Three-Dimensional Computer Simulation of Portland Cement Hydration and Microstructure Development
Three-Dimensional Computer Simulation of Portland Cement Hydration and Microstructure Development
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DOI：
10.1111/j.1151-2916.1997.tb02785.x
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发表时间：
1997
影响因子：
3.9
通讯作者：
D. Bentz
中科院分区：
文献类型：
--
作者：
D. Bentz
本文建立了一个模拟波特兰水泥水化和微观结构发展的三维计算机模型。从测量的粒度分布和一组扫描电子显微镜图像开始，重建感兴趣的水泥的三维表示，匹配二维图像的相体积分数和表面积分数。然后，将一组细胞自动机规则应用于起始微观结构，以模拟在不断发展的水化过程中所有主要相的化学反应。在模型中使用的溶解周期已被校准到真实的时间使用一组参数的两个水泥在三个不同的水-水泥比。基于这种校准，有很好的协议之间的模型预测和实验测量的水化程度，热释放，和化学收缩。水化度的预测已成功地应用于预测两种水泥的砂浆立方体的抗压强度发展。通过在15°、25°和35°C下进行水化实验，并应用成熟度类型关系来确定可与模型预测进行比较的单一水化度-等效时间曲线，来检查温度的影响。最后，计算机模型已被进一步扩展到模拟密封条件下的水合作用，其中自干燥限制了可实现的水合作用。
A three-dimensional computer model for the simulation of portland cement hydration and microstructure development has been developed. Starting with a measured particle-size distribution and a set of scanning electron microscopy images, a three-dimensional representation of a cement of interest is reconstructed, matching the phase volume fractions and surface-area fractions of the two-dimensional images. A set of cellular-automata rules is then applied to the starting microstructure to model the chemical reactions for all of the major phases during the evolving hydration process. The dissolution cycles used in the model have been calibrated to real time using a single set of parameters for two cements at three different water-to-cement ratios. Based on this calibration, there is excellent agreement between the model predictions and experimental measurements for degree of hydration, heat release, and chemical shrinkage. The degree-of-hydration predictions have been successfully applied to predicting the compressive strength development of mortar cubes for the two cements. The effects of temperature have been examined by performing hydration experiments at 15°, 25°, and 35°C and applying a maturity-type relationship to determine a single degree of hydration-equivalent time curve that can be compared to the model predictions. Finally, the computer model has been further extended to simulate hydration under sealed conditions, where self-desiccation limits the achievable hydration.