国家自然科学基金资助项目(11772351)
基于移动粒子半隐式法离散元法（MPSDEM）耦合模型对自密实混凝土(SCC)的J型环试验进行了数值模拟.研究了砂浆塑性黏度、屈服强度及密度对SCC的J型环试验模拟结果的影响.结果表明：砂浆密度不会对J型环试验结果产生较大影响；砂浆的塑性黏度和屈服强度均会对SCC流动时间和流停状态产生影响，且砂浆屈服强度敏感性大于塑性黏度；相同砂浆屈服强度下，随着砂浆塑性黏度的增大，SCC流动时间变长，填充距离减小；相同砂浆塑性黏度下，随着砂浆屈服强度的增大，SCC流动时间变短，填充距离减小；砂浆塑性黏度对于J型环内、外骨料分配的均匀性影响较大，且砂浆塑性黏度越大，骨料分布越均匀.
Based on the moving particle semi implicit method discrete element method(MPS DEM) coupling model, the J ring test of self compacting concrete(SCC) was numerically simulated, the effects of the plastic viscosity, yield strength and density of mortar on the simulation results of SCC J ring test were studied. The results show that the mortars density will not significantly influence the results of the J ring test. The plastic viscosity and yield strength of mortar can affect the expansion flow time and the expansion form. And the sensitivity of mortar yield strength is greater than that of mortar plastic viscosity. With the increase of the mortars plastic viscosity, the flow time of SCC increases, and the filling distance decreases. With the increase of yield strength, the flow time of SCC becomes shorter, and the filling distance decreases with the same viscosity of mortar. The mortar plastic viscosity has a greater impact on the uniformity for the aggregate distribution inside and outside the J ring, and the higher the mortar plastic viscosity, the more uniform the aggregate distribution.
李敬军,田雷,邱流潮.自密实混凝土J型环试验的数值模拟及敏感性分析[J].建筑材料学报,2021,24(3):538-544
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