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산업부산물을 다량활용한 저시멘트 모르타르의 역학적·전기적 특성
김영민 ( Kim Young-min ),임건우 ( Im Geon-woo ),임창민 ( Lim Chang-min ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
This study evaluated the mechanical and electrical properties of low-cement mortar using a large amount of industrial by-products to reduce carbon emissions from the cement industry. As types of industrial by-products, blast furnace slag and fly ash, which are representative materials, were used, and ultra-high fly ash was mixed and evaluated to solve the problem of initial strength loss. In addition, in order to evaluate the electrical properties, 1% of MWCNT was incorporated relative to the powder mass. As experimental items, the compressive strength was measured on the 1st, 3rd, 7th and 28th days of age, and the rate of change in electrical resistance was measured on the 28th day of age. As a result of the experiment, the initial strength of the test specimen mixed with blast furnace slag and fly ash was significantly lower than that of 100% cement, and the specimen mixed with blast furnace slag showed strength equal to that of cement at 28 days of age. As an electrical characteristic, the electrical resistance was reduced when the load was loaded, and this reason is judged to be the effect of improving the conductivity as the connection between CNTs is narrowed by the compressive load.
김영민 ( Kim Young-min ),임창민 ( Lim Chang-min ),권현우,이건철 ( Lee Gun-cheol ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
In recent years, due to the occurrence of traffic accidents caused by black ice in winter, the number of personal injuries is increasing rapidly. Black ice is a phenomenon that occurs like a thin layer of ice on the road surface. Accordingly, many developments of heat-generating concrete are being developed to remove ice by increasing the temperature by supplying constant electricity to places where black ice is likely to occur. These heating elements are being developed by mixing a conductive material represented by carbon nanotubes with concrete. However, research up to now has been focused on efficient temperature rise and derivation of the optimum mixing ratio, and the evaluation of maintaining heat generation performance during continuous repetition is insufficient. Therefore, in this study, a heating test specimen was manufactured and 50V power was repeatedly supplied to evaluate the heating characteristics.
단면증타 방식으로 보강된 압축전단부재의 하중가력시 전기적 특성 평가
김영민 ( Kim Young-min ),임건우 ( Lim Gun-woo ),임창민 ( Lim Chang Min ),이건철 ( Lee Gun-cheol ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
본 연구에서는 자기감지형 보수재로 단면증타된 압축 및 전단부재에 하중을 재하시켜 파괴시까지 전기저항변화특성을 편가하였다. 부재의 단면증타는 외부 10mm두께로 실시하였다. 실험결과 압축부재에서는 하중가력과 동시에 전기저항이 감소하는 경향을 보였으며, 파괴시에 급격한 증가를 나타냈다. 하지만 전단부재에서는 파괴직전까지 전기저항값의 변화가 크게 나타나지 않았으며, 파괴가 발생된 후에 급격한 증가를 보였다. 따라서 부재의 종류에 따른 건전도 평가에는 압축부재가 더 적합할 것으로 판단된다.
김영민 ( Kim Young-min ),임건우 ( Im Geon-woo ),임창민 ( Lim Chang-min ),이건철 ( Lee Gun-cheol ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
Recently, due to the advancement of buildings, finishing methods using stone are increasing. However, finishing methods are not standardized and rely on workers' arbitrary methods. In stone finishing, many building defects occur due to adhesion performance, so the adhesion performance of stones attached with epoxy is important. Therefore, in this study, the adhesion performance of stones attached with epoxy was evaluated by exposing them to various environments. As a result of the experiment, the test specimens exposed to thermal shock showed only 20% of the standard test specimens' adhesion performance, and the test specimens cured at high and low temperatures showed the standard test specimens. It was expressed in 65-80% of the test specimens. Therefore, the adhesion performance of stone using epoxy was found to be vulnerable to repeated harsh environments.
CO₂ 나노버블을 이용한 전기로 슬래그의 촉진 에이징 검토
임창민 ( Lim Chang-min ),임건우 ( Im Geon-woo ),김영민 ( Kim Young-min ),이상형 ( Lee Sang-hyung ),이건철 ( Lee Gun-cheol ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
본 연구에서는 CO<sub>2</sub> 나노버블을 이용한 전기로 슬래그의 촉진 에이징 가능성 여부를 검토하였다. 촉진 에이징 방법으로는 슬래그 골재를 CO를 포함하고 있는 나노버블에 침지하는 방식으로, 24시간 시료를 침지후 질량변화율 및 SEM을 이용한 표면관찰을 실시하였다. 전기로 스래그 중산화슬래그는 중량변화율이나 SEM 표면에서 큰 변화가 없었지만, 환원슬래그는 중량이 유의미하게 증가하였고, SEM 측정결과에서도 표면에 탄산칼슘 결정상인 칼사이트가 다량 생성되는 것을 확인하였다.
CO<sub>2</sub> 나노버블 에이징 시간에 따른 전로슬래그의 화학적 특성
임창민 ( Lim Chang-min ),임건우 ( Im Geon-woo ),김영민 ( Kim Young-min ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, the chemical composition of converter slag according to CO<sub>2</sub> nanobubble promotion aging time was examined. The CO<sub>2</sub> nanobubble water immersion time was 0, 12, 24, 36, 48 hours, and then dried and pulverized to perform XRD analysis. As a result, the longer the sample was immersed in CO<sub>2</sub> nanobubble water, the higher the amount of calcite produced, and the change after 36 hours was minimal.
유체해석 프로그램을 이용한 골재의 입자크기 및 입도, 구성위치에 따른 배수층의 특성 평가
임창민 ( Lim Chang-min ),권현우 ( Kwon Hyun-woo ),김영민 ( Kim Young-min ),조도영 ( Cho Do-young ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
Due to recent climate abnormalities, the form of rainfall is changing to localized torrential rains. Localized torrential rains cause flooding in urban areas. In addition, in various industrial fields, there are cases where materials necessary for the process are kept outdoors, and damage from material loss and flooding of stockyards occurs during heavy rain. Accordingly, it is necessary to introduce a drainage layer where flooding is expected. This drainage layer places the aggregate inside and allows rainwater to penetrate and drain into the voids between the aggregates. However, the amount of voids differs according to the particle size distribution and particle size of the aggregate, and the drainage performance varies according to the compositional location of the aggregate. Therefore, in this study, the drainage characteristics according to the particle size, particle size, and compositional location of aggregates are analyzed using a fluid analysis program.