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首页> 外文期刊>Advances in civil engineering >Time-Varying Compressive Strength Model of Aeolian Sand Concrete considering the Harmful Pore Ratio Variation and Heterogeneous Nucleation Effect
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Time-Varying Compressive Strength Model of Aeolian Sand Concrete considering the Harmful Pore Ratio Variation and Heterogeneous Nucleation Effect

机译：考虑到有害孔径变异和异质成核效应的Aeolian砂混凝土时变压力模型

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摘要

The aim of this study was to analyze the influence mechanism of aeolian sand on the mechanical property of concrete and establish the time-varying compressive strength model. Test studies on the development of concrete's compressive strength with aeolian sand from the Mu Us Desert were carried out. Influence mechanism of aeolian sand on the strength of concrete was revealed by using the nuclear magnetic resonance (NMR) to analyze the pore ratio and structures of aeolian sand concrete (ASC) and using the X-ray single crystal diffraction (XRD) to calculate the relative contents of hydration products semiquantitatively. Results show that the strength first increases and then decreases with the increase of aeolian sand content, where 20% was the best replacement ratio. With less than 20% content, it promoted the strength by changing the pore structure of concrete and accelerating the cement hydration speed based on its filling effect and chemical activity; when the content was more than 20%, it led to a decrease of strength because of an increase of harmful pore ratio and a weakening of the interface transition zone (ITZ), where the stress concentration and damage when loading are easier to occur. At last, a time-varying compressive strength model of ASC considering the harmful pore ratio variation and heterogeneous nucleation effect was established based on the discussion, published date, and American Concrete Institute (ACI) model, which agrees well with the experimental results and can easily predict the strength of concrete.
机译：本研究的目的是分析海湾砂对混凝土力学性能的影响机制，建立时变抗压强度模型。对穆美洲沙漠中的海湾沙子混凝土抗压强度的发展研究进行了研究。使用核磁共振（NMR）揭示了风沙对混凝土强度的影响，分析了海湾砂混凝土（ASC）的孔径和结构，并使用X射线单晶衍射（XRD）计算半定量水合产物的相对含量。结果表明，强度首先增加，随后随着天气砂含量的增加而降低，其中20％是最佳的替代比。含量小于20％，通过改变混凝土的孔隙结构并根据其填充效果和化学活性加速水泥水化速度来促进强度;当含量超过20％时，它导致强度的降低，因为有害的孔径和界面过渡区（ITZ）的弱化，其中应力浓度和装载时的损坏更容易发生。最后，根据讨论，公布的日期和美国具体研究所（ACI）模型建立了考虑有害孔比变异和异构成核效果的时变压缩强度模型，其与实验结果很好容易预测混凝土的强度。

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  • 来源
    《Advances in civil engineering》 |2019年第14期|5485630.1-5485630.15|共15页
  • 作者

    Li Yugen; Zhang Huimei; Liu Xiaoyu; Liu Guangxiu; Hu Dawei; Meng Xiangzhen;

  • 作者单位

    Xian Univ Sci & Technol Coll Architecture & Civil Engn Xian 710054 Shaanxi Peoples R China|Yulin Univ Sch Architecture Engn Yulin 719000 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Architecture & Civil Engn Xian 710054 Shaanxi Peoples R China|Xian Univ Sci & Technol Coll Sci Xian 710054 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Sci Xian 710054 Shaanxi Peoples R China;

    Yulin Univ Sch Architecture Engn Yulin 719000 Shaanxi Peoples R China;

    Yulin Univ Sch Architecture Engn Yulin 719000 Shaanxi Peoples R China;

    Xian Univ Sci & Technol Coll Architecture & Civil Engn Xian 710054 Shaanxi Peoples R China;

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