| 何真,郑巧,蔡新华.水化硅酸钙纳米颗粒间水特性[J].水利学报,2014,45(2): |
| 水化硅酸钙纳米颗粒间水特性 |
| Water characteristics between nanoparticles of calcium silicate hydrate |
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| DOI： |
| 中文关键词: 水化硅酸钙 纳米颗粒 纳米尺度 流体 输移 模型 |
| 英文关键词: calcium silicate hydrate nanoparticles nanometer scale fluid transport model |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| C-S-H（calcium silicate hydrate）nanoparticles （approximately tens nm to hundreds nm） is an important component of the hardened cement paste at the nano-level，and the transport characteristic of water in it has an extremely important impact on the performance of hardened cement paste. The control equation of fluid flow in the C-S-H nanoparticles clusters is proposed based on theoretical analysis and the test results of AFM （atomic force microscope）. Two related parameters of viscosity coefficient and slip length are analyzed. In addition， at the meantime the influence of van der waals force generated by the C-S-H nanoparticles clusters upon the nanofluid flow is taken into account， based on which together the physical model of fluid flow in the C-S-H nanoparticles clusters has been built finally. The study has found that
the nano flow in the C-S-H nanoparticles clusters cannot be neglected. The fluid can exchange freely in local part， while its impact on macro-permeability of cement-based materials is insignificant. The exchange in local part may result in the interaction between the C-S-H nanoparticles and affect the behavior of cement-based materials. |
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