LRFD Metal Loss and Service-Life Strength Reduction Factors for Metal-Reinforced Systems (2011) / Chapter Skim
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Pages 42-47
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From page 42... ...
The spatial distribution of corrosion rates appears to be random, although spatial trends are apparent from data obtained with respect to several of the sites in the database. No significant differences are observed between different climates for galvanized elements, however, marine environments had a detrimental effect on corrosion rates for plain steel (i.e., not galvanized)
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From page 43... ...
The protocol for sampling and electrochemical testing of wall fill, described in Table 4, is recommended to assess fill quality and if the materials meet the criteria for good or high quality fills. Although the calibrations resulted in different resistance factors depending on use of the simplified or coherent gravity methods for computing nominal load, use of the same resistance factor is recommended for either method.
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From page 44... ...
However, data on the performance of plain steel reinforcements were analyzed, statistics on metal loss were generated, and resistance factors for use in LRFD were calibrated. The objectives of the study are to present differences with respect to design with galvanized reinforcements.
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From page 45... ...
This example demonstrates how the statistics generated from metal loss measurements can be used to calibrate resistance factors for LRFD of Type II reinforcements. However, the computed resistance factor is sensitive to the lock-off load, and depends on the sizes and steel types of the reinforcements.
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From page 46... ...
It should be noted that most of the data in this group are associated with reinforced fills that meet AASHTO requirements by a wide margin. • For reinforced fills conforming to AASHTO criteria, marine environments have minor to no effect on measured corrosion rates of galvanized reinforcements, but marine environments accelerate corrosion rates of plain steel reinforcements.
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From page 47... ...
2. Compare measurements of corrosion rates with direct observations of metal loss from reinforcements that have been exhumed subsequent to LPR measurements.
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