A Rational Model to Predict the Service life of RC Structures in Marine Environment n Marine

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Title: A Rational Model to Predict the Service life of RC Structures in Marine Environment n Marine

Author(s): K. Yokozeki, K. Motohash and T. Tsutsumi IK. Okada

Publication: Special Publication

Volume: 170

Issue:

Appears on pages(s): 777-796

Keywords: Chlorides; corrosion; cover; cracking (fracturing); diffusion; durability; mix proportioning.

Date: 7/1/1997

Abstract:
In this paper, an analytical model to predict the service life of reinforced concrete (RC) structures in marine environment is proposed. For constructing a model, the deterioration process of RC structures was assumed to be divided into two stages: the penetration period of chlorides into concrete and the ensuing cracking stage due to corrosion of reinforcement. Two indices, TO and T1, were introduced in this model: the latent period from the beginning of the chloride penetration until the onset of corrosion, denoted as TO, and the progressive period until the initiation of the longitudinal cracking, denoted as Tl. Since the TO model was already described in the previous report, Proposed durability design for RC marine structures CONSEC ‘95 (4) modeling of Tl and a rational service life prediction using a combination of TO and T1 are discussed in this paper. The T1 model was constructed by a parametric study using Finite Element Method, after investigating the effect of finite element layout. In the analytical study, parameters were determined considering the experimental results obtained from exposure tests. The results of parametric study were combined in the regression analysis. An attempt has also been made to discuss some experimental results in the light of the proposed model. Finally, a program (called MS LIFE), which predicts the service life of RC structures in a marine environment was proposed by combining the model for predicting the T1 with that for TO. Some results of the trial calculation using this model were also introduced for verification.