Design Formats for Chloride Service Lifetime Based on Probabilistic Modeling and Analysis

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Title: Design Formats for Chloride Service Lifetime Based on Probabilistic Modeling and Analysis

Author(s): B. J. Leira, O. Skjolsvold, J. Lindgard, and F. Fluge

Publication: Special Publication

Volume: 212

Issue:

Appears on pages(s): 685-700

Keywords: chloride; design format; full-scale measurements; lifetime; probabilistic modeling and analysis

Date: 6/1/2003

Abstract:
The parameters that are relevant for prediction of service lifetime with respect to chloride ingress, are associated with large uncertainties. The present paper summarizes statistical distributions for relevant parameters based on full-scale measurements from the Gimsoystraumen bridge in Norway. A large. number of chloride profiles are available, and for each of these the diffusion coefficient and surface concentration are estimated. Extensive measurements of concrete cover are also performed. These probability distributions are subsequently employed as input to a prediction model for chloride concentration at the steel reinforcement. Since the input parameters are represented in probabilistic terms, the chloride concentration is also a stochastic quantity. The probability of exceeding the critical threshold can accordingly be determined as a function of time. A design format which reflects the statistical properties of the relevant parameters is considered.