[논문]전도성 섬유가 함유된 시멘트 모르타르의 미세구조 및 전기적 특성 연구

박종건; 서동주; 임두열; 이유재; 허광희

doi:10.11112/jksmi.2022.26.3.72

전도성 섬유가 함유된 시멘트 모르타르의 미세구조 및 전기적 특성 연구
Study on Microstructure and Electrical Properties of Cement Mortar Containing Conductive Fibers 원문보기

한국구조물진단유지관리공학회 논문집 = Journal of the Korea Institute for Structural Maintenance and Inspection, v.26 no.3, 2022년, pp.72 - 83

박종건 (건양대학교 공공안전연구소) , 서동주 (건양대학교 재난안전공학과) , 임두열 (건양대학교 재난안전공학과) , 이유재 (건양대학교 재난안전공학과) , 허광희 (건양대학교 해외건설플래트학과)

초록
AI-Helper

본 논문에서는 전도성 재료인 탄소섬유(carbon fiber, CF)와 강섬유(steel fiber, SF)를 함유한 시멘트 모르타르의 미세구조 및 전기적 특성, 압축강도에 미치는 영향을 연구하였다. 전도성 섬유보강 시멘트 모르타르(fiber-reinforced cement mortar, FRCM)의 비저항은 4-probe 방법을 이용하여 측정하였고, 압축강도는 압축시험을 기반으로 측정하였다. 이들의 성능은 플레인 모르타르(plain mortar, PM)와 비교, 검토하였다. 게다가 전도성 FRCM 파단면의 표면형상과 구성성분은 주사전자현미경(scanning electron microscope, SEM)과 에너지 분산형 X-ray 분광분석기(energy disperse X-ray spectrometer, EDS)를 이용하여 분석하였다. 그 결과 모든 시편에서 양생재령이 경과됨에 따라 비저항이 점차 증가하는 반면, 섬유혼입률이 증가할수록 비저항은 상당히 감소하였다. 강섬유를 1.25%까지 추가하여도 시멘트 모르타르의 비저항에는 크게 영향을 미치지 않았다. 대조적으로, 탄소섬유는 낮은 함량(즉, 0.1~0.3%)에서도 비저항이 다소 감소하였고, 그 이후에는 현저히 저하되었다. 본 실험에 사용된 CF가 함유된 전도성 CFRCM의 침투 임계점은 0.4%이었고, 압축강도 성능을 유지하면서 전도성 효과를 극대화하는 최적의 탄소섬유 혼입량이라고 판단된다. 전도성 FRCM의 표면형상 및 구성성분 분석을 위해 SEM/EDS를 통해 파단면을 관찰하였다. 이러한 결과는 시멘트 모르타르 내에서 보강섬유의 미세구조 메커니즘을 확립하는 데 매우 유용할 것으로 사료된다.

Abstract ▼ AI-Helper

This paper studied the effect on the microstructure, electrical properties, and compressive strength of cement mortar containing carbon fiber (CF) and steel fiber (SF), which are conductive materials. The resistivity of conductive fiber-reinforced cement mortar (FRCM) was measured using the 4-probe method, and the compressive strength was measured based on the compression test. Their performance was compared and reviewed with plain mortar (PM). Furthermore, the surface shape and composition of the fracture surface of the conductive FRCM were analyzed using a scanning electron microscope (SEM) and an energy disperse X-ray spectrometer (EDS). The results showed that the resistivity gradually increased as the curing time increased in all specimens, whereas the resistivity decreased significantly as the fiber volume fraction increased. Adding steel fibers up to 1.25% did not affect the resistivity of cement mortar considerably. On the contrast, the resistivity of carbon fiber was somewhat decreased even at low contents (ie, 0.1 to 0.3%), and thereafter, it was significantly decreased. The percolation threshold of the conductive CFRCM containing CF used in this experiment was 0.4%, and it is judged to be the optimum carbon fiber dosage to maximize the conductive effect while maintaining the compressive strength performance as much as possible. For the surface shape and composition analysis of conductive FRCM, the fracture surface was observed through SEM-EDS. These results are considered to be very useful in establishing the microstructure mechanism of reinforcing fibers in cement mortars.

주제어

표/그림 (19)

그림 Fig. 1 Typical resistivity range for various materials
그림 Fig. 2 Sketch maps of 2-probe method and 4-probe method in cement composites
그림 Fig. 3 Variation of the resistivity according to the fiber contents
표 Table 1 Physical properties of standard sand
표 Table 3 Properties of CF and SF
표 Table 2 Physical properties of superplasticizer
그림 Fig. 4 SEM observations of the conductive fibers
표 Table 4 Mix proportions of cement mortars
그림 Fig. 5 Fabrication process of cement mortars
그림 Fig. 6 Configuration of copper mesh electrodes
그림 Fig. 7 The resistivity measurement of cement mortar specimen
그림 Fig. 8 Resistivity change of the cement mortar with carbon fiber or steel fiber over curing age
$Fig. 9 Resistivity change of the cement mortar containing carbon fiber or steel fiber with different fiber volume fraction$ 그림 Fig. 9 Resistivity change of the cement mortar containing carbon fiber or steel fiber with different fiber volume fraction
그림 Fig. 10 Variation of resistivity by fiber content in SFRCM and CFRCM
$Fig. 11 SEM images with different fiber volume fractions. (a) Vf=0.1% (b) Vf=0.3% (c) Vf=0.4% (d) Vf=0.6% (e) Vf=0.25% and (f) Vf=1.25%$ 그림 Fig. 11 SEM images with different fiber volume fractions. (a) V_f=0.1% (b) V_f=0.3% (c) V_f=0.4% (d) V_f=0.6% (e) V_f=0.25% and (f) V_f=1.25%
$Fig. 12 EDS analysis results of the CF and SF captured at the fracture surface in CFRCM and SFRCM$ 그림 Fig. 12 EDS analysis results of the CF and SF captured at the fracture surface in CFRCM and SFRCM
표 Table 5 EDS analysis results of cement mortars
그림 Fig. 13 The effect of fiber content on the compressive strength of conductive CFRCM and SFRCM versus PM specimens.
$Fig. 14 Morphology of the fracture surface of the CFRCM specimens$ 그림 Fig. 14 Morphology of the fracture surface of the CFRCM specimens

참고문헌 (22)

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상세보기
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상세보기
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저자의 다른 논문 :

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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