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- W1486162562 abstract "The purpose of this investigation was to examine the suitability of more advanced transport models for chloride analysis, and of operator-independent procedures, to improve the accuracy of the analysis of chloride data from field extracted cores and related durability projections. The work conducted involved formulating the transport processes in concrete, examining alternative methods for sampling and analysis, and developing appropriate improved procedures. A user-friendly computer spreadsheet program was developed using those procedures. Alternative approaches to fitting slice data were developed, capitalizing on the observation that many profiles still maintain a root of dependence even if not reflecting simple diffusion. These techniques permit forward prediction of chloride intrusion, and with chloride binding information may provide much improved durability estimates. The effect of surface layers which produce peaks in the profile data was investigated also. Relatively simple modeling was found to provide a satisfactory estimate of the chloride profile. Modeling indicates that the carbonation/release mechanism had little or no effect on the total chloride profile ahead of the carbonation front, so that a square root of time dependence of the profile shape is maintained, facilitating durability projection. Core slicing strategies to optimize the prediction of chloride intrusion and minimize costs associated with analysis were developed. Chloride profile fitting procedures including time dependent diffusion and cylindrical geometries were examined. It was tentatively concluded that cores cut from typical cylindrical piles can be analyzed by assuming planar geometry. A new fitting procedure to include chloride binding was developed. If the potential for physico-chemical binding exists, the choice of a model for chloride intrusion will be impacted. It was concluded that in the presence of binding the simplified (Fickian) analysis will produce conservative (but not accurate) predictions of time to corrosion initiation. An advanced binding model was developed and tested, which produces binding parameter information from a total chloride profile alone." @default.
- W1486162562 created "2016-06-24" @default.
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- W1486162562 date "2003-01-31" @default.
- W1486162562 modified "2023-09-26" @default.
- W1486162562 title "ADVANCED ANALYSIS OF CHLORIDE ION PENETRATION PROFILES IN MARINE SUBSTRUCTURE" @default.
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