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首页> 外文期刊>Science and Engineering of Composite Materials >Modeling cement hydration by connecting a nucleation and growth mechanism with a diffusion mechanism. Part II: Portland cement paste hydration
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Modeling cement hydration by connecting a nucleation and growth mechanism with a diffusion mechanism. Part II: Portland cement paste hydration

机译：通过将成核和生长机理与扩散机理联系起来，对水泥水化进行建模。第二部分：波特兰水泥浆水化

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A particle-based C_(3)S hydration model with only three rate constants developed in Part I of this study is further developed and applied to Portland cement paste hydration. Experimental data are obtained with chemical shrinkage tests of cement pastes prepared with different water to cement (w/c) ratios (0.3–0.5), and cured at different temperatures (24°C–63°C) and pressures (0.69–51.7 MPa). The proposed model produces exceptionally good fits to test data. The fitted results indicate that the entire process of cement hydration can be modeled by connecting a nucleation and growth mechanism with a diffusion mechanism. Furthermore, the results reveal that the deceleration period of cement hydration may be due to the gradual transition of the rate-controlling mechanisms of different particles. The fitted rate constants generally follow basic chemical kinetics laws in terms of their dependencies on curing temperature and pressure, and appear to be largely independent of w/c ratio.
机译：在本研究的第一部分中开发的仅具有三个速率常数的基于粒子的C_（3）S水化模型被进一步开发，并应用于波特兰水泥浆水化。通过以不同的水灰比（w / c）（0.3–0.5）制备的水泥浆的化学收缩测试获得实验数据，并在不同的温度（24°C–63°C）和压力（0.69–51.7 MPa）下固化）。所提出的模型可以很好地拟合测试数据。拟合结果表明，可以通过将成核和生长机理与扩散机理联系起来，对水泥水化的整个过程进行建模。此外，结果表明，水泥水化的减速期可能是由于不同颗粒的速率控制机制的逐渐转变所致。就它们对固化温度和压力的依赖性而言，拟合速率常数通常遵循基本化学动力学定律，并且似乎在很大程度上与w / c比无关。

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