نوع مقاله : مقاله پژوهشی
استادیار، دانشکده صنعت و معدن، دانشگاه یاسوج، چرام، ایران
عنوان مقاله [English]
Reinforcement corrosion is one of the most important factors in reducing the strength and destruction of concrete structures during the lifetime of the structure. Various service life prediction models based on laboratory experiments or numerical analysis are used to predict the behavior of concrete structures in aggressive environments. Models that predict the time to cover cracking induced by corrosion are among the most important service life model in concrete structures. These models have some errors due to the influence of environmental factors and also the existence of uncertainties in the concrete properties. In this study, the effect of environmental conditions that are usually applied in regulations by increasing the thickness of the concrete cover was investigated on existing models. In addition to the concrete cover, the effect of other environmental parameters such as corrosion intensity was also investigated. The effect of uncertainty is applied by applying coefficients of variation to the parameters. The results show the effect of uncertainty of the amount of corrosion current density on the average value of crack initiation time so that by increasing the coefficient of variation of this variable, the predicted time for the occurrence of crack increases. this overestimated time is not conservative. The results also revealed that if the maximum ratio of concrete cover to rebar diameter (c/D) is selected in any environmental conditions, the crack initiation time can be delayed approximately 4.3 times.