施工Ⅱ

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

座長(土木)：浦野真次
座長(建築)：笠井浩
講演者：韓東燁¹, 韓敏喆², 金奎東³ (1.Cheongju University, Research Institute of Industrial Sciences 2.Cheongju University, Department of Architectural Engineering 3.Lotte Engineering and Construction, Lotte World Tower site)

キーワード：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.