The Investigation and Application of Self-compacting Expensive Concrete Filled Steel Tube

In order to meet the construction requirements of Long-tan River arch bridge, we prepared the self-compacting expensive C50 concrete that possesses good workability, high strength, high early strength and expansive properties. The self-strains of steel tube caused by the core concrete expansion and the maximum load bearing capacity of steel tube filled with self-compacting exponsive concrete were all studied. The experimental results show that the core concrete is under three-dimensional suppressed, and the bearing capacity of steet tube filled with expansive concre is about 7% more than that of common concrete filled steel tube. The construction application effect was good.