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고류동(高流動) 모르터를 이용(利用)한 구조체(構造體) 콘크리트의 재료분리결함(材料分離缺陷) 보수사례(補修事例)
윤기원 ( Yoon Gi Won ),강의영 ( Jiang Yi Rong ),오선교 ( Oh Seon Kyo ),한천구 ( Han Cheon Goo ),반호용 ( Bahn Ho Yong ) 한국구조물진단유지관리공학회 1998 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.2 No.1
Honeycomb in concrete structure caused by being lack of fine aggregate(sand-aggregate ratio), high dropping point of concrete when placing and unsuitable tampering have been often reported in construction field. It doesn't make the problems related to the internal forces of structure, whereas it may causes the deterioration of durability by neutralization, in this paper, the repair technique on the honeycomb in concrete structure by applying the grouting method of high fluidity mortar are discussed.
염해 · 중성화 복합열화작용을 받는 콘크리트의 염소이온 확산특성에 관한 실험연구
오병환 ( Oh¸ Byung-hwan ),강의영 ( Jiang¸ Yi-rong ),정상화 ( Jung¸ Sang-hwa ),김선우 ( Kim¸ Sun-woo ),서정문 ( Seo¸ Jeong-moon ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The studies on chloride diffusion of concrete have been done by a lot of researchers. However, there is few studies made to clear the effects of other attacks, like carbonation, on chloride diffusion properties. In this study, the experiments are carried out focusing on this by varying cement type, water to cement ratio and replacement of fly ash of concrete. The results show that carbonation attacks do not effect chloride diffusion properties of plain concrete greatly, while the different tendencies are exhibited for fly ash concrete. Therefore, it is desirable to consider the factors of carbonation attacks in using current chloride diffusion model to predict the penetration of chloride ion if fly ash is partially replaced for cement.
석회암 골재를 사용한 콘크리트에 대한 비파괴 강도 평가연구
오병환 ( Oh¸ Byung-hwan ),강의영 ( Jiang¸ Yi-rong ),인광진 ( In¸ Kwang-jin ),김지철 ( Kim¸ Ji-cheol ),이승석 ( Lee¸ Seung-suk ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The non-destructive tests are widely used to predict the strength of existing structures. However, the current prediction equations give no satisfactory results when the aggregate, water to cement ratio, ages of concrete are different. The purpose of the present study is to propose the prediction equations for strength evaluation of concrete with limestone aggregate focusing on the rebound method and ultrasonic pulse velocity method. The major test variables include water to cement ratio and curing methods. The water to cement ratios are 0.3, 0.4, 0.5, 0.6, 0.7 respectively and the curing methods cover air-dry condition and standard curing condition. The present study indicates that the test data and the proposed equations agree well with each other.