Bleeding is caused by the poor water retention performance of freshly mixed concrete, where a portion of the mixing water is secreted from the slurry and accumulates on the surface until the cementitious material slurry is fully solidified.
This affects the quality of the concrete; False setting is an abnormal initial solidification or premature hardening phenomenon of cement, accompanied by heat release, which produces expansion joints and reduces the durability and compactness of concrete.
The causes of false setting and bleeding can be generally divided into internal and external factors.
The internal factors mainly depend on the demand for water during cement hydration, while the external factors depend on the environmental climate and concrete vibration process.
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