[논문]그래핀 옥사이드 혼입 고강도 시멘트 모르타르의 Interfacial Transition Zone (ITZ) 특성에 관한 연구

임수민; 조성민; 유준성; 임승민; 배성철

doi:10.14190/jrcr.2022.10.3.343

[국내논문] 그래핀 옥사이드 혼입 고강도 시멘트 모르타르의 Interfacial Transition Zone (ITZ) 특성에 관한 연구
Investigation on the Characteristics of Interfacial Transition Zone (ITZ) of High-Strength Cement Mortar Incorporating Graphene Oxide 원문보기

Journal of the Korean Recycled Construction Resources Institute = 한국건설순환자원학회 논문집, v.10 no.3, 2022년, pp.343 - 350

임수민 (한양대학교 건축공학과) , 조성민 (한양대학교 건축공학과) , 유준성 (한양대학교 건축공학과) , 임승민 (강원대학교 건축학과) , 배성철 (한양대학교 건축공학과)

초록
AI-Helper

최근 취성재료인 콘크리트의 강도 발현에 가장 불리하게 작용하는 영역인 골재와 시멘트 복합체 사이 Interfacial transition zone (ITZ) 성능 개선을 위해 나노 실리카, 탄소나노튜브, 그래핀 옥사이드(GO) 등 나노물질을 활용한 방안이 제시되고 있다. 나노물질 중에서 우수한 분산성을 가진 GO는 ITZ 영역에 높은 비율로 존재하는 Ca²⁺과 화학적 결합을 형성하여 일반강도 콘크리트 내 ITZ 성능 개선에 효과적인 것으로 보고되었다. 본 연구에서 미소수화열 분석 및 Scanning electron microscope 이미지 분석 기법을 활용하여 도출한 GO 혼입에 따른 수화 발열량 변화와 ITZ의 두께 변화 및 표준사 주변 공극 분포 변화를 통해 GO가 고강도 시멘트 모르타르 내 ITZ 특성에 미치는 영향을 조사하였다.

Abstract ▼ AI-Helper

In recent years, nanomaterials, such as nano-silica, carbon nanotubes, and graphene oxide (GO), have been suggested to improve the properties of the interfacial transition zone (ITZ) between aggregates and cement pastes, which has most adversely affected the strength of quasi-brittle concrete. Among the nanomaterials, GO with superior dispersibility has been reported to be effective in improving the properties of ITZ of normal-strength concrete by forming interfacial chemical bonds with Ca2+ ions abundant in ITZ. In this study, the effect of GO on the properties of ITZ in the high-strength mortar was elucidated by calculating the change in hydration heat release, ITZ thickness, and the porosity around ISO sand, which was obtained with isothermal calorimetry tests and scanning electron microscope image analysis, respectively.

Keyword

표/그림 (9)

그림 Fig. 1. UV-vis spectrum of dispersed GO in distilled water
표 Table 1. Mix proportions of mortar
그림 Fig. 2. Experimental schematic of overflow point method: (A) sample polishing, (B) SEM-BSE image, (C) overflow point method
그림 Fig. 3. Isothermal calorimetry results of mortar incorporating 0 wt.% (black-solid line) and 0.1 wt.% (red-dashed line)of GO
그림 Fig. 4. Pores segmentation of specimens from SEM-BSE images at 200 × magnification: (A) cumulative histogram of grayscale, and binarization results of cement mortar incorporating (B) 0 wt.%, (C) 0.1 wt.% of GO
그림 Fig. 5. Pores segmentation of specimens from SEM-BSE images at 1000 × magnification: (A) cumulative histogram of grayscale, and binarization results of cement mortar incorporating (B) 0 wt.%, (C) 0.1 wt.% of GO
그림 Fig. 6. Detectable porosity according to the distance away from the ISO sand surface
그림 Fig. 7. Ca/Si ratio of ITZ around the ISO sand surface in cement mortars containing (A) 0 wt. % and (B) 0.1 wt.% of GO
그림 Fig. 8. Compressive strength and flexural strength of high-strength mortar incorporating 0 wt.% and 0.1 wt.% of GO

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