Mechanical properties of high-strength, low-heat and micro-expansion concrete-filled steel tube

The self-stress is one of the important mechanical performances of high-Strength, low-heat and micro-expansion concrete-filled steel tube (CFST). In this paper, the self-stress trial of the fifteen high-strength, low-heat and micro-expansion CFST is introduced. And the generating and distributing features of pre-stress and its relation to adding quantity of expansive agent were investigated, which provides persuasive dependences for optimal design of high-strength, low-heat and micro-expansion CFST, especially for the design of added quantity of expansive agent.