期刊
CEMENT AND CONCRETE RESEARCH
卷 143, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2021.106379
关键词
Cement paste; Pore solution; Nanoparticles; Mixing
资金
- Chateaubriand Felllowship from the French embassy in the USA
This study investigates the impact of mixing intensity on the size and concentration of nanoparticles in quartz and cement systems. The results show that high mixing intensity leads to detachment of nano-hydrates from cement particles, which can only be stabilized and detected in the presence of superplasticizers.
In this work, we study the effect of mixing intensity on the size and concentration of nanoparticles in quartz and cement systems. We vary the local shear rate in the studied suspensions induced by mixing by either changing solid volume fraction or mixing speed. Our results obtained on quartz, cement and quartz-cement suspensions provide a master curve relating the concentration of nanoparticles in the pore solution as a function of the local shearing conditions computed at a micromechanical level. Our results suggest, in accordance with literature, that high mixing intensity is at the origin of a detachment of nano-hydrates from the surface of cement particles. These nanoparticles can be stabilized and therefore detected in the pore-solution only in the presence of superplasticizers, which inhibit their agglomeration to other particles.
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