硫酸盐侵蚀作用下纳米混凝土力学特性及微观结构劣化机制研究
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张嘉成(1997—),男,硕士研究生。主要从事纳米改性混凝土的研究。E-mail:1084092511@qq.com

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TU528

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国家自然科学基金(42101136,42071087);四川省自然科学基金(2022NSFSC0429);中国博士后科学基金(2021M692697);冻土工程国家重点实验室开放基金(SKLFSE202007);四川省科技计划项目(2021YFQ0021)资助


Study on Mechanical Properties and Microstructure Deterioration Mechanism of Nano-concrete under Sulfate Attack
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    摘要:

    硫酸盐侵蚀一直是影响混凝土耐久性的重要因素之一,特别是在西北寒旱及沿海盐渍土区。基于试验研究了硫酸盐侵蚀作用下,掺纳米 SiO2和纳米 CuO 混凝土的抗压强度、轴向应力‐应变以及微观特性,并分析了硫酸盐侵蚀环境下纳米材料的改性效果。试验结果表明:随着纳米 CuO 掺量的提高,混凝土的抗压强度、剩余强度系数逐渐降低;当纳米 SiO2掺量增加时,混凝土的抗压强度、剩余强度系数先降低后升高。相比于未掺加纳米材料混凝土,掺入纳米材料能显著提高混凝土的延性。同时,对于提高混凝土的抗压强度纳米材料具有最佳掺入量,纳米 SiO2和纳米 CuO 的最佳掺量分别为 3% 和 1%(质量分数)。此外,纳米材料具有桥接和填充效应,能抑制混凝土裂缝的发展、细化孔隙结构、提高密实度,进而提高混凝土的力学性能。

    Abstract:

    Sulfate attack has always been an important factor affecting the durability of concrete, especially in the northwest cold and arid regions, and coastal saline soil area of China. Based on experiments, the compressive strength, axial stress-strain and microstructure properties of concrete modified with nano-SiO2 and nano-CuO under the influence of sulfate attack were studied, and the strengthened effect of nano-materials was analyzed. The results show that with the increase of nano-CuO content, the compressive strength and residual strength coefficient of concrete gradually decreased. When the content of nano-SiO2 increases, the compressive strength and residual strength coefficient first decrease and then increase. Compared with the concrete without adding nano-materials, the addition of nano-materials can improve the ductility of concrete. With the increase of erosion time, the ductility of nano-concrete is better. Meanwhile, there is an optimum content of nano-materials for improving the compressive strength of concrete, and the optimum contents of nano-SiO2 and nano-CuO are 3% and 1%(quality score), respectively. Additionally, nano-materials have a certain bridging and filling effect, which might affect the degree of crack propagation, refine the pore structure and improve the compactness of nano-concretes, thereby improving the mechanical properties of concrete.

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张嘉成,万旭升,路建国,高佳佳,刘骏霓,周晓曼.硫酸盐侵蚀作用下纳米混凝土力学特性及微观结构劣化机制研究[J].防灾减灾工程学报,2023,43(6):1425-1433

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  • 收稿日期:2022-05-04
  • 最后修改日期:2022-07-12
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  • 在线发布日期:2024-01-11
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