Capital Airport Terminal 3 Project (Clear Water Concrete)

(1) Technical requirements: Fresh concrete with good workability and a slump of 180mm when discharged from the machine; The slump loss within 1 hour is less than 20mm; Easy to vibrate, smooth surface and uniform color after demoulding.

(2) Engineering difficulty: As it is an Olympic supporting project, high requirements are placed on the appearance of hardened concrete. Not only must the color be uniform, but also very few bubbles must be present. It is strictly prohibited for fresh concrete to have bleeding or segregation.

. The construction method combines tower crane operation with pumping, resulting in slow pouring speed and significant loss of slump.

(3) Pouring result: slump of 180mm appeared; 1-hour slump of 180mm; Easy to vibrate. At present, about 30000 cubic meters of clear water concrete have been poured, including clear water columns and clear water box beams. After demoulding, the appearance of the concrete is smooth, the color is uniform, and there are very few bubbles. The stability of product performance has been unanimously recognized by concrete suppliers and construction units.