Construction Ⅱ

[1198] CASE STUDY FOR PUMPING 80 MPa GRADE CONCRETE TO 260 M HEIGHT (CORE CONSTRUCTION OF A HIGH RISING BUILDING IN KOREA)

Dongyeop HAN¹, Min-Cheol HAN², Gyu-Dong KIM³ (1.Cheongju University, Research Institute of Industrial Sciences 2.Cheongju University, Department of Architectural Engineering 3.Lotte Engineering and Construction, Lotte World Tower site)

Keywords:concrete pumping, high performance concrete, high-retention type polycarboxylate-based superplasticizer

The aim of this study is to evaluate and analyze the influence of pumping on property changes of concrete. The high-performance concrete with 80 MPa made up of various materials including a high retention type polycarboxylate-based superplasticizer was fabricated and placed to the 260 m height. Test results indicated that different changes in concrete properties were evaluated depending on the pumping height. Based on a rheological analysis, plastic viscosity was significantly decreased, and yield stress was slightly decreased.