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권양희(Kwon Yang-Hui),홍성걸(Hong Sung-Gul) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
The purpose of this study was to restore Mireuksajiseoktap to a structurally-stable form with safety evaluations on the structural analysis of the tower and various other design plans. In other words, as a foundational research for possible restoration of the stone tower into 7-floored or 9-floored tower through reorganization of the existing stones in the future, researches on structural safety and construction methods of the repair- and restoration-structures are necessary. In the present state of things when new improvements and restorations are ongoing, structural evaluations of such are carried out so that they could be utilized in the future restoration of Mireuksajiseoktap.
권양희(Yang-Hee Kwon),홍성걸(Sung-Gul Hong) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.4
이 연구는 제조 공정에 따른 국산 왕겨재의 재료특성 변화를 조사하는 것과 고강도 콘크리트 혼화재로서의 활용가능성을 검토하는 것을 목적으로 수행되었다. 이를 위해 왕겨재의 소성온도 (400 ℃, 650 ℃ 그리고 900 ℃) 및 분쇄 여부를 주요 변수로 두고 그것의 입도 분포, 구성 성분, 그리고 미세구조가 분석되었다. X-ray fluorescence (XRF)를 이용한 성분분석 결과, 650 ℃ 이상의 고온소성 공정을 거칠 경우, 왕겨재의 산화규소(SiO2) 함량이 92% 이상으로 향상되는 것을 확인하였다. 또한, 주사 현미경 촬영을 통해 650 ℃ 에서 소성된 왕겨가 다공성 구조인 것을 확인하였으며, 이 공정이 적용된 시편의 흡습성능이 모든 시편들 중 가장 우수하였다. 분쇄 공정 적용시 공극구조가 파괴되기 때문에 흡습능력은 더 감소하는 경향을 보였다. 반면, 900 ℃ 에서 소성된 시편은 공극구조가 발견되지 않았고, 흡수율 역시 가장 낮게 나타났다. 분석결과를 근거로, 650 ℃ 에서 소성된 왕겨재는 포졸란 반응 활성화제 뿐만 아니라 흡습성능에 의한 자기수축 저감제로서 고강도 콘크리트를 위한 혼화재로서 적합한 것으로 결론 내려진다. This study examined the material properties of Korean rice husk ash (RHA) according to the manufacturing process, and evaluated the feasibility of its use as a new admixture for high strength concrete. For this purpose, its particle size distribution, chemical composition, and microstructure were analyzed under various parameters, such as calcination temperature (400 ℃, 650 ℃, and 900 ℃) and the inclusion of a milling process. X-ray fluorescence analysis confirmed that the silicon oxide (SiO2) content of RHA was improved to more than 92% with a calcination process at 650 ℃ or higher. In addition, microstructural analysis showed that the RHA calcined at 650 ℃ has a porous structure. Because of this, the absorption capacity of the RHA was improved. On the other hand, when the milling process was applied, the porous structure was destroyed; thus, the absorption capacity tended to decrease further. Based on the analysis results, it was concluded that RHA calcined at 650 ℃ can be used as an admixture for high strength concrete, which possesses functions of both a shrinkage reducing agent and a pozzolanic activator.
권양희(Kwon Yang-Hee),홍성걸(Hong Sung-Gul) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
This study investigates the structural system of the ancient tomb at Songsan-ri and the material properties of the traditional bricks which are main components of the tomb. The study about structural system is conducted by a field survey. As a result, the optimum alternative for the system is proposed among three alternatives determined by analyzing inside corners of the tomb. In order to investigate the material properties of the traditional bricks, compressive strengths, thermal conductivities and moisture contents are also measured by some experiments. These experiments are conducted by non-destructive methods to preserve the cultural properties. The results are fundamental data to evaluate the structural safety of the tomb.