Journal of the Korea institute for structural maintenance and inspection (한국구조물진단유지관리공학회 논문집)

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Absorption Properties of Coarse Aggregate according to Pressurization for Development of High Fluidity Concrete under High Pressure Pumping

고압송용 고유동콘크리트 개발을 위한 가압에 따른 굵은골재의 흡수 특성

  • Received : 2015.09.02
  • Accepted : 2016.02.26
  • Published : 2016.05.01
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Abstract

In this study, we developed a pressing device which can reproduce the pressure of concrete inside the conveying pipe as a part of the basic study to development of high fluidity concrete under high pressure pumping. Using this pressing device, we evaluated a absorption properties of aggregate that are crushed coarse aggregate, river gravel and lightweight coarse aggregate according to pressure of coarse aggregate and aggregate inside a high fluidity concrete, focused on the reduction of unit water quantity by pressure. In addition, it was evaluated the compressive strength of high fluidity concrete about before and after of pressive. Test a result, case of condition under the high pressure of 250 bar, absorption ratio of crushed coarse aggregate and river gravel were not increased above the surface absorption, absorption ratio of lightweight coarse aggregate was increased than the surface absorption.

본 연구에서는 고압송용 고유동콘크리트 개발을 위한 기초적인 연구의 일환으로 펌프압송시 압송관내 콘크리트가 받는 압력을 재현할 수 있는 가압장치를 개발하였다. 이를 통하여 펌프압송할 경우 발생되는 품질변화의 원인 중 압력에 의한 단위수량 감소에 중점을 두어 가압에 따른 콘크리트용 굵은골재의 흡수 특성 및 고유동콘크리트 내부 굵은골재의 흡수 특성을 평가하였으며, 고유동콘크리트의 가압 전 후 압축강도를 평가하였다. 실험결과, 250 bar의 높은 압력이 작용할 경우 부순굵은골재 및 강자갈의 흡수율은 표건 흡수율 이상으로 증가되지 않는 것으로 나타났으며, 경량굵은골재의 흡수율은 표건 흡수율 이상으로 증가되는 것으로 나타났다.

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References

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