What are Iowa Precast Concrete Temporary Barrier Specifications?

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The Iowa Department of Transportation outlines specifications regarding the proper dimensions for precast concrete temporary barriers, including general notes, elevation view details, plan view details and section details.
Iowa Precast Concrete Temporary Barrier General Notes

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

  1. For loop bars 6d1, 6d2, and 6d3, use ¾” smooth steel bars with a minimum yield strength of 60 ksi, a tensile strength of not less than 1.25 times the yield strength but a minimum of 80 ksi, a minimum 14% elongation in 8 inches, and passing a 180 degree bend test using a 3-1/2” pin bend diameter.

  2. Install loops within 1/8” of the plan dimensions.

  3. Use Grade 60, ASTM A615 for all other reinforcements. Do not lift or move using loop bars 6d1, 6d2 or 6d3.

  4. Provide for an approved monitoring schedule with a person on call and available 24 hours a day, each day of the week, to realign barrier which has been struck. Initiate service within one hour of notification of need.

  5. Unless stated otherwise in the plans, the barrier rail sections should be the property of the Contractor. Remove from the site upon completion of work.

  6. Following removal of anchorage, fill all holes with an approved non-shrink grout.

  7. Tapered end section is not designed for use within 30 feet of traffic on facilities with speed limits 55 mph or greater, nor within 10 feet of traffic on facilities with speed limits 40 mph to 50 mph.

  8. Estimated quantity of concrete for one taper section is 0.6 cubic yards.

  9. Include the cost of anchorage, when required in the price bid for "Temporary Barrier Rail, Concrete.”

  10. Permanently mark one end of each rail section with manufacturing information. The “marked end” is that end of the barrier having one loop bar at the top and two loop bars at the bottom. Include the following information in the marking:

a. Manufacturer Identification

b. Date Manufactured (Month and Year)

c. BA-401 Type A

Iowa Precast Concrete Temporary Barrier Elevation Details

Precast concrete barriers in Iowa should conform to the following dimensions and include the following features, according to the IDOT elevation view specifications:

  • Length: 12’-6”

  • Height: 32”

  • Corners: ¾” chamfer

  • On the right side, the distance between top of barrier and first loop bar should be 6”; the distance between top loop bar and middle loop bar should be 3”; the distance between middle loop bar and bottom loop bar should be 17”; the distance between bottom loop bar and bottom of the barrier should be 6”

  • On the marked end, the distance between top of barrier and first loop bar should be 7-1/2”; the distance between top loop bar and middle loop bar should be 17”; the distance between middle loop bar and bottom loop bar should be 3”; distance between bottom loop bar and bottom of the barrier should be 4-1/2”

  • There should be 3-3/8” plus or minus 1/8” measured from the face of the rail to the outside edge of the loop bar

  • Each barrier should include two symmetrical lifting slots that are 3” high

Iowa Precast Concrete Temporary Barrier Plan and Section Details

Blockout Spacing

The IDOT outlines the blockout spacing of bars based on the barrier plan view. From left to right, starting at the left end of the barrier, blockout spacing should go as follows: 24”; 4’-3”; 4’3”; 24”. Furthermore, each barrier length should be 12’6” and the barrier width should be 22-1/2”.

Section A-A

Details for section A-A are as follows:

  • Height: 32”

  • Bottom width: 22-1/2”

  • Top width: 8”

  • Chamfer: ¾”

  • Bottom slope height: 7”

  • Top slope height: 22”

  • Vertical reveal: 3”

Section B-B

Details for section B-B are as follows:

  • 1” clear to 6a2 bar

  • 1-3/4” minimum clear between bar and outside of panel

  • 1” radius allowed

  • Distance between ground line and 2-5b1: 6-1/2”

  • Distance between 2-5b1 and 2-4c1: 8”

  • Distance between 2-4c1 and 1-5b1: 14-5/8”
    • Distance between 1-5b1 and top of panel: 2-7/8”

Section C-C

Details for section C-C are as follows:

  • 1” clear to 6a2 bar

  • 1-3/4” minimum clear between bar and outside of panel

  • 1” radius allowed

  • Distance between ground line and 2-5b1: 6-1/2”

  • Distance between 2-5b1 and 2-4c1: 8”

  • Distance between 2-4c1 and 1-5b1: 14-5/8”

  • Distance between 1-5b1 and top of panel: 2-7/8”

  • Minimum distance required between 1-5b1 and top of panel: 2”

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

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