砂浆碱集料反应细观数值模拟

Meso numerical simulation of alkali aggregate reaction in mortar

由于局部砂浆碱集料现场测试中存在着对上部竖向的压力,为研究砂浆碱集料反应的力学性能,进行了砂浆碱集料反应细观数值模拟。用砂浆棒快速法制备了试样,进行了砂浆试样膨胀率、抗压强度、抗折强度测定;将砂浆试样看作由骨料、界面过渡区(ITZ)和砂浆基体组成的三相复合材料,建立了碱集料反应膨胀模型和碱集料反应强度模型,模拟了不同尺寸规格试样在不同龄期的抗压和抗折性能,解决了砂浆抗压强度和抗折强度较高的问题,仿真结果与测试结果基本一致,证明该模拟仿真具有较好的实用性。

Because there is vertical pressure on the upper part in the field test of local mortar alkali aggregate,in order to study the mechanical properties of mortar alkali aggregate reaction,a mesoscopic numerical simulation of mortar alkali aggregate reaction was carried out.The sample was prepared by mortar bar rapid method,and the expansion rate,compressive strength and flexural strength of mortar sample were measured.The mortar sample was regarded as a three-phase composite material composed of aggregate,interface transition zone(ITZ)and mortar matrix,and the alkali-aggregate reaction expansion model and alkali-aggregate reaction strength model were established to simulate the compressive and flexural properties of samples with different sizes at different ages,which solves the problem of high compressive and flexural strength of mortar,and obtains the conclusion that the simulation results are basically consistent with the test results.The simulation has good practicability.