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소승영 전남도립대학교 1999 전남도립대학교 논문집 Vol.S No.-
Concrete is intrinsically protective against corrosion of embedded steel because it comprises a highly alkaline aqueous phase(pH=13.5) contained in a continuous network of pores of varying shapes and sizes within solid cement hydration products. But, if chloride ions exist in the vicinity of the steel, introduced into the concrete through mix ingredients such as unwashed chloride-contaminated coastal sands used as fine aggregates and enter concrete from outside sources during the service life of structures, the steel will show pitting corrosion even though the pH of the environment is higher than 11.0. Carbonation of cover concrete is considered one of the most common culprits in the corrosion of steel in concrete. It breaks down the passive film and allows the steel to corrode actively at a high rate. The main objective of this study is to investigate the interrelationship between chloride contents and speed of carbonation by conducting an accelerated carbonation test on mortar which chlorides were mixed. It was found that chloride-bearing mortar were accelerated carbonation and the Friedel’s salt were broken down in carbonation.
무기계 산업폐기물을 활용한 비소성 시멘트의 제조시 품질 안정성 확보를 위한 화학성분 계수의 활용성
소승영,문경주,형원길,주홍신,박원춘,소양섭 한국폐기물자원순환학회 2008 한국폐기물자원순환학회지 Vol.25 No.7
This study aims to manufacture non-sintering cement (NSC) by adding phosphogypsum (PG) and waste lime (WL) to granulated blast furnace slag (GBFS) as sulfate and alkali activators. This study also investigates the applicability of oxide componential coefficient for quality safety by chemical analyses in manufacturing of non-sintering cement according to various mixing ratio. Results obtained from this study have shown that the hydraulic modulus, lime saturation degree, CaO/SiO₂, and (CaO + Al₂O₃ + SO₃)/SiO₂could be used for quality safety of non-sintering cement.
시멘트의 C3A함유량에 따른 모르타르의 염화물 침투 저항성에 관한 연구
소승영 전남도립대학교 2000 전남도립대학교 논문집 Vol.2 No.-
The usual chloride-free environment of uncarbonated concrete is intrinsicaIlv protective against corrosion of embedded steel because it comprises a highly alkaline aqueous phase(pH=13.5) contained in a continuous network of pores of varying shapes and sizes within solid cement hydration products. Nevertheless, if chloride ions exist in the vicinity of the steel, the steel will show pitting corrosion even though the pH of the environment is higher than 11.0. Chloride salts are introduced into the concrete through mix ingredients, such as unwashed chloride-contaminated coastal sands used as fine aggregates and enter concrete from outside sources during the service life of structures. The appropriate parameter of concern in chloride-induced steel corrosion is part of the dissolvable chloride concentration. The main objective of this study is to quantify the depth and amount of chloride ion intrusion in mortars made with cements of different C3A contents, such as those in seawater. It was found that the depth of intrusion and amount of chloride ion in mortars decreases with an increase C3A contents.
고로슬래그 첨가 시멘트 페이스트 내 염화물 이온의 거동
소승영,이제방 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
The main objective of this study is to determine the critical chloride ion concentrations in the pore solutions causing depassivation of steel reinforcement in concrete made with various proportions of blast Furnande slag and sodium chloride contents. Cement pastes with water-ratio of 0.5 and the pastes were allowed to hydrate in sealed containers for 28days and then objected to pore solution expression. The expressed pore fluids were analyzed for chloride and hydroxyl ion concentrations. The result indicate that partial replacement of portland cement by blast furnace slag has negligible influnce on the chloride binding in the cement pastes.
소승영,박홍신,소양섭 한국콘크리트학회 1995 콘크리트학회지 Vol.7 No.1
본 연구는 시멘트 경화체 중의 Cl 고정화 메카니즘을 규명하는 연구의 일환으로 시멘트의 C3A 함유량에 따른 Cl 고정화 효과를 세공용액 분석방법에 의해 조사한 것으로 C3A함유량 0.46 9.65%의 4가지 시멘트와 C3A를 함유하지 않은 초속경 시멘트 페이스트를 밀봉용기내에서 양생시켜 재령 28일에 세공용액을 추출하여 세공용액 중의 Cl 과 OH 농도를 측정, C3A함유량이 Cl 고정화에 미치는 영향을 검토한 것이다. 연구결과 세공용액 중의 Cl 농도는 NaCl 혼입량에 관계없이 시멘트 중의 C3A량이 증가함에 따라 낮아져 시멘트 경화체 내에서 Cl 의 고정화에 C3A가 매우 효과적임을 알 수 있었다. 세공용액의 Cl /OH 는 Cl 혼입량이 시멘트 중량의 0.3%인 경우 강재부동태막을 파괴하는 0.3보다 낮았으며 X선회절분석에 의해 C3A에 의한 고정화 메카니즘은 프리델씨염(Friedel's salt)의 생성에 의함을 확인하였다.
소승영 전남도립대학교 2000 전남도립대학교 논문집 Vol.3 No.-
Corrosion of steel reinforcement is the most significant factor of deterioration in reinforced. concrete structures. Chloride ion is considered one of the most common culprits in the corrosion of steel in concrete. It breaks down the passive film and allows the steel to corrode actively at a high rate. The main objective of this study is to determine the critical chloride ion concentrations in the pore solutions and chloride binding effect of cement pastes made with and without fly ash, silica fume and blast furnace slag. Cement pastes with water-ratio of 0.5, allowed to hydrate in sealed containers for 28 days and to express pore solution. The expressed pore fluids were analyzed for chloride and hydroxyl ion concentrations. It was found that the replaced cement with fly ash has little effect on chloride binding and replaced. cement with blast furnace slag has negligible influence on the chloride binding in the cement pastes. And chloride binding capacity decreases significantly with an increase in the silica fume replacement ratio.
경량골재를 사용한 콘크리트 복합체의 단열성능에 관한 연구
소승영 한국건축시공학회 2004 한국건축시공학회지 Vol.4 No.3
In recent years, it has widely been studied on the light-weight composites for the purpose of the large space and thermal insulation of building structures. The purpose of this study is to evaluate the properties of light-weight composites made by binders as cement, resin and polymer cement slurry. The concrete composites are prepared with various conditions such as polymer-cement ratio, void-filling ratio, type of resin, filler content and light-weight aggregate content, tested for thermal conductivity. From the test results, the thermal conductivity of concrete composites with the binder of cement tends to decrease with increasing polymer-cement ratio, and to increase with increasing void-filling ratio. The thermal conductivity of concrete composites with the binder of resin are markedly affected by the light-weight aggregate content, type of resin and filler content. The composites made by polymer-modified concrete and polymer cement slurry have a good thermal insulation property. From the this study, we can recommend the proper mix proportions for thermal insulation panel or concrete. Expecially, the thermal conductivity of concrete composites made by polyurethane resin is almost the same as that of the conventional expanded polystyrene resin.