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      폐인산석고의 증기양생용 고강도 콘크리트 혼화재로서의 적용성 평가 = Utilization of Waste Phosphogypsum for High Strength Concrete Products cured by Steam

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      https://www.riss.kr/link?id=T9370092

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      다국어 초록 (Multilingual Abstract)

      As Gypsum reacts with C_(3)A(tri-calcium aluminate) and C_(4)AF(tetra calcium alumino ferrite) at initial hydration of cement, assists the hydrolysis of C_(3)S(tri-calcium silicate), the producing rate of ettringite (3C_(3)Aㆍ3CaSO_(4)ㆍ32H_(2)O) and C-S-H gel is accelerated. Therefore it was certain that compressive strength of cement and concrete was improved due to the effect of Gypsum.
      The purpose of this study is to utilize waste phosphogypsum into Admixture for high strength concrete at steam curing.
      For the study, waste phosphogypsum is made use of 5 types by specific gravity distribute which is simple and physical dry process and 4 foams (Dihydrate, Hemihydrate, TypeⅢ-Anhydrite and TypeⅡ-Anhydrite) which is changed to in low temperature.
      Also, various admixtures were made of waste phosphogypsum(PG) and Pozollanic fine poweders(Fly-ash, Blat Furnace Slag), and the basic porperties of the cement mortars incorporating with these admixtures were examined and analyzed under a verity of experimental conditions.
      Also, based on the study of cement mortars, properties of compressive strength of OPC and alternative admixture(specimen name PG2-2MF) for High-Strength Concrete at steam curing air-dry, were compared with each other.
      The conclusion obtained from this study can be summarized as follows:
      (1) As additives for high strength, waste phosphogypsum content was found properly out 7.5% and being harmful to later age strength for added more large content. This reason is that formation of needle-like ettringite crystals.
      (2) By specific gravity distribute all the types of compressive strenth is higher than OPC. In hemihydirat and typeⅢ-anhydrite cases, these is similar to typeⅡ-anhydrite from compressive strength and are greate in the effect of strength improvement.
      (3) Compressive strength value in steam cured mortars at water binder ratio 45%, mortars with PG2-1(M), PG2-2(MB), PG2-3(MF) manufactured in present study developed 668, 688, 712.8 kgf/㎠ at 28 days, respectively. Therefore, it is possible to manufacture of high strength mortar in order to get compressive strength of 650kgf/㎠.
      (4) Alternative admixture PG2-2(MB), which was determined form the results of cement mortar test, is able to manufacture of high strength concrete up to 495.1 kgf/㎠ by only steam curing at 7days.
      (5) As a result of this study, it was proved that specimens made on type Ⅲ-anhydrite of waste phosphogypsum and flyash increased on the compressive strength of mortar and concrete was as good as concrete with type Ⅱ-anhydrite.
      Consequently, it was proved that a high strength concrete was able to be made with such alternative admixture.
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      As Gypsum reacts with C_(3)A(tri-calcium aluminate) and C_(4)AF(tetra calcium alumino ferrite) at initial hydration of cement, assists the hydrolysis of C_(3)S(tri-calcium silicate), the producing rate of ettringite (3C_(3)Aㆍ3CaSO_(4)ㆍ32H_(2)O) an...

      As Gypsum reacts with C_(3)A(tri-calcium aluminate) and C_(4)AF(tetra calcium alumino ferrite) at initial hydration of cement, assists the hydrolysis of C_(3)S(tri-calcium silicate), the producing rate of ettringite (3C_(3)Aㆍ3CaSO_(4)ㆍ32H_(2)O) and C-S-H gel is accelerated. Therefore it was certain that compressive strength of cement and concrete was improved due to the effect of Gypsum.
      The purpose of this study is to utilize waste phosphogypsum into Admixture for high strength concrete at steam curing.
      For the study, waste phosphogypsum is made use of 5 types by specific gravity distribute which is simple and physical dry process and 4 foams (Dihydrate, Hemihydrate, TypeⅢ-Anhydrite and TypeⅡ-Anhydrite) which is changed to in low temperature.
      Also, various admixtures were made of waste phosphogypsum(PG) and Pozollanic fine poweders(Fly-ash, Blat Furnace Slag), and the basic porperties of the cement mortars incorporating with these admixtures were examined and analyzed under a verity of experimental conditions.
      Also, based on the study of cement mortars, properties of compressive strength of OPC and alternative admixture(specimen name PG2-2MF) for High-Strength Concrete at steam curing air-dry, were compared with each other.
      The conclusion obtained from this study can be summarized as follows:
      (1) As additives for high strength, waste phosphogypsum content was found properly out 7.5% and being harmful to later age strength for added more large content. This reason is that formation of needle-like ettringite crystals.
      (2) By specific gravity distribute all the types of compressive strenth is higher than OPC. In hemihydirat and typeⅢ-anhydrite cases, these is similar to typeⅡ-anhydrite from compressive strength and are greate in the effect of strength improvement.
      (3) Compressive strength value in steam cured mortars at water binder ratio 45%, mortars with PG2-1(M), PG2-2(MB), PG2-3(MF) manufactured in present study developed 668, 688, 712.8 kgf/㎠ at 28 days, respectively. Therefore, it is possible to manufacture of high strength mortar in order to get compressive strength of 650kgf/㎠.
      (4) Alternative admixture PG2-2(MB), which was determined form the results of cement mortar test, is able to manufacture of high strength concrete up to 495.1 kgf/㎠ by only steam curing at 7days.
      (5) As a result of this study, it was proved that specimens made on type Ⅲ-anhydrite of waste phosphogypsum and flyash increased on the compressive strength of mortar and concrete was as good as concrete with type Ⅱ-anhydrite.
      Consequently, it was proved that a high strength concrete was able to be made with such alternative admixture.

