干湿循环下再生混凝土氯离子传输行为的细观模拟研究
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1.武汉工程大学土木工程与建筑学院;2.武汉大学水利水电学院

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TU528

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湖北省教育厅科学研究计划项目(Q20221514);武汉重点研发计划项目(2022022202015022、2023020402010593);武汉市知识创新专项曙光计划项目(No.2023020201020436);武汉工程大学研究生教育创新基金(CX2022204).


Microscopic Simulation Study of Chloride Ion Transport Behavior in Recycled Concrete under Dry-Wet Cycles
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School of Civil Engineering and Architecture,Wuhan Institute of Technology

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    摘要:

    基于蒙特卡洛法,利用Python与Abaqus接口进行二次开发,生成区分天然粗骨料、新、旧界面过渡区(ITZ)和新、旧砂浆的再生混凝土(RAC)二维细观五相模型。提出改进的干湿循环下水分-氯离子耦合模型,并将该模型的计算结果与物理试验进行对比验证,结果吻合较好。将该模型应用于分析干湿循环周期、ITZ渗透率、水胶比和天然骨料体积分数对氯离子传输性能的影响规律。结果表明,在干湿循环次数增加的情况下,RAC中氯离子的扩散深度和浓度也会随之增加。当ITZ扩散系数与新砂浆扩散系数的比值增大时,氯离子的扩散区域中氯离子浓度增加明显,尤其是在扩散区的前端位置(距离起点12.5mm处)氯离子浓度增加最为显著。此外,不同水灰比的RAC材料与氯离子的传输能力之间存在正相关关系,高水灰比范围内氯离子传输性能变化较小。最后,再生骨料体积分数对RAC的抗氯离子渗透性能产生显著影响,这说明ITZ和新旧砂浆对氯离子的传输具有重要影响。

    Abstract:

    Based on the Monte Carlo method, Python was used for secondary development through the Abaqus interface to generate a two-dimensional microstructural five-phase model for Recycled Aggregate Concrete (RAC), distinguishing between natural coarse aggregates, the transition zone (ITZ) between new and old interfaces, and new and old mortar. An improved moisture-chloride ion coupling model under dry-wet cycles was proposed, and the computational results of this model were compared and validated against physical experiments, with good agreement. This model was then applied to analyze the effects of dry-wet cycle periods, ITZ permeability, water-cement ratio, and natural aggregate volume fraction on chloride ion transport properties.The numerical results showed that as the number of dry-wet cycles increased, the diffusion depth and concentration of chloride ions in RAC also increased. When the ratio of ITZ diffusion coefficient to the new mortar diffusion coefficient increased, the chloride ion concentration in the diffusion region increased significantly, especially at the front end of the diffusion zone (at a distance of 12.5 mm from the starting point). In addition, there was a positive correlation between RAC materials with different water-cement ratios and chloride ion transport capacity, with little variation in chloride ion transport performance within the high water-cement ratio range. Finally, the volume fraction of recycled aggregates had a significant impact on the chloride ion permeability of RAC, indicating that the ITZ and new and old mortar have an important influence on the transport of chloride ions

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白希选,陆定洋,赵程,等. 干湿循环下再生混凝土氯离子传输行为的细观模拟研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-10-23
  • 最后修改日期:2024-06-18
  • 录用日期:2024-06-24
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