Synergistic influences of ground granulated blast-furnace slag and silica fume on the viscosity of extremely low W/B cement pastes

Cong Thang Nguyen; Quoc Tri Phung; Van Tuan Nguyen

doi:10.15625/2525-2518/18103

Author affiliations

Authors

Cong Thang Nguyen Department of Building Materials, Hanoi University of Civil Engineering, 55 Giai Phong road, Ha Noi, Viet Nam
Quoc Tri Phung Expert Group Waste and Disposal, Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, 2400 Mol, Belgium
Van Tuan Nguyen Department of Building Materials, Hanoi University of Civil Engineering, 55 Giai Phong road, Ha Noi, Viet Nam

DOI:

https://doi.org/10.15625/2525-2518/18103

Keywords:

Ultra-high performance cement pastes, viscosity, silica fume, ground granulated blast furnace slag, synergistic effect

Abstract

Particularly with a low water/binder ratio, the synergistic effects of supplemental cementitious materials (SCMs) have drawn a lot of interest in improving the characteristics of cement-based products. The effects of SCMs, such as silica fume (SF) and ground granulated blast furnace slag (GGBS) with varying fineness, on the setting time, saturation point, and viscosity of ultra-high performance cement pastes (UHPCP), are examined experimentally in this work. 56 mixes with various SF and BFS substitutions and exceptionally low water/binder ratios (0.16, 0.20) were used in the experiments. This work demonstrates the synergistic effects of SCMs from several angles, including the UHPCP fresh characteristics. It is shown that carefully regulating the water/binder ratio, the BFS fineness, and most significantly the addition of an ideal SF content will have a beneficial synergistic effect on the fresh qualities of UHPCP. However, utilizing high BFS replacement is discouraged as it may have a negative impact on viscosity.

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