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《工程(英文)》 >> 2019年 第5卷 第6期 doi: 10.1016/j.eng.2019.02.007

混凝土中碱硅反应效应的多尺度均质化分析

a Department of Civil and Environmental Engineering, Northwestern University, Evanston, IL 60208, USA

b Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA

收稿日期 :2018-08-28 修回日期 :2018-12-01 录用日期 : 2019-02-20 发布日期 :2019-05-24

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摘要

碱硅反应(ASR)是混凝土结构(如桥梁和水坝)在长期的高湿度环境下发生的主要劣化机制之一。ASR是骨料中活性硅成分与水泥浆中碱金属离子之间发生的一种化学反应。这种化学反应会产生ASR凝胶,该凝胶吸水后膨胀,造成混凝土损坏和开裂,最终导致混凝土力学性能下降。本研究基于晶格离散粒子模型(LDPM),研究了混凝土的ASR损伤。LDPM可在粗骨料尺度上模拟混凝土,它是一种中尺度力学模型。作者已经成功地利用LDPM框架对ASR建模,并且通过实验数据对所得模型ASR-LDPM进行了校准和验证。本研究将ASR-LDPM用作中尺度模型,并采用最新开发的多尺度均质化框架来模拟ASR的宏观尺度效应。作者首先分析了由ASR-LDPM模拟的混凝土代表性体积元(RVE)在拉伸和压缩两种情况下的均质化行为,并研究了ASR对混凝土有效力学性能的影响。接下来,作者利用已开发的均质化框架再现了关于混凝土棱柱体自由体积膨胀的实验数据。最后,作者通过中尺度模型和所提出的多尺度方法,评估了压缩和四点弯曲梁中棱柱体的强度退化现象,以分析后者的准确性和计算效率。在所有数值分析中,作者考虑了具有不同内部粒子划分的RVE大小,以探讨它们对均质化响应的影响。

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