古建筑灰浆流失现象及初步分析

The Preliminary Analysis on Lime Mortar Drain Phenomena in Ancient Buildings

在对古建筑的调查中,经常会发现建筑外部有白色覆盖的情况。通过对石灰灰浆的成分、物理化学特性、在古建中应用、在不同环境因素影响下发生的变化进行分析。最终解释了古建筑表面的白色沉积物是碳酸钙,作为胶结材料,在弱酸环境下形成碳酸氢钙,从原始位置流失,然后在温度和环境变化下出现沉淀,重新形成碳酸钙,导致了局部的积聚。

In the survey of ancient buildings, we often find the external part of buildings covered with white. Through the analysis of the composition of lime mortar, physical and chemical properties,application in ancient buildings, changes under different environmental factors, we finally found out that the white deposits on the surface of the ancient buildings are calcium carbonate. As cementing material,under a weak acid environment,calcium carbonate can form calcium bicarbonate; and then it runs away from the original position; and then appears precipitate, when the temperature and environmental changes,forming calcium carbonates again, which leading to the partial accumulation.