What are the Mississippi Concrete Median Barrier Specifications?

The Mississippi Department of Transportation outlines specifications regarding the proper dimensions for concrete median barriers, including general notes, plan view details, elevation details, section details and connection details.

Mississippi Concrete Median Barrier General Notes

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

1. Lifting devices and attachments to each barrier should be as approved by the engineer.

2. Place all steel reinforcements at a 2” minimum from the outside face of any wall, except as otherwise shown.

3. The anchor stud connectors should conform to AASHTO M 314, Grade 55. The HSS hex nuts and the hardened round washers should meet the requirements of ASTM A 325.

4. Concrete should be Class B (Class 1 finish). Reinforcing steel should meet the requirements of AASHTO M 31.

5. Steel rods should meet the requirements of ASTM A 36.

6. Connector rods, connector pins, nuts and washers should be galvanized, meeting the requirements of AASHTO M 111.

Mississippi Concrete Median Barrier Specifications

Concrete precast median barriers in Mississippi should include the following features, according to the Mississippi Department of Transportation specifications.

Elevation View

According to an elevation view, each barrier should measure 32” tall and 10’-0” long (plus or minus ½”). All coil loops should be recessed by ½”. Each barrier should include bars U, M, R, S, and L. Each barrier should also include two lifting slots, which are each 6” long and spaced 3’-1” from the end of the barrier to the beginning of the slot.

Plan View

According to the plan view, each barrier should include two ¾” diameter, 6” long, national coarse thread coil loop inserts. Two are required per section. These inserts should be spaced 3’-4” apart from each other, and 3’-4” away from each end of the barrier.

End View

From an end view, each barrier should measure 24” wide at the bottom of the barrier and 6” wide at the top of the barrier. Barriers should be 32” tall and included beveled edges. Each v-notch should measure 12” long. The break point should occur at 10”, with a 3” vertical reveal.

Mississippi Concrete Median Barrier Delineators

Delineators for concrete precast median barriers (type 1) in Mississippi should include the following features, according to the Mississippi Department of Transportation specifications.

1. Delineators should be required unless indicated otherwise on the plans. This item will not be measured separately, but will be included under payment for precast concrete barrier.

2. Delineators should be encapsulated lens reflective sheeting on aluminum sheet, 0.08” thick, or sheet steel, 14 gage, which is galvanized.

3. Include aluminum or stainless steel slotted round head machine screws, No. 10, 1-1/2” long, 2 washers and 1 hex head nut (commercial quality).

4. The delineators should be installed facing traffic with yellow on the left side and white on the right side, unless otherwise specified.

5. Spacing of delineators should be as follows:

a. Tangent section: 20’-0”

b. Curved section: 10’-0”

6. Optional delineators, which are on the Mississippi Department of Transportation “list of approved materials,” will be accepted.

Mississippi Concrete Median Barrier Anchor Stud Connector Details

Alternate methods of connecting precast barriers, such as J-hooks, may be substituted for anchor studs if approved by the engineer.

Each anchor stud connector should measure 2’-1” long and include a HSS hex nut “F” or 1-1/4 – 7 UNC HSS hex bolt head at the top, paired with one 1/8” nut.

Rods should be threaded steel or 1-1/4” – 7 UNC HSS hex bolt.

At the bottom of each connector, three items are required:

1. 1-1/4” – 7 UNC thread pitch (typ.)

2. Hardened round washer “H”

3. HSS hex nut “F”

Mississippi Concrete Median Barrier Quantities

The Mississippi Department of Transportation outlines approximate quantities for 10’ barriers.

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

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