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Smart Structures and Systems Volume 29, Number 2, February 2022 , pages 351-359 DOI: https://doi.org/10.12989/sss.2022.29.2.351 |
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Synergistic effects of CNT and CB inclusion on the piezoresistive sensing behaviors of cementitious composites blended with fly ash |
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Daeik Jang, H.N. Yoon, Beomjoo Yang, Joonho Seo, Shah Z. Farooq and H.K. Lee
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| Abstract | ||
| The present study investigated the synergistic effects of carbon nanotube (CNT) and carbon black (CB) inclusions on the piezoresistive sensing behaviors of cementitious composites. Four different CNT and CB combinations were considered to form different conductive networks in the binder material composed of Portland cement and fly ash. The cement was substituted with fly ash at levels of 0 or 50% by the mass of binder. The specimens were cured up to 100 days to observe the variations of the electrical characteristics with hydration progress, and the piezoresistive sensing behaviors of the specimens were measured under cyclic loading tests. The fabricated specimens were additionally evaluated with flowability, resistivity and cyclic loading tests, and morphological analysis. The scanning electron microscopy and energy disperse X-ray spectroscopy test results indicated that CNT and CB inclusion induced synergistic formations of electrically conductive networks, which led to an improvement of piezoresistive sensing behaviors. Moreover, the incorporation of fly ash having Fe3+ components decreased the electrical resistivity, improving both the linearity of fractional changes in the electrical resistivity and reproducibility expressed as R2 under cyclic loading conditions. | ||
| Key Words | ||
| Carbon black (CB); Carbon nanotube (CNT); cementitious composites; fly ash; piezoresistive sensing behaviors | ||
| Address | ||
| (1) Daeik Jang, H.N. Yoon, Joonho Seo, Shah Z. Farooq, H.K. Lee: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea; (2) Beomjoo Yang: School of Civil Engineering, Chungbuk National University, 1 Chungdae-ro, Seowon-gu, Cheongju, Chungbuk 28644, Republic of Korea. | ||