%0 Journal Article %T Predicting the long-term durability of limestones subjected to freeze–thaw cycles (case study: Guilan province, north of Iran) %J Geopersia %I University of Tehran %Z 2228-7817 %A Dehban avan estakhri, Maryam %A Ghobadi, MohammadHossein %A Mohseni, Hassan %D 2021 %\ 11/01/2021 %V 11 %N 2 %P 377-397 %! Predicting the long-term durability of limestones subjected to freeze–thaw cycles (case study: Guilan province, north of Iran) %K Mesozoic limestone %K freezing-thawing %K decay value %K damage variable %K wing crack %R 10.22059/geope.2021.317876.648597 %X Mesozoic limestones with Cretaceous and Jurassic age are widely seen in the Guilan province, north ofIran. Regarding the climate of this area, the development of limestone with a high percent of CaCO3(rather than 80%) and karst morphology development was investigated to evaluate the effect of freezingthawing (F-T) cycles concerning the karst development. In this way, the physical and mechanicalproperties of the four lithology units (Kl1, Kl2, Km2, and Jkl) were assessed before and after F-T cyclesto study the weathering effects. The survey of the petrography of rocks shows that the samples weregrainstone and packstone type, according to Donham classification. The highest deterioration occurredin sample Kl2 after 60 F-T cycles. The physical and mechanical properties of rock samples such as ɣ(unit weight), wa (water absorption), Pv (P-wave velocity), and UCS (uniaxial compressive strength) forboth dry and saturated conditions, and after 60 cycles of freezing-thawing (F-T) were attained. Thesoftening coefficient (K1) and freezing coefficient (K2) of samples were calculated using the UCSvalues. The F-T cycles caused significant losses in the UCS values. The measured Vp during the F-Tcycles provided a suitable tool for calculating the damage value and decayed constant (λ). This studyshowed that the F-T test is capable of creating microcrack and fractures within the rock as the initialfactors for increasing the contact surface in the dissolution process. The increase in Dn (damagevariable), porosity, water absorption, and decrease of Vp after 60 F-T cycles confirm this result. Also,the increase in tangent Young’s modulus and decrease in strain show that the samples were brittle after60 F-T periods. Therefore, it is concluded that the freezing and softening coefficient and Vp are effectivetools for assessing the rock damage during F-T periods.  %U https://geopersia.ut.ac.ir/article_80864_db72219e52f99f7a52ca00f2f118f583.pdf