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알칼리회복제의 현장 적용에 따른 노후화된 콘크리트 특성에 관한 실험적 연구
김광기(Kim Kwang Ki),박선길(Park Sun Gil),김우재(Kim Woo Je),김근허(Kim Keun Hur),송병창(Song Byung Chang),정상진(Jung Sang Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
As the durability, reparability and maintainability of reinforced concrete structures are emphasized, the early performance degradation of concrete structures becomes a serious problem. Moreover, defects in construction materials and constructions inconsistent with the design promote the degradation of performance. Some worst buildings have fallen into an irreparable state within a few years. In particular, carbonation in concrete structures has been handled as the most fundamental and critical factor related to the durability of reinforced concrete. As a result, there have been efforts to develop repair materials to control carbonation. As one of these efforts, alkali recovery agents have been presented as materials for increasing the re-alkalization and durability of carbonated concrete structures. However, in applying them in the field, the performance and quality of concrete recovered after an alkali recovery agent is applied has not been fully assessed. Therefore, to examine the recovered performance of concrete structures resulting from the application of an alkali recovery agent, the present study assessed the depth of carbonation and the degree of deterioration of 20 years or older reinforced concrete structures, and analyzed the quality of concrete after applying an alkali recovery agent to the structures. This study aimed at providing basic information for the application of alkali recovery agents in the field. In this experiment, alkali recovery agents of the lithium silicate line, which are most common in Korea, were applied and cured using concrete of the same size. The degree of recovery was investigated according to the length of time in the initial curing stage, and based on the investigation, the maintenance performance of the alkali recovery agent was assessed according to the age of exposure to the open air. For these tasks, this experiment sampled concrete of different degrees of deterioration, applied alkali recovery agents to them, and observed re-alkalization and changes in the internal texture of the concrete.
노후화된 콘크리트 구조물에 적용되는 알칼리회복제의 성능에 관한 실험적 연구
김광기(Kim Kwang Ki),박선길(Park Sun-Gil),김우재(Kim Woo Jae),송병창(Song Byung Chang),정재욱(Chong Jae uk),정상진(Jung Sang Jin) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.2
Carbonation is a representative mechanism of performance deterioration with the lapse of time occurring in ordinary environments. It gradually approaches to reinforcing bars inside and causes the corrosion of reinforcing bars, and finally damages the structural appearance by stripping covering concrete off or incurring sectional loss and influences the internal force of concrete members. As an effort to prevent damages due to the carbonation of concrete structures or to improve the performance of deteriorated concrete structures, alkalinity Recovery Agent, which has the capacity to restore and reinforce concrete structure, is recently being utilized.The outer walls of concrete structures are usually finished with mortar. Thus, mortar finish is directly exposed to carbonation and various deteriorating phenomena, and is more vulnerable to external influences for the long run than concrete inside the mortar. Thus, it was believed that a test on mortar finish, which reacts on carbon dioxide first, would provide a base for assessing the performance of alkalinity Recovery Agent in restoring concrete, so this study examined the performance of alkalinity Recovery Agent by digesting a mortar test piece in alkalinity Recovery Agent for a certain length of time and then leaving it in the open air.
슬래그 골재를 활용한 콘크리트 특성에 대한 기초적 연구
박정우,박희곤,김광기,박선길,임남기,정상진 대한건축학회 2001 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.21 No.1
Several studies have reported that Granulated Blast-Furnace Slag improved the properties of concrete. The Granulated Blast-Furnace Slag could be a good alternative in the shortage of aggregate situation. Slag shows the possibility of influential aggregate and effect of environment preservation. This study presents that the basic properties of fresh concrete using Air-cooled Blast-furnace slag aggregate and Water-cooled Blast-furnace slag aggregate. Testing Factors of this study are concrete slump, slump loss, bleeding, and air contents. The result of this study is below. 1) In case of proportion slag and grave is 50 to 50, the biggest slump value is measured. 2) In the concrete using of air-cooled Blast-furnace slag aggregate, the bleeding capacity is a little. In the concrete using of Water-cooled Blast-furnace slag aggregate, the bleeding capacity goes up to 50% increase. 3) As substitution rate of the granulated blast-furnace slag goes up, air content is increased.