Improving the electrothermal properties of carbon fibre-geopolymer by high-temperature treatment

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-06-14 DOI:10.1016/j.conbuildmat.2025.142114

Yajun Zhang, Xinyu Du, Yong Wang, Yuhui Yuan, Da Yu, Fei Teng, Shanshan Wang, Weixin Liu

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引用次数: 0

Abstract

In contrast to increasing conductive fillers, this paper proposed a new treatment method to improve the electrothermal properties of carbon fibre-geopolymer (CG) by high-temperature treatment. The effects of carbon fibre content (0–2.0 wt%) and applied voltage (9–20 V) on the electrothermal properties of CG before and after 400 ℃ were investigated. The electrical conductivity, microstructure and compressive strength were also tested. Compared to the untreated CG2.0, CG2.0 after high-temperature treatment exhibited a 78 % reduction in impedance modulus and a 59 % decrease in DC resistance. The electrothermal temperature increased by more than 50 % and remained stable over multiple cycles, reaching a maximum temperature of 350 °C. Electrothermal temperature prediction model for carbon fibre-geopolymer after high-temperature treatment was established and the theoretical results agreed well with the experimental results. This paper also proposed an explanation for the improvement mechanism of the electrothermal properties of geopolymer with high carbon fibre content, namely that the shrinkage of the gel due to the high-temperature treatment created more conductive pathways for the carbon fibre. Due to its high electrothermal temperature and excellent cyclic stability, carbon fibre-geopolymer after high-temperature treatment has potential applications in smart infrastructure, such as road de-icing and building temperature control.

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高温处理提高碳纤维地聚合物的电热性能

在增加导电填料的基础上，提出了一种通过高温处理提高碳纤维地聚合物（CG）电热性能的新方法。考察了400℃前后碳纤维含量（0 ~ 2.0 wt%）和施加电压（9 ~ 20 V）对CG电热性能的影响。并对其电导率、显微组织和抗压强度进行了测试。与未处理的CG2.0相比，高温处理后的CG2.0的阻抗模量降低了78 %，直流电阻降低了59 %。电热温度提高了50% %以上，并在多次循环中保持稳定，最高温度达到350℃。建立了碳纤维地聚合物高温处理后的电热温度预测模型，理论结果与实验结果吻合较好。本文还对高碳纤维含量地聚合物的电热性能改善机理提出了解释，即凝胶因高温处理而收缩，为碳纤维创造了更多的导电路径。高温处理后的碳纤维地聚合物具有较高的电热温度和优良的循环稳定性，在道路除冰、建筑温度控制等智能基础设施领域具有潜在的应用前景。

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

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.