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조홍범(Cho Hongbum),윤상천(Yoon Sangchun),지남용(Jee NamYong) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.4
There are only a few tests to ensure concrete quality before placing in domestic construction site; One is the slump test for workability, the others are the air content test and the chloride content test for durability. The concrete compressive strength which is the one of important factors to influence on concrete quality was tested after 28 days when placed. Methods for early estimation of concrete strength have been introduced for concrete quality control, but such methods are expensive, and required experienced skill and time. Therefore, these have difficulties in situ application for concrete quality control. The subject of this study is the result of 1442 compressive strength tests on 59 different kinds of mix design with specified compressive strength of 180∼270kgf/㎠, water-cement ratio of 0.39∼0.62, Gmax 25㎜, and slump of 12∼15㎝. This study aimed at reviewing application of prediction equation of compressive strength as a means of strength control of ready-mixed concrete, making an regression equation which enables to estimate compressive strength at 28 days by multiple linear regression analysis on the basis of mix proportion of ready-mixed concrete and compressive strength testresults of construction site.
염해환경 하에서 지속하중이 철근콘크리트 부재의 내구성에 미치는 영향에 관한 실험연구
윤상천 경주대학교 2002 論文集 Vol.15 No.-
This study was performed to evaluate reinforced concrete durability in chloride attack environment under sustained load by the corrosion of reinforcing bars and the permeation of chloride ion. Generally, it is regarded that permeability of chloride ion is determined by the properties of concrete, but the effects of load which make alternation of concrete inner structure such as crack and so on should not neglected. In this study, it is shown that the relation between bending load on RC beam, deflection and crack of specimen, permeation of chloride ion, rating of re-bar corrosion, and the relation between compression load and permeation of chloride ion. Therefore, the effects of load on permeation of chloride ion and re-bar corrosion are evaluated.