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버블시트에 메쉬타포린을 보강한 한중 콘크리트용 개량형 양생막의 내풍성능에 관한 Mock-Up 실험
최현규(Choi, Hyun-Kyu),손명식(Son, Myung-Sik),한천구(Han, Cheon-Goo) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.11
In this paper, the insulating technique, named a double bubble sheet (for early frost protection of cold weather concrete), developed in previous work is modified to improve wind resistance. The modified technique (MT+BBS1:meshtarpaulin+single bubble sheet) had higher tensile strength and better insulating performance as compared with the previously developed technique. To examine the effectiveness of MT+BBS1, conventional techniques, named T1 and T2, were prepared to compare the results of a wind resistance test. In Series Ⅰ, a number of zipper bags containing sand were prepared to simulate the wind resistance test by converting the wind speed to the uniform load. In Series Ⅱ, the actual wind resistance tests with the wind speed of 5㎧, 10㎧ and 15㎧ were examined. Analysis revealed that MT+BBS1 had higher wind resistance and lower deformation than T1 and T2, and it was found that the predicted results obtained from Series Ⅰ was very similar to the actual test results obtained from Series Ⅱ. Therefore, it can be said that the experimental method using uniformly distributed zipper bags is convenient to simulate the wind resistance test and at the same time, precise.
최현규(Choi, Hyun Kyu),박경택(Park, Kyung Taek),한민철(Han, Min Cheol),김성수(Kim, Seong Soo),한천구(Han, Cheon Goo) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
In this paper, tests are carried out to clarify the effect of elevated temperature on microstructure of high strength concrete. According to results, An increase in temperature led to decrease of strength above 400℃. And at the 800℃, the amount of the void is increased and organization is destroyed by high temperature.