| 混凝土碱骨料反应及力学性能细观模拟 |
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| 引用本文： | 宋百姓,柯国军,潘坚文.混凝土碱骨料反应及力学性能细观模拟[J].工程力学,2017,34(4):134-139. |
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| 作者姓名： | 宋百姓 柯国军 潘坚文 |
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| 作者单位： | 1.南华大学城市建设学院, 湖南, 衡阳 421001; |
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| 基金项目： | 国家自然科学基金项目（51378247，51209120，51323014）；湖南省高校创新平台开放基金项目（12k092）；湖南省科技厅项目（2009CG4020） |
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| 摘 要： | 混凝土碱骨料反应是降低混凝土耐久性的主要因素之一，充分认识其对混凝土力学性能的劣化机理，有助于防治碱骨料反应对混凝土结构的危害。该文用颗粒元（PFC2D）方法建立了由骨料、砂浆和界面三相共同组成的混凝土细观模型，模拟了碱骨料反应引起的混凝土膨胀变形与微裂缝扩展过程，并对碱骨料反应劣化后的混凝土试件进行劈裂抗拉试验，研究碱骨料反应对混凝土力学性能的影响。数值模拟结果表明，该模型可有效预测混凝土碱骨料反应膨胀趋势，碱骨料反应显著降低了混凝土的劈裂抗拉强度。
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| 关 键 词： | 混凝土 碱骨料反应 细观 力学性能 模拟 |
| 收稿时间： | 2015-10-11 |
MESO-SCALE PARTICLE MODELING OF ALKALI-SILICA REACTION AND MECHANICAL PROPERTIES OF CONCRETE |
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| Affiliation: | 1.School of Urban Construction, University of South China, Hengyang, Hunan 421001, China;2.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A three-phase meso-scale model of concrete which consists of aggregate, mortar, and interface between aggregate and mortar is established by pre-processing approach and the particle flow code (PFC2D). A homogeneous aggregate expansion procedure is proposed to simulate alkali-aggregate reaction, and splitting tensile test is conducted to explore the mechanical properties of concrete subjected to the alkali-aggregate reaction. The numerical simulation shows that this model can effectively predict the expansion trend of concrete alkali aggregate reaction expansion; the splitting tensile strength of concrete subjected to the alkali-aggregate reaction fell sharply. |
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