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Image analysis를 통한 다공성 시멘트 모르타르 복합체 내 공극량 산출
손다솜 ( Son Dasom ),이종구 ( Chong Ku Yi ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.1
This study was conducted to derive quantitative air void volume calculation techniques in various complexes with porosity. Calculation of voids in a complex is an essential factor in improving mechanical properties, and quantitative measurement techniques are needed because the environment is not constant to apply the currently used ASTM criteria. Using the analysis technique obtained through 2D image analysis, it is believed that meaningful results can be derived through Micro CT analysis results and cross-check later.
남세균 혼입 생체 건축 자재 생산을 위한 무시멘트 젤라틴 블록 실험적 연구
박지윤(Park, Ji Yoon),이종구(Yi, Chong Ku) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 남세균 혼입 무시멘트 생체 건축 자재 생산을 위한 기초적인 실험으로, ISO Sand와 바인더로써 젤라틴 용액이 사용되었으며, 5 t 및 7.5 t의 하중으로 압착하여 50mm X 50mm X 15mm 무시멘트 모래 블록을 제작하였다. 실험 결과, 7.5 t 하중으로 제작한 모래 블록의 강도가 5 t 블록보다 20% 더 높은 강도를 보였다. This research is an experimental research on development of living building material without cement. The sand blocks were produced by applying 5 and 7.5 ton each. As a result, the sand block made by 7.5 ton was 20% stronger than that of 5 ton.
김범휘 ( Kim Beom-hwi ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
The use of high-strength grout for facility foundations and bridges has recently been expanding in offshore wind farms. Offshore wind farms require a bearing capacity for horizontal loads such as wind, waves. Therefore, in this study, the strength of the high-strength grout discharged through pump pressure was measured and compared with the existing strength to secure the strength after the underwater pump pressure of the high-strength grout used in the offshore wind connection. The compressive strength measurement showed that the strength difference at each position of the core specimen was 1% higher than that of the other specimens, and there was almost no change in the strength according to the height. The strength of the core specimen decreased by 23% compared to the existing strength, which is similar to the result of this study because the strength of the core specimen decreased by approximately 25% compared to the general specimen according to related research. Therefore, it is believed that there is no decrease in strength due to underwater pumping.
Micro-CT 활용 콘크리트 내 철근 早식 정량을 위한 실험적 연구
장인동 ( Jang In-dong ),이종구 ( Yi Chong-ku ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Corrosion of rebars in reinforced concrete structures is a major factor that shortens the life of the structure. As corrosion progresses, the adhesion between the concrete tissues and the rebar decreases and the cracks in the concrete due to the expansion of the oxide intensify. Although it is necessary to measure corrosion behavior of rebars inside the concrete to measure degradation of structures due to rebar corrosion, no studies have been conducted to measure corrosion of rebars in In-situ state. In this study, corrosion of rebars in reinforced concrete specimens was attempted to be quantified using micro-computer tomography. Since corrosion of concrete takes several months per 10mm of cover, accelerated corrosion techniques were applied. Accelerated corrosion on the specimen was conducted by applying a 10 V magnetic field to the buried rebar and external electrodes with the specimen submerged in a 10% calcium chloride solution. The experiment found that within two weeks, more than 40% of rebar reduction occurred, and the cracks in the radial cracks occurred through the concrete structure, leading to the transfer of the oxide produced through the cracks to the surface of the specimen.
최희복,김백중,강경인,이종구,Choi, Hee-Bok,Kim, Beak-Joong,Kang, Kyung-In,Yi, Chong-Ku 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
Many researchers have reported strength reduction of concrete when recycled aggregate is introduced to the mix. However, the causes of such reduction and preventive measures are yet to be established. In this study, effect of recycled aggregate on concrete is investigated by microscopic examinations of micro-cracks present in the recycled aggregate (RG) and by measuring moisture absorption rate of RG. The results showed the followings: 1) the shape and extent of micro-cracks vary by type and size of RG, 2) recycled aggregate concrete (RAC) containing RG formed the failure surface along the micro-cracks inside RG, 3) moisture uptake, which may alter local water content in wet concrete, mostly took place via micro-cracks of RG reaching depth of about 3 mm within the first 1 hr, much faster rate than that of natural aggregate of the same type. Based on the results of this study, it is recommended that the size of RG be kept less than 10 mm for production of high quality RG with a small amount of micro-cracks.