섬유보강 순환골재 콘크리트의 역학적 특성에 관한 연구 = A Study on the Mechanical Properties of Fiber-Reinforced Recycled Aggregate Concrete

다국어 초록 (Multilingual Abstract)

The purpose of this study was to examine mechanical and material properties which recycled aggregate and fiber had upon reinforced concrete. This study was initiated to use recycled concrete as a substitutive coarse aggregate of structural concrete. For this, the investigator worked out experimental specimens according to the replacement rate of recycled aggregate (30%, 60%), the kinds of fibers and whether or not fiber-reinforced, and then carried out an experiment of materials and secondary materials. Study findings are as follows.

First, the results of age-oriented compressive strength test showed that when the replacement rate of recycled aggregate increased, specimens' age-oriented compressive strength decreased, such as a fiber-reinforced specimen decreasing by about 3.1∼18.4%, a steel fiber-reinforced specimen by about 1.7∼18.5%, a polypropylene fiber-reinforced specimen by about 2.4%∼19.8%, and a structural synthetic fiber reinforced specimen by about 2.3～13.4%.
Second, the results of age-oriented splitting tensile strength test showed that when the replacement rate of recycled aggregate increased, specimens' splitting tensile strength decreased, such as a non-reinforced specimen decreasing by about 1.6∼19.5%, a steel fiber-reinforced specimen by about 3.6∼13.0%, a polypropylene fiber-reinforced specimen by about 8.4∼17.1%, and a structural synthetic fiber reinforced specimen by about 1.9∼8.4%.

Third, the results of compressive strength test after the experiment of refractoriness showed that specimens' persistence rate of compressive strength increased by refractory temperatures, such as a non-reinforced specimen increasing by about 0.5∼7.7%, and a fiber-reinforced specimen by about 0.1∼15.8%.

Fourth, the results of freezing and thawing experiment showed that when the replacement rate of recycled aggregate increased, specimens' relative dynamic modulus of elasticity decreased by about 0.7∼%, whereas comparing to a non-reinforced specimen a steel fiber-reinforced specimen increased by about 0.2∼0.9%, a polypropylene fiber-reinforced specimen by about 0.2∼1.1%, and a structural synthetic fiber reinforced specimen by about 0.1∼0.9%.

In particular, the reinforcement of recycled aggregate concrete with fibers seems to change the brittle fracture behavior, a disadvantage point of recycled aggregate concrete, to the ductile fracture behavior. In addition, since the specimen of 30% fiber-reinforced recycled aggregate showed more compressive strength, tensile strength and shear resistance than a standard specimen did, the 30% replacement of recycled aggregate could be applied to actual structures.

목차 (Table of Contents)

• 목 차
• 기 호
• Abstract
• Ⅰ. 서 론 1
• 1.1 연구배경 및 목적 1
• 1.2 연구의 범위 및 방향 3
• 1.3 연구 진행 흐름도 4
• Ⅱ. 이론적 연구 5
• 2.1 순환골재의 특성 및 기준 5
• 2.1.1 순환골재의 특성 품질기준 5
• 2.1.2 순환골재 품질 기준(국토해양부 2009년 6월 1일 개정) 7
• 2.2 순환골재에 관한 관련 국내법규 8
• 2.2.1 건축법(제66조 건축물 에너지 이용 및 폐자재 활용) 8
• 2.2.2 건축법 시행령 (제91조 건축물 에너지 이용 및 폐자재 활용) 8
• 2.2.3 건축폐자재의 활용기준(2008년 10월 29일 개정) 9
• 2.2.4 건설폐기물의 재활용 촉진에 관한 법률(2009년 6월 9일 개정) 9
• 2.3 기존 연구의 동향 11
• 2.3.1 해외 연구의 동향 11
• 2.3.2 국내 연구의 동향 12
• 2.4 폐기물 발생 및 처리현황 14
• 2.4.1 폐기물 및 처리현황 14
• 2.4.2 건설폐기물의 발생 및 처리현황 15
• 2.5 순환골재 재활용 현황 17
• 2.5.1 국외 순환골재 활용 현황 17
• 2.5.2 국내 순환골재 활용 현황 18
• Ⅲ. 실험계획 20
• 3.1 실험 개요 20
• 3.2 실험 기기 21
• 3.3 실험 변수 22
• 3.4 사용 재료 23
• 3.4.1 시멘트 23
• 3.4.2 골재 23
• 3.4.3 섬유 24
• 3.4.4 철근 25
• 3.4.5 AE 감수제 26
• 3.5 콘크리트의 배합 27
• 3.6 실험 방법 28
• 3.6.1 콘크리트의 압축강도실험 28
• 3.6.2 콘크리트의 인장강도실험 28
• 3.6.3 콘크리트 내화도(耐火度)실험 29
• 3.6.4 콘크리트 동결융해(凍結融解)실험 30
• 3.6.5 부재 실험 32
• Ⅳ. 재료실험 결과 34
• 4.1 압축강도실험 결과 34
• 4.2 쪼갬 인장강도실험 결과 41
• 4.3 내화도(耐火度)실험 결과 48
• 4.4 동결융해실험 결과 54
• Ⅴ. 철근 콘크리트 보의 전단실험 결과 56
• 5.1 전단실험 결과 56
• 5.2 균열 및 파괴 성상 64
• 5.2.1 섬유 무보강 순환골재 전단실험체의 균열 및 파괴 성상 64
• 5.2.2 강섬유 보강 순환골재 전단실험체의 균열 및 파괴 성상 67
• 5.2.3 PP섬유 보강 순환골재 전단 실험체의 균열 및 파괴 성상 70
• 5.2.4 SS섬유 보강 순환골재 전단 실험체의 균열 및 파괴 성상 73
• 5.3 전단실험체의 연성(延性) 평가 76
• 5.3.1 섬유 무보강 순환골재 전단실험별 연성평가 76
• 5.3.2 강섬유 보강 순환골재 전단실험별 연성평가 79
• 5.3.3 PP섬유 보강 순환골재 전단실험별 연성평가 82
• 5.3.4 SS섬유 보강 순환골재 전단실험별 연성평가 85
• Ⅵ. 결론 88
• 참고문헌