细观尺度下橡胶集料混凝土钢筋非均匀锈胀反力研究
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1.同济大学 道路与交通工程教育部重点实验室;2.同济大学交通运输工程学院

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TU375

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on non-uniform rust expansion reaction force of rubber concrete reinforcement at mesoscopic scale
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    摘要:

    钢筋锈蚀会导致橡胶集料混凝土开裂,降低橡胶集料混凝土结构耐久性。钢筋锈蚀膨胀引起的锈胀反力变化可大致反映橡胶集料混凝土的开裂过程。因此,本文对橡胶集料混凝土内单根钢筋均匀锈蚀膨胀产生的反力进行了细观数值模拟研究。结果表明:(1)随着钢筋锈蚀程度的增加,钢筋锈胀反力先增加后减小,锈胀反力拐点出现时机对应混凝土开裂时机;(2)钢筋锈蚀时总是钢筋上半区砂浆最先破坏;且混凝土保护层厚度越小,橡胶集料混凝土开裂越容易;(3)保护层厚度不变,钢筋直径越大,橡胶集料混凝土开裂越容易。(4)在本文的计算模型中,在拐点产生后,钢筋平均锈胀反力的大小关系对应橡胶集料含量为10%>5%>8%。本文研究成果对橡胶集料混凝土锈蚀反力研究具有指导意义。

    Abstract:

    Corrosion of steel bars will lead to cracking of rubberized concrete and reduce the durability of rubberized concrete. The variation of rust expansion reaction caused by corrosion of steel bars can roughly reflect the cracking process of rubberized concrete. Therefore, in this paper, the reaction force of a single steel bar in rubberized concrete caused by uniform corrosion and expansion is studied by mec-numerical simulation. The results show that : (1) With the increase of corrosion degree of reinforcement, the steel rust expansion reaction first increases and then decreases, and the time of the inflection point of rust expansion reaction corresponds to the time of concrete cracking;(2) With the increase of corrosion degree of reinforcement, the mortar in the upper half of the reinforcement is always destroyed first; And the smaller the thickness of concrete protective layer, the easier the rubber aggregate concrete cracking;(3) The thickness of the protective layer remains unchanged, and the larger the diameter of the reinforcement, the easier the rubberized concrete cracks.(4) In the calculation model in this paper, the size relation of the average rust expansion reaction of reinforcement corresponds to the rubber aggregate content of 10%>5%>8%.The research results of this paper have guiding significance for the study of corrosion reaction of rubberized concrete.

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  • 收稿日期:2020-06-16
  • 最后修改日期:2020-07-23
  • 录用日期:2020-07-30
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