Assessment of physical weathering effects on grani

Authors: A Momeni G R Khanlari M Heidari R Bagheri E Bazvand

Publish Date: 2015/05/27

Volume: 74, Issue: 6, Pages: 5181-5190

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Abstract

Ancient monuments are significant for the cultural identity of countries and they are also very important from economical point of view There are a lot of environmental damages that affect building materials and monuments Therefore the preservation of the monuments has become a vital challenge Gradual natural destructive factors including freezing and thawing heating and cooling salt weathering and acidic rainfall play an important role in destruction of monuments In this study for assessment of weathering effects on engineering properties of Hamedan granitic monuments heating and cooling up to 600 cycles freezing and thawing up to 300 cycles and salt weathering up to 50 cycles tests have been performed Also in order to estimate the deterioration of the Ganjnameh inscriptions four inscriptions were prepared and subjected to heating and cooling up to 600 cycles freezing and thawing up to 300 cycles magnesium sulfate salt weathering up to 60 cycles and acidic rain up to 1 year time tests The results showed that when compared with that of salt weathering the effects of heating–cooling and freezing–thawing weathering were negligible Also deterioration effect of magnesium sulfate on weight loss has been observed more remarkably than that of sodium sulfate The deterioration effect of sodium sulfate on loss of engineering properties was evaluated more effectively than that of magnesium sulfate Simulation of the Ganjnameh inscriptions behavior subjected to the weathering tests indicated that deterioration effect of sulfate solution was more effective than that of other weathering processesThis work was supported by the BuAli Sina University The authors are grateful to Professor A Sepahi for the help and suggestions in the petrographic studies of granitic rocks and Mr M Samadi for his help during laboratory works Thanks are extended to Dr S Hashemi for his valuable suggestions in editing this paper The authors would also like to thank two anonymous referees for their helpful comments that provided the opportunity to improve the article

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