Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Experimental Study on the Material Properties of High Strength Concrete with Hollow Glass Powder

유공유리분말 혼입 고강도 콘크리트의 물성에 관한 실험적 연구

  • Received : 2020.06.05
  • Accepted : 2020.07.23
  • Published : 2020.08.20
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Abstract

In this study, in order to confirm the applicability of Hollow Glass Powder(HGP) in 70MPa-class high strength concrete, the fresh and hardened states were examined according to the amount of HGP, and the results are as follows. The flow characteristics showed that the slump flow increased slightly as the amount of HGP was increased, and the T500 was slightly shortened as the amount of HGP was increased, and the rebar passing ability was improved due to the ball bearing effect of HGP. In particular, it showed the best rebar passing ability at a usage of 1.0kg/㎥. The use of HGP 1.0kg/㎥ resulted in a 40% reduction in plastic viscosity, but the viscosity increased at 2.0kg/㎥. Through experiments, it was confirmed that HGP was helpful in improving the workability of high-strength concrete, and the usage of 1.0kg/㎥ is considered to be the most appropriate. It was confirmed that HGP does not affect concrete compressive strength.

본 연구에서는 70MPa급 고강도 콘크리트에서 유공유리분말(HGP)의 적용성을 확인하기 위하여 HGP 사용량에 따라서 프레쉬 상태와 경화 상태의 물성을 검토하였고, 그 실험결과는 다음과 같다. 유동 특성은 HGP의 사용량이 증가할수록 슬럼프플로가 약간 증가하는 하는 것으로 나타났고 T500은 HGP의 사용량이 증가할수록 약간 단축되었으며, 철근 통과성은 HGP의 볼베어링 효과로 인해 개선되는 것으로 나타났다. 특히 사용량 1.0kg/㎥에서 통과성 0등급으로 가장 양호한 철근통과성을 발휘하였다. 레올로지 특성으로는 HGP 1.0kg/㎥에서 소성점도가 Plain 대비 40% 정도 감소하여 HGP가 고강도 콘크리트의 소성점도를 낮추는 효과가 있는 것으로 확인되었다. 하지만 HGP 2.0kg/㎥에서는 1.0kg/㎥보다 오히려 소성점도가 크게 나타났다. 실험을 통하여 HGP가 고강도 콘크리트의 작업성 향상에 도움이 되는 것을 확인할 수 있었으며 사용량 1.0kg/㎥ 이 가장 적절한 것으로 판단된다. 또한 HGP가 콘크리트 압축강도에 영향을 미치지 않는 것으로 확인되었다.

Keywords

References

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