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http://dx.doi.org/10.11112/jksmi.2016.20.6.065

Effect of Time-dependent Diffusion and Exterior Conditions on Service Life Considering Deterministic and Probabilistic Method  

Kwon, Seung-Jun (Department of Civil Engineering, Hannam University)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.20, no.6, 2016 , pp. 65-72 More about this Journal
Abstract
Service life evaluation for RC Structures exposed to chloride attack is very important, however the previous two methods(deterministic and probabilistic method) show a big difference. The paper presents a service life simulation using deterministic and probabilistic method with time-dependent diffusion coefficient. Three different cases are considered for diffusion coefficient, concrete cover depth, and surface chloride content respectively, and then the PDF(probability of durability failure) and the related service life are obtained. Through adopting time-dependent diffusion, the discrepancy between the two methods can be reduced, which yields reasonable service life. When diffusion coefficient increases from $2.5{\times}10^{-12}m^2/sec$ to $7.5{\times}10^{-12}m^2/sec$, the service life decreases to 25.5~35.6% level, and cover depth does from 75 mm to 125 mm, it increases to 267~311% level as well. In the case of surface chloride content from $5.0kg/m^3$ to $15.0kg/m^3$, it changes to 40.9~54.5%. The effect of cover depth is higher than the others by 8~10 times and also implies it is a key parameter to service life extension.
Keywords
Chloride attack; Service life; Diffusion coefficient; Surface chloride content; Cover depth;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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