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플라이애시와 고로슬래그 미분말을 사용한 지오폴리머 콘크리트 보도블록의 성능평가
하기주 ( Ha Gee-joo ),이동렬 ( Yi Dong-ryul ),하재훈 ( Ha Jae-hoon ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
In this study, it was developed geopolymer concrete of alkali-activated using the mixed fly ash and blast furnace slag. and it was developed the interlocking block using the developed geopolymer concrete. In addition, the bending strength and water absorption rate of the interlocking block was tested by KS standard. The test results were as follows. The water adsorption ratio of the BSF4 specimen was under 10%, and the flexural strength of that was over 5MPa.
고로슬래그 미분말 및 섬유를 혼입한 내화패널 적용 철근콘크리트 부재의 구조성능 평가
하기주(Ha, Gee-Joo),이동렬(Yi, Dong-Ryul),하영주(Ha, Young-Joo),하재훈(Ha, Jae-Hoon) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
In this study, to prevent the spalling of high strength concrete, the fire resistance panels was constructed using blast furnace slag and fiber. And the structural performance of reinforced concrete members was conducted after a fire test on the fire resistance panels. Ten reinforced concrete members using high strength concrete were constructed and tested under monotonic loading. Experimental programs were carried out to improve and evaluate the structural performance of the test specimens: the load-displacement, the failure mode, and the maximum strength were assessed. As a result of the test, The specimen BSS-F that did not use the fire resistance panel had decreased load-carrying capacity. And the specimen showed the shear failure. However, the specimen with the fire resistance panel showed stable behavior and it has decrease the loss of load-carrying capacity of reinforced concrete members.
하기주(Ha Gee Joo),이동렬(Yi Dong Ryul),하재훈(Ha Jae Hoon),하민수(Ha Min Soo),김효진(Kim Hyo Jin),박성식(Park Seong Sik) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
In this study, it was investigated the state of domestic and foreign demolition engineers for the development of the domestic demolition industry. And it was analyzed the market size and company state in the domestic and foreign demolition industry. We suggested six proposals, such as trainning of demolition engineer, D/B establishment of expert, opening of teaching program, arrangement of teaching system, accomplishment of institution, to devolop the domolition industry.
국내 해체산업 관련법령 현황분석 및 개선방안 - 안전관리를 중심으로 -
하기주 ( Ha Gee-joo ),이동렬 ( Yi Dong-ryul ),하재훈 ( Ha Jae-hoon ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
Generally speaking, the demolition is the subsequent construction activity which has been done after building life-span of twenty two years or so. However, we have not prepared suitable systems and laws and regulations as long-term solutions. We have surveyed and analyzed current laws and regulations on the demolition in Korea, we suggested advanced solutions to demolition industry in Korea based on the major findings of this study.