Properties of High Strength Concrete before and after Pumping in Response to Strength Level and Pumping Height

초고층 건축물에서 고강도 콘크리트의 강도 및 압송높이 변화에 따른 펌프 압송 전·후의 물성평가

As the increase amount of high rise building, equipments for high rise building have been extensively studied. However quality problems caused as the pumping of concrete including loss of flowalility, air content and increasing of the temperature. In this study, fundamental performances of the 80 MPa concrete before·after pumping has been tested. Results showed slump flow increased after pumping temperature of concrete also increased after pumping. Results also shown air content all satisfied the target range and compressive strength of concrete increased about 20 % after pumping, All the performances satisfied the standard for 80 MPa.