Self compacting concrete refers to concrete that can flow and compact under its own gravity, completely fill the formwork even with dense steel bars, and does not require additional vibration.
The concrete needs to have good ability to pass through the gaps between steel bars without segregation.
The water cement ratio of high-strength concrete is relatively low, and there are many cementitious materials.
The characteristics of high fluidity and non segregation require concrete to have high viscosity.
However, the high-rise pumping of concrete requires it to have low viscosity.
High viscosity can lead to difficulties in concrete pumping, and in severe cases, it can even cause pipe blockage and bursting.
Therefore, how to balance the high flow state and non segregation requirements of high-strength self compacting concrete pumped from high-rise buildings with low water cement ratio and low viscosity is an urgent problem that needs to be solved.
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