Effect of slag fineness on bleeding of concrete

　　Bleeding is a common problem in concrete mixtures. There are many reasons for the occurrence of water bleeding, such as thick cement particles, too long coagulation time; Coarse aggregate, unreasonable grading, improper selection of water reducing agent, etc. High water-cement ratio and high sand ratio in concrete mixture ratio; There is also construction vibration and other aspects will cause concrete mixture of bleeding. The addition of slag powder is also a factor.

　　The water bleeding of concrete mixed with slag powder is related to the fineness of slag powder. When the slag powder with small surface area is mixed into concrete, the concrete will be delayed and bleeding after standing for a period of time. When the slag powder with large surface area was mixed into concrete, no matter it was out of the machine or after a period of time, there was no bleeding.

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