Evaluation of travertine samples deterioration against salt crystallization using alteration index and alteration velocity parameters

Message:
Abstract:
Salt crystallization is one of the important factors on durability and deterioration of building stones. Magnesium sulphate is a common salt that can lead to deterioration, thus it is necessary to consider this subject before select the stones as building facade. In this research, alteration index and alteration velocity were be used to evaluate the durability of travertine against Magnesium sulphate that can be used as criterion in salt crystallization test. For this purpose, fifteen travertine were sampled from different areas in Iran then petrologic, some chemical (density, porosity and water adsorption) and mechanical properties (uniaxial compressive strength and tensile strength) were obtained for samples. Salt crystallization test were carried out 60 cycles and alteration index, alteration velocity were calculated for samples based on the weight loss and appearance variation of samples then relationship between alteration index and alteration velocity with effective porosity, tensile strength and weight was analyzed with regression analysis. The results show that alteration velocity has higher correlation with tensile strength, effective porosity and weight loss whereas the alteration index of the travertine is not. Also the results show that fabric, effective porosity and tensile strength are important factors that controll durability of samples in salt crystallization test.
Language:
Persian
Published:
Journal of Iranian Association of Engineering Geology, Volume:6 Issue: 1, 2014
Pages:
52 to 66
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سامانه نویسندگان
  • Ahmad Zalooli
    Author (1)
    Researcher engineering geology, Tarbiat Modares University, Tehran, Iran
    Zalooli، Ahmad
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