Method for batch casting high-fluidity high-performance concrete and low-fluidity high-performance concrete

A method of batch-casting high-fluidity high performance concrete and low-fluidity high performance concrete, the method comprising:

• a) installing a formwork and reinforcing bars for a first concrete member (110) on which high-fluidity high performance concrete (120) is to be cast;
• b) installing a formwork and reinforcing bars for a second concrete member (130) on which low-fluidity high performance concrete (140) is to be cast along a slope gradient;
• c) mixing binder, mixing water, fine aggregate, coarse aggregate, and superplasticizer into the low-fluidity high performance concrete (140);
• d) before casting of the concrete, forming the high-fluidity high performance concrete (120) with adjusted fluidity by using a thickener while a mixing volume of the superplasticizer is maintained the same;
• e) adding an additional chemical agent to the high-fluidity high performance concrete (120);
• and
• f) batch-casting the low-fluidity high performance concrete (140) and the high-fluidity high performance concrete (120) on respective formworks,
• wherein the thickener is used in an amount in a range of 0.005 to 5.0 wt % with respect to cement weight, the additional chemical agent is used in an amount in a range of 0.001 to 0.05 wt % with respect to the cement weight, and the low-fluidity high performance concrete (140) is cast so that a fluidity maintaining time and a hydration reaction time are the same as those of the high-fluidity high performance concrete (120).