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경량 콘크리트의 유동성 및 역학적특성에 대한 굵은골재 최대크기의 영향
심재일,양근혁,Sim, Jae-Il,Yang, Keun-Hyeok 대한건축학회 2012 대한건축학회논문집 Vol.28 No.5
To provide the basic data for the reasonable lightweight concrete mixture design model, a test with a mixture ratio of 18 was conducted with the maximum coarse aggregate size, water-binder ratio and type of the lightweight concrete as main parameters. The slump and air content were measured from the uncured concrete, and the compression strength by age, air content, tensile strength, modulus of rupture and modulus of elasticity were measured from the cured concrete. The measured kinetic characteristics were compared with the design standard to evaluate the structural safety. The test results showed that the initial slump and air content of the lightweight concrete were higher with a smaller maximum size of the coarse aggregate. The water-binder ratio had a significant effect on the kinetic characteristics of the lightweight concrete, but the maximum size of the coarse aggregate did not. This was because the failure of the lightweight concrete penetrated the aggregate, and the resistance effect of the low-strength aggregate decreased. The test results were properly evaluated according to the ACI 318-11 design standard on the modulus of elasticity of the lightweight concrete.
폴리머수지 기반 보수모르타르에서 양생온도에 따른 미분쇄된 플라이애시 치환율의 영향
심재일,문주현,윤인구,전용수 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 논문집 Vol.19 No.4
The objective of this study is to evaluate the effects of the replacement levels of grinded fly-ash on the repaired mortar based on a polymer. The main parameters are the curing temperature and replacement levels of grinded fly-ash. The curing temperature and the replacement levels of grinded fly-ash are varied at 40℃, 20℃ and 5℃, and between 0% and 35% of the total binder by weight, respectively. The flow in fresh mortar and compressive strengths according to ages, the relationship of stress-strain, elastic modulus and modulus rupture in hardened mortar, as well as scanning the electron microscopy and the X-ray diffraction of mortar, were measured, respectively. The test results showed that the flow, elastic modulus and modulus rupture are great in mortar specimens with 20~30% of the replacement levels of grinded fly-ash. In addition, compressive strengths according to ages were affected by the replacement levels of grinded fly-ash and the curing temperature indicated that the strength development ratio of mortar with 20% of the replacement levels of grinded fly-ash was greater than others. In the prediction of the compressive strength specified by the ACI 209 code, the strength development at an early and late age can be generalized by the functions of the replacement levels of grinded fly-ash and the curing temperature. In the analysis of scanning the electron microscopy and the X-ray diffraction, the number and intensity of peaks increased and the form of CSH gels on the surface of the particle of grinded fly-ash was observed. 본 연구는 폴리머 기반 보수모르타르에 미분쇄된 플라이애시 치환율의 영향을 평가하였다. 주요변수는 양생온도와 미분쇄된 플라이애시의 치환율이다. 양생온도는 40℃, 20℃ 및 5℃로, 미분쇄된 플라이애시 치환율은 결합재 대비 0~35%로 변화하였다. 굳지 않은 모르타르에서는 플로우를, 굳은 모르타르에서는 재령별 압축강도, 응력-변형률 관계 및 탄성계수, 파괴계수를 측정하고, 주사전자현미경 및 엑스선회절기 분석을 수행하였다. 실험결과 보수모르타르의 플로우, 탄성계수 및 파괴계수는 미분쇄된 플라이애시 치환율 20~30%에서 가장 높은성능을 발휘하였다. 또한 재령별 압축강도는 미분쇄된 플라이애시 치환율과 양생온도에 현저한 영향을 받았는데, 미분쇄된 플라이애시 치환율 20%에서 초기강도 발현율이 가장 높았다. ACI 209에서 제시하고 있는 콘크리트 재령별 압축강도예측모델에서 초기 및 장기재령 강도발현 계수는 미분쇄된 플라이애시 치환율과 양생온도의 함수로 일반화할 수 있었다. 미분쇄된 플라이애시가 첨가된 페이스트는 수화생성물을 나타내는 피크(peak)의 수와 강도(intensity)가 증가되고 플라이애시 입자주변에 CSH 겔이 형성되었다.
심재일 세종대학교 1974 세종대학 논문집 Vol.6 No.-
This paper is expected to make a brief trial to present the relation between linguistic theories and their application to the teaching of English which have been developed so far. The major attempt has been made to present and develop some drills, such as minimal pair drill' substitution drill, memorization drill, memorization drill and transformation drill. It seems that all those language teaching theories developed so far are impossible to meet the goal of second language teaching to Korean stduents. It is ture that they have not found out the best methoodology as perfect as the bible. Some methods have contracted the goal of English teaching. The writer has tried to present ahd complement the application of linguistic theories to teaching of English on the basis of practical and scientific approach which the writer has internalized. It is true that there is nothing new that has been developed by the writer. The writer has just attempted to put in order the things described by some linguists.
The giant Asian mantis Hierodula chinensis Werner (Mantodea: Mantidae) new to Korea
심재일,박해철,Ho-Jong Ju,송정훈 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.1
The giant Asian mantis Hierodula chinensis Werner, 1929 is discovered for the first time from Korea. Photographs of habitus, habitats, and diagnostic characters are provided.