Guide Specification for Service Life Design of Highway Bridges (2020) / Chapter Skim
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Pages 171-174
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NCHRP Web-Only Document 269: Guide Specification for Service Life Design of Highway Bridges 164 C H A P T E R 4 Conclusions and Suggested Research Conclusions The preceding chapters detailed the development of the proposed AASHTO Guide Specification for Service Life Design of Highway Bridges. A comprehensive literature review and survey of industry professionals were performed to gauge the current state of practice of service life design.
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NCHRP Web-Only Document 269: Guide Specification for Service Life Design of Highway Bridges 165 Concrete Structures Chloride-induced Corrosion While the creation of the probabilistically calibrated deemed-to-satisfy provisions in Section 4 of the Guide Specification are an advancement in service life design specifications, there are still a number of unresolved limitations and research needs, as given in the following sections. Reinforcement Critical Chloride Threshold The challenges associated with selecting a value for the critical chloride threshold were introduced in this report, with the large number of influences on the threshold value given in Table 69.
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NCHRP Web-Only Document 269: Guide Specification for Service Life Design of Highway Bridges 166 The threshold influences from Table 69 only pertain to typical mild steel reinforcement. Other types of steel (e.g., stainless)
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NCHRP Web-Only Document 269: Guide Specification for Service Life Design of Highway Bridges 167 Freeze-Thaw and Sulfate Attack The design requirements for the two other limit states in Section 4 of the Guide Specification, freezethaw and sulfate attack, are based on a deemed-to-satisfy provisions from other specifications (e.g., ACI)
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