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장기폭로실험에 의한 철근콘크리트 보수재료공법 시스템의 열화특성 평가에 관한 연구
최형길 ( Hyeong-gil Choi ),신관수 ( Kwan-soo Shin ),신승봉 ( Seung-bong Shin ),나철성 ( Chul-sung Na ),김규용 ( Gyu-yong Kim ),김무한 ( Moo-han Kim ) 한국건축시공학회 2007 한국건축시공학회 학술발표대회 논문집 Vol.7 No.1
In this study, for the establishment of the performance evaluation methods of repair material and method for reinforced concrete structure and the quality control standards of durability recovery method, the quantitative exposure data by exposure experiment under the coastal and normal atmosphere environment is accumulated and analyzed. Investigating and evaluating the result of exposure experiment during 54 months of exposure age under the coastal and normal atmosphere environment, Micro crack, swelling and spalling of surface coating material, crack of repair boundary parts and the great potential difference between repair part and non-repair part were somewhat generated. And the result shown that exposure specimen of coastal environment had lower electrode potential than exposure specimen of normal atmosphere environment.
콘크리트 초기 수축균열특성 평가를 위한 판상-링형 구속시험방법의 성능평가에 관한 연구
최형길 ( Choi Hyeong-gil ),라훌 ( Rahul Didolkar ),이의배 ( Lee Eui-bae ),남정수 ( Nam Jeong-soo ),김규용 ( Kim Gyu-yong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
In Concrete shrinkages occur like plastic shrinkage and drying shrinkage in the early age of the concrete by evaporation and transfer of moisture. Within the country, the crack test standardized by KS is used to test the drying shrinkage of the concrete by using the restricted drying shrinkage of Dumbbell type mold, but this test is for the cracking-point and the restricted shrinkage stress. Thus it is difficult to valuate the crack quantitative test. In this study, it is intended to develop the Flat-ring type restrained test method. And the shrinkage transformation conduct of the concrete, to provide the basic data for the valuating method of national concrete shrinkage cracking feature, and to verify the pertinence of the Flat-ring type restrained test method by comparing and valuating in accordance with the other concrete shrinkage cracking valuation method internally and externally.