What are the Alabama Previously Cast Concrete Barrier Type 6 (Portable) Specifications?

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The Alabama Department of Transportation outlines specifications regarding the proper dimensions for previously cast concrete barriers, type 6 (portable), including general notes, elevation view specifications, connector pin assembly, section A-A and B-B specifications, hex head machine bolt details, lift hook details and joint connector details.

Alabama Previously Cast Concrete Barrier General Notes

  1. All information included below applies to barriers cast prior to 1/01/2020. Barriers cast after this date should be MASH compliant. There will be an interim phase-in period for the new barrier, during which this old barrier will be allowed. The MASH, TL-3 barrier and previously cast barriers are not interchangeable and should not be intermixed in a continuous run of barriers.

  2. Supply one connector pin assembly with each 10’ barrier section.

  3. The contractor is responsible for checking the tightness of the 1-1/4” hex nut at both ends of the 1-1/4” diameter bolt to ensure that no hex nut comes loose during the duration of its use on the project.

  4. Fluorescent reflectors (6” x 6”, ASTM Type XI reflecting sheeting mounted on flatsheet blanks) should be attached to the top of the barrier at intervals not greater than 40 feet in longitudinal sections and 20 feet in tapered sections. The reflective color should match the adjacent traffic stripe color. The reflectors should be mounted approximately two inches above the top of the barrier and should be attached to the barrier with adhesive or by a drilled-in anchor type device. If the barriers are used in a two=-way traffic situation, then the reflectors should be installed for both directions of traffic. Cost of the reflectors and mounts should be a subsidiary obligation of the concrete barrier, Type 6.

  5. All barrier segments should be marked as shown: ALDOT, 350, TL-3 and Year Cast. The markings should be permanently impressed in the barrier using a minimum of 2” high lettering.

  6. Barriers should initially be placed closed together (closed joint) so that the pin can be easily inserted through the hinge bar loop. The barriers should then be opened (open joint) before the nut is tightened on the pin.

  7. All deformed reinforcing bars should be Grade 40 or 60 AASHTO M31 or ASTM A615.

  8. Alternate NCHRP 350, TL-3 portable barrier designs that have been approved by the ALDOT product evaluation board may be considered for use through submittal to the state construction engineer in accordance with section 740.02(c) 3 of the ALDOT Standard Specifications for Highway Construction, 2012 Edition.

Alabama Previously Cast Concrete Barrier Elevation View Specifications

Barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT end view specifications:

  • Length: 10’

  • Height: 32”

  • Two lift hooks, each protruding 3” from the top of the barrier

  • One loop bar on the right with a ¾” diameter hinge; the top of the loop bar should protrude 7-3/8” from the top of the barrier, and the bottom of the loop bar should protrude 9-3/8” from the ground line.

  • One loop bar on the left with a ¾” diameter hinge; the top of the loop bar should protrude 8-1/8” from the top of the barrier, and the bottom of the loop bar should protrude 8-1/8” from the ground line.

  • One drainage and lifting slot that is 4’-0” long, centered on the barrier. Each end of the lifting slot should be positioned 3’-0” from each edge of the barrier. The lifting slot should be 2” high.

  • No. 5 Bar A positioned horizontally at the bottom of the panel and no. 5 Bar B positioned horizontally at the top of the panel

  • No. 3 Bar A positioned vertically throughout the panel, spaced at the following intervals from left to right, starting at the end of the panel: 6”, 6”, 6”, 1’-7”, 1’-7”, 1’-7”, 6”, 6”, 6”

Alabama Previously Cast Concrete Barrier Connector Pin Assembly

Connector pin components should meet the following material specifications:

  1. Pin-AASHTO M314 Grade 36 Minimum

  2. Alternate hex head machine bolt – ASTM A307 Grade A

  3. Nut – ASTM A563 Grade A Heavy Hex

  4. Washer – ASTM F436 Type I

  5. All components must be hot dip galvanized – ASTM A153

Alabama Previously Cast Concrete Barrier Section A-A Specifications

Barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT Section A-A specifications:

  • Height: 32”

  • Bottom length: 24”

  • Top length: 6”

  • Reflector positioned on top

  • Reflector dimensions: 6” x 6”

  • Bar B #5 REINF BAR located inside the barrier

  • Bar A #3 REINF BAR located inside the barrier

Alabama Previously Cast Concrete Barrier Section B-B Specifications

Barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT Section B-B specifications:

  • Height: 32”

  • Bottom length: 24”

  • Top length: 6”

  • Drainage slot height: 3”

  • ¾” top chamfer or radius

  • Break point: 13” from ground line

  • Height of top slope: 19”

  • Height of bottom slope: 10”

Alabama Previously Cast Concrete Barrier Hex Head Machine Bolt Details

Hex head machine bolts should conform to the following dimensions:

  • Length: 2’-0”

  • 1-1/4” diameter

  • 1-1/4” washer on each end

  • 1-1/4” heavy hex nut on the outside of the washer on each end

  • 5” threading for threaded bolt and 6” for machine bolt

Alabama Previously Cast Concrete Barrier Lift Hook Details

Lift hooks should conform to the following dimensions:

  • Height: 2’-1-1/4”

  • Bottom width: 18”

  • Length of each bottom side: 7”

  • Length of central space: 4”

  • Loop radius: 2”

  • Made from #4 rebar-AASHTO M31 Grade 40 or 60; or ASTM A615 Grade 40 or 60 or:

    o ½” 250 or 270 KSI steel strand uncoated

    o Seven-wire for concrete reinforcement: AASHTO M203 or ASTM A416

    o Two required per curb section

Alabama Previously Cast Concrete Joint Connection Details

Joint connections should conform to the following dimensions:

Open Joint

  • Max gap: 1-3/4”

  • ¾” diameter hinge bar

  • 2” radius cast into the end of the barrier

  • 1-1/4” diameter central high strength bolt

Closed Joint

  • Max gap: ¼”

  • ¾” diameter hinge bar

  • 1-1/4” diameter central high strength bolt

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

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