역타설기둥 타설이음 부분의 공극성상에 관한 연구

A Study on Void Examination in Top-Down Column Joint

When top down method is used, it could be a construction method trouble in column joint, between the former concrete and the latter. It could bring a void and weak concrete in column. The purpose of this study is finding a way to prevent concrete void and concrete suitable for top down, through V-metering for top down column and concrete experiment.