfur compounds; Surface active agents; Viscosity; X ray diffraction; Yarn; Yield stress; Aqueous dispersions; Bingham model; Cetylpyridinium Chloride; Hydration reaction; Interparticle attractions; Isothermal calorimetry; Portland cement paste; Rheological parameter; Dispersions
• License: http://purl.org/coar/access_right/c_16ec