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Numerical simulation of heat and mass transport during hydration of Portland cement mortar in semi-adiabatic and steam curing conditions

机译：半绝热和蒸汽固化条件下硅酸盐水泥砂浆水化过程中传热和传质的数值模拟

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摘要

A model that describes hydration and heat-mass transport in Portland cement mortar during steam curing was developed. The hydration reactions are described by a maturity function that uses the equivalent age concept, coupled to a heat and mass balance. The thermal conductivity and specific heat of mortar with water-to-cement mass ratio of 0.30 was measured during hydration, using the Transient Plane Source method. The parameters for the maturity equation and the activation energy were obtained by isothermal calorimetry at 23 °C and 38 °C. Steam curing and semi-adiabatic experiments were carried out to obtain the temperature evolution and moisture profiles were assessed by magnetic resonance imaging. Three specimen geometries were simulated and the results were compared with experimental data. Comparisons of temperature had maximum residuals of 2.5 °C and 5 °C for semi-adiabatic and steam curing conditions, respectively. The model correctly predicts the evaporable water distribution obtained by magnetic resonance imaging.
机译：建立了描述蒸汽固化过程中硅酸盐水泥砂浆中水化和热质传输的模型。水化反应由成熟度函数描述，该函数使用等效的年龄概念，并结合了热量和质量平衡。使用瞬态平面源法测量水合质量比为0.30的砂浆的导热系数和比热。通过等温量热法在23°C和38°C下获得成熟度方程式和活化能的参数。进行蒸汽固化和半绝热实验以获得温度变化，并通过磁共振成像评估水分分布。模拟了三个样品的几何形状，并将结果与​​实验数据进行了比较。在半绝热和蒸汽固化条件下，温度比较的最大残差分别为2.5°C和5°C。该模型可以正确预测通过磁共振成像获得的蒸发水分布。

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