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Combining with the technology of self-compacting concrete,self-stressing concrete and con-crete-filled steel tube,we can get self-compacting and self-stressing concrete-filled steel tube.In order to study the expansive mechanism of self-stressing concrete,the continuous observation of 47 days on six specimens was carried on.The specimens have different steel area to concrete area ratio.The expansive process in hoop and axial direction were studied,and the expansive mechanism was discussed too.The experimental results identify that the creep and elastic deformation take a large proportion in effective free expansion.The calculating formu-las of self-stress in hoop and axial directions were presented here.
Combining with the technology of self-compacting concrete, self-stressing concrete and con-crete-filled steel tube, we can get self-compacting and self-stressing concrete-filled steel tube. Order to study the expansive mechanism of self-stressing the continuous observation of 47 days on six specimens was carried on. The specimens have different steel area to concrete area ratio. the expansive process in hoop and axial direction were studied, and the expansive mechanism was discussed too. the experimental results identify that the creep and elastic deformation take a large proportion in effective free expansion. The calculating formu-las of self-stress in hoop and axial directions were presented here.