论文部分内容阅读
C-S-H(calcium silicate hydrate,水化硅酸钙)纳米颗粒(约几十到几百个nm)是硬化水泥浆体纳米层次的重要组成,水分在其中的输移特征对硬化水泥浆体有着极其重要的影响。本文通过理论分析,结合原子力显微镜观测结果,提出了水在C-S-H纳米颗粒簇中流动的控制方程,然后确定了黏滞系数和滑移长度2个参数对控制方程的影响,同时考虑C-S-H纳米颗粒表面的范德华力对周围流体的作用,建立了水在C-S-H纳米颗粒簇中流动的物理模型。研究发现,C-S-H纳米颗粒簇间的流体特性不可忽略,在C-S-H纳米颗粒间水分可进行局部的自由交换,交换的结果可能会导致C-S-H纳米颗粒的堆聚结构产生变化,最终会影响水泥基材料的收缩变形行为。
CSH (calcium silicate hydrate) nanoparticles (about tens to hundreds of nm) are important components of the nano-scale of hardened cement paste. The transport characteristics of water in them are extremely important for hardened cement paste Impact. Based on the results of atomic force microscopy (AFM), the governing equation of water flow in CSH nanoparticles clusters is proposed in this paper. Then the influence of viscosity and slip length on the governing equations is determined. At the same time, the influence of CSH nanoparticle surface Van der Waals forces on the surrounding fluids, a physical model of the water flowing in CSH nanoparticle clusters was established. It was found that the fluid properties between the CSH nanoparticles clusters can not be neglected. The moisture exchange between the CSH nanoparticles can be partially localized. The exchange results may lead to the change of the aggregation structure of the CSH nanoparticles and eventually the influence of the cementitious materials Shrinkage deformation behavior.