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The effect of pH and salty solutions on durability of sandstones of the Aghajari Formation in Khouzestan province, southwest of Iran

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Abstract

Slake durability of rocks is a vital engineering geological property of rock materials that has an important role in the promotion of slope stability, evaluation of rock materials, as well as the estimation of stone degradability. This parameter is related to such factors as mineralogy, physical characteristics of rocks, and the environmental conditions. A major part of south and southwestern Iran embraces the Aghajari Formation whose sandstones are used to form the foundations for some structures in Khouzestan province where they are being extensively used as aggregate(s). In this paper, tests of mineralogical examinations, physical properties, and slake durability of sandstones from Ahwaz and Haftkel anticlines were administered in order to assess the durability and degradability of these rocks. The rock durability of each type was evaluated to be up to 15 cycles in acidic and alkaline watery environments and salt aqueous solutions. The results showed that durability of sandstones under study is related to their petrographical and physical characteristics. The durability index of the sandstone samples was decreased by pH reduction and by increasing the concentration of aqueous solutions. The durability index of Ahwaz samples, too, was decreased in basic solutions while this index increased for Haftkel sandstones with the increase in the pH of solutions. Also, the obtained results illustrated that durability index decreased with the increase in the number of cycles. Based on the results, all sandstones show that the durability in sodium sulfate solution is much lower than that for the sodium chloride. Moreover, the slake durability index of the sandstones is decreased with an increase in the concentration of aqueous solutions. As a final statement, the Ahwaz sandstones show lower resistance to weathering processes than Haftkel sandstones; therefore, the use of rocks as building stones is not recommended here.

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Acknowledgments

We are grateful to Dr. B. Rafie from Bu-Ali Sina University, Hamedan, Iran for their help with the XRD analysis and V. Hassanvand for surveying the sandstone thin sections.

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Correspondence to M.H. Ghobadi.

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Ghobadi, M., Mousavi, S. The effect of pH and salty solutions on durability of sandstones of the Aghajari Formation in Khouzestan province, southwest of Iran. Arab J Geosci 7, 641–653 (2014). https://doi.org/10.1007/s12517-012-0741-0

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  • DOI: https://doi.org/10.1007/s12517-012-0741-0

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