Self-sensing performance of the CAC-based MWCNT/NCB composite at high temperatures

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

Construction and Building Materials Pub Date : 2024-11-16 DOI:10.1016/j.conbuildmat.2024.139113

Alamgir Khan , Yingzi Yang , Shafi Ullah , Hassan Bilal , Zhichao Xu , Xiaobing Ma

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引用次数: 0

Abstract

Cement-based smart intrinsic composites incorporating nanocarbon-based fillers are recognized for their self-sensing abilities at ambient temperatures. However, these cement-based composites are susceptible to spalling under high-temperature conditions. Utilizing the spalling resistance of calcium aluminate cement (CAC), this study investigates the mechanical properties and piezoresistive behavior of CAC composites that incorporate multi-walled carbon nanotubes (MWCNT) and nanocarbon black (NCB) under ambient and after exposure to peak temperatures of 200°C, 400°C, and 500°C for 2 hours. The results indicate that a higher MWCNT/NCB content leads to increased compressive strength and reduced electrical resistivity. The piezoresistive performance of the composites exhibited an initial increase across CNB1 (MWCNT/NCB: 0.25/0.20 wt%), CNB2 (MWCNT/NCB: 0.50/0.40 wt%), and CNB3 (MWCNT/NCB: 0.75/0.60 wt%). However, a decline was observed in CNB4 (MWCNT/NCB: 1.0/0.80 wt%). Notably, CNB3, with its optimal concentration, demonstrated a significant enhancement in piezoresistivity, achieving a 44 % fractional change in electrical resistivity (FCR). After exposure to 200°C, the control specimen and CNB1-CNB4 exhibited peak compressive strength due to the additional hydration of anhydrous CAC and silica fume, and CNB3 reached a peak FCR of 49 %. Subsequently, after exposure to 500°C, all mixtures displayed a loss in strength; however, CNB3 and CNB4 exhibited a lower strength loss along with a slight decline in piezoresistive performance. These results highlight the potential application of CAC-based MWCNT/NCB smart intrinsic composites under extreme environmental conditions.

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基于 CAC 的 MWCNT/NCB 复合材料在高温下的自感应性能

含有纳米碳基填料的水泥基智能本征复合材料因其在环境温度下的自感应能力而广受认可。然而，这些水泥基复合材料在高温条件下容易发生剥落。利用铝酸钙水泥（CAC）的抗剥落性，本研究调查了含有多壁碳纳米管（MWCNT）和纳米炭黑（NCB）的 CAC 复合材料在环境温度下以及暴露于 200°C、400°C 和 500°C 的峰值温度 2 小时后的机械性能和压阻行为。结果表明，MWCNT/NCB 含量越高，抗压强度越大，电阻率越小。复合材料的压阻性能在 CNB1（MWCNT/NCB：0.25/0.20 wt%）、CNB2（MWCNT/NCB：0.50/0.40 wt%）和 CNB3（MWCNT/NCB：0.75/0.60 wt%）中表现出最初的上升。然而，CNB4（MWCNT/NCB：1.0/0.80 wt%）则出现了下降。值得注意的是，最佳浓度的 CNB3 显著提高了压阻系数，实现了 44% 的电阻率分数变化（FCR）。暴露于 200°C 高温后，由于无水 CAC 和硅灰的额外水合作用，对照试样和 CNB1-CNB4 显示出峰值抗压强度，CNB3 的峰值 FCR 为 49%。随后，在暴露于 500°C 高温后，所有混合物的强度都有所下降；但 CNB3 和 CNB4 的强度下降较小，压阻性能也略有下降。这些结果凸显了基于 CAC 的 MWCNT/NCB 智能本征复合材料在极端环境条件下的潜在应用。

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.