Research on the Performance Control and Application of Self-compacting Micro-expansive Concrete for Steel Tube Tower
The effects of silica fume content,water-binder ratio and sand ratio on the workability and mechanical properties of core concrete were studied,and the effects of expansive agent content on the volume deformation of core concrete were analyzed.The results show that the increase of silica fume content is helpful to improve the strength of concrete,and the viscosity of concrete can be reduced when its content is less than 40 kg/m3.The increase of cement content can increase the strength of concrete,but when the cement content exceeds 510 kg/m3,the workability of concrete decreases.The optimum sand ratio to meet the working performance requirements of concrete is 44％.The dosage of 40 kg/m3 expansive agent can meet the requirements of volume stability of concrete.The concrete construction mixture ratio determined according to the experimental research has been successfully ap-plied to the core concrete in the steel tube of the main tower of Kahaluo Jinsha River Bridge.The site concrete condition and pouring effect are good,and there is no void phenomenon.
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