Each damage of cement mixture is closely related to the heterogeneity and discontinuity of its internal materials. It is very important to analyze the mechanical evolution behavior of cement mixture with the theory of meso-mechanics to reveal the failure mechanism of cement mixture structure. In this paper, the microscopic parameters of the discrete element model are obtained in the compressive tests of concrete mixture cubes. The three-dimensional discrete element model of cement mixture was established by using these microscopic parameters. Under the action of a certain rate load, the generation and propagation process, stress distribution, transfer and displacement field evolution behavior of the meso-fracture between the cement mixture particles are analyzed. The results show that the error between the simulated discrete element flexural strength test and the actual standard test (flexural strength, micro-strain at the bottom of the specimen) is within 10%, which indicates that the discrete element method can well simulate the discontinuous and heterogeneous materials. When the external load acts, the horizontal and vertical displacement of the cementitious material is greater than that of the coarse aggregate, and the displacement angle of the coarse aggregate is greater than that of the cementitious material. When the horizontal tensile stress between the particles exceeds the bond strength of the material, the bond between the particles will break. There are few micro-cracks at the initial stage. In late stage, the micro-cracks penetrate each other and form larger cracks. Micro-cracks usually occur at the weak bonding position between coarse aggregate and cementitious material. The upper particle changes from compressive stress to tensile stress gradually with the duration of load. The bottom particles are in the non-uniform distribution of tensile stress and compressive stress, and the stress values between the particles are also in the non-uniform distribution.

水泥混合物的每种损坏都与其内部材料的不均匀性和不连续性密切相关。用细观力学理论分析水泥混合料的力学演化行为，揭示水泥混合料结构的破坏机理，具有十分重要的意义。在本文中，离散元模型的微观参数是在混凝土混合料立方体的压缩试验中获得的。利用这些微观参数建立了水泥混合料的三维离散元模型。在一定速率荷载作用下，分析了水泥混合料颗粒间细观裂缝的产生，传播过程，应力分布，传递和位移场演化行为。结果表明，模拟离散单元抗弯强度测试与实际标准测试之间的误差（抗弯强度，试样底部的微应变）在10％以内，这表明离散单元方法可以很好地模拟不连续点和异质材料。当外力作用时，胶凝材料的水平位移和竖向位移大于粗骨料的位移，而粗骨料的位移角大于胶凝材料的位移角。当颗粒之间的水平拉伸应力超过材料的结合强度时，颗粒之间的结合将破裂。初始阶段几乎没有微裂纹。在后期，微裂纹彼此渗透并形成较大的裂纹。微裂纹通常发生在粗骨料和水泥质材料之间的弱粘结位置。随着载荷的持续时间，上部颗粒从压缩应力逐渐变为拉伸应力。底部颗粒处于拉应力和压缩应力的不均匀分布中，并且颗粒之间的应力值也处于不均匀分布中。