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나노실리카 졸을 배합수 중량치환 방법으로 혼합한 OPC-slag cement의 특성

The Properties of OPC-Slag Cement Mixed with Nano-Silica Solution by Mixing Water Weight Replacement Method

김태완|김성도|서기영
한국구조물진단유지관리공학회 (The Korea Institute For Structural Maintenance and Inspection)|2020.02|한국구조물진단유지관리공학회 논문집 (Journal of The Korea Institute for Structural Maintenance and Inspection)|제24권 제1호|pp. 24-34

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키워드

mixing method나노실리카 솔루션배합방법배합수 중량치환nano-silica solutionweight-replacement of mixing water
주제분류안전공학

초록

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 방법은OPC-GGBFS cement의 배합에 적용 가능할 것으로 판단된다.

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. NSSwas replaced by 10%, 20%, 30%, 40%, and 50% of the mixing water weight. As a result, the mechanical and microstructural characteristics wereimproved. This can be summarized in two ways. First, when the NSS is replaced with mixing water, the homogeneous dispersion action of the nano-silicaparticles is improved. This promotes initial hydration. Second, substitution of NSS with higher density than mixing water reduces w / b. This formsa dense hydration reaction material. The new substitution method did not show any degradation of mechanical and microstructural properties ascompared with the results using the powdered nano-silica particles revealed in the previous study. Therefore, it is considered that the method of weightsubstitution of NSS used in this study can be applied to the formulation of OPC-slag cement.

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