강섬유보강(鋼纖維補强) 표면처리(表面處理) 순환골재(循環骨材)콘크리트의 특성(特性)

배주성,김남욱,Bae, Ju-Seong,Kim, Nam-Wook 한국자원리싸이클링학회 2011 資源 리싸이클링 Vol.20 No.1

The recycled aggregate produced from the waste concrete have the disadvantages in the quality for the natural aggregate. Therefore, in order to reuse the recycled aggregate widely it is a previous subject to improve the quality of recycled aggregate. We deduced the more effective surface treatment method using the colloidal silica solution for quality improvement of recycled aggregate. This study aimed to verify the influences of the deduced surface treatment method and the reinforcement of steel fiber to the properties of concrete. For this object, we inquired into the results of the strengths and the flexural failure tests for the five kinds of concrete specimens. 폐콘크리트로부터 생산되는 순환골재는 천연골재에 비해 품질이 떨어지는 단점이 있어 이를 해결하는 것이 순환골재를 더 많이 재활용하는데 있어서 해결과제라 할 수 있다. 본 연구에서는 선행연구에서 사용된 콜로이달 실리카용액을 이용하여 순환골재의 품질개선에 효과적인 표면처리 방법을 도출하였다. 또한, 본 연구에서는 도출한 표면처리방법과 강섬유보강이 콘크리트의 특성에 미치는 영향을 파악하므로써 순환골재의 더 많은 재활용과 보다 인성적인 콘크리트의 제조를 위하여 5종류의 시험체의 강도 및 휨파괴시험 결과를 비교하여 고찰하였다.

스터럽을 配筋한 鐵筋콘크리트 보의 龜裂에 관한 硏究

배주성,김광렬 전북대학교 공업기술연구소 1985 工學硏究 Vol.16 No.-

잔골재를 동슬래그로 대체한 콘크리트의 특성 연구

배주성,김남욱,고상훈 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 논문집 Vol.11 No.3

최근 들어 정부의 환경정책이 폐기물의 발생량을 줄이되 발생되는 산업부산물을 적극적으로 재활용하는 자원순환형 폐기물 관리로 추진됨에 따라 산업 각 부분에서 발생되는 산업부산물의 재활용에 대한 연구 및 적용성이 활발히 진행되고 있다 최근 잔골재의 대체재로 주목 받고 있는 동슬래그는 본격적인 활용이 진행된다면 잔골재 수급에 많은 도움을 줄 것으로 예상되나 천연골재에 비해 높은 비중 및 대체율이 30%를 초과하면 재료분리가 발생하는 등의 단점 또한 지적되고 있다 본 연구에서는 동슬래그의 혼입 시 발생되는 블리딩의 발생을 혼화제의 사용을 통하여 억제하고 압축강도 시험 결과 등의 종합적인 고찰을 통하여 잔골재 대체시의 동슬래그의 적정 혼입률을 도출하고자 하였다 The recent government policy for environment is pursuing for a circular waste control system not only to reduce waste as much as possible but also to vigorously use the already produced waste Copper slag has a higher fineness modulus and a greater specific gravity than natural aggregate but when the substitutive ratio of fine aggregate is higher than 30%, material segregation occurs by bleeding Thus, in this study, the strength and the physical properties were tested for the specimens manufactured by varying the types of admixtures, and the substitutive ratio of copper slag to suppress material segregation occurring due to the bleeding of concrete using copper slag as the substitutive material of fine aggregate and to find the adequate substitutive ratio of copper slag

비선형 파괴인자에 의한 콘크리트의 파괴거동에 관한 연구

배주성,이준구 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-

Concrete, a mixed material, has heterogenity, anisotrophy and nonlinearity and contains the microcracks and flaws. As these cracks and flaws extent as the load is increased concrete exhibits a nonlinear behavior and finally fractures at the less stress than the design stress, consequently in its fracture analysis, it is more reasonable to evaluate its fracture toughness by applying the concept of fracture mechanics rather than strength concept. In this study, the J-integral and the COD method mainly used in the analysis of nonlinear fracture mechanics, were introduced and three point bending test was carried out for invesgating the effects of the variation of the maximum aggregate size and notch depth on the fracture behavior of concrete.

