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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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Experimental Study on the Improvement of Workability of Cementitious Composites Using Nano-bubble Water

나노버블수를 활용한 시멘트 복합체의 작업성 증진에 대한 실험적 연구

  • 이난경 (서울대학교 건설환경공학부) ;
  • 강성훈 (서울대학교 건설환경공학부) ;
  • 문주혁 (서울대학교 건설환경공학부)
  • Received : 2021.07.08
  • Accepted : 2021.11.09
  • Published : 2021.12.31
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Abstract

This study was conducted to improve the workability of cementitious composites using nano-bubble water. The used nano-bubble water contains 7% of nano-sized bubbles with an averaged bubble size of 750 nm. Various different types of cementitious composites including ultar-high performance concrete, lightweight cementitious composites, and high-strength mortar have been tested to identify the changes of material properties. From the use of nano-bubble water, it was confirmed that workability has been improved by 3-22%. On the other hand, other material characteristics such as compressive strength did not have noticeable changes. Therefore, it was proposed that the use of nano-bubble water can enhance workability of cementitious composites without having significant impact on other material properties.

본 연구는 시멘트계 건설재료의 작업성 증진을 위하여 나노버블수의 사용을 시도하였다. 사용된 나노버블수는 약 750 nm의 입경을 지닌 나노버블이 7% 포함된 배합수를 사용하였다. 초고성능콘크리트, 경량시멘트 복합체, 고강도 모르타르 등 다양한 시멘트 복합체에 나노버블수가 배합수로서 사용될 때 미치는 영향을 실험하였다. 작업성을 대표할 수 있는 플로우 값이 시편에 따라 3-22%정도 증진됨을 확인하였다. 하지만 압축강도에는 큰 영향을 미치지 않는 것으로 확인되었다. 따라서 재료의 굳은 성질에 큰 영향 없이 시멘트 복합체의 작업성을 증진시킬 수 있는 새로운 방법으로 나노버블수의 사용이 다양한 시멘트 복합체에 활용될 수 있음을 제시하였다.

Keywords

Acknowledgement

본 논문은 국토교통과학기술부(KAIA)의 지원사업에 의해 수행되었습니다. 이에 감사드립니다(21NANO-B156177-02).

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