The aim of this study is to assess pore size distribution changes of the İscehisar (Turkey) andesite in relation to the six artificial accelerated ageing factors such as salt crystallization, freezing–thawing, thermal shock, SO₂ action in the presence of humidity, water vapour transmission, and capillary water absorption. The andesite has a bimodal pore size distribution mainly between 0.1 and 2–3 μm. This work found that artificial accelerated ageing factors have a significant influence on change in pore size distribution of andesite used as building stone. Among six artificial accelerated ageing tests, the highest porosity level recorded for the andesite was 15.603% in salt crystallization test, and the rate of increase of porosity was determined as 28.41%. The effects of all ageing tests resulted in a change in pore size distribution in the andesite. According to the experimental results, the porosity value decreased with the presence of crystallized salts in pores and increased with the growth of existing fissures and the expansion of the pores. These results concluded that the selection of stones for the restoration works of historic monuments or modern use should be made after performing than one destructive test to avoid anomalous results that may arise owing to the influence of individual ageing factors.

中文翻译：

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与人工加速老化因子相关的用作文化遗产建筑石的安山岩（伊斯希希萨尔，土耳其）的孔径分布变化评估

这项研究的目的是评估与六种人工加速老化因素（如盐结晶，冻融，热冲击，SO ₂）有关的İscehisar（土耳其）安山岩的孔径分布变化在湿气，水蒸气传输和毛细管吸水的情况下起作用。安山岩的双峰孔径分布主要在0.1和2-3μm之间。这项工作发现，人工加速老化因子对用作建筑石材的安山岩的孔径分布变化具有重大影响。在六个人工加速时效试验中，盐结晶试验中安山岩记录的最高孔隙度为15.603％，孔隙率的增加率为28.41％。所有老化测试的结果导致安山岩中孔径分布发生变化。根据实验结果，孔隙率值随孔中结晶盐的存在而降低，并随现有裂缝的增长和孔的膨胀而增加。