Abstract: The mineral admixtures used in modern cement-based materials make the study of the evolution characteristics of cement stone microstructures more complicated. In this paper, the oxide composition and content of the material are fully considered, and the hydration rate parameters of Portland cement (PC), fly ash (FA) and blast furnace slag (BFS) are calculated and substituted into the HYMOSTRUC3D software for modeling. With considering the influence of water-cement ratio and mineral admixture, the relationship between cement, C-S-H, CH, hydration heat, porosity, pore size distribution with the hydration age were established and the evolution of microstructure during cement hydration was obtained. The contents of CH and C-S-H were obtained based on the model established in HYMOSTRUC3D, and compared with XRD test results and CEMHYD3D simulation results. The generation of CH in cement hydration process and the consumption of cement-base materials mixed with FA or BFS were considered. And the effects of different amounts of active mineral admixtures on cement were simulated and studied. At the same time, the influence of water-cement ratio on porosity and pore size distribution and porosity and pore size distribution over time were predicted. The results show that the simulation results of HYMOSTRUC3D are in good agreement with the XRD test results and the CEMHYD3D simulation results, which verifies the calculated hydration rate parameters and the established model. The study also found that the incorporation of FA or BFS can consume CH produced by cement hydration, and can effectively control the hydration heat release of cement-based materials, the larger the dosage, the more CH consumed, and the more obvious the heat control effect. In addition, the larger the water-cement ratio, the larger the porosity of the cement stone, the more the macropore, and the wider the pore size distribution.
郑少军, 刘天乐, 蒋国盛, 李丽霞, 白世卿, 余尹飞, 全奇. 基于HYMOSTRUC3D的水泥基材料微结构变化规律研究[J]. 材料导报, 2020, 34(22): 22047-22053.
ZHENG Shaojun, LIU Tianle, JIANG Guosheng, LI Lixia, BAI Shiqing, YU Yinfei, QUAN Qi. Research on Cement Hydration Microstructure Evolution Process Based on HYMOSTRUC3D Model. Materials Reports, 2020, 34(22): 22047-22053.
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2020, Vol. 34 
