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Effect of Nano Seeds in C-S-H Gel Formation: Simulation Study from the Colloidal Point of View

机译：纳米种子对C-s-H凝胶形成的影响：胶体观点的模拟研究

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摘要

The addition of external nanoparticles, mainly nano silica during the hydration of cement is a field of investigation in high performance cements. The added particles act as seeds and initiate early nucleation and subsequent growth of C-S-H gel. Nucleation is triggered very early, before enough clinker grains are dissolved or in other words, before the super saturation condition is attained. Hence, depending on the amount of added seed, the morphology and the mechanical properties of the product differ. Experimental studies in this area are less favored due to economic reasons and simulation studies are rare in the literature. An earlier work by some of the authors introduced a Monte Carlo model which dealt with the kinetics of the hydration process at early ages. The colloidal model incorporated random nucleation in the bulk, followed by an Avramian style layer by layer growth of 5nm sized C-S-H particles. The model was based on a Random Sequential Addition scheme and enabled a satisfactory rationalization of the early growth of C-S-H gel. In the present study, we extend this model for the addition of extra seeds and for different water to cement ratios.
机译：在高性能水泥中，在水泥水合过程中添加外部纳米颗粒（主要是纳米二氧化硅）是一个研究领域。添加的颗粒充当种子，并开始早期成核和随后C-S-H凝胶的生长。在溶解足够的熟料晶粒之前，换句话说，在达到超饱和条件之前，很早就开始形核。因此，取决于添加的种子的量，产物的形态和机械性能不同。由于经济原因，该领域的实验研究较少受到关注，而文献中很少进行模拟研究。一些作者的较早著作介绍了蒙特卡洛模型，该模型处理了早期的水合作用动力学。胶体模型在主体中结合了随机成核，然后逐层生长5nm尺寸的C-S-H颗粒形成了Avramian样式。该模型基于随机顺序加法方案，并能够令人满意地合理化C-S-H凝胶的早期生长。在本研究中，我们扩展了该模型，以添加额外的种子并适用于不同的水灰比。

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