"基于三维格构模型的长龄期混凝土力学性能预测研究"

The study "Research on the Mechanical Properties of Long-term Concrete Based on Grid-structure Model" aims to investigate and predict the mechanical performance of long-age concrete. The research involves the establishment of a three-phase concrete meso-model based on a three-dimensional grid-structure model that takes into account the real shape aggregate, interfacial transition zone (ITZ), and mortar matrix. By combining physical experiments conducted at the Wanjiakouzi Hydroelectric Power Station project with hydration numerical experiments and uniaxial compression numerical experiments, the study simulates the uniaxial compression failure process of concrete at different ages and establishes a model for the evolution of concrete meso-mechanical parameters based on degree of hydration. The results indicate that the three-phase concrete meso-model constructed based on the three-dimensional grid-structure model can effectively reflect the process of concrete uniaxial compression failure and is consistent with physical experiments. The three-dimensional concrete meso-grid model based on the coupling of concrete hydration and mechanical properties provides a more accurate prediction of concrete compressive strength compared to physical experiments, offering an effective numerical method for predicting the mechanical properties of long-term concrete. Overall, the research highlights the importance of incorporating realistic material characteristics and hydration processes into meso-modeling to better understand and predict the mechanical behavior of long-age concrete. The findings not only contribute to advancing the understanding of concrete properties but also provide valuable insights for the development of numerical methods for predicting the mechanical performance of long-term concrete structures.