Effects of Mineral Admixtures on Rheological Properties of Calcium Aluminate Cement Slurry with Low Water-Binder Ratio

doi:10.16552/j.cnki.issn1001-1625.2025.0435

Abstract

Abstract: Calcium aluminate cement has the advantages of high early strength and excellent fire resistance, and is widely used in emergency rescue and high temperature environment. The rheological properties of calcium aluminate cement are very important for on-site construction. In this study, granulated blast furnace slag powder and silica fume were added to prepare calcium aluminate cement composite slurry (hereinafter referred to as slurry), and its rheological properties were measured. The influence mechanism of granulated blast furnace slag powder and silica fume on rheological properties was studied by measuring Zeta potential, hydration heat, low field nuclear magnetic resonance relaxation signal, water film thickness and flocculation structure. The results show that the effect of granulated blast furnace slag powder on the yield stress of slurry is obvious within 10%(mass fraction), while the effect of silica fume on the yield stress of slurry is not obvious. With the increase of the content of granulated blast furnace slag powder, the plastic viscosity value of the slurry increases significantly, and with the increase of the content of silica fume, the plastic viscosity value of the slurry decreases gradually. Granulated blast furnace slag powder can accelerate hydration and enhance the signal of gel pore peak. After adding silica fume, the relaxation signal intensity is significantly enhanced, the total porosity is reduced, and the pore structure is optimized. The presence of granulated blast furnace slag powder and silica fume significantly reduces the Zeta potential value and electrical conductivity of the slurry. Silica fume can reduce the amount of flocculated structure and improve the state of slurry accumulation, so as to release more excess water in the system and increase the thickness of water film, while granulated blast furnace slag powder is the opposite.

Key words: calcium aluminate cement, granulated blast furnace slag powder, silica fume, rheological property, water film thickness, flocculated structure

CLC Number:

TU528.7

LIU Fangning, LIU Jian, LYU Liangsheng. Effects of Mineral Admixtures on Rheological Properties of Calcium Aluminate Cement Slurry with Low Water-Binder Ratio[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(11): 4080-4091.

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