What are the Alabama 350 TL-3 Previously Cast Concrete Barrier, Type 6 Specifications?

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The Alabama Department of Transportation outlines specifications regarding the proper dimensions for 350 TL-3 previously cast concrete barriers (type 6, bolted through a bridge deck, portable), including general notes, elevation view specifications, details for barrier sections A-A, B-B and C-C, and more.

Alabama 350 TL-3 Previously Cast Concrete Barrier General Notes

  1. All deck spalls that occur as a result of drilling through the deck in order to install anchor bolts or as a result of removing anchor bolts once temporary barriers are removed should be repaired to the satisfaction of the engineer. Proposed materials and methods to be used in making these repairs should be submitted to the engineer for approval. All costs associated with repairing spalled concrete in bridge deck should be considered a subsidiary obligation of pay item, 726-A, portable concrete safety barrier, type 6.

  2. If the barrier is to be positioned such that a girder prevents bolting through the bridge deck, then anchor bolts should be installed in accordance with procedure provided in the details below. If the traffic side bolt cannot be bolted through the deck due to grider, then both sides of the barrier should be bolted.

  3. All holes drilled through the bridge deck should be filled with an approved epoxy grout after removal of the temporary barrier. If the anchor bolt was drilled and epoxied, the remaining anchor bolt should be cut below the top of the deck and filled with an approved epoxy.

  4. All costs for materials, equipment, tools, labor and incidentals to install and remove anchors and to patch the deck with epoxy grout should be included in the unit price bid for pay item 726-A, portable concrete safety barrier, type 6.

  5. 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, 2018 edition.

Alabama Previously Cast Concrete Barrier Elevation View Specifications

Previously cast concrete barriers in Alabama should conform to the following dimensions and include the following features, according to the ALDOT elevation 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.

  • Two drainage and lifting slots that are each 1’-0” long, positioned 2’-0” away from each other; the beginning of each draining lifting slot should be 3’-0” from either end of the barrier. The lifting slot should be 2” high.

Alabama Previously Cast Concrete Barrier Section A-A, B-B and C-C

Sections A-A, B-B and C-C should conform to the following dimensions and include the following features:

Section A-A

  • Height: 32”

  • Bottom length: 24”

  • Distance from bottom Bar B #5 to the center of the panel: 6”

  • Height from Bar B #5 to Bar A #3: 12-1/2”

  • Height from Bar A #3 to top Bar B #5: 11-1/2”

  • Height from top Bar B #5 to the top of the panel: 2-1/2”
    Section B-B

  • Height: 32”

  • Bottom length: 24”

  • Top length: 6”

  • ¾” chamfer or radius at top

  • Break point: 13” from ground line

  • Height of bottom slope: 10”

  • Height of top slope: 19”

Section C-C

  • Bottom length: 24”

  • One anchor bolt blockout located on either side of the panel

  • Bolt should be installed on traffic side only unless shown otherwise on the plans

  • ½” x 3” x 3” square washer with heavy hex nut used as an anchor bolt; 2” diameter hole in the barrier; 1-1/2” diameter hole in the deck; 1-1/8” A307 hex head anchor bolt

  • 2” minimum between the end of the barrier and the edge of the deck

  • 6” loop bar on each side

Alabama Previously Cast Concrete Barrier Optional Threaded Bolt for Drilled and Epoxy

Optional threaded bolt for drilled and epoxy should conform to the following dimensions:

  • 1-1/2” diameter hole in deck

  • Inserted 7-1/2” deep

  • 2” diameter hole in the barrier

  • 1-1/8” A-307 threaded bolt with heavy hex head nut and washer

  • Filled with grout beginning 1-1/2” below the top of the deck

Alabama Previously Cast Concrete Barrier Bar Bending Details

Stirrups located inside the barrier include three curves that should each be bent to encompass a 2-1/2” diameter. Each side of the upper portion of the stirrup should be bent at a 12-degree angle, while the outside bend should be at a 151 degree angle.

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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