Comparison of thermal conductivity and electrical resistivity of carbon-based cementitious composites

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2023-10-13 DOI:10.1680/jmacr.22.00358

Fatih Acikök, Ahmet Genç, Oğuzhan Şahin, İsmail Raci Bayer, Mehmet Kemal Ardoğa, Mustafa Şahmaran

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Abstract

In this study, it was aimed to produce the multifunctional cementitious composites with advanced thermal and electrical performance considering that these composites having high conductivity serve for the purpose of de-icing, electromagnetic shielding, anti-static, anti-corrosion, and so on. Carbon fiber (CF), and carbon powder (CP) were used singly or together to develop cementitious composites having high conductivity. The electrical resistance and thermal conductivity tests were performed to measure the conductivity of the cementitious composites. While mini-spreading test was applied to assess the consistency of the fresh-state cementitious composites containing conductive materials, in order to determine the distribution of the conductive material incorporated, SEM images were analyzed. In addition, compressive strength tests were carried out to determine the mechanical properties. According to the test results, the highest electrical conductivity result (197 Ω on the 1 st day) were obtained from the binary mixtures, while the highest thermal conductivity result (1250 mW/m.K on the 7 st day) were obtained from the mixtures containing only CP (by volume %0.6). 0.5% carbon fiber by volume mixture performed the worst in terms of mechanical and workability, with 20.5 MPa lower compressive strength and 16 cm lower mini-spread diameter values when compared to the control mixture.

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碳基胶凝复合材料的导热率和电阻率比较

在本研究中，考虑到这些复合材料具有高导电性，可用于除冰、电磁屏蔽、防静电、防腐等目的，旨在生产具有先进热电性能的多功能胶凝复合材料。采用碳纤维(CF)和碳粉(CP)单独或共同制备了高导电性的胶凝复合材料。通过电阻测试和导热测试来测量胶凝复合材料的导电性能。采用微扩散试验来评估含导电材料的新鲜状态胶凝复合材料的一致性，为了确定所含导电材料的分布，分析了SEM图像。此外，还进行了抗压强度试验，以确定其力学性能。试验结果表明，二元混合物第1天电导率最高(197 Ω)，导热系数最高(1250 mW/m)。仅含CP(体积%0.6)的混合物中获得了第7天的K。0.5%体积碳纤维混合料的力学性能和和易性最差，与对照混合料相比，抗压强度降低20.5 MPa，微展径值降低16 cm。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.