Salt weathering is one of the major causes of the damage both in cultural heritage as well as in civil engineering constructions. A special case develops when there is a continuous wicking of a salt solution into a material in combination with evaporation of the moisture at its surface. In this study we are interested in the case where the absorption rate is much higher than the evaporation and as a result a salt concentration will build up at the drying surface resulting in crystallization. To this end we propose a simplified model to describe this mechanism. In order to check the model the NaCl concentration profiles were measured non-destructively by Nuclear Magnetic Resonance during a combined wicking and evaporation experiment with limestone. A good correlation was found between the model and the measured NaCl concentration profiles.

中文翻译：

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石灰石中 NaCl 溶液的芯吸和蒸发组合的简化模型

盐风化是造成文化遗产和土木工程破坏的主要原因之一。当盐溶液连续芯吸到材料中并结合其表面水分蒸发时，会出现一种特殊情况。在这项研究中，我们对吸收率远高于蒸发率的情况感兴趣，因此盐浓度将在干燥表面积聚，导致结晶。为此，我们提出了一个简化模型来描述这种机制。为了检查模型，在使用石灰石的芯吸和蒸发组合实验期间，通过核磁共振无损地测量了 NaCl 浓度分布。在模型和测量的 NaCl 浓度分布之间发现了良好的相关性。