What are Alaska F-Shape Concrete Barrier Specifications?

Tips & Advice

The State of Alaska Department of Transportation outlines specifications regarding the proper dimensions for F-shape barrier walls, including construction notes, elevation details, end view details, pin details and connector details.

Alaska F-Shape Concrete Barrier Construction Notes

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

  1. This concrete barrier meets MASH TL-3 and may be used for temporary and permanent applications.

  2. Use Class B-B concrete (5,000 psi) meeting the requirements of Section 550 of the Standard Specifications.

  3. Provide the following unobstructed smooth deflection area behind barrier:

a. 18” when anchored to concrete

b. 22” when anchored to asphalt pavement

c. 64” when unanchored

  1. When anchored, install anchor pins on the side facing traffic. Concrete barrier used as permanent median barrier in medians less than 8’ in width should be anchored to the roadway with anchor pins on both sides of the barrier.

Alaska F-Shape Concrete Barrier Elevation Details

F-shape barriers in Alaska should conform to the following dimensions and include the following features, according to the State of Alaska Department of Transportation’s elevation view specifications:

  • Barrier height: 32”

  • Loop bar diameter: ¾”

  • Pin slot dimensions: 1-7/8” x 4”

  • Lifting slots: 3” (typ.)

  • Distance between edge of panel and start of lifting slot: 31-1/2” (typ.)

  • Distance between bottom of panel and bottom loop bar (left side): 6”

  • Distance between bottom loop bar and middle loop bar (left side): 4”

  • Distance between middle loop bar and top loop bar (left side): 14”

  • Distance between top loop bar and top of panel (left side): 8”

  • For the right side of the panel, the loop bar measurements outlined above should be inverted

Alaska F-Shape Concrete Barrier End View Details

F-shape barriers in Alaska should conform to the following dimensions and include the following features, according to the State of Alaska Department of Transportation’s end view specifications:

  • Bottom width: 24”

  • Top width: 9-1/2”

  • Vertical reveal: 3”

  • Break point: 10” from ground line; 10” R. (typ.)

  • ¾” chamfer

  • Panel height: 32”

Alaska F-Shape Concrete Barrier Pin and Connector Details

F-shape barriers in Alaska should conform to the following dimensions and include the following features, according to the State of Alaska Department of Transportation’s specifications:

Stirrup Bar

Each #4 stirrup bar should measure 14-7/8” wide on the bottom, 10-3/4” wide on the top, and 27” long. The bottom bar lap should be 12” wide. The radius of the bottom bar corners should be 1-1/2”.

Pin Slot Bar

Each #4 pin slot bar should measure 6-3/8” wide and 22” long with an inner radius of 1-1/2” (typ.).

Loop Bar

Each loop bar should be hop dip galvanized after fabrication and should be ASTM A123 or AASHTO M 111. Loop bars should have a diameter of ¾”, a length of 33-3/4”, and a width (distance between the two open ends) of 2”.

Longitudinal Bar

Longitudinal bars should measure 12’-0” in length.

Pin Loop Detail

Pin loops should extend from the barrier by 2”. The loop bar should be ¾” in diameter.

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

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