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이혁주 ( Lee Hyuk-ju ),한준희 ( Han Jun-hui ),이재진 ( Lee Jae-jin ),한동엽 ( Han Dong-yeop ),한인덕 ( Han In-duck ),한민철 ( Han Min-choel ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
There are three types of high fluidity concrete: powder based, VMA based, and combined. In the case of the powder based high fluidity concrete mixture, according to the textbook, increased viscosity due to the replaced fly ash can prevent segregation of coarse aggregate. On the other hand, decreased density of the powder due to the fly ash replacement can causes segregation but there is no report on this issue. Therefore, in this research, the segregation resistance and segregation evaluation method for powder based high fluid concrete mixture are evaluated. As a result, with increased replacing ration of supplementary materials, EIS value was decreased and apparently segregation resistance was increased. However, from the compressive strength evaluation depending on height of the cylindrical specimen, it was confirmed that the different of strength difference between top and bottom part of the specimen. Thus, following research regarding vertical segregation should be studied.
CGS 잔골재를 사용한 콘크리트의 응결시간 추정시 듀로미터 사용 가능성 분석
이혁주 ( Lee Hyuk-ju ),한준희 ( Han Jun-hui ),백승복 ( Baek Seung-bok ),신용섭 ( Shin Yong-sub ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
In this study, we compared the proctor penetration resistance test value of the concrete using CGS for Fine Aggregate and the hardness value of the Durometer. The results are summarized as follows. 1) Surface finish The Durometer C type setting time measurement value was about 45 HD, and the hardness value of the Durometer D type was about 5 HD. 2) The proctor penetration resistance test value and the hardness value of the Durometer are highly correlated and are expected to be easy to use.
CGS를 잔골재로 활용하는 콘크리트의 응결시간 추정시 고무경도계 A타입 사용 가능성 분석
이혁주 ( Lee Hyuk-ju ),한준희 ( Han Jun-hui ),백승복 ( Baek Seung-bok ),신용섭 ( Shin Yong-sub ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2
In this research, Proctor insertion resistance test values and Durometer A type hardness values were compared and analyzed between the setting times of the concrete using CGS for Fine Aggregate, and the results are summarized as follows. 1) The Proctor penetration resistance test value and the hardness value of Durometer A type showed a high correlation in the form of a curve. 2) About surface finish The resolution exceeding the hardness value of the Durometer A type uses about 25 HD, and in the case of termination, about 35 HD, and is considered to be effective for determining the surface finishing work time. The possibility to do is expected.
20℃ 조건에서 초지연제 혼입율 변화에 따른 응결지연 성능 변화 분석
임군수 ( Lim Gun-su ),한수환 ( Han Soo-hwan ),현승용 ( Hyun Seung-yong ),김종 ( Kim Jong ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
This research is part of the research for unifying the mass concrete and utilizing the rate of super retarding agent. We analyzed the performance of super retarding agent 20℃ conditions. It was found that there was no deterioration in fluidity and air quality due to the change in the super retarding agent mixing rate. It was found that when super retarding agent was mixed up to 0.5 %, it was delayed for 22.3 hours at 20℃. Therefore in order to ensure the performance required at the site, the super retarding agent mixing rate must be determined by fully considering the situation at the site. In addition it will be analyzed that super retarding agent performance analysis at high temperature will be required in subsequent studies.
현장용 응결시간추정계를 이용한 고염화물 모르타르의 응결시간 추정
이혁주 ( Lee Hyuk-ju ),한준희 ( Han Jun-hui ),현승용 ( Hyun Seong Yong ),신용섭 ( Shin Yong-seop ),이준석 ( Lee Jun-seok ),한민철 ( Han Min-choel ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
In the previous study, durometer, namely rubber hardness tester Was used to confirm the possibility of using the setting time of concrete for determination. in this study, the possibility of using condensation time judgment condensation estimation system by comparing the measuring station setting estimation system Measuring needle of the proctor penetration resistance tester by newly making a measurement needle and refining the coagulation estimation system Want to make sure. As a result of this study, it was possible to use one condensation estimation system showing similar correlation between the two types of durometer showing high correlation with the penetration resistance value of proctor testers, It is considered to be fruitful to use the dew condensation estimation system for determining the setting time.
양생온도 변화에 따른 초지연제의 응결지연 성능 변화 분석
현승용 ( Hyun Seung-yong ),임군수 ( Lim Gun-su ),한수환 ( Han Soo-hwan ),김종 ( Kim Jong ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
This research is part of the research for unifying the mass concrete and utilizing the rate of super retarding agent. We analyzed the performance of super retarding agent under low temperature conditions. It was found that there was no deterioration in fluidity and air quality due to the change in the super retarding agent mixing rate. It was found that when super retarding agent was mixed up to 0.5 %, it was delayed for 22.3 hours at 20℃, 48.2 hours at 10℃, and 48.5 hours at 5℃. Therefore in order to ensure the performance required at the site, the super retarding agent mixing rate must be determined by fully considering the situation at the site. In addition it will be analyzed that super retarding agent performance analysis at high temperature will be required in subsequent studies.
양생온도 및 초지연제 혼입율 변화에 따른 응결지연 성능
현승용 ( Hyun Seung-yong ),임군수 ( Lim Gun-su ),김종 ( Kim Jong ),한민철 ( Han Min-choel ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.2
본 연구에서는 응결시간 지연용 초지연제를 사용한 콘크리트의 성능 확보 방안을 고찰하기 위한 연구로서 건설공사 현장에서 영향을 받을 수 있는 양생온도 변화에 따른 초지연제 콘크리트의 응결성능을 분석하였다. 초지연제를 0.5 %까지 혼입할 경우 20℃에서는 22.3시간, 35℃에서는 8.7시간 지연되는 것으로 나타나 양생온도가 높아짐에 따라 응결지연성능이 감소하는 것으로 나타났다.
고강도 분체계 고유동 콘크리트의 J-Ring을 이용한 재료분리 판정 분석
이혁주 ( Lee Hyuk-ju ),이영준 ( Lee Young-jun ),현승용 ( Hyun Seong-yong ),한동엽 ( Han Dong-yeop ),한인덕 ( Han In-duck ),한민철 ( Han Min-choel ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
In this study, the current tendency to replace a large amount of material admixture, which is fly ash (FA) and blast furnace slag (BS), into concrete is that high-grade cheese high admixture of high fluidity concrete In consideration of the substitution rate, we considered J-Ring to investigate the influence on the segregation resistance and the method of evaluating the classical segregation. In addition to the admixture replacement rate in the study results, the EIS using J-Ring became lower and the percentage of vehicles with segregation increased. Such a tendency is considered to be positive when J-Ring is used when segregation is judged if segregation degree is similar to EIS using J-Ring.
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.