Destructive effects of the climatic pollution on decorative limestone

azadeh taheri karimi¹

1) academic member of iran cultural heritage org

IOI Code : XACK-BHKEC
Publication : Second International Conference on Applied Sciences and Engineering Sciences, Shanghai, China(iasesconf.com)
Abstract :
    Sepah Salar mosque is located in central and the most crowded region of Tehran(35°41 20 N - 51°26 0 E ) . Because of the increased use of fuel oil for industries as well as the general increase in motor vehicle traffic Air quality in Tehran has worsened. In this study it is tried to evaluate the impact of Tehran’s climatic hazards on historical structures specially Sepah Salar mosque adornments, by presenting an statistic evaluation based on chemical reactions. This is an experimental study regarding to the impact of climatic pollution on the structural material of the above mentioned mosque. Special attention was paid on a piece of gray old Limestone of the Sepah Salar Mosque as the sample of the study. Uni-axial stress pattern of the limestone sample was determined before any treatment. Then X-ray analysis of the sample was performed and after that Physical properties of the limestone before consolidation was investigated in the laboratory. Many different consolidants were used in this study in order to define their chemical impact on the sample taken from the Sepah Salar Mosque. Using a piece of gray old Limestone of the Sepah Salar Mosque , analytical investigations were performed using freeze _Thaw analysis, XRD,X_ray fluorescence(XRF),determination of physical properties , stereo microscope (150 x) and electron microscope . Different results have been found related to each consolidants.One of the most important points that we figured out through our assessment, is the fact that streaks existence & those nature make the stone more vulnerable. In all of our samples (consolidated or non-consolidated) we see that the primitive damage occurs always along the streaks

Keywords : lime stone decorative elements consolidants