Decay Function Models for Long-Term Durability Assessment and Comparison the Effect Freeze-Thaw and Salt Crystallization on the Mechanical Properties of Silver Travertine (Azarshahr, East Azerbaijan)


1 Department of Geology, Lorestan University, Khorramabad, Iran

2 Department of Engineering Geology, Tarbiat Modares University, Tehran, Iran


     In this study, linear and exponential decay function models were proposed, which are based on mechanical properties changes of the Azarshahr silver travertine in freeze-thaw and salt crystallization cycles. From these functions, decay constant and half-life of mechanical properties were determined that for evaluating the long-term durability and to comparison the effect freeze-thaw and salt crystallization cycles be suitable and practical. For this purpose, silver travertine from the Azarshahr quarries was collected. Then, freeze-thaw and salt crystallization tests up to 60 cycles were conducted. After every 10 cycles of freeze-thaw and every 5 cycles of salt crystallization, uniaxial compressive strength, Brazilian tensile strength, point load strength and P-wave velocity of sample were measured. Data analyses show that decay constant and half-time attained from linear and exponential decay function models are in good accuracy for evaluating the durability of sample as well as to comparison the effect freeze-thaw and salt crystallization cycles. Finally, by using these parameters can be avoided performing freeze-thaw and salt crystallization cycles, which are laborious and time-consuming.


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