Member Size Effect in Seebeck Coefficient of Cement Composites Incorporating Silicon Carbide

Byeong-Hun Woo, Kyu-Tae Park, Kyung-Suk Yoo and Jee-Sang Kim ()
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Byeong-Hun Woo: Civil and Environmental Engineering Department, Hanyang University, Jaesung Civil Engineering Building, 222, Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
Kyu-Tae Park: Construction Site Division of Lotte Engineering & Construction, 29, Jamwon-ro 14-gil, Seocho-gu, Seoul 06515, Republic of Korea
Kyung-Suk Yoo: Civil and Architectural Engineering Department, Seokyeong University, Hanlim Building, 124, Seokyeong-ro, Seongbuik-gu, Seoul 02713, Republic of Korea
Jee-Sang Kim: Civil and Architectural Engineering Department, Seokyeong University, Daeil Building, 124, Seokyeong-ro, Seongbuik-gu, Seoul 02713, Republic of Korea

Clean Technol., 2025, vol. 7, issue 2, 1-15

Abstract: This study investigates the size effect on the Seebeck coefficient (SC) in cement composites incorporating silicon carbide (SiC). Two specimen shapes, cubic (50 × 50 × 50 mm 3 ) and beam (40 × 40 × 160 mm 3 ), were analyzed with varying SiC substitution ratios (0%, 50%, and 100%) for fine aggregates. Thermal and electrical conductivities were measured to assess their influence on the SC. The results showed that a higher SiC content increased porosity, which reduced mechanical strength but significantly improved thermal and electrical conductivities. Thermal conductivity increased from 1.88 W/mK (0% substitution) to 11.89 W/mK (100% substitution), while electrical conductivity showed an improvement from 0.0056 S/m to 0.065 S/m. Cubic specimens exhibited higher SC values compared to beam specimens, with a maximum SC of 1374 μV/K at 100% SiC substitution, attributed to shorter thermal diffusion distances. The findings suggest that optimizing member size and SiC content can significantly improve the thermoelectric performance of cement composites, potentially enhancing energy efficiency in construction applications.

Keywords: Seebeck coefficient; size effect; silicon carbide; mortar; thermoelectric properties (search for similar items in EconPapers)
JEL-codes: Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2025
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