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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Study of mechanical properties of concrete with low concentration of magnetic nanoparticles
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Study of mechanical properties of concrete with low concentration of magnetic nanoparticles

机译：低浓度磁性纳米粒子的混凝土力学性能研究

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Concrete samples containing small amounts (0.6 wt%) of agglomerated magnetic nanoparticles of cobalt (Co/C) or iron carbide (Fe3C/C) coated with carbon have been synthesized. The time dependence of the compression, bending and contraction strength of samples with and without magnetic nanoparticles have been investigated. Twelve different samples have been prepared and tested during 28 days to detect variation in compression, bending and contraction properties. The temporal change of the bending strength for concrete with and without nanoparticles has showed measurable differences. During the initial stage (first 3 days) of hardening all samples with nanoparticles were less resistant to bending than samples without nanoparticles. After I week samples with iron carbide agglomerates and cobalt nanoparticles showed an increase in resistance to bending in comparison with undoped concrete, 3% and 6%, respectively. After 28 days in both cases the bending strength slowly decreased for samples containing magnetic nanoparticles. The compression strength after 28 days decreased by about 9% for samples containing cobalt and 12% with iron carbide. The contraction increased by about 38% for sample with cobalt ions, however no change was observed for samples containing iron carbide. The FMR investigation has shown that the resonance line has shifted more for samples with cobalt and it has been suggested that this process could be connected with contraction caused by decreasing temperature after freezing [P.C. Aitcin, Cement Concrete Res. 30 (2000) 1349]. This study can be very important for magnetic shielding effects and the selection of optimal conditions for building materials with magnetic nanoparticles. It can also be useful for new technological solutions aimed at increasing the functionality of these materials. (c) 2008 Elsevier B.V. All rights reserved.
机译：已经合成了混凝土样品，该样品包含少量（0.6重量％）的被碳覆盖的钴（Co / C）或碳化铁（Fe3C / C）的凝聚磁性纳米颗粒。已经研究了具有和不具有磁性纳米颗粒的样品的压缩，弯曲和收缩强度的时间依赖性。在28天内准备并测试了十二个不同的样品，以检测压缩，弯曲和收缩特性的变化。具有和不具有纳米颗粒的混凝土的弯曲强度的时间变化显示出可测量的差异。在硬化的最初阶段（前3天）中，所有带有纳米颗粒的样品比没有纳米颗粒的样品抗弯曲性差。一周后，与未掺杂的混凝土相比，含碳化铁附聚物和钴纳米颗粒的样品的抗弯曲性分别提高了3％和6％。在两种情况下，经过28天后，含磁性纳米粒子的样品的弯曲强度都会缓慢降低。对于含钴的样品，28天后的抗压强度降低了约9％，而对碳化铁则降低了12％。对于含钴离子的样品，其收缩增加了约38％，但是对于含碳化铁的样品，未观察到变化。 FMR研究表明，对于含钴的样品，共振线发生了更大的位移，这表明该过程可能与冷冻后温度降低引起的收缩有关[P.C. Aitcin，水泥混凝土资源公司。 30（2000）1349]。这项研究对于磁性屏蔽效果以及选择具有磁性纳米颗粒的建筑材料的最佳条件的选择可能非常重要。对于旨在提高这些材料功能性的新技术解决方案，它也很有用。 （c）2008 Elsevier B.V.保留所有权利。

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