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콘크리트의 수축균열에 미치는 판상-링형 구속시험방법의 시험체 치수영향 검토
남정수(Nam Jeong-Soo),김영봉(Kim Young-Bong),김영덕(Kim Young-Duck),한민기(Han Min-Ki),김규용(Kim Gyu-Yong),김무한(Kim Moo-Han) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
In this study, to present the fundamental data for quantitative evaluation of shrinkage crack, effects of specimen size of plat-ring type restrained test were examined. To examine suitable size of specimen of plat-ring type restrained test method, restrained shrinkage crack properties such as restrained drying shrinkage stress, crack area and crack point were investigated. As conditions of specimen size, inside ring diameter of specimen were l00㎜, l50㎜ and 200㎜, and outside ring diameter of specimen in 400㎜, 600㎜ and 800㎜. These conditions were investigated by real experiment and by numerical analysis of 3D solid element using the MIDAS program. As a result, it was concluded that, as suitable specimen size for plat-ring type restrained test, inside ring diameter was more than 150㎜ and outside ring diameter was 400㎜ in this experimental conditions. Hereafter, it is considered that the study concerning environmental condition and mixing factor in plat-ring type restrained test method are need.
REM 모델에 의한 Poly(methyl acrylate)-Poly(acrylonitrile) 공중합체 완화스펙트럼의 pH 영향
김남정(Nam Jeong Kim) 한국고분자학회 2013 폴리머 Vol.37 No.2
Poly(methyl acrylate)-poly(acrylonitrile) 공중합체의 응력완화 실험은 용매기를 부착한 인장 시험기를 사용하여 여러 온도의 공기 중, 증류수, pH 3, 7, 11 용액에서 실행하였다. Ree-Eyring and Maxwell 모델로부터 얻은 완화스펙트럼 식에 실험적인 응력완화 곡선을 대입하여 poly(methyl acrylate)-poly(acrylonitrile) 공중합체의 완화스펙트럼을 얻었다. 완화스펙트럼의 계산은 Laplace 변환법을 사용한 컴퓨터 프로그램을 이용하였다. 이들 시료의 완화스펙트럼은 유동단위의 분자량과 자체확산 분포와 밀접한 관계가 있음을 알 수 있었다. The stress relaxation of poly(methyl acrylate)-poly(acrylonitrile) copolymer samples was carried out in air, distilled water, pH 3, 7 and 11 solutions at various temperatures using a tensile tester equipped with a solvent chamber. The relaxation spectra of poly(methyl acrylate)-poly(acrylonitrile) copolymers were obtained by applying the experimental stress relaxation curves to the equation of relaxation spectrum derived from the Ree-Eyring and Maxwell model. The determination of relaxation spectra was performed from computer calculation using a Laplace transform method. It was observed that the relaxation spectra of these samples are directly related to the distribution of molecular weights and selfdiffusions of flow segments.