The freezing of sulfate saline soil involves the coupling effect of heat and mass transfer and crystallization deformation. The influence of salt content and temperature on the crystallization of ice and salt was analyzed by using a one‐side freezing experiment. Based on the effect of solute and temperature on water activity, a crystallization kinetics model of ice–water phase change in saline soil was established. The application of supersaturation in the crystallization kinetics model of solution–crystal phase change is improved with the Frezchem model. The calculated results are compared with experimental data to validate the effectiveness of the proposed model. the study shows that: (a) crystallization can be well illustrated by the proposed model based on the concepts of the formation factor of ice crystals and solution supersaturation; (b) convection and diffusion are the main means of salt redistribution, which cause the accumulation of salt above the freezing front and the formation of discontinuously distributed–layered salt crystal zones; and (c) the alternate crystallization of ice and salt increases variation i solute concentration and then increases crystallization pressure, which leads to the deformation of salt expansion.

中文翻译：

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单向冻结过程中硫酸盐渍土结晶变形机理的研究

硫酸盐盐土的冻结涉及传热传质与结晶变形的耦合作用。通过单侧冷冻实验分析了盐含量和温度对冰和盐结晶的影响。基于溶质和温度对水分活度的影响，建立了盐渍土冰水相变的结晶动力学模型。Frezchem模型改进了过饱和在溶液-晶体相变结晶动力学模型中的应用。将计算结果与实验数据进行比较，以验证所提出模型的有效性。研究表明：（a）基于冰晶形成因子和溶液过饱和的概念，所提出的模型可以很好地说明结晶；（b）对流和扩散是盐分再分配的主要手段，它导致盐分在冰冻锋面以上积累，并形成不连续分布的分层盐晶体区；（c）冰和盐的交替结晶增加了溶质浓度的变化，然后增加了结晶压力，从而导致盐膨胀变形。