自密实混凝土粗骨料运动及静态离析的CFD数值模拟  

CFD Numerical Simulation of Movement and Static Segregation of Self-compacting Concrete Aggregate

作　　者：崔溦[1,2,3] 孟苗苗 宋慧芳[3] CUI Wei;MENG Miaomiao;SONG Huifang(State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China;Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration, Tianjin University, Tianjin 300350, China;School of Civil Engineering, Tianjin University, Tianjin 300350, China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300350 [2]天津大学中国地震局地震工程综合模拟与城乡抗震韧性重点实验室,天津300350 [3]天津大学建筑工程学院,天津300350

出　　处：《建筑材料学报》2021年第1期39-44,共6页Journal of Building Materials

基　　金：国家自然科学基金雅砻江联合基金资助项目(U1765106);国家自然科学基金资助项目(52079092)。

摘　　要：采用移动刚体(GMO)方法,将新拌自密实混凝土(SCC)视为粗骨料与砂浆相混合的两相固液介质,对粗骨料运动及静态离析现象进行计算流体力学(CFD)数值模拟.分析了砂浆的屈服应力和塑性黏度对粗骨料运动过程的影响,研究了3种级配的SCC中粗骨料在砂浆中的运动行为.结果表明:砂浆的屈服应力对SCC静态离析具有显著影响,而砂浆的塑性黏度对其影响不大;虽然不同的骨料级配在相同条件下的离析行为不尽相同,但仍体现出一定的规律性,其中大粒径骨料含量较少、小粒径骨料含量较多的级配相对稳定.The general moving object(GMO)method was used to simulate the motion and static segregation of fresh self-compacting concrete(SCC)considering the fresh self-compacting concrete as a two-phase solid-liquid medium.The effect of yield stress and viscosity of mortar on aggregate movement process was studied.Based on this,the movement behavior of three groups of self-compacting concrete coarse aggregates with different gradation in mortar was studied.The results show that the yield stress of mortar has an obvious effect on the static segregation of concrete,while the viscosity has little effect.The segregation behavior of different aggregate gradations under the same conditions is different,but it still shows certain regularity.Under the same conditions,gradation with less content of large particle size aggregate and more content of small particle size aggregate is relatively stable.

关 键 词：自密实混凝土 离析 骨料随机建模 砂浆流变性 级配 

分 类 号：TU528.01[建筑科学—建筑技术科学]