MnDOT needs MwRSF's opinion on the following Portable F-Shape Concrete Barrier specification (reinforcing bar specification).
We currently specifically the following on our plan (attached):
Reinforcing steel shall be Grade 60 and shall conform to either of the following:
•Epoxy-coated deformed bars as specified in Spec 3301.
• Spec 3301: deformed and plain billet steel reinforcing bars for use with calcium nitrite corrosion inhibitor (30% calcium nitrite solution.)
The spec 3301 is a MnDOT specification concerning Reinforcement Bars (attached).
A question has come up from a manufacturer. They are asking if the epoxy-coated steel reinforcing is required for crash test performance. They are also asking the same question regarding the alternative of using use of corrosion inhibitor in the concrete.
The barrier will not be owned by MnDOT, that is, it will remain the property of the Contractor. The barrier is required (and inspected) to be in good condition every time it’s placed on a MnDOT project, but it will always be the property of the contractor. Therefore, the long term durability and barrier condition risk is transferred to the contractor if they choose a less durable construction method for the barrier (provided that it does not risk the barrier safety performance).
A few of our neighboring states just call out the following:
Use Grade 60, ASTM A615 for these bars.
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