| Title |
A Study on the 1:1 Full Scale Core Wall Mock-up Test of High Strength Concrete Performed by Testing Pumpability |
| Authors |
Ko Joo-Hwan ; Moon Hyung-Jae ; Seok Won-Kyun ; Park Soon-Jeon ; Kim Hwa-Jung |
| Keywords |
Super High Pressure Pump ; High Strength Concrete ; Pumpability ; Mock-up |
| Abstract |
According to the concentration of concerns about super tall builiding, various technologies for constructing super tall building are using nowadays. For constructing super tall building, maintenance properties of remicon slump flow considered a traffic jam and a delivery time of high strength concrete for direct pressure mix until 500m height must be required. And, super tall building above 100 floors is required that each floor's height is more than 4 meters, and each core wall's thickness is more than 60cm. So, this study is the fundamental technology of direct pumping for high strength concrete to the targeted height during the construction and the full scale mock-up test for the successive accomplishment of super tall building, Test results are as follows; In the result of pumpability test, as pipe friction factor became higher, flow resistance was increased and delivery output was reduced. Before concrete pumping, the aimed fresh concrete properties of high flowable concrete were well satisfied. After concrete pumping, slump flow loss occurred in the case of 70MPa, and compressive strengths were higher than design strength. And, in the result of full scale mock-up test results, real strength of core wall was satisfied with design strength at 28 days regardless of types of strength, and lower part's strength was a little higher than upper part's strength. Lateral force was evaluated with max. 4.5t/m2, and hydration temperature of test was evaluated that maximum heat of central part revealed about 80℃ at 70MPa and 65℃ at 50MPa, and, the difference between inner and outer part revealed about 30℃ at 70MPa and 12℃ at 50MPa. Also, no by hydration temperature was not shown on the surface. |