현장시험을 통한 Carbon fiber heating wire의 콘크리트슬래브 열전달 효과

Field Test to Investigate Heat Transferring Effect of Carbon Fiber Heating Wire on the Concrete Slab

Abstract

기존 도로면 결빙방지기술은 염화물로 인한 도로파손 및 환경적인 문제점들 해결하기 위해 탄소섬유발열체를 콘크리트 슬래브에 'ㄷ'자 모양으로 삽입하여 현장시험을 수행하였다. iButton을 이용하여 중첩효과를 기대할 수 있는 구간과 그렇지 않은 구간에 대하여 12시간 발열하는 동안 온도를 측정하였다. 시험결과 중첩효과가 있는 구간에는 영상의 온도를 보였으며, 그렇지 않은 구간은 영상의 온도는 아니지만 콘크리트 표면 온도의 상승을 보였다. 따라서 CFHW는 발열체로 충분히 결빙방지 재료로 사용가능 함을 시험을 통해 검증하였다.

Field tests with carbon fiber heating wire (CFHW) embedded inside concrete slab were performed to present the alternative heating material capable of avoid the adverse effects of traditional de-freezing salt on the structures and environment. The CFHW was inserted into the concrete slab in the shape of 'ㄷ' to improve the heat superposition and the temperature on the surface was measured using iButton. The results showed that the temperature where the CFHW's were faced with each other increased to above zero after 12-hour at outdoor air temperature of $-6^{\circ}C$. Comparatively, the temperature slightly increased where the CFHW was embedded on one side because the heat was not superimposed. Hence, it can be said that the CFHW is a suitable heating material to prevent the concrete road from being frozen.

Fig. 1. Results of laboratory test (Kim & Ban, 2017)

Fig. 2. Results of simulation (Kim & Ban, 2019)

Fig. 3. Results of numerical analysis (Kim & Ban, 2019)

Fig. 4. Field test

Fig. 5. Results of field test for Line.1

Fig. 6. Results of field test (Line.2)

Fig. 7. Results of field test (Line.3)

Table 1. Specific features of the iButton