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首页> 外文期刊>Building and Environment >Observations on the factors influencing stability of building stones following contour scaling: a case study of oolitic limestones from Budapest, Hungary
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Observations on the factors influencing stability of building stones following contour scaling: a case study of oolitic limestones from Budapest, Hungary

机译：等高线缩放后影响建筑石材稳定性的因素的观察：以匈牙利布达佩斯的橄榄岩石灰岩为例

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Salt-induced decay of porous, granular building stones is often manifested initially by contour scaling, followed by rapid surface retreat through granular disaggregation and/or multiple flaking. It has been hypothesised that rapid retreat in polluted environments could be avoided if newly scaled surfaces can be stabilised by, for example, the re-growth of gypsum crusts. In this paper, we investigate the conditions required to 'switch on and off' rapid decay through a case study of oolitic limestones in a city that continues to experience high levels of atmospheric pollution. In a locally humid location adjacent to the River Danube, positive feedbacks are seen to occur following scaling that favour continuous rapid retreat linked to the synergistic salt weathering effects of halite and gypsum. In contrast, the Castle Hill overlooking the Danube is less prone to winter and autumn fogs and there is evidence that stone retreat here may be more sporadic and that episodes of contour scaling can be interspersed with periods of stability marked by the re-growth of gypsum crusts. On individual stone blocks it is therefore possible to see fragmentary evidence of several crusts. The negative feedbacks that operate to stabilise newly scaled surfaces are thought to be associated with low chloride concentrations, and a relatively dry microclimate at the block surface that inhibits the frequency and depth of surface wetting. This is linked in turn to the continentality of the meteorological climate of Hungary. It is possible, however, that particular significance attaches to the rapid deposition and effective retention of particulate pollutants rich in water-soluble sulphate and coincident biological colonisation of scaled surfaces that aids the adherence of precipitated dust.
机译：盐引起的多孔，粒状建筑石材的腐烂通常首先通过轮廓缩放显示，然后通过粒状崩解和/或多次剥落迅速退缩表面。假设如果通过例如石膏外壳的重新生长可以使新形成的表面稳定，则可以避免在污染环境中的快速后退。在本文中，我们通过对一个持续遭受高水平大气污染的城市中的橄榄岩石灰石进行案例研究，研究了“开启和关闭”快速衰减所需的条件。在多瑙河附近局部潮湿的地方，结垢后会出现积极的反馈，有利于连续快速退缩，这与盐岩和石膏的协同盐风化作用有关。相比之下，俯瞰多瑙河的城堡山更不容易出现冬季和秋季的雾气，有证据表明这里的石头撤退可能更零星，并且轮廓缩放的发作可以散布在以石膏重新生长为标志的稳定时期。地壳。因此，在单个石块上，可能会看到几块硬皮的零碎证据。用来稳定新缩放表面的负反馈被认为与低氯化物浓度有关，并且块体表面的相对干燥的微气候抑制了表面润湿的频率和深度。这又与匈牙利的气象气候的大陆性有关。但是，可能特别重要的是快速沉积和有效保留富含水溶性硫酸盐的颗粒污染物，并在结垢表面同时发生生物定殖，这有助于沉淀尘埃的附着。

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