What are Nebraska Concrete Barrier Wall Specifications?

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The Nebraska Department of Transportation outlines specifications regarding the proper fabrication, installation and setup of concrete protective barriers.

Nebraska Concrete Barrier General Notes: Fabrication and Installation

The Nebraska Department of Transportation’s general instructions are as follows. Note that these details are for the fabrication and installation of concrete protection barriers, and the details described are typical.

  1. Concrete protection barriers should be made of 5,000 PSI concrete and be precast in accordance with applicable portions of Section 705 in the standard specifications. The forms may be removed when the concrete has attained a compressive strength of 2,175 PSI. The barriers may be transported within the plant once the concrete has attained a compressive strength of 3,000 PSI. The barriers may be shipped when the concrete has attained a compressive strength of 5,000 PSI.

  2. Reinforcing steel used within the concrete should conform to the requirements of ASTM A 615, Grade 60.

  3. The loop reinforcing steel should be smooth, meeting the requirements of ASTM A 706, Grade 60 or ASTM A 615, Grade 60, which has been modified to meet the following physical and chemical requirement:

a. Tensile Requirements

i.	Yield strength: 60,000 PSI minimum

ii.	Tensile strength: 80,000 PSI minimum

iii.	Elongation in 8-inch: 14% minimum

b. Chemical composition (max percents)

i.	Carbon: 0.30

ii.	Manganese: 1.50

iii.	Phosphorus: 0.035

iv.	Sulfur: 0.045

v.	Silicon: 0.50

The loop should pass a 180 degree bend test on a 2-3/4” pin.

  1. The Contractor or supplier should furnish the materials. They should research the manufacturer’s certified test reports for the actual heat of the steel being used that shows the chemical and physical test results for the loop reinforcing steel. This should be done before coating or fabrication begins.

  2. All steel should be zinc-coated as specified below, or epoxy coated to Nebraska standards.

  3. Zinc-coated (galvanized) steel bars should meet the requirements of ASTM A 123, (coating Grade 100, minimum coating of 2.30 ounces per square foot). The bars should be fabricated prior to galvanizing. The procedures of ASTM A 143 should be observed as applicable. All zinc coating damage due to fabrication or handling should be repaired with a zinc dust formulation in accordance with ASTM A 780.

  4. The coating plant intending to supply the loop reinforcing steel should notify the Materials and Research Division two to three weeks before processing any material in order to arrange for NDOT personnel to inspect the materials. This should be done during the coating and fabrication process.

  5. The contractor should provide the engineer a letter certifying the concrete protection barriers for use on this project have been made in accordance with these plans.

Nebraska Concrete Barrier General Notes: On Site Response

The Nebraska Department of Transportation’s general instructions for onsite response processes are as follows:

  1. Concrete protection barriers are the property of the contractor.

  2. The contractor should provide for an approved monitoring schedule, with a person on call and available 24 hours a day, each day of the week, to realign concrete protection barriers that have been struck.

  3. Initiation of this service should be within one hour of notification of need.

Nebraska Concrete Barrier General Notes: Specifications

The Nebraska Department of Transportation’s general instructions for barrier specifications are as follows:

  1. Use 1-1/8” diameter ASTM A 307 anchor bolts with heavy hex nut and washer (A36). Use ASTM A36 non-coated steel for the connection pin.

  2. In regards to surface preparation, when place on a paved surface, all loose dirt and sand should be removed from the roadway prior to placement of the barrier.

  3. Barriers must be pulled tight during installation to remove slack.

  4. At no time should be barriers be lifted by use of the loop bars.

This blog post is an interpretation of specifications by the Nebraska Department of Transportation. Please consult with Nebraska DOT's most recent requirements for definitive information.

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