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Soiling of building stones in urban environments

机译：城市环境中建筑石材的污染

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This paper studies the black soiling rate of building granite, marble and limestones in two urban environments with different climates. Specimens were placed horizontally, sheltered and unsheltered from rainfall. Colour changes were monitored. Changes in L* were utilised to determine the total darkening of the stones and their soiling rate and were compared by statistical analysis. Black soiling depended on the type of stone and exposure. Limestones, mainly, showed a soiling proportional to the square root of the time of exposure. In this case, soiling coefficients could indicate frequency of necessary cleaning. The rest of the selected stones did not show such an evident relationship. The soiling tendency of all sheltered limestones was quite similar and more severe than in marble and granite. Soiling was related to the stone colour, type of voids and surface characteristics. Soiling of unsheltered specimens also seemed to depend on the rainfall conditions (rain periods, intensity, amount, temperature, etc.), which could influence both particle deposition and removal from stone surfaces.
机译：本文研究了在两个气候不同的城市环境中建筑花岗岩，大理石和石灰石的黑色污染率。将标本水平放置，避开雨淋，避开雨淋。监测颜色变化。利用L *的变化来确定石头的总变黑及其污染率，并通过统计分析进行比较。黑色污染取决于石头的类型和暴露程度。石灰石的污渍主要与暴露时间的平方根成正比。在这种情况下，污染系数可能表示需要清洁的频率。其余选定的宝石没有显示出如此明显的关系。与大理石和花岗岩相比，所有掩蔽的石灰石的污染趋势都非常相似且更为严重。污染与石材的颜色，空隙类型和表面特征有关。不受保护的标本的污染似乎也取决于降雨条件（降雨时间，强度，数量，温度等），这可能会影响颗粒的沉积和从石材表面的去除。

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