What are Maryland Precast Temporary 32 Inch F-Shape Concrete Barrier Specifications?

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The Maryland Department of Transportation outlines specifications regarding the proper dimensions for precast F-shape concrete barriers, including general notes, plan details, pin details and reinforcement details.

Maryland F-Shape Barrier General Notes

The Maryland Department of Transportation’s general instructions are as follows:

  1. This barrier should be used in combination with traffic barrier W Beam as shown on Standard MD 605.45 or traffic barrier W Beam median barrier as shown on Standard MD 104.01-62.

  2. The precast temporary concrete traffic barrier terminal end should be cast using concrete mix No. 6 (4,500 PSI).

  3. Reinforcements:

a. 6x6 W2.9 x W2.9 welded wire fabric folded in a U shape

b. Two No. 4 ½” diameter reinforcement bars that are Grade 60 and each 11’-4” long.

  1. One connector pin should be furnished with each barrier.

  2. The cost of the connector pin should be incidental to the contract price per each for precast temporary 32 inch F-shape concrete traffic barrier terminal ends.

Maryland F-Shape Barrier Plan Details

Precast concrete barriers in Maryland should conform to the following dimensions and include the following features, according to the Maryland Department of Transportation’s specifications.

  1. Barriers should be 32” high and 12’-8” long.

  2. They should include two lift anchor that can hold a minimum of four tons each.

  3. Payment is required for each precast temporary F-shape concrete traffic barrier terminal end.

  4. Each barrier should include formed bolt holes that are 1” in diameter.

Maryland F-Shape Barrier End and Reinforcement Details

Precast concrete barriers in Maryland should conform to the following dimensions and include the following features, according to the Maryland Department of Transportation’s end view specifications.

End A

  • Bottom width: 24”

  • Top width: 10”

  • Height: 32”

  • Break point: 10” from ground line

  • Upper slope offset: 2”

  • Lower slope offset: 7”

These measurements are typical for the 1’-0” length at end A of the barrier.

End B

  • Bottom width: 18”

  • Top width: 9:

  • Height: 32”

  • Bolt hole diameter: 1”

  • Vertical reveal: 3”

Reinforcements
Reinforcements include a 6x6 – W2.9xW29 welded wire fabric running through the barrier, folded in a U shape. The distance between the wire and the top of the barrier should be 2” CL. TYP. and the distance between the wire and the bottom of the barrier should be 3” CL. TYP.

Protruding from the left side of the barrier are two connector loops (to receive the connector pins), which are spaced 1’-6” apart. The top connector loop is spaced 8” from the top of the barrier, and the bottom connector loop is spaced 6” from the bottom of the barrier.

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

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