混凝土碱骨料反应及力学性能细观模拟  

MESO-SCALE PARTICLE MODELING OF ALKALI-SILICA REACTION AND MECHANICAL PROPERTIES OF CONCRETE

作　　者：宋百姓[1] 柯国军[1] 潘坚文[2] SONG Bai-xing KE Guo-jun PAN Jian-wen(School of Urban Construction, University of South China, Hengyang, Hunan 421001, China State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China)

机构地区：[1]南华大学城市建设学院,湖南衡阳421001 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《工程力学》2017年第4期134-139,共6页Engineering Mechanics

基　　金：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)

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。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.

关 键 词：混凝土 碱骨料反应 细观 力学性能 模拟 

分 类 号：TU528.041[建筑科学—建筑技术科学]