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한인덕 ( In-deok Han ),정명주 ( Myung-joo Jeong ),장명훈 ( Myunghoun Jang ) 조선대학교 공학기술연구원 2021 공학기술논문지 Vol.14 No.4
Urban concentration of the population is causing a decrease in the population of underdeveloped areas, and the number of closed schools in rural areas is also increasing because of a decrease in the number of students. Efforts to use closed schools as cultural facilities are being made, but they are still insufficient. Since the same problems also occur in Jeju, we would like to investigate the current status, identify problems, and propose more efficient and active utilization plans based on cases of closed schools currently in use. As a result of understanding the use status of existing closed elementary schools, we determined that welfare facilities for the elderly and club centers can be alternative uses for closed schools. Welfare facilities for the elderly provide education, healing, rest, and jobs for the silver generation. The club center is a space where people with the same hobby can gather and help each other.
잔골재의 미립분 보충재로 순환골재 미분말을 활용하는 모르타르의 기초적 특성
한인덕 ( In-deok Han ),장명훈 ( Myunghoun Jang ) 조선대학교 공학기술연구원 2020 공학기술논문지 Vol.13 No.4
In order to improve the performance of cement mortar using combined sand of crushed and sea sands, this study analyzed its fundamental properties in accordance with replacement by recycled aggregate powder. The results showed that for binary aggregate with crushed and sea sands in a 6 to 4 ratio, the standard gradation was satisfied with replacement by less than 7.5% of recycled aggregate powder. Furthermore, as the replacement ratio of the recycled aggregate powder was increased, fluidity decreased and air content increased. Meanwhile, with replacement of less than 10% by the recycled aggregate powder, compressive strength increased 10 to 20% under the conditions of this research. Overall, it was determined that by replacement of 2.5% of recycled aggregate powder in binary aggregate with crushed and sea sand with poor gradation, optimum results could be obtained for satisfying the standard gradation and improving the fundamental properties of the cement mortar. It is necessary to evaluate the possibility of applying this result to concrete and actual structures.
CGS를 잔골재로 활용하는 FA치환 콘크리트의 응결시간 추정시 개량형 듀로미터 사용 가능성 분석
이혁주 ( Lee Hyuk-ju ),신용섭 ( Shin Yong-sub ),서항구 ( Seo Hang-goo ),한인덕 ( Han In-deok ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
In this study, the Proctor penetration resistance test value and the hardness value of the improved Durometer were compared and analyzed for the change in the FA replacement rate of the concrete using CGS fine aggregate. The results are summarized as follows. It is. 1) The Proctor penetration resistance test value and the hardness value of the improved Durometer showed a high correlation in the form of a curve. 2) About surface finish Super-resolution with the improved Durometer is considered to be useful when using about 50 HD and about 80 HD in the end to determine the surface finishing work time.
광물질 혼화재의 치환율 변화가 고유동 콘크리트의 특성에 미치는 영향
한인덕(Han, In-Deok) 대한건축학회 2019 大韓建築學會論文集 : 構造系 Vol.35 No.12
본 연구는 물결합재비 40 %인 일반강도 영역에서 FA, BS 및 FA+BS인 광물질 혼화재의 0~30 %의 치환율 변화가 분체계 고유동 콘크리트의 재료분리 저항성 등 제반 특성에 미치는 영향에 대하여 분석하였다. 특히 고유동 콘크리트에서 밀도가 작은 분체의 치환율을 증가시킬 경우 액상 콘크리트의 점성저하로 재료분리가 증대될 수 있지 않은지, 또한 J-ring시험으로 철근 장애부에 의한 재료분리 정도에는 영향을 미치지 않을지 등 제반특성을 검토분석하였다. 실험연구 결과 Normal 시험의 경우는 기존의 이론과 같이 광물질 혼화재의 치환율이 증가할수록 레올로지적 측면의 점성증가로 재료분리가 방지되었다. 단, J-ring를 이용한 시험의 경우는 액상중 밀도저하로 양호하게 골재를 끌고 철근사이를 통과하지 못해 재료분리 방지에 큰 역할을 하지 못함을 알 수 있었다. The aim of the research is to evaluate the influence of various replacing ratios of supplementary cementitious materials(SCMs) such as fly ash(FA), blast furnace slag(BS), and both FA and BS on general properties including segregation resistance as a powder based high fluidity concrete of normal strength grade with water-to-cement ratio 0.40. Specifically, by replacing the SCMs with low density powders, it was assessed that the decreased segregation resistance due to the decreased viscosity by J-ring test. As a result of the experiment, from the general test, the mixtures with SCMs showed increased segregation resistance by increased viscosity as the references, while some segregation was shown from J-ring test due to the decreased density of fresh state mixture related with the capacity of delivering coarse aggregate.
