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소석회를 혼입한 고로슬래그 시멘트 모르타르의 강도 특성
이제방,소양섭 전북대학교 공업기술연구소 1998 工學硏究 Vol.29 No.-
Slags are by-products of the metallurgical industry. The most important slag from the standpoint of the quantity used as building material is iron blastfurnace slag. Slags are either crystalline stable solid used as aggregates or glassy material used as hydraulic binder. Slag cements are low heat of hydration cements. Slags react more slowly with water than portland cement but they can be activated chemically. Activators can be either alkaline activators such as soda, lime, sodium carbonate, sodium silicate or sulphate activators such as calcium sulphate or phosphogypsum. So, in this study slaked lime was used as an activator that the compressive strength of this modified cement(M1 type) is high range in early age. And initial setting time of M1 type cement was shorter than conventional cements.
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.
옵션 선택형 공동주택 입주 전 개조동기 및 유형에 관한 연구
장홍석,이제방,강혜선,유봉호,소승영 청운대학교 건설환경연구소 2011 청운대학교 건설환경연구소 논문집 Vol.6 No.2
This study evaluated that general special quality of resident gives certain influence in reconstruction motive and reconstruction action before occupancy. Investigated reconstruction conduct by scale, reconstruction actual conditions to new apartment house resident. Investigation target is option selection style apartment resident who move into resident less than 1 year. Asked a question about reconstruction motive to select option resident who execute reconstruction more than one. High reconstruction ratio that is about 93% according to result that respond to questionnaire examined. Almost option selection type apartment house do reconstruction action. Also, difference was seen in reconstruction type according to general special quality of resident. 본 연구는 거주자의 일반적 특성(사회인구학적·주거·가족)이 입주 전 개조동기 및 개조행위에 어떤 차이가 있는지 파악하여 거주자의 다양한 욕구를 만족하고 입주 전 개조행위를 줄일 수 있는 거주자의 참여방법, 공동주택 규모별 개조행위 및 개조실태를 조사하고 어떤 차이가 있는지 파악하기 위하여 신규 공동주택 거주자를 대상으로 하여 설문조사를 위주로 실시하였다. 조사대상은 J시의 입주 1년 미만인 옵션 선택형 신규 공동주택 2개 단지로, 옵션을 선택한 가구 중 한 가지 이상 개조를 실시한 가구를 대상으로 개조동기에 대하여 질문하였으며 총 방문세대 180세대 중 설문지에 응한 125세대를 기준으로 개조현황을 파악한 결과 약 93%라는 높은 개조비율을 보였다. 이는 옵션 선택형 공동주택이라 해도 거의 모든 가구에서 개조행위가 이루어지는 것을 나타내며, 거주자의 일반적 특성에 따라 개조유형에 차이를 보였다.
Strength and Microstructure of Reactive Powder Concrete Using Ternary Pozzolanic Materials
소형석,KHULGADAIJANCHIVDORJ,이제방,장홍석,소승영 한국건축시공학회 2013 한국건축시공학회지 Vol.13 No.1
To consider the practicality and economic feasibility of developing reactive powder concrete (RPC), the strength and microstructure properties of RPC using ternary pozzolanic materials (silica fume, blast furnace slag, fly ash) were investigated in this study. Through the investigation, it was found that the compressive strength of RPC using ternary pozzolanic materials was increased significantly compared to that of the original RPC containing silica fume only. A considerable improvement in the flexural strength of RPC using ternary pozzolanic materials was found, and then the utilization of a structural member subjected to bending was expected. The X-ray diffractometer (XRD) analysis and Scanning Electronic Microscope (SEM) revealed that the microstructure of RPC was denser using the ternary pozzolanic materials than the original RPC.