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| 多壁碳纳米管增强磁铁矿砂超高性能混凝土的导电、温敏与抗压性能研究 |
| Study on the Electrical Conductivity, Temperature Sensitivity and Compressive Strength of Multi-walled Carbon Nanotube-reinforced Magnetite Sand Ultra-high Performance Concrete |
| 投稿时间：2025-09-22 |
| DOI：10.16018/j.cnki.cn32-1650/n.202602001 |
| 中文关键词: 超高性能混凝土 磁铁矿砂 多壁碳纳米管 温敏特性 电阻率 |
| 英文关键词: ultra-high performance concrete magnetite sand multi-walled carbon nanotubes temperature sensitivity electrical resistivity |
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| 摘要点击次数: 3 |
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| 中文摘要: |
| 本文通过对比试验,研究了磁铁矿砂部分替换天然河砂制备超高性能混凝土(UHPC)的性能;在此基础上,再复掺多壁碳纳米管(MWCNTs),分析其掺量对UHPC的导电、温敏与力学性能的影响。结果表明,磁铁矿砂的加入使得UHPC的抗压强度略有降低;UHPC的电阻率随磁铁矿砂的替换比例增加而降低;复掺25%磁铁矿砂与0.15%MWCNTs时,试件28 d电阻率降低34.94%。温敏方面,掺磁铁矿砂的UHPC电阻率随温度升高而降低,各组试件在10~30 ℃温区内降幅超73%,表现出良好的温敏特性;复掺MWCNTs可进一步降低UHPC的电阻率,并优化其宽温域稳定性,其中复掺0.1%MWCNTs的UHPC在25~130 ℃兼具最优的宽温域温敏特性与最高的抗压强度(149.5 MPa)。 |
| 英文摘要: |
| This paper experimentally investigated the effects of partial replacement of river sand with magnetite sand on ultra-high performance concrete, followed by the incorporation of multi-walled carbon nanotubes (MWCNTs) on the electrical conductivity, temperature sensitivity, and compressive strength of ultra-high performance concrete (UHPC). The results showed that magnetite sand slightly reduced compressive strength but decreased electrical resistivity with increasing replacement ratio. The UHPC incorporating 25% magnetite sand and 0.15% MWCNTs reduced the 28 d resistivity by 34.94%. Regarding temperature sensitivity, the resistivity of magnetite sand-modified UHPC decreased with rising temperature, with a reduction in resistivity exceeding 73% for all groups in the range of 10~30 ℃, indicating good temperature sensitivity. The addition of MWCNTs further reduced resistivity and improved wide-temperature-range stability. Notably, UHPC with 0.1% MWCNTs exhibited both the optimal temperature sensitivity in the range of 25~130 ℃ range and the highest compressive strength (149.5 MPa). |
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