What are Maine Permanent Concrete Barrier Type IIIA Specifications?

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The Maine Department of Transportation outlines specifications regarding the proper dimensions for permanent concrete barriers Type IIIA, including general notes, plan view details, elevation details, and more.

Maine Permanent Concrete Barrier General Notes

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

  1. All work and materials should conform to the provisions of Standard Specifications Section 526 - Concrete Barrier.

  2. Reinforcing bar designations Type "S" and "CB" refer to type bending diagrams as shown on the main Reinforcing Steel Schedule. These bars are detailed on the Design Drawings and are included for payment in the Reinforcing Steel pay items.

  3. Reinforcing steel should have a minimum concrete cover of 1-½”, except that stirrups Type "S" and "CB" should have a minimum concrete cover of 2”.

  4. The first digit following the letters of the mark indicates the size of the reinforcing bar. (FA600 = #6 bar.) All dimensions are out-to-out of bar.

  5. Minimum lap splice lengths are 1’-9" for FA500 and 2’-7" for FB700.

  6. The quantities of reinforcing bars shown are for one barrier end only.

  7. Bolt holes in concrete should be formed by a method approved by the Resident.

  8. Payment for anchor bolts and bearing plates will be considered incidental to the concrete barrier pay item. Class 8.8.3 bolts should be used when corrosion-resistant steel guardrail is specified on the approach roadway.

  9. Permanent Concrete Barrier is designed for attachment of Bridge Transition Type "1" unless otherwise indicated on the Design Drawings. Refer to Section 606 for details.

  10. After installation of the guardrail is complete, upset the threads on the anchor bolts in three places around each bolt, at the junction of the nut and the exposed thread, with a center punch or similar tool.

  11. If there is a conflict between these Standard Details and the Design Drawings, the requirements of the Design Drawings should be followed.

Maine Permanent Concrete Barrier Specifications

Maine barriers should conform to the following specifications, according to the Maine Department of Transportation:

Plan View (Type IIIA)

Barriers include an 8” bearing plate on the side of the barrier, set 1’-8” away from the end of the barrier. The bearing plates include a 1” diameter hole for a 7/8” diameter x 10” H.S. bolt with a washer and nut. Barriers measure 11” wide (on the flat side), plus 5” wide (on the inclined side) for a total of 16” in width. The inclined side of the barrier measures 2’-0” long before flattening out again.

Elevation View (Type IIIA)

Barriers include a 1” chamfer. Starting from right to left, there are:

  • 12 ~ FA501 (5 equal spaces E.F.)

  • 1 ea. FA550, FA551 (N.F.)

  • 2 ~ FA501 (F.F.)

  • 10 ~ FA600 (5 @ 6” E.F.)

  • 5 ~ Type “s” #6 sp. @ 6”

  • 4 ~ FA650 @ 6”

  • 4 ~ Type “CB” #6 @ 6”

  • FA650 @ 12”

  • Type “CB” #6 @ 12”

  • 10 ~ FA500 (5 F.E.)

Typical Barrier Section (Type IIIA)

Barriers measure 8-1/2” wide at their shortest point and 1’-4” wide at their widest point. They include FA650, FA500 and #6 type “CB” bars. They are 2’-8” tall. The height of the bottom slope is 7” and the height of the upper slope is 1’-10”.

Table of Dimensions – Type IIIA

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

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