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탄소섬유 강화플라스틱 박판과 콘크리트 사이의 계면 부착응력에 대한 유한요소해석
이전호(Lee Jeon-Ho),전철배(Jeon Cheol-Bae),반병열(Bahn Byong-Youl) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
This study investigates the interfacial failure mechanism between CFRP laminate and concrete through the finite element analysis. Based on both the previous experimental studies and the predicting model, finite element analysis was performed to evaluate interfacial behavior between CFRP laminate and concrete. Various interfacial bond stress-slip models and shear modulus of adhesive layer were considered in the present finite element analysis model. The CFRP strain distribution along the bond length and the distribution of interfacial shear bond stress as increasing the load were analyzed. The comparison between the results of finite element analysis and the experiment show good agreement.
이전호 ( Lee Jeon-ho ),이창우 ( Lee Chang-woo ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
With the prolonged Covid-19 epidemic, movement restrictions such as social distancing are prolonged, and as people stay indoors for a longer time, interest in indoor air pollution is increasing. Indoor air quality is not easily purified unlike outdoors. Among indoor building materials, paints and flooring contain formaldehyde that causes sick house syndrome and VOCs that contain carcinogenicity and harmfulness. For modern people who spend a lot of time living indoors for more than an hour, the occurrence of these harmful substances can be said to be fatal. In response to these risks, in July 2019, the government reinforced the standards for indoor air quality to protect the public's health by raising the detection standards for fine dust, ultrafine dust, and formaldehyde in indoor multi-use facilities. People use machines such as air purifiers to improve indoor air quality, or make efforts such as periodic ventilation. In order to reduce or support these other ancillary efforts more effectively, to reduce the generation of pollutants in the building itself, or to adsorb or purify pollutants in the air, use carbon black as an admixture to make a cement hardened body, and to grasp basic physical properties and adsorption capacity. And the result is as follows. As a result of the experiment to determine the appropriate amount of carbon black, it was confirmed that the more the amount of carbon black was added, the better it was in the formaldehyde emission test, but the tendency was not clear when measuring the flexural strength, so a further experiment to improve this is needed.
겔라이트를 혼입한 분말형 폴리머 시멘트 경화체의 흡착성능 평가
이전호 ( Lee Jeon-ho ),이창우 ( Lee Chang-woo ),황우준 ( Hwang Woo-jun ),이상수 ( Lee Sang-soo ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In order to solve problems such as acceleration of resource use and environmental pollution, experiments were conducted with the aim of producing indoor finishing materials that can adsorb fine dust and carbon dioxide using gelite and polymer, which are porous materials. Based on the previous experiment, gelite was substituted at each level in a matrix having a polymer S738P substitution rate of 12.5%, and the results are as follows. As the substitution rate of gelite increased, the amount of fine dust and carbon dioxide adsorption increased, which is believed to be due to physical adsorption due to the high porosity of gelite. However, further experiments are needed as the overall adsorption amount is not high due to the filling inside the matrix due to the polymer.