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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
The efforts for the economic design of structures has been tried for long time, but the complexity of calculation and the analysis in the process of design were required much time. And so, it has been nearly impossible for designers to design by the more strict optimum method. But, in the early 1950s, many scholars proved that the optimum design problems using plastic theory could be dealt with the linear programming. Later they developed the minimum weight elastic-plastic design of steel structures into repeated trial linear programming. Therefore this paper was tried to help the more rational design of steel structures, comparing the optimum design method using the linear programming with the nonoptimum design (the principle of virtual work) in some structures of steel Rhamen with the various loads.
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.
This study is to investigate the effects of steel fiber and polypropylene fiber on the compressive strength, flexural strength, flexural strength, elasticity modulus and poisson's ratio of concrete. The steel fiber volume contents are 0.00, 0.50, 0.75, 1.00, 1.50% and polypropylene fiber volume contents are 0.00, 0.10, 0.30, 0.50. And also the effects of fiber volume fraction, length and aspect ratio were examined. The conclusions are as follows : 1) Compressive strength is much affected by each fiber contents and its aspect ratio. 2) Flexural strength is increased with the increase of steel fiber contents and affected by aspect ratio. 3) Elasticity modulus is decreased with the increase of contents of each fiber. 4) Poisson's ratio is not affected by the fiber contents, length and aspect ratio.
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.
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.