PEM을 이용한 켄틸레버식 옹벽의 신뢰도 해석

배주성,오병현 전북대학교 공업기술연구소 1994 工學硏究 Vol.25 No.-

The reliability analysis is performed for the stability of cantilever retaining wall using the Point Estimate Method. The measure of the safety of structure is expresed in terms of the probability of failure instead of the conventional factor of safety. The analysis of the uncertainties around input parameter which is involved soil, site and loading condition introduce a measurable uncertainty on the prediction of stability of cantilever retaining wall. The soil properties, concrete unit weight. loads and slope angle of back fill soil are assumed to be probability variables, and considered considered correlations of each variable. Accordingly, the capacity and demand are considered to be normal and beta distribution. And as expected, the difference in the probability of failure of cantilever retaining wall between beta and normal distribution seems to be insignificant for the practical use. If probabilistic analysis techniques are to be adopted, it will be necessary to develop probability based tolerable stability criteria.

SLP法에 依한 Truss構造物의 最適設計에 關한 硏究

裵主星 全北大學校 1978 論文集 Vol.20 No.-

The optimal design of structures is a new field of structural engineering which takes O.R.and system engineering in the design of structures. This study is concerned with the optimal section design of truss structures using the sequential linear programming (SLP) method. In this study the force matrix method was used for the analysis of structures and the weight function of the truss was taken for the objective function. This study was tried to increase the efficiency of calculation in the process of the truss structures design, gaining the optimal solution which is satisfied with the stress and displacement constraint conditional expressions. The results are summarized as follows 1) The stress constraint was within the range of safty. 2) When the initial value was taken by the usual design method the analysis of turss structures was efficient. 3) Comparing with the usual design method, the section of truss structures was determined briefly.

섬유망을 이용한 RC슬래브의 균열제어

배주성,김경수,김남욱,김철민 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 논문집 Vol.6 No.2

鐵筋콘크리트 직사각형보의 剪斷强度에 關한 硏究

裵主星,李鏞雨 전북대학교 공업기술연구소 1986 工學硏究 Vol.17 No.-

In this study, 20 reinforced concrete beam specimens were made with the changes of variables respectively, which are the main reinforcement ratio, existence and spacing of the shear reinforcement. And then, they were tested to examine the effects of the changes of the described variables on the shear strength. The result are as folllows : 1. The ultimate shear strength was higher than the shear cracking strength by about 32.8%. 2. For the shear strength of the beams, the influence of the main reinforcement ratio and the shear span-depth ratio (a/d) were higher than that of the concrete compressive strength. 3. In this study, equations of the shear cracking strength and the ultimate shear strength were derived and the, the values by those equations were nearly in accordance with those of the test. 4. In the shear cracking strength, the derived equation was relatively agreed with the Placas and Regan's equation. 5. In the examination of the influence of main reinforcement ratio on the ultimate shear strength, as the main reinforcement ratio was increased by 1.0% the ultimate shear strength was increased about 0.73%.

「굵은 골재의 크기가 콘크리트의 파괴거동에 미치는 영향」

배주성 전북대학교 공업기술연구소 1989 工學硏究 Vol.20 No.-

Concrete is a mixed meterial which is composed of cement, fine aggregate, coarse aggregate and water etc.. Therefore it contains the micro -cracks and bond cracks at the aggregate-cement paste interface. As these cracks extent as the load is increased concrete exhibits a nonlinear load-deflection behaviour and finally fractures at the less stress than the design stress. In this viewpoint it is reasonable to apply the fracture mechanics concepts to the fracture analysis of concrete, and the size of coarse aggregate play an important role in the fracture behaviour of concrete. In order to investigate this study a series of concrete and mortar beams are made, which have the same dimension and notch but have the different maximum size of coarse aggregate. Also the J-integral values, COD and compliance are chosen as the fracture toughness parameters.

平板과 플래트 스래브 限界狀態設計에 關한 硏究

裵主星 전북대학교 공업기술연구소 1983 工學硏究 Vol.14 No.-

In the limit states design method proposed in this paper, in addition to choosing thicknesses of slbas from code provisions, long term deflection is calculated. To keep crack widths within desirable limits, the size reinforcing bar is selected from a crack control of criterion. The design of slabs for strength is carried out using the yield-line method and the conventional punching shear formula. A numerical example is included to illustrate this limit states design method.