When the water-reducing admixture is reduced by 0.1% to 0.2%, concrete mix liquidity becomes poor, and slump loss is accelerated. Relying on simple increase in sand ratio can not fundamentally solve the problem. But the phenomenon of exposed aggregate is quite significant, that is, the slurry can not be well wrapped around the gravel. Sometimes concrete in the condition of normal water-reducing admixture quantity is free of segregation phenomenon. In the practice of concrete production, the problem of poor cohesiveness of concrete in low strength grade is often encountered, such as exposed aggregate, slurry stone separation, poor water retention. The workability of concrete contains several indicators such as fluidity and cohesiveness.
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