[논문]표면코팅 경량골재의 전기저항 특성

김호진; 김창현; 최정욱; 박선규

doi:10.5345/jkibc.2023.23.6.727

[국내논문] 표면코팅 경량골재의 전기저항 특성
Investigation of Electrical Resistance Properties in Surface-Coated Lightweight Aggregate 원문보기

한국건축시공학회지 = Journal of the Korea Institute of Building Construction, v.23 no.6, 2023년, pp.727 - 738

김호진 (Graduate School, Ritsumeikan University) , 김창현 (Department of Architectural Engineering, Mokwon University) , 최정욱 (Research Center, Korea Concrete Institute) , 박선규 (Department of Architectural Engineering, Mokwon University)

초록
AI-Helper

계면은 콘크리트 강도 결정 요인 중 가장 약한 영역으로, 골재와 시멘트 페이스트 사이에서 형성된다. 경량골재는 원재료를 팽창, 소성시켜 제조하기 때문에 표면에 수많은 공극을 형성하여 밀도가 낮은 장점을 지니지만 골재 강도가 약하다. 콘크리트는 골재강도가 약하면 골재의 파단이 발생한다. 경량골재의 콘크리트 적용은 골재 파단 때문으로 계면의 강도가 중요하다. 본 연구에서는 경량골재의 계면강도 증진을 위해 고로슬래그 미분말로 골재표면을 코팅하고, 시험체의 임피던스를 비교하여 표면개질에 의한 계면 변화를 분석하였다. 실험결과, 경량골재 표면코팅 시 압축강도가 약 4%정도 증가하였고, 강도 증가에 따라 임피던스 값 중 레지스턴스 값이 증가하는 것을 확인하였다.

Abstract ▼ AI-Helper

In concrete, the interface between the aggregate and cement paste is often the most critical factor in determining strength, representing the weakest zone. Lightweight aggregate, produced through expansion and firing of raw materials, features numerous surface pores and benefits from low density; however, its overall aggregate strength is compromised. Within concrete, diminished aggregate strength can lead to aggregate fracture. When applying lightweight aggregate to concrete, the interface strength becomes critical due to the potential for aggregate fracture. This study involved coating the surface of the aggregate with blast furnace slag fine powder to enhance the interfacial strength of lightweight aggregate. The impedance of test specimens was measured to analyze interface changes resulting from this surface modification. Experimental results revealed a 4% increase in compressive strength following the coating of the lightweight aggregate surface, accompanied by an increase in resistance values within the impedance measurements corresponding with strength enhancement.

주제어

표/그림 (15)

표 Table 1. Outline of experimental design
표 Table 2. Physical properties of the binder
표 Table 3. Chemical characteristics of the binder
그림 Figure 1. Electrochemical impedance spectroscopy system
그림 Figure 2. Process for manufacturing electrochemical impedance spectroscopy(EIS) specimens
표 Table 4. Physical properties of the aggregate
그림 Figure 3. Methodology for electrochemical impedance spectroscopy(EIS)
그림 Figure 4. Procedure for coating lightweight aggregate
그림 Figure 5. Compressive strength of cement matrix with 30% water-to-cement ratio by aggregate at 7 days
그림 Figure 6. Scanning electron microscope(SEM) image of F3.5 lightweight aggregate
그림 Figure 7. Scanning electron microscope(SEM) image of F8 lightweight aggregate
그림 Figure 8. Bode plot for cement matrix impedance by aggregate at 7 days
그림 Figure 9. Bode plot for phase angle for cement matrix by aggregate at 7 days
그림 Figure 10. Niquist plot of cement matrix by aggregate type at 7days
그림 Figure 11. Niquist plot of cement matrix with surface-coated aggregate at 7 days

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