The fluidity showed a trend of first increasing and then decreasing with the addition of SF when the w/c ratio was 0.5, 0.6.
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Study on the Influence of Silica Fume (SF) on the Rheology, Fluidity, Stability, Time-Varying Characteristics, and Mechanism of Cement Paste.
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The sentences
The yield stress of the paste in the second period still showed an increasing trend, and the increase was greater than in the first period.