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首页> 外文会议>Structural studies, repairs and maintenance of heritage architecture XI >Desalination for preservation of murals by electromigration and regulated climate
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Desalination for preservation of murals by electromigration and regulated climate

机译：通过电迁移和调节气候进行脱盐以保存壁画

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The presence of salts is a threat against the preservation of cultural heritage, e.g. murals. The volume change from dissolved salt (ions) to precipitated salts results in crystallization pressure. This crystallization pressure can result in deterioration when the crystallization occurs underneath the surface, resulting in deterioration of the overlying material. The crystallization occurs most often in the evaporation zone, close to the surface, e.g. between the brick masonry and the lime layer with paintings. In the present investigation it was aimed to improve the electromigration (ion transport in an applied electric field) desalination efficiency of a wall section with murals by regulation of the surrounding climate. The idea was to obtain a relative humidity (RH) above the polluting salts deliquesce point (NaCl ～ 76%) to ensure the presence of dissolved salt (ions). A humidifier was used to create high relative humidity and the actual RH was followed with a hygrograph. After two weeks of treatment with an applied electric DC field and regulated climate, the average chloride content for all brick and mortar samples was decreased from 0.6 wt% to 0.1 wt% and for all the brick samples from 0.53 wt% to 0.06wt% on average. The present experiment clearly showed the necessity of a relative humidity around the polluting salts deliquesce point in order to dissolute the salts before they can be transported in an applied electric DC field. Significant desalination was obtained in all the positions within the same range as seen in previous experiments with capillary saturated single bricks.
机译：盐的存在会威胁到文化遗产的保护，例如壁画。从溶解的盐（离子）到沉淀的盐的体积变化导致结晶压力。当结晶发生在表面下方时，该结晶压力可导致劣化，从而导致上覆材料的劣化。结晶最常发生在蒸发区中，靠近表面，例如表面。在砖石和石灰层之间绘画。在本研究中，其目的是通过调节周围的气候来改善壁画壁部分的电迁移（离子在外加电场中的迁移）脱盐效率。其想法是获得高于污染盐潮解点（NaCl〜76％）的相对湿度（RH），以确保存在溶解的盐（离子）。使用加湿器产生较高的相对湿度，并在实际RH后面加上湿度计。经过施加直流电场和调节气候的两周处理后，所有砖和砂浆样品的平均氯化物含量从0.6 wt％降低到0.1 wt％，而所有砖块样品的平均氯含量从0.53 wt％降低到0.06 wt％。平均。本实验清楚地表明，在盐可以在施加的直流电场中运输之前，必须先在污染的盐潮解点附近保持相对湿度，以使盐溶解。与之前的毛细管饱和单砖实验相比，在相同范围内的所有位置均获得了显着的脱盐效果。

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