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Methyl Methacrylate(MMA)계 도로보수재의 인장 접착 강도 평가
지성준 ( Ji Sung-jun ),김규용 ( Kim Gyu-yong ),편수정 ( Pyeon Su-jeong ),최병철 ( Choi Byung-cheol ),박준영 ( Park Jun-young ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In this study, the tensile adhesion strength was evaluated according to KS F 4932 to assess the suitability of MMA-based repair materials for concrete roads. Two types of MMA were used. Mortar mock-ups were made and tested for adhesion strength in three different surface conditions: air, water, and salt water. Both showed strengths above the standardized strength of 0.6 MPa. Type B, which has a relatively low adhesion strength, is considered more suitable.
안료를 혼입한 고강도 시멘트 복합체의 강도 및 색상 발현의 관계특성
지성준 ( Ji Sung-jun ),김규용 ( Kim Gyu-yong ),편수정 ( Pyeon Su-jeong ),최병철 ( Choi Byung-cheol ),김문규 ( Kim Moon-kyu ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
Recently, the construction industry has seen the emergence of interior and exterior finishes using ultra-high performance concrete (UHPC) and colored concrete products using precast concrete (PC). However, the excessive amount of pigment used for coloring reduces the strength of the concrete. There is a need to improve the durability and chromaticity of colored concrete, and further analytical studies on the properties of colored concrete are also required. Therefore, in this paper, colored ultra-high strength cement composites (C-UHSCC) containing red and green inorganic pigments were prepared, and the compressive strength and color of the specimens were measured according to the age, and the correlation between strength and color was analyzed by simple linear regression analysis using R<sup>2</sup> value. The results showed that the red color was highly correlated with L* and a*, and the green color was highly correlated with a*. These results can be considered for various concrete formulations, but research is needed to suggest the optimal pigment mixing ratio for proper strength and color development.
지성준(Ji, Sung-Jun),김정은(Kim, Jeong-Eun),박완신(Park, Wan-Shin),김선우(Kim, Sun-Woo),윤현도(Yun, Hyun-Do) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
최근 Carbon-FRP (CFRP) 그리드로 보강된 철근콘크리트 보의 전단강도 보강에 대한 연구가 국내외적으로 활발하게 진행되고 있다. 본 연구에서는 CFRP 그리드로 보강된 철근콘크리트 보에 대한 기존 문헌분석을 통해 철근콘크리트 보의 전단성능을 고찰하고자 한다. Carbon-FRP (CFRP) grid was one type that was commonly used in engineering and has shown results in shear strengthening of reinforced concrete beams. The objective of this study is to investigate shear capacity of reinforced concrete beams with CFRP based on the observation experimental data in previous researcheres.
고온이 순환유리미분말을 혼입한 고강도 시멘트 복합체의 역학적 특성에 미치는 영향
박준영 ( Park Jun-young ),김규용 ( Kim Gyu-yong ),유하민 ( Eu Ha-min ),최윤성 ( Choi Youn-sung ),지성준 ( Ji Sung-jun ),남정수 ( Nam Jeong-soo ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In this study, mechanical properties of high strength cement composites (HSC) containing recycled glass powder (GP) after heating were investigated. As a result, at 100Mpa, as the heating temperature increased, the compressive strength increased while the elastic modulus decreased . At 140Mpa, after heating at 300°C, the spalling occurred excluding GP0, and it is believed to be due to the high density of HSC.
강섬유의 형상비에 따른 고강도 콘크리트의 휨 인성 특성
정우진(Jeong, Woo Jin),지성준(Ji, Sung Jun),왕기(Wang, Qi),김동휘(Kim, Dong Hwi),윤현도(Yun, Hyun Do) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 인장강도 1000MPa급의 강섬유를 고강도 콘크리트에 혼입할 경우 형상비에 따라 휨 특성 변화를 확인하고자 하였다. 실험체는 각각 형상비 64, 67, 80의 후크형 강섬유를 0.75% 혼입하여 3점 가력방식 변위제어로 진행하였으며, 평가 결과 형상비 64보다 형상비 67, 80에서 각각 20%, 21% 휨 강도가 높았고 균열 후 거동에서 형상비 67이 가장 뛰어났으며 형상비 64가 가장 거동능력이 낮은 것으로 확인되었다. This study tried to confirm the change in the bending characteristics according to the aspect ratio when steel fibers with a tensile strength of 1000 MPa are mixed into high-strength concrete. In the specimen, 0.75% of hook-type steel fibers having an aspect ratio of 64, 67, and 80 were mixed, and the displacement control was performed using a three-point loading method. It was confirmed that the aspect ratio of 67 was the most excellent in the post behavior, and the aspect ratio of 64 was the lowest in the behavior.
철근콘크리트 연결보의 강섬유 혼입을 통한 구속 철근 대체가능성 평가
김동휘(Kim, Dong Hwi),왕기(Wang, Qi),정우진(Jeong, Woo Jin),지성준(Ji, Sung Jun),윤현도(Yun, Hyun Do) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구는 복잡한 배근상세를 갖는 연결보의 배근상세 완화를 위해 수행되었으며, 강섬유보강 콘크리트의 구속 철근 대체 가능성을 평가하기 위해 실시되었다. 이를 위해 설계 압축강도 24MPa 급의 SFRC 연결보를 제작하였으며, 섬유혼입률은 0.75%로 설정하였다. This study was conducted to alleviate the reinforcement details of a coupling beam with complicated reinforcement details, and to evaluate the possibility of replacing the confining rebar in steel fiber reinforced concrete. For this, an SFRC coupling beam with a design compressive strength of 24 MPa was manufactured, and the fiber volume fraction was set at 0.75%.