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원자짝 분포 함수를 이용한 플라이애시를 대량 치환한 시멘트 클링커의 나노 구조 변형 거동 해석
지현석 ( Jee Hyeon-seok ),박재연 ( Park Jae-yeon ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Recently, supplementary cementitious materials such as blast-furnace slag, fly ash and silica fume have been widely used as substitutes for cementitious materials. In this study, the deformation behavior of compressive loading of C<sub>3</sub>S paste with 50% fly ash was analyzed by X-ray scattering data and pair distribution function analysis. The obtained results were compared with 131-day-old pure C<sub>3</sub>S paste. The Ca(OH)<sub>2</sub> of the C<sub>3</sub>S-FA paste showed almost complete elastic behavior, consistent with the deformation behavior of the r-range of 20 to 40, and the C-S-H phase contributed to the range of PDF r-range of less than 20. In addition, C-S-H of C<sub>3</sub>S-FA showed greater deformation resistance than C<sub>3</sub>S paste.
MCNP 시뮬레이션을 통한 폴리에틸렌 코팅 탄화붕소 혼입 시멘트 페이스트의 중성자 차폐 성능 평가
박재연 ( Park Jae-yeon ),지현석 ( Jee Hyeon-seok ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
To develop an effective shielding material for spent fuel that emits fast neutrons is necessary. In this study, thermal neutron and fast neutron shielding performance of polyethylene coated boron carbide-incorporated cement paste was quantitatively analyzed by Monte Carlo N-Particle transport code (MCNP) simulations. As the results of the simulations, fast neutrons were effectively shielded through large quantity of hydrogen and boron elements in polyethylene and boron carbide.
원자짝 분포 함수를 이용한 칼슘 실리케이트 경화체의 나노 구조 변형 거동 해석
배성철 ( Bae Sung-chul ),장유현 ( Chang Yoo-hyun ),지현석 ( Jee Hyeon-seok ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.2
Calcium Silicate Hydrate (C-S-H), which takes up most of the hydration products of Portland Cement (PC), has the greatest impact on the mechanical behavior and strength development of concrete. The exact mechanism of its deformation, however, has not yet been elucidated. The present study aims to demonstrate the mechanism of nano-deformation behavior of C-S-H in tricalcium silicate paste under compressive loading, unloading and reloading by interpreting atomic pair distribution function (PDF) based on synchrotron X-ray scattering. The strain of the tricalcium silicate paste for a short-range of 0 ~ 20 A under compressive load exhibited two stages, I) nano-packing of interlayer of C-S-H and II) micro-packing of C-S-H globules, whereas the deformation for a long-range order of 20 ~ 40 A was similar to that of a calcium hydroxide phase measured by Bragg peak shift. Moreover, the residual strains due to the plastic deformation of C-S-H was clearly observed.