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碳纳米纤维掺杂高性能混凝土修复材料力学性能及抗冻性研究
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U416

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国家重点研发计划项目(2021YFB2600500); 国家自然科学基金青年项目(52208512)


A Study of Mechanical Properties and Frost Resistance of High-Performance Concrete Repair Materials Doped with Carbon Nano-Fiber
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    摘要:

    介绍了一种高性能混凝土(UHPC)掺杂气相生长碳纳米纤维增强体(VGCF)和碳纳米管(CNT)的跑道修复材料。已有大量研究证明在混凝土中添加纳米纤维可以提高其力学性能以及耐久性。着重对修复材料与水泥基道面材料的适应性进行研究,同时对碳纳米纤维材料对混凝土增强微观机理的影响进行分析。通过在混凝土中掺杂不同质量分数的碳纳米纤维进行配合比试验,测定了抗压强度、粘结强度和冻融循环下的质量损失率及粘结强度损失率。研究表明,当CNT104掺量为0.1%时,混凝土的抗压强度和粘结强度分别为60.6 MPa和11.3 MPa,150次冻融循环质量损失最小。当CNT107掺量为0.15%时,表现出较好的抗压强度和粘结强度,分别为59.1 MPa和11.5 MPa,当掺量达到0.2%时在150次冻融循环下质量损失最小。VGCF掺量为0.15%时混凝土达到最大抗压强度和粘结强度,分别为68.0 MPa和18.6 MPa,同时添加不同含量VGCF的混凝土均表现出更好的抗冻性能,在含量为0.15%时,经冻融循环后混凝土的质量损失率最低。在150次冻融循环后再次测得粘结强度,通过冻融前后对比得到掺入0.15%的VGCF粘结强度下降率为32.79%,是所有组中最低。结果表明,在使用掺入0.15%VGCF的UHPC作为跑道修复材料时,其与水泥基道面材料表现出良好的适应性。

    Abstract:

    This article introduces a repair material being characteristic of high-performance concrete doped with vapor grown carbon nano-fiber reinforcement (VGCF) and carbon nano-tubes (CNT) for runway. That material of adding nano-fibers to concrete can improve its mechanical properties and endurance is a well-known fact. However, the uneven distribution of nano-fibers in the cement matrix can lead to a decrease in performance. The article focuses on the adaptability of repair materials and cement-based pavement materials, and analyzes the influence of carbon nano-fiber materials on the micro mechanism of con crete reinforcement. Mix proportion tests are conducted by doping carbon nano-fibers with different mass fractions in concrete, and the compressive strength, bonding strength, mass loss rate under freeze-thaw cycles, and bonding strength loss rate are measured respectively. The research shows that when the CNT104 content is 0.1%, the compressive strength and bonding strength of concrete are 60.6 MPa and 11.3 MPa respectively, and the 150 freeze-thaw cycles being over, the mass loss is minimum. When the content of CNT107 is 0.15%, the compressive strength and bonding strength are fairly good, i.e. 59.1 MPa and 11.5 MPa respectively. When the content reaches 0.2%, the mass loss is minimal after 150 freeze-thaw cycles. When the VGCF content is 0.15%, the concrete reaches its maximum compressive strength and bonding strength, i.e. 68.0 MPa and 18.6 MPa respectively. At the same time, the concrete with different contents of VGCF shows better frost resistance. At a content of 0.15%, the quality loss rate of concrete after freeze-thaw cycles is the lowest. After 150 freeze-thaw cycles, the bond strength is measured again. By comparing before and after freeze-thaw, it is found that the decrease rate of bond strength with 0.15% VGCF added is 32.79%, which is the lowest among all groups. The results indicate that taking UHPC mixed with 0.15% VGCF as runway repair material, its fairly good adaptability to cement-based pavement materials is very protruding.

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李长辉, 薛文超, 齐 麟, 刘凌志, 王道通.碳纳米纤维掺杂高性能混凝土修复材料力学性能及抗冻性研究[J].空军工程大学学报,2025,26(2):119-127

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  • 在线发布日期: 2025-03-31
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