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임건우 ( Im Geon-woo ),임창민 ( Lim Chang-min ),김영민 ( Kim Young-min ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, the hydration characteristics of conductive grout materials for each binder were investigated using XRD, and as a result of the experiment, the specimen with UFFA consumed more Ca(OH) ₂ than the specimen with other binders, which is judged to have activated the pozzolanic reaction of UFFA, a high powder.
열중량분석에 의한 고온노출 시멘트 경화체의 이산화탄소 나노버블 회복 검토
임건우 ( Im Geon-woo ),임창민 ( Lim Chang-min ),김영민 ( Kim Young-min ),허영선 ( Heo Yung-sun ),이건철 ( Lee Gun-cheol ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
고온에 노출된 시멘트 페이스트를의 경우 수화물 분해가 발생하며, 대기중에서 CO<sub>2</sub> 나노버블을 이용해 탄산화 및 안정화를 유도하는 연구를 진행 중에 있으며, 본 연구에서는 열중량 분석을 통해 회복된 시멘트 페이스트의 탄산화 및 안정화를 검토하였다. 검토 결과, CO<sub>2</sub> 나노버블을 활용한 회복방법이 대기중보다 안정화되는 것으로 확인되며, 회복기간은 7일에서 더 효과적인 것으로 나타났다.
IGCC FA 및 CNT 혼입 저시멘트 모르타르의 역학적 특성
임건우 ( Im¸ Geon-woo ),임창민 ( Lim¸ Chang-min ),김영민 ( Kim¸ Young-min ),이건철 ( Lee¸ Gun-cheol ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구에서는 탄소나노튜브 혼입 저시멘트 모르타르의 압축강도 특성을 검토하였다. 시멘트 대체율은 40%, 대체재료는 일반 플라이애시, 고로슬래그 IGCC 플라이애시가 사용되었다. 재령 3일의 압축강도 특성은 혼화재료가 혼합 된 시험체는 OPC 대비 전반적으로 낮은 경향을 보였으나, IGCC FA의 경우 재령 7일 이후 높은 강도발현을 확인하였다.
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 ),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.
윤승조 ( Yoon Seong-joe ),임건우 ( Im Geon-woo ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
This study evaluated the compressive strength after making mortar with low cement composition for carbon-neutral steam curing to respond to climate change. Blast furnace slag, fly ash, and ultra-high powder fly ash were used as substitutes for cement. The cement substitute was used at 40% of the mass of cement, and after steam curing, the compressive strength was measured on the 1st, 3rd, 7th and 28th days of age. As a result of the experiment, at the age of 1 day, the mixture using only cement showed the highest strength, but from the 3rd day, the specimen using ultra-high powder showed a high strength development rate, followed by blast furnace slag and fly ash.