Temporary Precast Barrier Wall Specifications in Ohio
Ohio has very particular, fairly stringent regulations when it comes to approved barrier walls. Barrier walls from other states are strictly not approved for use in the state. This means that, although approved barriers look very similar to Jersey shape barriers used in other states, the Ohio Department of Transportation (ODOT) mandates specific design requirements for their precast concrete barrier walls. ODOT has marked all compliant precast concrete barrier walls with “350,” indicating that they adhere to the requirements laid out in the National Cooperative Highway Research Program's Report 350. Without this marking, a barrier wall is not approved for use in Ohio. Any barrier walls that were used prior to 2008 that did not meet requirements have been phased out. Additionally, even if a barrier wall from another state meets Report 350 requirements, it should not be used in Ohio unless it has been marked by the department.
Currently, there are three types of precast concrete barrier walls that have the greenlight from ODOT:
1. 32-inch barrier (RM – 4.2) – This barrier wall is either made with concrete and reinforcing steel or welded wire fabric. The strength of its concrete must be at least 4,000 psi. This barrier wall is not approved for use on bridge deck edges. Its ¾-inch hinge bars must be ASTM A 36. Its rebars need to meet ASTM A 615, Grade 60 requirements. Additionally, all bolts, washers, and hex nuts used in the construction of the barrier wall must be galvanized. All RM – 4.2 barrier walls should be marked with the year cast and marked with “WWF” if welded wire fabric was used instead of rebar.
2. 50-inch barrier (RM – 4.1) – Many of the specifications beyond size of the approved 50-inch barrier are similar to the specifications for the approved 32-inch barrier. The concrete must be at least 4,000 psi in strength. Rebar or approved welded wire fabric may be used. If welded wire fabric is used, it must be labeled on the barrier wall. Its hinge bars need to be ASTM A 36, and its rebar needs to be ASTM A 615, Grade 60. Washers, bolts, and nuts must be galvanized. One thing to note is that if 50-inch barrier wall is attached to 32-inch barrier wall, ODOT-approved Impact Attenuators need to be used.
3. J-J Hooks PCB – This is a New Jersey shape barrier wall specifically manufactured for use in Ohio by the company, J-J Hooks, using Easi-Set’s specs to meet Report 350 TL-3 requirements. This barrier wall must be made with a third rebar, and it needs to have been manufactured after 1999. All approved JJ-Hooks precast concrete barrier wall is stamped with “350.”
Note: For in-depth details about necessary measurements for both 32-inch barrier and 50-inch barrier in Ohio, please consult ODOT's official specifications.
ODOT has also recently released a draft with specifications for a new, approved F-shape barrier. It is a Manual for Assessing Safety Hardware (MASH) compliant concrete barrier. The design of this barrier wall is based on recommendations by the American Association of State Highway and Transportation Officials (AASHTO) in their official manual. This new barrier type will help reduce damage to vehicles and to the barrier wall itself. ODOT seems to still be outlining the specifics of this new concrete barrier wall in terms of their regulations, but they recently published a draft outlining some of its features.
As a substitute for precast concrete barrier wall, some specific steel barrier types are allowed in Ohio. These include the Zoneguard Steel Traffic Barrier and the Vulcan Barrier, which is a portable steel longitudinal barrier. For more information about approved substitutes, consult ODOT's guidelines.
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