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<p>Against global resource scarcity, this study explores construction waste recycling by preparing recycled cement–carbon nanotube composites (RCCMs) using recycled concrete powder (RCP), CNTs, sand, and cement. It analyzes how RCP (10–20 wt%) and CNTs (0.3–0.9 wt%) contents affect RCCMs’ electromagnetic wave (EMW) absorption and compressive strength, via XRD, SEM, vector network analyzer (2–18&#xa0;GHz) and compressive strength tests. The results show that RCP and CNTs contents barely affect RCCMs’ phase composition but significantly impact the morphology, EMW absorption, and compressive strength. With the increase of RCP and CNT content, the internal defects of RCCM increase, the electromagnetic wave absorption capacity increases, and the compressive strength decreases. The minimum reflection loss (RL) and effective absorption bandwidth (EAB) of the RCCM with 10 wt% RCP and 0.6 wt% CNT are –&#xa0;33.01&#xa0;dB and 6.82&#xa0;GHz, which are 1.53 and 2.2 times higher than those of the control group, respectively. The compressive strength reaches 93.72% of the control group. In this study, a method of high-performance recycled cement mortar is proposed for the research of resource utilization of construction solid waste.</p>

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Effects of Recycled Micro-Powder and CNTs on Compressive Strength and Electromagnetic Wave Absorption Properties of Cement Mortar

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Tiejun Zhao,
  • Yuqi Liu,
  • Tingting Zhang,
  • Haoyang Li,
  • Linjie Tian,
  • Zhihui Li

摘要

Against global resource scarcity, this study explores construction waste recycling by preparing recycled cement–carbon nanotube composites (RCCMs) using recycled concrete powder (RCP), CNTs, sand, and cement. It analyzes how RCP (10–20 wt%) and CNTs (0.3–0.9 wt%) contents affect RCCMs’ electromagnetic wave (EMW) absorption and compressive strength, via XRD, SEM, vector network analyzer (2–18 GHz) and compressive strength tests. The results show that RCP and CNTs contents barely affect RCCMs’ phase composition but significantly impact the morphology, EMW absorption, and compressive strength. With the increase of RCP and CNT content, the internal defects of RCCM increase, the electromagnetic wave absorption capacity increases, and the compressive strength decreases. The minimum reflection loss (RL) and effective absorption bandwidth (EAB) of the RCCM with 10 wt% RCP and 0.6 wt% CNT are – 33.01 dB and 6.82 GHz, which are 1.53 and 2.2 times higher than those of the control group, respectively. The compressive strength reaches 93.72% of the control group. In this study, a method of high-performance recycled cement mortar is proposed for the research of resource utilization of construction solid waste.