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이건철 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.8
Bingham's model is generally used as a rheological model for fresh concrete. However, Bingham's model for homogeneous material is not always adequate to express the behavior of composite material such as fresh concrete. This study investigates the rheological properties, considering the integration of concrete components, for evaluating the concise concrete condition in fresh state. It is on the assumption that the state of fresh concrete is a high condensed suspension. In this paper, in order to estimate the rheological properties of suspension, this test first invented the shear box apparatus to directly measure the shear stress, shear strain and shear strain rate, and then found out the rheological constant. It also evaluated the accuracy of the shear box apparatus after comparing the experimental results of the rotation viscometer. According to the test results, the shear stress increased along with the incline of the shear strain, due to the dilatancy of solid components by shear deformation, in the rheological constant of the suspension. This tendency was even more significant as the density of the suspension increased. It is also clear that the rotation viscometer was occasionally unable to measure the rheological constant of the suspension.
시지각적 되먹임 훈련이 뇌졸중 환자의 동적자세 균형에 미치는 영향
이건철,윤정규,Lee, Geon-Cheol,Yoon, Jung-Gyu 대한물리치료과학회 2002 대한물리치료과학회지 Vol.9 No.2
This study is aimed to compare the effect of visuo-perceptual biofeedback sitting balance training and conventional sitting balance training using Balance Master on stroke patients with that of program in order to analyze the effect it has on dynamic postural balance. The subjects are twenty-four stroke patients who are receiving physical therapy in Ilsan Paik Hospital and can maintain sitting posture by themselves. These patients were divided to control group and experimental group randomly. In order to compare to control and experimental group before and after the balance training, they were tested with Mann-Whitney U test and in order to compared the changes before and after the balance training, they were tested with Wilcoxon signed-ranks test. The results are as follows: we measured the ability of dynamic posture balance control with limit of stability(LOS) test and rhythmic weight shift test. There was an increasing improvement in the ability of dynamic posture balance control of the experimental group that had visuo-perceptual biofeedback sitting balance control training using the Balance Master(p<0.05, p<0.01). According to the results from above, compared to conventional sitting balance training programs, visuo-perceptual biofeedback sitting balance control training using the Balance Master is considered to be a more valuable therapy in balance control improvement and physical function improvement. It is considered that if the weak points are made up, the training with Balance Master will give help to stroke patients and to patients with balance control disabilities and will further more contribute to successful rehabilitation therapy.
잔골재 대체재로서 바텀애쉬를 이용한 초속경 그라우트재의 수밀성 및 내구특성
이건철,오동욱,조병영,김영근,조정기,Lee, Gun-Cheol,Oh, Dong-Uk,Cho, Byoung-Young,Kim, Young-Geun,Cho, Chung-Ki 한국건설순환자원학회 2011 한국건설순환자원학회지 Vol.6 No.3
본 연구에서는 산업부산물로서 재활용율이 낮은 바텀애쉬와 혼화재를 이용하는 에코개념의 터널 보수용 초속경 그라우트 모르타르 개발을 목적으로 실시공 환경조건의 온도하에서 초속경 그라우트 모르타르의 수밀성 및 내구특성에 대하여 검토하였다. 수밀성으로 투수량 및 물흡수계수는 석탄회를 이용하는 시리즈 II의 경우가 증가하는 것으로 나타났으며, 온도조건별로는 $20^{\circ}C$ 양생조건이 $5^{\circ}C$ 양생조건 보다 투수량이 적은 것으로 나타났다. 또한, 본 연구범위 모든 시료는 KS F 4042(콘크리트 구조물 보수용 폴리머 시멘트 모르타르) 투수량 기준인 20g 이내를 만족하는 것으로 나타났다. 내구성으로 중성화 저항성은 고로슬래그 미분말로 치환 사용에 따른 단위시멘트량 감소로 약간 저하하는 것으로 나타났다. 또한, 내알칼리성 및 내산성 결과는 시리즈 I의 경우 수산화칼슘용액에 침지후의 압축강도가 침지전의 압축강도에 비해 저하하는 것으로 나타났다. 반면, 시리즈 II의 경우 강도저하가 미비한 것으로 나타났으며, $5^{\circ}C$ 양생조건의 경우 C 타입의 시멘트를 제외하고는 28일 재령의 압축강도와 동등한 값을 나타내어 고로슬래그 미분말 및 버텀애쉬를 치환 사용한 경우 내알칼리성 및 내산성이 큰 것 알 수 있었다. In this study, in order to develop ultra rapid hardening mortar(URHM) for tunnel repairs using bottom ash of low recycle ratio and Admixture as Eco concept, watertightness and durability properties of URHM on temperature condition of construction field were performed. Test result, seepage quantity and water absorption coefficient regarding watertightness of URHM were as in the following : series II > series I. Seepage quantity for the standard condition were smaller than low temperatures. all specimens were satisfied below 20g as standards of seepage quantity on KS F 4042. Because of the decrease of unit cement content by to replacement of blast furnace slag, the neutrlization resistance for durability properties was reduced. The result of alkali resistance and acide resistance, compressive strengths for specimens soaked in calcium hydroxide solution of seriesI were lower than compressive strengths for specimens not soaked. On the other hand, the case of series II show that the deterioration of compressive strengths for specimens was not almost showed. Compressive strengths of specimens soaked were similar with specimens not soaked except series II-C in $5^{\circ}C$. Therefore, specimens using both blast furnace slag and bottom ash were good in alkali resistance and acide resistance.