팽창재를 사용한 약재령 고성능콘크리트의 구속응력거동에 관한 연구 (A Study on the Restriction Stress Behavior of High Performance Concrete Used Expansive Additive at Early Age)

서지정보

· 발행기관 : 대한건축학회지회연합회
· 수록지 정보 : 대한건축학회연합논문집 / 11권 / 2호 / 241 ~ 248페이지
· 저자명 : 박선규

초록

High performance concrete with high-strength and improved durability has brought new opportunities to the construction industry. However, some attention was given to characteristics of such concrete, in particular with respect to their cracking sensitivity. It has been argued and demonstrated experimentally that a low water/cement ratio concrete may undergoes shrinkage due to self-desiccation. If this shrinkage is restrained, the concrete may crack. This autogenous shrinkage cracking is a major concern for the durability and aesthetic of concrete structures. One possible method to reduce the adverse effects of cracking due to autogenous shrinkage is the addition of expansive additive. Tests conducted by many research have shown the beneficial effects of addition of expansive additive. However, much of the study on the this problem has been based on determination of free shrinkage strains. Yet, to assess the problem properly, stresses developed under restrained conditions should be evaluated. Only limited study has been done in this area.
The purpose of this study was to evaluate mechanical behaviors of high performance concrete such as components of strain, shrinkage stress, creep and creep coefficient with and without expansive additive at early age. Finally, the paper discusses on the control of autogenous shrinkage cracking by means of expansive additive in high performance concrete. The result show the development stress of high performance concrete using expansive additive under simulated complete restrained condition at early age. Also, the tensile stress caused by restrained at high performance concrete using expansive additive is lower than that of normal high performance concrete.

영어초록

High performance concrete with high-strength and improved durability has brought new opportunities to the construction industry. However, some attention was given to characteristics of such concrete, in particular with respect to their cracking sensitivity. It has been argued and demonstrated experimentally that a low water/cement ratio concrete may undergoes shrinkage due to self-desiccation. If this shrinkage is restrained, the concrete may crack. This autogenous shrinkage cracking is a major concern for the durability and aesthetic of concrete structures. One possible method to reduce the adverse effects of cracking due to autogenous shrinkage is the addition of expansive additive. Tests conducted by many research have shown the beneficial effects of addition of expansive additive. However, much of the study on the this problem has been based on determination of free shrinkage strains. Yet, to assess the problem properly, stresses developed under restrained conditions should be evaluated. Only limited study has been done in this area.
The purpose of this study was to evaluate mechanical behaviors of high performance concrete such as components of strain, shrinkage stress, creep and creep coefficient with and without expansive additive at early age. Finally, the paper discusses on the control of autogenous shrinkage cracking by means of expansive additive in high performance concrete. The result show the development stress of high performance concrete using expansive additive under simulated complete restrained condition at early age. Also, the tensile stress caused by restrained at high performance concrete using expansive additive is lower than that of normal high performance concrete.

참고자료

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