Abstract
The current research is devoted to the studying of multi-walled carbon nanotubes (MWCNT) dispersion and its influence on the rheological properties of cement pastes. The pH and electrical conductivity test, zeta potential measurements, particle size analysis were performed for characterization of MWCNT dispersion. The MWCNT dispersion were tested during 1 month and presented the decrease of pH level from 8.89 to 8.02, increase of electrical conductivity from 2.00 to 2.75 mS/cm. The particle size analysis did not reveal the significant changes during 1 month of storage. The rheological test of nanomodified cement pastes were performed for concentration of MWCNT dispersion in the range from 0 to 0.5% by weight of cement. The decrease of yield stress by 30.7% and increase of plastic viscosity by 29.6% were obtained for cement paste modified by MWCNT dispersion in dosage of 0.25% by weight of cement. The changes in flow behaviour were established for cement pastes tested in 5 min after mixing and were not observed for cement pastes tested after 120 min of mixing.
Highlights
The investigation of rheological properties of cement systems enables to predict and manage by the properties of concrete mixture and cement mortar
This paper focuses on the investigation of multi-walled carbon nanotubes (MWCNT) dispersion properties during storage and its influence on rheological properties of cement pastes
The following conclusions are drawn in this study: 1. The MWCNT dispersion for modification of cement pastes with average particle diameter up to 294 nm was obtained in the course of research
Summary
The investigation of rheological properties of cement systems enables to predict and manage by the properties of concrete mixture and cement mortar. This field of research is becoming more relevant with the development of new generation concrete such as selfconsolidating (SCC), high-performance (HPC) and ultra-high performance concrete (UHPC). The changes in rheology of cement pastes with admixtures get the ability to clarify the mechanisms of their actions which determine their effectiveness in cement systems. In the research [6] authors investigated the dilatancy of cement paste with replacement of cement mass by micro silica. The replacement by 9% of micro silica leads to volume change of cement paste from 1.22% to 0% and the reduce of dilatancy
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