Earticle

초록

영어

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.

목차

Abstract
 1. 서론
  1.1. 연구의 목적
 2. 구속시험
  2.1. VRTM의 개요
  2.2. VRTM 시험기의 제어 플로우
 3. 실험계획 및 방법
  3.1. 실험계획
  3.2. 사용재료
  3.3. 콘크리트의 배합
  3.4. 시험항목
 4. 실험결과 및 고찰
  4.1. 강도 및 탄성계수
  4.2. 자기수축
 5. 결론
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저자

• 박선규 [ Park, Sun-Gyu | 목원대학교 공과대학 건축학부 건축공학전공, 공학박사 ] 교신저자

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