• Title/Summary/Keyword: 재생자원

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An Experimental Study to Determine the Mechanical Properties of Recycled Aggregate Separated from Demolished Concrete and Recycled Aggregate Concrete (폐 콘크리트에서 분리된 재생골재와 재생콘크리트의 공학적 특성규명을 위한 실험적 연구)

  • 전쌍순;이효민;황진연;진치섭;박현재
    • The Journal of Engineering Geology
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    • v.13 no.3
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    • pp.345-358
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    • 2003

  • Recently, the reuse of coarse aggregate derived from demolished concrete was introduced into practice with two environmental aspects: protection of natural sources of aggregate and recycling of construction waste. However, recycled aggregate has been used for the very limited application such as subbase material for pavement and constructional filling material because it was considered as low quality constructional materials. In the present study, in order to examine the possibility that recycled aggregate can be used for concrete mixing, we conducted various experimental tests to identify mineralogical, chemical and mechanical properties of recycled aggregate and to determine the workability and mechanical properties of recycled aggregate concrete (RAC). The cement paste and mortar contained in recycled aggregate significantly affect the basic mechanical properties of aggregate and the workability and mechanical properties of RAC. However, RCA mixed with the proper replacement ratio of recycled aggregate shows the comparable compressive strength and freeze and thaw resistance to those of normal concrete. Therefore, it is considered that recycled aggregate can be widely used for concrete if the cement paste and mortar can be efficiently removed from recycled aggregate and/or if the effective replacement ratios of recycled aggregate are applied for mixing concrete.

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A Study on the recognitions and effects of Urban Regeneration factors -focused on Busan's village activist trainees- (도시재생 전략요인에 관한 인식과 영향 연구 -부산시 마을활동가 교육생을 대상으로-)

  • Park, Hee-Jung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.10
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    • pp.7006-7012
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    • 2015

  • Urban regeneration can be an effective tool to promote sustainability and enhance quality of village. Urban regeneration can be considered to be the process of reversing economic, social and physical decay having reached the point where market forces alone will not suffice. For this study, 154 village activist trainees are surveyed. Using the survey results, factor analysis, multi-regression analysis is conducted to identify the factor's significance and to find improvement properties by composing the significance and the satisfaction level. The purpose of this study is to suggest strategy of urban regeneration through the effect of urban regeneration factor on recognition and satisfaction. The findings show that environmental regeneration factor is more influential than economic, social and cultural factors on recognition and satisfaction. This study provide a convenient set of indicators for strategic focus to help urban regeneration policy.

  • https://doi.org/10.5762/KAIS.2015.16.10.7006 인용 PDF KSCI