Abstract
The rheometer was used to test the rheology of cement paste with and without nano-silica, and the fluidity and free water content were tested, the isothermal calorimetry of cement and C3S was tested and hydration products were monitored using Raman spectroscopy. A modified Bingham model was used to describe the rheological properties of the paste, and the effects of nano-silica with different particle sizes on rheological parameters including yield stress, plastic viscosity and thixotropy were derived. The results show that the fresh state properties of the cement paste vary with the particle size of nano-silica at the same dosage. The decrease in the particle size of nano-silica reduces the fluidity and free water content, but increases the yield stress and plastic viscosity. The flocculation and surface water absorption of nano-silica reduce the free water content at 5 minutes, which results in a decrease in flow diameter and an increase in yield stress. During the time evolution, the heat of hydration and Raman spectroscopy show that nano-silica with smaller particle size has higher nucleation and pozzolanic effect, that is, with the same dosage, nano-silica with small particle size provides more nucleation sites to form calcium silicate hydrate (C-S-H) seeds and to promote the hydration of C3S and the formation of C-S-H.
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Abbreviations
- CH:
-
Ca(OH)2
- FW%:
-
Free water content (%)
- m1 :
-
Sample weight (g)
- m2 :
-
Supernatant weight (g)
- mc :
-
Weight of powder in paste (g)
- mw :
-
Weight of water in paste (g)
- NS:
-
Nano-silica
- \(\underset{\cdot}{\eta}\) :
-
Plastic viscosity (Pa·s)
- γ :
-
Shear rate (s−1)
- τ :
-
Shear stress (Pa)
- τ 0 :
-
Yield stress (Pa)
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Acknowledgments
This work was financially supported by National Natural Science Foundation of China (Grant — NO. 51778269 and 51672106), and the Key Technology Research and Development Program of Shandong (NO. 2019GSF110002).
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Sun, H., Zhang, X., Zhao, P. et al. Effects of Nano-Silica Particle Size on Fresh State Properties of Cement Paste. KSCE J Civ Eng 25, 2555–2566 (2021). https://doi.org/10.1007/s12205-021-0902-3
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DOI: https://doi.org/10.1007/s12205-021-0902-3