광물질 혼화재 치환이 고유동 콘크리트의 재료분리 저항성에 미치는 영향
이혁주 ( Lee Hyuk-ju ),이영준 ( Lee Young-jun ),현승용 ( Hyun Seung-yong ),한인덕 ( Han In-deok ),한동엽 ( Han Dong-yeop ),한민철 ( Han Min-cheol ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
In this study, we considered the influence on segregation resistance at the time of substitution of FA and BS, which are substance admixtures of high fluidity concrete. According to the research results, EIS, which is an index of segregation in high fluidity concrete replacement, showed a low value, and the composition also showed a higher value than OPC. Therefore, it is confirmed that the resistance to segregation at the time of admixture replacement of high fluidity concrete is improved.
한인덕,김두성,장명훈,Han, In-Deok,Kim, Doo-Seong,Jang, Myunghoun 한국건축시공학회 2023 한국건축시공학회지 Vol.23 No.4
Buildings that have been long neglected can suffer severe durability reduction due to factors such as rebar rust and concrete quality deterioration resulting from exposure to outside air. Furthermore, the issues associated with these suspended buildings, including safety accidents, social crimes, and environmental pollution, are becoming increasingly serious. This study investigates the current status of these buildings in the Jeju area, identifies the problems, and examines the durability of the structure in a specific location to assess the possibility of future use. Aesthetic surveys(visual and slope inspections) as well as non-destructive tests(compressive strength tests, neutralization tests, and rebar detection tests) were conducted to assess durability. The analysis revealed that the structure maintained satisfactory durability and the building's condition was good in comparison to the years of neglect.
Hydrometer법을 이용한 고로슬래그 시멘트의 분말도 신속 품질 평가 가능성 분석
이재진 ( Lee Jae-jin ),김민상 ( Kim Min-sang ),문병룡 ( Moon Byeong-yong ),한인덕 ( Han In-deok ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
Recently in the construction industry there has been an increasing use of increasing replacement of cement with blast furnace slag cement(BS), an industrial by-product, to reduce environment load and production costs, and other increasing uses of BS cement. However in the case of BS being delivered in RMC factories, only score reports submitted when the are delivered are relied upon and ways to test the quality of fineness is inadequate. Therefore this study gave many changes to various cements and BS fineness to test the variations of BS as a cement, then used the correlation between this and the density value in the Hydrometer method to test the possibility for rapid appraisal of quality fineness of BS cement. Results showed that if the one fifth graph of the density and fineness correlation were to be used, a rapid appraisal of BS cement fineness quality would be possible.
한천구(Han, Cheon-Goo),한인덕(Han, In-Deok) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.7
Since the currently used segregation evaluation method is quantitative method based on the experience of operator, it has had many difficulties to adopt for practice. In this research, as a solution of this problem, new workability performance evaluation method was suggested using the performance levels based on the evaluation index of segregation for normal concrete (EISN) quantified by the maximum-to-minimum ratio of the flow of slumped concrete by the slump test. As the results of the experiment, when the range of the slump value was 150 to 230 mm, (slump flow value was 300 to 450 mm)the evaluation method was valid. Namely, as a base of 1.09 EISN, lower and higher ranges were determined as a “good” and “segregation”, respectively, and further performance leveling was suggested with 1.06 ? 1.09 for III level, 1.03 ? 1.06 for II level, and1.00 ? 1.03 for I level within the “good” range. Within the good conditions of concrete, the categorized performance levels were suggested with level I, II, and III for 1.00 - 1.03, 1.03 - 1.06, and 1.06 - 1.09, respectively.
잔골재율 및 단위수량 변화에 따른 고강도 콘크리트의 품질특성
한천구(Han, Cheon-Goo),한인덕(Han, In-Deok) 대한건축학회 2015 大韓建築學會論文集 : 構造系 Vol.31 No.9
Although water-to-cement ratio is the main factor of determining the compressive strength of the concrete, sand-to-aggregate ratio, and unit water content dominate segregation resistance and target slump of the concrete, respectively. Therefore, in this research, to suggest a fundamental data on sand-to-aggregate ratio and unit water content for mix design of high strength concrete, fundamental properties of the high strength concrete of 30 % water-to-cement ratio were evaluated depending on the various sand-to-aggregate ratio and unit water content. As a result of the experiment, for fresh state concrete properties, as the sand-to-aggregate ratio was increased, slump, slump flow, and air content were decreased, and as the unit water content was increased, slump, slump flow, and air content were increased. Based on the 180 mm of slump, each slump and slump flow measurements deduced favorable performances at lower and higher than this value, respectively. In segregation aspect, about 45 % of sand-to-aggregate ratio was good and under this conditions, it was good to control the superplasticizer dosage and unit water content. Furthermore, to achieve better compressive strength, under the 45 or 50 % of sand to aggregate ratio, low unit water content of 165 kg/m<SUP>3</SUP> showedmaximumvalueofcompressivestrength.