Practices for Ensuring the Smoothness of Concrete Bridge Decks (2022) / Chapter Skim
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Pages 26-38
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From page 26... ...
26 This chapter presents the results from the survey that was sent to state DOTs. The information obtained from the survey is presented in the following three sections in this chapter: • Smoothness Practices for Bridges: This section presents the state DOT practices for evaluating the smoothness of the finished concrete bridge deck after construction.
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State of the Practice 27 Smoothness Not Evaluated Two state DOTs (5% of responding DOTs) , which are DOTs in Indiana and New Hampshire, indicated they do not have a smoothness requirement for a finished concrete bridge deck.
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28 Practices for Ensuring the Smoothness of Concrete Bridge Decks Smoothness Evaluated with a Rolling Straightedge The Kansas, Kentucky, and Missouri DOTs (7% of responding DOTs) indicated they use a rolling straightedge to check the smoothness of a new bridge deck.
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State of the Practice 29 Smoothness Evaluated Using the International Roughness Index Overview Six state DOTs (15% of responding DOTs) indicated they use an IRI-based smoothness specification for concrete bridge decks.
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30 Practices for Ensuring the Smoothness of Concrete Bridge Decks Functional Class of Highways on which the Bridge is Located and Speed Limit The smoothness specification did not vary based on the functional class of the roadway on which the bridge is located except in the Michigan DOT and Tennessee DOT specifications. The Michigan DOT smoothness specification is applied when the bridge is on a highway system where the speed limit is more than 50 mph.
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State of the Practice 31 intervals for all travel lanes on the bridge. The draft specification developed by Louisiana DOT indicates MIRI computed at 264-ft.
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32 Practices for Ensuring the Smoothness of Concrete Bridge Decks The localized roughness criterion used by Michigan DOT is based on a straightedge, where surface irregulates must be less than ⅛ in. The localized roughness criterion used by Minnesota DOT is based on a profilograph simulation that is performed on data collected by an inertial profiler to detect bumps.
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From page 33... ...
State of the Practice 33 Although a state DOT may not have a negative pay adjustment, the contractor is required to correct the bridge surface to meet the MIRI or localized IRI criterion or both as applicable in the state DOT specification. The method of correction of the surface is specified in the smoothness specification, and typically involves grinding areas with bumps.
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34 Practices for Ensuring the Smoothness of Concrete Bridge Decks to ¼ in. from the concrete surface, the bridge deck is constructed ¼ in.
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State of the Practice 35 results of the testing for the first pour must be provided to the DOT within 5 days. On subsequent placements, the contractor is required to provide the DOT results for every third placement.
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36 Practices for Ensuring the Smoothness of Concrete Bridge Decks of the profilograph specified by all state DOTs is 25 ft., except for Nebraska DOT, which uses a profilograph 12 ft. long.
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State of the Practice 37 Evaluation of the Roughness Progression of Bridge Decks All state DOTs that store the IRI data of bridges indicated they do not use the IRI data to evaluate the roughness progression of bridges over time. Use of Roughness Data in Decision Trees for Managing Bridges Of the 10 state DOTs that store IRI data on bridges, one state DOT (Ohio DOT)
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From page 38... ...
38 Practices for Ensuring the Smoothness of Concrete Bridge Decks • Placing an AC overlay. • Placing a concrete overlay.
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