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<p>This study prepared a composite cementitious material with excellent comprehensive performance by combining alkali-activated steel slag with foam concrete. The effects of water-cement ratio, steel slag substitution rate, alkali equivalent content, water glass modulus, and carbon fiber content on foam concrete's compressive strength, water absorption, thermal resistance, and electrical conductivity were investigated by orthogonal tests. The results showed that water glass modulus was the main factor affecting foam concrete's 28-day compressive strength and water absorption. Steel slag substitution rate significantly affected thermal resistance, while carbon fiber was the main factor affecting electrical conductivity. In terms of electromagnetic properties, the impedance match of the composites was &gt; 0.8 significant with a percentage of 15.21%, which was 49.41% higher than that of 10.18% for ordinary foam concrete, and the minimum reflection loss was − 30.02 dB, which was significantly better than that of ordinary foam concrete (− 9.139 dB).</p>

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Multifunctional Composite: Enhancing Mechanical Properties and Electromagnetic Wave Absorption Performance of Alkali-Activated Steel Slag Foam Concrete

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Ying-hua Bai,
  • Yong-jie Chen,
  • Yu Chen

摘要

This study prepared a composite cementitious material with excellent comprehensive performance by combining alkali-activated steel slag with foam concrete. The effects of water-cement ratio, steel slag substitution rate, alkali equivalent content, water glass modulus, and carbon fiber content on foam concrete's compressive strength, water absorption, thermal resistance, and electrical conductivity were investigated by orthogonal tests. The results showed that water glass modulus was the main factor affecting foam concrete's 28-day compressive strength and water absorption. Steel slag substitution rate significantly affected thermal resistance, while carbon fiber was the main factor affecting electrical conductivity. In terms of electromagnetic properties, the impedance match of the composites was > 0.8 significant with a percentage of 15.21%, which was 49.41% higher than that of 10.18% for ordinary foam concrete, and the minimum reflection loss was − 30.02 dB, which was significantly better than that of ordinary foam concrete (− 9.139 dB).