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Alternative Title: A Study on the Experimental of Basic Property of Cement Mortars under Different Types of Binder and Curing Conditions

Abstract: Recently nature sand of good quality that is accomplishing main current until the mid-1980s by fast growth of construction field along with economy development is run dry almost, is real condition that is alternated by crushed sand that is produced in stony mountain.
Concrete structures exposed to sulfate environments are apt to be deteriorated due to sulfate attack. It is, therefore, necessary to establish some plan to restrict the sulfate attack. In the present study, it was investigated the compressive strength and the unit weight change of cement mortars, and microstructure of paste immersed during immersion period in 4types of solution.
As this study is to estimate resistance of cement mortars using crushed sand under chemical attacks. Besides tests have been carried out with cement mortars by river sand and crushed sand by fine sand, cement mortars mix various proportions of silica fume(up to 5% and 15% by weight for cement), fly ash(up to 15% and 50% by weight for cement) and Metakaolin(up to 5% and 15% by weight for cement) were prepared and immersed in pure water, sodium sulfate solution, magnesium sulfate solution, seawater for 28days, 60days, 90days, 180days, 270days, and 365days. Test on the change in the compressive strength and the unit weight of cement mortars according to the duration of immersion time and the content of silica fume, fly ash and Metakaolin was performed.

Keyword: sulfate attack Korean Standard silica fume fly ash Meta kolin unit weight compressive strength chemical attack

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/4053
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001984199

Table Of Contents: 목차 = Ⅰ
표목차 = Ⅲ
그림목차 = Ⅳ
Abstract = Ⅴ
1. 서론 = 1
1.1 연구배경 및 목적 = 1
1.2 연구범위 및 방법 = 2
2. 문헌고찰 = 4
2.1 해수의 작용에 의한 침식 반응 기구 = 4
2.1.1 해수에 의한 콘크리트의 침식작용 = 5
2.1.2 염해에 의한 철근 부식 메커니즘 = 9
2.2 염해 저항성 향상을 위한 콘크리트의 내구성 향상 방안 = 10
2.2.1 내염성 향상을 위한 콘크리트 구성재료의 사용 조건 = 10
2.3 혼화재료 = 20
2.3.1 실리카흄 = 20
2.3.2 플라이애쉬 = 22
2.3.3 메타카올린 = 26
2.3.4 고성능AE감수제 = 29
3. 실험계획 및 방법 = 31
3.1 실험파라미터 = 31
3.2 실험방법 = 32
3.2.1 사용골재의 물성시험 = 32
3.2.2 모르타르의 제작 = 34
3.2.3 시편의 제작 및 양생 = 34
3.2.4 굳지 않은 모르타르 시험 = 35
3.2.5 경화한 모르타르 시험 = 35
3.3 사용재료 = 37
3.3.1 시멘트 = 37
3.3.2 결합재 = 37
3.3.3 골재 = 38
3.3.4 혼화제 = 38
3.3.5 양생수(침적용액) = 38
3.4 시편제작 = 40
4. 실험결과 및 고찰 = 41
4.1 사용골재의 품질 특성 = 41
4.2 굳지 않은 모르타르의 품질 특성 = 42
4.3 외형 변화 특성 = 42
4.4 경화한 모르타르의 특성 = 44
4.4.1 단위중량 = 44
4.4.2 압축강도 = 52
5. 결론 = 58
참고문헌 = 61

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