운반, 펌프압송이 콘크리트 품질에 미치는 영향에 관한 실험 연구 ( The influence of transportation and pumping on the properties of concrete )

New teniques on the construction method and rapid progress on the manufacturing process of concrete are due to the demands for the mass construction in short period. Especially, the surprising changes are being made by ready-mixed concrete and pumpcrete. But, in spite of the deterioration of concrete quality made by more incresed transportation time and more higher pumping pressure, only few studies were conducted on the effects of transportation time on consistency. Re-examination and improvement of current specification on the concrete transportation system is in need to improve not the quality of concrete structure but the workability of fresh concrete. The purpose of this study is to provide informations for the guidelines of quality control in concrete construction and analyze the effects of transportation and pumping on the quality of concrete.