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      목차 (Table of Contents)

      • 목차
      • 제1장 서론 = 1
      • 1.1 연구의 배경 및 목적 = 1
      • 1.2 국내외 연구 동향 = 2
      • 1.2.1 인산석고의 연구동향 = 2
      • 목차
      • 제1장 서론 = 1
      • 1.1 연구의 배경 및 목적 = 1
      • 1.2 국내외 연구 동향 = 2
      • 1.2.1 인산석고의 연구동향 = 2
      • 1.2.2 석고의 연구 동향 = 3
      • 1.3 연구의 내웅 및 범위 = 6
      • 제2장 이론적 고찰 = 9
      • 2,1 시멘트ㆍ콘크리트의 고강도화 = 9
      • 2.1.1 공극의 감소에 의한 콘크리트의 고강도화 = 9
      • 2.1.2 수화생성물량의 증가에 의한 콘크리트의 고강도화 = 10
      • (1) 오토클레이브 양생방법에 의한 수화생성물량의 증가 = 12
      • (2) 상압증기양생에 의한 수화생성물량의 증가 = 14
      • 2.2 시멘트계에서 석고의 반응 메커니즘 = 15
      • 2.2.1 석고의 종류에 따른 특성 = 15
      • (1) 석고의 종류에 따른 특성 = 15
      • (2) 인산석고의 특성 = 17
      • 2.2.2 시멘트계에서 석고계 첨가재에 의한 고강도화 이론 = 19
      • 제3장 폐인산석고를 혼입한 모르타르의 기초 물성 = 21
      • 3.1 실험계획 = 21
      • 3.2 하소 및 분급 조건에 따른 석고의 제조 = 21
      • 3.2.1 개요 = 21
      • 3.2.2 하소 및 분급 조건에 따른 석고의 제조 = 22
      • (1) 물리적 건식 분급에 의한 석고의 정제 = 22
      • (2) 소성온도 변화에 따라 결정형태가 다른 석고 하소 = 24
      • 3.2.3 폐인산석고의 분석 = 24
      • 3.2.4 실험 결과 및 고찰 = 25
      • (1) 분급조건에 따른 폐인산석고의 물리ㆍ화학적 특성 = 25
      • (2) 하소 조건에 따른 폐인산석고의 분석 = 31
      • 3.3 폐인산석고를 혼입한 모르타르의 압축강도 특성 = 33
      • 3.3.1 개요 = 33
      • 3.3.2 실험 방법 = 33
      • (1) 실험 재료 = 33
      • (2) 배합 및 공시체 제작 = 33
      • (3) 양생 방법 = 34
      • (4) 모르타르의 압축강도시험 = 34
      • (5) 내부미세구조 및 수화생성물 관찰 = 35
      • 3.3.3 실험결과 및 고찰 = 35
      • (1) 폐인산석고 혼입을에 따른 강도 특성 = 35
      • (2) 폐인산석고 분급 조건에 따른 강도 특성 = 37
      • (3) 폐인산석고 하소조건에 따른 강도 특성 = 38
      • (4) 양생방법에 따른 강도 특성 = 39
      • (5) 폐인산석고를 혼입한 모르타르의 수화 메커니즘 = 42
      • 3.4 폐인산석고를 혼입한 모르타르의 환경 안정성 평가 = 44
      • 3.4.1 개요 = 44
      • 3.4.2 중금속 용출 실험 = 44
      • (1) 한국의 용출시험방법(Korea Standard Leaching Test : 이하 KSLT) = 44
      • (2) 미국의 중금속 용출시험 방법(Extraction Procedure Toxicity : 이하 EPT) = 45
      • 3.4.3 실험결과 및 고찰 = 45
      • 3.5 폐인산석고를 혼입한 모르타르의 내산성 평가 = 46
      • 3.5.1 개요 = 46
      • 3.5.2 시멘트 모르타르의 내산성 실험 = 47
      • (1) 시험용액의 제조 = 47
      • (2) 모르타르의 중량감소율과 압축강도 시험 = 47
      • 3.5.3 실험결과 및 고찰 = 48
      • 3.6 소결 = 50
      • 제4장 폐인산석고를 이웅한 최적 혼화재 선정과 콘크리트 적용 실험 = 52
      • 4.1 적정 혼화계의 검토 = 52
      • 4.1.1 개요 = 52
      • 4.1.2 실험 방법 = 52
      • (1) 실험 재료 = 52
      • (1) 배합 및 공시체 제작 = 53
      • (2) 양생 방법 = 54
      • (3) 모르타르의 압축강도시험 = 54
      • (4) 내부미세구조 및 수화생성물 관찰 = 54
      • 4.1.3 실험결과 및 고찰 = 55
      • 4.2 콘크리트적용 실험 = 59
      • 4.2.1 개요 = 59
      • 4.2.2 실험 방법 = 59
      • (1) 실험 재료 = 59
      • (2) 콘크리트의 배합 = 59
      • (3) 압축강도시험용 공시체 성형 및 양생방법 = 60
      • (4) 콘크리트의 압축강도시험 = 60
      • 4.2.3 실험결과 및 고찰 = 61
      • 4.3 소결 = 63
      • 제5장 결론 = 64
      • 참고문헌 = 66
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