초속경시멘트를 사용한 조기강도 콘크리트의 성능향상에 관한 연구 = Enhanced performance of high early strength concrete with regulated set cement

다국어 초록 (Multilingual Abstract)

The growth in concrete structure repair has prompted major efforts to develop high early strength concrete. Such concrete relies on the use of regulated set cement to increase the rate of strength development. This measure, however, seems to have compromised the long-term performance of concrete structure as evidenced by occasional premature deterioration. The internal or external restraint of thermal and dry shrinkage movements could thus generate tensile stresses in high early strength concrete using regulated set cement. Restrained shrinkage and thermal stresses could produce microcracks in concrete which increase its permeability and accelerate its long-term deterioration under weathering and load effects. Fiber reinforced concrete is an effective approach to the control of microcrack and crack development under tensile stresses.
This study aims at evaluation of the properties of high early strength concrete using regulated set cement, increase of service life and the establishment of optimum(economical) mixture proportion in expense. Regulated set cement and two different types of fiber were adopted in this study. It was conducted with experiments of mechanical, physical and durable characteristics. Laboratory test results confirmed the desirable resistance of high early strength fiber reinforced concrete to restrained shrinkage microcracking and cracking. The use of fibers allowed development of high early strength concrete materials using regulated set cement than the plain mixture. It is considered that optimum mixture suggested in this study enhances not only durability but also economical benefit.

목차 (Table of Contents)

• 목차
• List of Tables = v
• List of Figures = vii
• Abstract = xi
• I. 서론 = 1
• 1.1 연구배경 및 목적 = 1
• 1.2 연구범위 및 내용 = 4
• II. 연구사 = 5
• 2.1 초속경시멘트 = 5
• 2.1.1 초속경시멘트의 수화반응 = 6
• 2.1.2 초속경시멘트의 적용가능 분야 = 9
• 2.2 조기강도 콘크리트 = 10
• 2.2.1 조기강도 콘크리트의 종류 = 10
• 2.2.2 조기강도 초속경 콘크리트의 역학적특성 = 13
• 2.2.3 조기강도 콘크리트의 시공순서 = 16
• 2.3 조기강도 섬유보강 콘크리트 = 18
• 2.3.1 조기강도 섬유보강 콘크리트의 역학적특성 = 20
• 2.3.2 조기강도 섬유보강 콘크리트의 내구특성 = 24
• III. 조기강도 섬유보강 콘크리트의 굳지 않은 콘크리트 및 역학적 특성 = 26
• 3.1 개요 = 26
• 3.2 사용재료 = 26
• 3.1.1 시멘트 및 골재 = 26
• 3.1.2 보강섬유 = 27
• 3.3 배합설계 = 28
• 3.4 실험방법 = 30
• 3.4.1 슬럼프 및 공기량 = 30
• 3.4.2 응결시간 및 수화열 = 30
• 3.4.3 압축강도 = 30
• 3.4.4 휨강도 = 31
• 3.4.5 충격저항성 = 31
• 3.5 실험결과 = 32
• 3.5.1 슬럼프 및 공기량 = 32
• 3.5.2 응결시간 및 수화열 = 34
• 3.5.3 압축강도 = 36
• 3.5.4 휨강도 = 39
• 3.5.5 충격저항성 = 42
• 3.6 요약 및 결론 = 44
• IV. 조기강도 섬유보강 콘크리트의 수축특성 = 46
• 4.1 개요 = 46
• 4.2 실험방법 = 47
• 4.2.1 건조수축 = 47
• 4.2.2 자기수축 = 49
• 4.3 실험결과 = 50
• 4.3.1 건조수축 = 50
• 4.3.2 자기수축 = 51
• 4.4 요약 및 결론 = 53
• V. 조기강도 섬유보강 콘크리트의 내구특성 = 54
• 5.1 개요 = 54
• 5.2 실험방법 = 54
• 5.2.1 염소이온투과시험 = 54
• 5.2.2 마모저항성 = 57
• 5.2.3 동결·융해반복 = 58
• 5.2.4 표면박리저항성 = 59
• 5.2.5 건조-습윤반복실험 = 61
• 5.3 실험결과 = 61
• 5.3.1 염소이온투과시험 = 61
• 5.3.2 마모저항성 = 63
• 5.3.3 동결·융해반복 = 66
• 5.3.4 표면박리저항성 = 69
• 5.3.5 건조-습윤반복실험 = 71
• 5.4 요약 및 결론 = 74
• VI. 결론 = 76
• VII. 참고문헌 = 79