TY - JOUR ID - 69666 TI - Comparison between Salt crystallization weathering test and natural weathering in Mesozoic’s anisotropic rocks, a case study: Arakʾs Calcareous slates, Iran JO - Geopersia JA - GEOPE LA - en SN - 2228-7817 AU - Behzadtabar, Parya AU - Ghobadi, MohammadHossein AU - Fereidooni, Davood AU - Sepahi, Ali Asghar AD - Department of Geology, Faculty of Sciences, Bu-Ali Sina University, Hamedan, Iran. AD - Department of Geology, Faculty of Sciences, Damghan University, Damghan,Iran. Y1 - 2019 PY - 2019 VL - 9 IS - 2 SP - 265 EP - 277 KW - Salt crystallization KW - Natural weathering KW - Anisotropy KW - Calcareous slate KW - Arak DO - 10.22059/geope.2019.260836.648399 N2 - Salt crystallization can severely damage anisotropic foliated rocks, therefore it is necessary to have an understanding of crystallization process. The present study was conducted to investigate the effect of salt crystallization on Arakʾs calcareous slates, as anisotropic rocks of Mesozoic. To compare salt crystallization weathering (EN 12370 norm was used up to 30 cycles) with natural weathering conditions, some samples were exposed to natural weathering conditions for 12 months. The samples exposed natural condition were tested every 3 months. The measurements show a decrease in physical and strength properties with an increase salt crystallization cycles. At the end of cycle 30, the average weight, ultrasound wave velocity, uniaxial compressive strength (σc), Brazilian tensile strength (σt), and point load index value (Is) of the samples were reduced by 0.32%, 11.52%, 23.72%, 32.15%, and 16.09%, respectively. In comparison, after about 12 months of exposure to natural climatic conditions, these values were 0.18%, 8.84%, 12.64%, 22.23%, and 15.04%, respectively. To establish a relationship between salt crystallization and natural weathering conditions, weathering ratio (WR) was presented. The results of this study can be used to predict the behavior of the anisotropic slates of Arak, upon which the city is planned to be developed. UR - https://geopersia.ut.ac.ir/article_69666.html L1 - https://geopersia.ut.ac.ir/article_69666_a2b2af050863c5b3b82e5272ced4b688.pdf ER -