PP纤维/碳纳米管协同增强水泥基复合材料的力学与电学性能研究
Study on Mechanical and Electrical Properties of PP Fiber/Carbon Nanotubes Synergistically Reinforced Cement-based Composites
为解决普通水泥基材料缺乏导电功能和韧性差的缺陷,将碳纳米管(CNTs)及聚丙烯(PP)纤维复掺入普通水泥基材料中,系统探究水泥基复合材料(CBC)的力学性能与电学性能,揭示PP与CNTs的协同增强机理。结果表明:单掺CNTs时,CBC的孔隙率先减小后增大,力学性能先升高后降低,体积电阻率先降低后趋于稳定。复掺CNTs和PP纤维对普通水泥基材料具有显著的协同增强效应,在保持良好导电性能的同时提高CBC的力学性能,显著提高其冻融循环后的力学性能和电学性能的稳定性。当CNTs质量分数为0.10%、PP纤维质量分数为0.15%时,CBC的综合性能最佳,抗折强度和抗压强度均显著提升,冻融循环200次后,抗折强度损失率、抗压强度损失率及体积电阻率显著降低。研究结果为制备兼具优异力学性能与电学性能的CBC提供参考。
To address the lack of electrical conductivity and poor toughness of ordinary cement-based materials, carbon nanotubes (CNTs) and polypropylene (PP) fibers were incorporated into ordinary cement-based materials. The mechanical and electrical properties of the cement-based composites (CBC) were systematically investigated, and the synergistic reinforcement mechanism of PP and CNTs was revealed. The results showed that with the addition of CNTs alone, the porosity of CBC first decreased and then increased, the mechanical properties first increased and then decreased, and the volume resistivity first decreased and then stabilized. The combined addition of CNTs and PP fibers exhibited a significant synergistic reinforcing effect on ordinary cement-based materials, improving the mechanical properties while maintaining good electrical conductivity, and significantly enhancing the stability of the mechanical and electrical properties after freeze-thaw cycling. At a CNTs mass fraction of 0.10% and a PP fiber mass fraction of 0.15%, the CBC achieved optimal overall performance, with both flexural and compressive strengths significantly improved. After 200 freeze-thaw cycles, the loss rates of flexural strength, compressive strength, and volume resistivity were significantly reduced. The results provide a reference for the preparation of CBC with excellent mechanical and electrical properties.
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2021年河北省建设科技研究指导性计划项目(2021-2123)
2022年河北省建设科技研究指导性计划项目(2022-2260)
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