Cao Tongning, Zhang Lijuan, Sun Guowen, Wang Caihui, Zhang Ying, Yan Na, Xu Aoxue
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
Foundational subjects department, Shijiazhuang TieDao University SiFang College, Shijiazhuang 051132, China.
Materials (Basel). 2019 Nov 4;12(21):3623. doi: 10.3390/ma12213623.
The tortuosity of the pore structure is an important factor affecting medium (water and harmful ions) transport in cement-based materials. In this study, a new tortuosity model was established to reveal the effect of aggregate size, morphology, and graded media on the transport path in cement-based materials. Based on the stereological principle and the geometric algorithm, the distribution model of the ideal pebble and polygonal aggregate in cement-based materials was given first. Then, based on the image processing technology and MATLAB software, the morphology of the actual aggregate was also characterized to prove the similarity relationship between the ideal aggregate and actual aggregate. The reliability of the tortuosity model was verified by the mercury intrusion porosimetry test and data from other literature. Based on the tortuosity model, the influences of the aggregate particle shape parameters, hydration degree, and water-to-cement ratio on the tortuosity of the transport path were analyzed. Finally, the tortuosity model was further simplified to facilitate engineering application.
孔隙结构的曲折度是影响水泥基材料中介质（水和有害离子）传输的一个重要因素。在本研究中，建立了一个新的曲折度模型，以揭示骨料尺寸、形态和级配介质对水泥基材料中传输路径的影响。基于体视学原理和几何算法，首先给出了水泥基材料中理想卵石和多边形骨料的分布模型。然后，基于图像处理技术和MATLAB软件，对实际骨料的形态进行了表征，以证明理想骨料与实际骨料之间的相似关系。通过压汞法试验和其他文献数据验证了曲折度模型的可靠性。基于该曲折度模型，分析了骨料颗粒形状参数、水化程度和水灰比对传输路径曲折度的影响。最后，对曲折度模型进行了进一步简化，以方便工程应用。
