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XRD 분석을 이용한 저온 가열 시멘트 페이스트 경화체의 성분 검토
지우람 ( Ji Woo Ram ),신기돈 ( Shin Ki Don ),이건철 ( Lee Gun Cheol ),허영선 ( Heo Young Sun ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
In this study, the chemical deformation of cement pastes was determined by chemical analysis. X-ray diffraction equipment was used to investigate the chemical transformation. The decrease of ettringite and the collapse of gypsum were confirmed and then the calcium hydroxide gradually decreased.
TGA를 이용한 고온 조건에 노출된 시멘트 페이스트 경화체의 질량감소율 특성
지우람 ( Ji Woo-ram ),신기돈 ( Shin Ki-don ),조현서 ( Cho Hyeon-seo ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
In this study, TGA analysis of hardened cement paste with fire damage was performed. The mass reduction rate of 600 ℃ specimens was about 22 ~ 25%, and the sample of 800 ℃ showed the mass loss rate of 9 ~ 13%. As the target temperature and hold time increased, the mass reduction rate decreased. As the depth increased, the mass reduction rate decreased.
지우람 ( Ji Woo Ram ),신기돈 ( Shin Ki Don ),조현서 ( Cho Hyun Seo ),이건철 ( Lee Gun Cheol ),허영선 ( Heo Young Sun ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this research is underway to determine the exact damage level of concrete structures damaged by fire. Cement paste hardened at 700℃ was characterized by TGA. As the depth increased, the mass reduction rate increased and the mass reduction rate decreased as the retention time increased.
지우람 ( Ji Woo Ram ),박지웅 ( Park Ji Woong ),이건철 ( Lee Gun Cheol ),허영선 ( Heo Young Sun ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.1
In this study, we study the characteristics of thermal diffusion of cement paste at elevated temperature. Results of the experiments can be used to predict the fire damaged temperatures of concrete, and to recommend proper methods for repair and rehabilitation.
미시 분석을 통한 고온 가열된 콘크리트의 내부 수화물 변화 특성
지우람 ( Ji Woo-ram ),신기돈 ( Shin Ki-don ),조현서 ( Cho Hyeon-seo ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
The In this study, the change of composition of the hydrates according to the recovery age of concrete in the case of fire damage was confirmed through microscopic analysis. In 28 days of age, the production of ettringite was higher than that of day 1, and the calcium hydroxide was increased in the 91 day. It has been recovered through the generation of major hydrates which affect the strength.
FT-IR 분석을 이용한 저온 가열 시멘트 페이스트 경화체의 성분 분석
지우람 ( Ji Woo Ram ),박지웅 ( Park Ji Woong ),이건철 ( Lee Gun Cheol ),허영선 ( Heo Young Sun ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
In this study, the chemical deformation of cement pastes was determined by chemical analysis. The specimen for FT-IR analysis was prepared in the form of fine powder by grinding before heating. As the temperature increased, the hydrates inside the cement paste tended to decrease.
X-선 회절 분석을 통한 고온 피해 시멘트 경화체의 성분 변화 분석
지우람 ( Ji Woo-ram ),박지웅 ( Park Ji-woong ),신기돈 ( Shin Ki-don ),이건철 ( Lee Gun-cheol ),허영선 ( Heo Young-sun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
In this study, the change of composition of cement hardened at high temperature through XRD was observed. The specimen was made of cement paste and the heating rate condition was applied at rapid thermal annealing (10.0℃ / min). The decrease of calcium hydroxide was not confirmed, but the calcium carbonate tended to be impossible or decreased after 800℃. Calcium silicate and larnite were observed to increase with increasing temperature. It is considered that silicic acid, which is a stable structure due to the decomposition of calcium silicate, is changed into a phase such as lime.
지우람 ( Ji Woo-ram ),박지웅 ( Park Ji Woong ),신기돈 ( Shin Ki Don ),이건철 ( Lee Gun-cheol ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
In this study, the cracking characteristics of cured pastes at 800℃ were investigated by X-ray CT. The test specimens were fabricated with and without aggregate, and the heating rate condition was applied at rapid heating (10.0℃/min). It is considered that the rapid heating condition does not cause a temperature gradient phenomenon because the temperature difference between the surface and the center of the sample is small due to a low heating rate unlike an actual fire. The cracking condition of the specimens without aggregate was more severe than that of specimens with aggregate.