Influence of MWCNT/surfactant dispersions on the rheology of Portland cement pastes
Mendoza Reales O.A., Arias Jaramillo Y.P., Ochoa Botero J.C., Delgado C.A., Quintero J.H., Toledo Filho R.D.
Mendoza Reales, O.A., Universidade Federal do Rio de Janeiro, Brazil; Arias Jaramillo, Y.P., Universidad Nacional de Colombia, Colombia; Ochoa Botero, J.C., Universidad Nacional de Colombia, Colombia; Delgado, C.A., Universidad de Medellín, Colombia; Quintero, J.H., Universidad de Medellín, Colombia; Toledo Filho, R.D., Universidade Federal do Rio de Janeiro, Brazil
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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
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