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

Korea Institute for Structural Maintenance Inspection (한국구조물진단유지관리공학회)
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The Properties of OPC-Slag Cement Mixed with Nano-Silica Solution by Mixing Water Weight Replacement Method

나노실리카 졸을 배합수 중량치환 방법으로 혼합한 OPC-slag cement의 특성

  • Received : 2019.10.15
  • Accepted : 2019.12.05
  • Published : 2020.02.29
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Abstract

This research is a study on the characteristics of OPC-slag cement using nano-silica solution (NSS) with water-weight substitution method. The new replacement method is a fundamental step to study the behavior of cement with higher NSS replacement rates than previous studies. NSS was replaced by 10%, 20%, 30%, 40%, and 50% of the mixing water weight. As a result, the mechanical and microstructural characteristics were improved. This can be summarized in two ways. First, when the NSS is replaced with mixing water, the homogeneous dispersion action of the nano-silica particles is improved. This promotes initial hydration. Second, substitution of NSS with higher density than mixing water reduces w / b. This forms a dense hydration reaction material. The new substitution method did not show any degradation of mechanical and microstructural properties as compared with the results using the powdered nano-silica particles revealed in the previous study. Therefore, it is considered that the method of weight substitution of NSS used in this study can be applied to the formulation of OPC-slag cement.

본 연구는 nano-silica solution(NSS)을 배합수 중량치환방법을 사용한 OPC-slag cement의 특성에 관한 연구이다. 새로운 치환방법은 선행연구들보다 높은 NSS 치환율의 시멘트에 대한 거동을 연구하기 위한 기초 단계이다. NSS는 배합수 중량의 10%, 20%, 30%, 40%, 그리고 50% 치환하였다. 그 결과 역학적 및 미세구조적 특성이 향상되는 결과를 보였다. 이는 두 가지 원인으로 요약된다. 첫 번째는 NSS를 배합수중량 치환하면 나노 실리카 입자의 균질한 분산작용이 향상된다. 이는 초기 수화작용을 촉진한다. 두 번째는 배합수 보다 밀도가 큰 NSS의 치환은 w/b를 감소시킨다. 이는 치밀한 수화반응물질을 형성시킨다. 새로운 치환방법은 선행연구에서 밝혀진 분말형 나노 실리카 입자를 사용한 결과와 비교하여 역학적과 미세구조 특성의 저하가 나타나지 않았다. 따라서 본 연구에서 사용한 NSS를 배합수 중량 치환한 방법은 OPC-GGBFS cement의 배합에 적용 가능할 것으로 판단된다.

Keywords

References

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