| As one of the important steel-concrete combination structures ,steel tube concrete has been rapidly generalized and used in big foundations,tall architectures and big span arch bridges,and its limitations have been gradually emerged,especially the disengaging between steel and concrete.Taking the first step in practical engineering problems,the author made a study of the high performance expansion steel tube concrete's mixture ratio design and deformation property, in order to solve the disengaging between steel and concrete. Main works are : design mixture ratio of HPC fit for steel tube concrete;analyse different expansive agent types and amounts HPC's deformation rules;study HPEC contain different amounts fly ash's deformation characters;quest for the long-term rules of deformation of concrete which contain different amounts of double mixing ZY and MgO expansive agent.We can approve some fundamental conclusions from the study results:1.The total deformation of concrete minishs along with the increase of ZY's amounts,and some ZY's addition can prevent the disengaging between steel and concrete.2.The total deformation of concrete firstly minishs and then goes up along with the increase of MgO's amounts.When the ratio is around of 4%,its total deformation is the least and can bestly prevent the disengaging between steel and concrete.3.The total deformation rule of concrete with double mixing ZY and MgO expansive agent is the same as MgO's.When the ratio is around of 8%,its total deformation is the least and can bestly prevent the disengaging between steel and concrete.4.HPEC's total deformation increase along with the increase of fly ash's amounts, and acceding fly ash to HPEC produces an adverse effect on preventing the disengaging between steel and concrete.5. When the single mixing of MgO reaches the ratio around of 4% ,the concrete's total deformation is the least and can bestly prevent the disengaging between steel and concrete.
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