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A new model for investigating the formation of interfacial transition zone in cement-based materials
Cement and Concrete Research ( IF 10.9 ) Pub Date : 2024-11-20 , DOI: 10.1016/j.cemconres.2024.107675
Xuan Gao, Qing-feng Liu, Yuxin Cai, Liang-yu Tong, Zesen Peng, Qing Xiang Xiong, Geert De Schutter

The interfacial transition zone (ITZ), located between aggregate and cement paste, has the features of high porosity, low unhydrated cement content, and enrichment of calcium hydroxide crystals (CH) and is often regarded as the weak link in cement-based materials. The present study is devoted to investigating the influence of multiple mechanisms or factors on ITZ formation, including the wall effect, ion transport, and aggregate features. A new modelling system is proposed to assess the interactions between these mechanisms or factors. The time-spatial distribution of hydration products and pores is studied by considering the reaction-diffusion-crystallization process of a non-uniformly distributed cement. Based on the developed model, the effects of individual mechanisms and their interactions on ITZ formation were clarified. The results indicated that the wall effect would determine the spatial distribution of cement and most hydration products due to the repulsion of aggregates on cement particles. The ion transport would influence the time evolution and redistribution of hydration products, which couples with the role of the wall effect. It was also found that aggregate features, including spacing and surface roughness, can affect the distribution of cement and the heterogeneity of cement-based materials, which works synergistically with the wall effect.

中文翻译:


研究水泥基材料界面过渡区形成的新模型



界面过渡区 (ITZ) 位于骨料和水泥浆体之间,具有高孔隙率、低未水化水泥含量和氢氧化钙晶体 (CH) 富集的特点,通常被认为是水泥基材料中的薄弱环节。本研究致力于研究多种机制或因素对 ITZ 形成的影响,包括壁效应、离子输运和聚集体特征。提出了一种新的建模系统来评估这些机制或因素之间的相互作用。通过考虑非均匀分布的水泥的反应-扩散-结晶过程,研究了水化产物和孔隙的时空分布。基于开发的模型,阐明了单个机制及其相互作用对 ITZ 形成的影响。结果表明,由于骨料对水泥颗粒的排斥,壁效应将决定水泥和大多数水化产物的空间分布。离子传输会影响水合产物的时间演变和重新分布,这与壁效应的作用相耦合。研究还发现,骨料特征(包括间距和表面粗糙度)会影响水泥的分布和水泥基材料的异质性,这与墙体效应协同作用。
更新日期:2024-11-20
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