粗骨料对高温后沙漠砂混凝土抗压性能影响数值模拟
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O347

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宁夏自然基金项目(2020AAC03044), 国家自然科学基金项目(51368048, 11162015)


Numerical simulation of the coarse aggregate influence on desert sand concrete (DSC) compressive performance after elevated temperature
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    摘要:

    针对高温作用对混凝土强度带来的不利影响以及中砂资源匮乏的问题,将沙漠砂混凝土视为由粗骨料、沙漠砂砂浆及界面相组成的三相复合材料。采用随机骨料模型建模,对高温后沙漠砂混凝土单轴受压破坏过程进行了数值模拟,分析粗骨料体积含量及粒径大小对高温后沙漠砂混凝土单轴抗压性能的影响。结果表明:高温后沙漠砂混凝土的破坏相继发生于界面相、界面相周边砂浆及外围砂浆,混凝土最终沿近对角线方向发生斜向破坏。随粗骨料体积含量增加,沙漠砂混凝土抗压强度先增大后减小,体积含量45%时,抗压强度最大。相对于最小粒径与中间粒径,粗骨料最大粒径对高温后沙漠砂混凝土抗压强度的影响更为显著。本研究可为沙漠砂混凝土的应用提供理论依据。

    Abstract:

    In view of the adverse effects of elevated temperature on DSC strength and the lack of medium sand resources, DSC was regarded as a three-phase composite material composed of coarse aggregate, desert sand mortar and interfacial phases. The random aggregate model was used for modeling, and DSC failure process under uniaxial compression after elevated temperature was numerically simulated. The influences of coarse aggregate volume content and particle size on DSC uniaxial compressive performance after elevated temperature were analyzed. The results showed that the DSC failure after elevated temperature occurred successively in the interface phase, the mortar around the interface phase, the peripheral mortar, and the concrete eventually was broken diagonally along the diagonal direction. With increasing the coarse aggregate volume content, the DSC compressive strength was expanded firstly and then decreased. When the volume content was 45%, the compressive strength reached the highest. Compared with coarse aggregate middle particle size and minimum particle size, the influence of maximum particle size on the change in compressive strength was more significant. This research can provide a theoretical basis for DSC application.

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杨维武,张倩,刘海峰,等. 粗骨料对高温后沙漠砂混凝土抗压性能影响数值模拟[J]. 科学技术与工程, 2021, 21(36): 15571-15580.
Yang Weiwu, Zhang Qian, Liu Haifeng, et al. Numerical simulation of the coarse aggregate influence on desert sand concrete (DSC) compressive performance after elevated temperature[J]. Science Technology and Engineering,2021,21(36):15571-15580.

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  • 收稿日期:2021-04-19
  • 最后修改日期:2021-10-03
  • 录用日期:2021-09-08
  • 在线发布日期: 2022-01-04
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