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글리콜에테르계 혼화제를 사용한 플라이애시 치환 콘크리트의 내구성능에 관한 연구
송인명(Song In-Myung),정재동(Jaung Jae-Dong),정상진(Jung Sang-Jin) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.1
Previous researches for increasing the durability of concrete structures examined the characteristics of concrete using glycol ether admixture, and determined the optimal addition rate and evaluated durability of concrete. However, today's ready mixed concrete uses various industrial byproducts in order to improve the performance of concrete, and the quality of concrete changes depending on the addition of glycol ether admixture and curing condition. Considering this, we need to understand the characteristics of curing methods according to field condition. Thus, the present study evaluated the effects of replacement with fly ash as a binder and curing conditions (temperature and humidity) on the performance of concrete, and obtained data from a mock up test for the practical use of concrete containing glycol ether admixture. According to the results of this study, the concrete showed resistance performance of around 30% to carbonation and around 40% to drying shrinkage. In addition, as for resistance to freezing and thawing, the relative dynamic modulus of elasticity was over around 85% through atmospheric curing. These performances prove the effect.
글리콜에테르계 혼화제를 사용한 콘크리트의 기초물성과 내구성능에 관한 실험적 연구
임상준(Lim Sang-Jun),김광기(Kim Kwang-Ki),백민수(Paik Min-Su),송인명(Song In-Myung),정재동(Jaung Jae-Dong),정상진(Jung Sang-Jin) 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.11
Focused on the material related aspect for enhancing the durability of concrete, the present study analyzed the effect of glycol ether admixture, which is a chemical admixture that can compact the structure of concrete by entraining air inside the concrete, on the basic physical properties and durability characteristic of the concrete. In analyzing the results of experiment, we examined the basic physical properties and durability characteristic of concrete according to addition rate based on OPC and selected the optimal addition rate. In addition, with the optimal addition rate, we added glycol ether admixture to concrete, which contained fly ash and fine blast furnace slag power used as binder and highperformance water reducing agent for reducing the unit quantity, and examined changes in the characteristics of the concrete. According to the result, the optimal addition rate of glycol ether admixture was3% of the unit quantity of cement, and the addition of binder and chemical admixture did not have a significant effect on unhardened concrete but reduced the air content. In addition, we found that the addition was effective for strength and resistance to carbonation and the change of length in hardened concrete, but improvement in resistance to freezing and thawing was relatively low because of the decrease of the air content.