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Nanomechanical characterization of cement-based pastes enriched with SiO_2 nanoparticles

机译：富含SiO_2纳米颗粒的水泥基浆料的纳米力学表征

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摘要

Microstructural and nanomechanical surface properties of cement based pastes were experimentally investigated. Samples were prepared from CEMI42.5 cement, with water to cement ratio equal to 0.5 and enriched with SiO_2 nanoparticles (d= 14 nm), with low concentration ranging from 0% up to 0.5% (by weight of binder). X-rays diffraction (XRD) patterns revealed a linear increase of crystal size of calcium hydrate (CH) products with the addition of nanoparticles, while scanning electron microscopy (SEM) images showed a denser microstructure with more defined grains for the higher SiO_2 nanoparticles concentration. Atomic force microscopy (AFM) studies of samples after the grinding/polishing process indicated a strong dependence of surface roughness with the CH crystallite mean size and the materials mechanical properties. Finally, statistical analysis of nanoindentation mapping data revealed a decrease of elastic modulus with the increase of nanoparticles concentration.
机译：实验研究了水泥基浆料的微观结构和纳米机械表面性能。由CEMI42.5水泥制备样品，水与水泥的比例等于0.5，并富含SiO_2纳米颗粒（d = 14 nm），浓度范围从0％到0.5％（按粘合剂重量计）。 X射线衍射（XRD）图谱显示，添加纳米颗粒后，水合钙（CH）产品的晶体尺寸呈线性增加，而扫描电子显微镜（SEM）图像则显示出较高的SiO_2纳米颗粒浓度，其组织致密，晶粒更清晰。研磨/抛光过程后对样品进行的原子力显微镜（AFM）研究表明，表面粗糙度与CH晶粒平均尺寸和材料机械性能密切相关。最后，对纳米压痕图数据的统计分析表明，随着纳米颗粒浓度的增加，弹性模量降低。

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  • 来源
    《Materials Science and Engineering》 |2011年第19期|p.1580-1584|共5页
  • 作者

    I.Zyganitidis; M.Stefanidou; N. Kalfagiannis; S. Logothetidis;

  • 作者单位

    Laboratory for Thin Films Nanosystems & Nanometrology, Physics Department, Aristotle University of Thessaloniki, Greece;

    Laboratory of Building Materials, Department of Civil Engineering, Aristotle University ofThessaloniki, Greece;

    Laboratory for Thin Films Nanosystems & Nanometrology, Physics Department, Aristotle University of Thessaloniki, Greece;

    Laboratory for Thin Films Nanosystems & Nanometrology, Physics Department, Aristotle University of Thessaloniki, Greece;

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  • 正文语种 eng
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  • 关键词

    nanoindentation; nanoparticles; AFM; SEM; XRD; cement;

    机译：纳米压痕纳米粒子原子力显微镜扫描电镜XRD;水泥;

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