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.
作者
宋百姓
柯国军
潘坚文
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)
出处
《工程力学》
EI
CSCD
北大核心
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)
关键词
混凝土
碱骨料反应
细观
力学性能
模拟
concrete
aggregate-silica reaction
meso-scale
mechanical properties
modeling
