What are the Washington Type F Concrete Barrier Specifications?

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

Washington Type F Concrete Barrier General Notes

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

1. Concrete for barrier Type F should be Class 5000.

2. The reinforcing steel details for the narrow base barrier are the same as those shown for the 24” wide barrier, except for the stirrup bars. Bar 6 runs along the vertical face of the narrow base barrier with a 1-1/2” clearance.

3. Precast concrete barrier Type F can be installed in the following configurations:

a. Unanchored on hot mix asphalt or cement concrete pavement in permanent or temporary installations, and on compacted soil in temporary installations. It’s permissible to manufacture the Type F barrier without pin slots and pin slot bars when the barrier is not anchored.

b. Anchored on hot mix asphalt or cement concrete pavement in permanent or temporary installations as shown on the plans. See Standard Plan K-80.35 and K-80.37 for anchoring Type F narrow base in temporary installations on cement concrete pavement or bridge decks.

c. See Standard Plan C-60.70 for anchoring patterns when transitioning from Type F anchored runs to another type of barrier run.

d. After removing the anchoring pins, clean the pin holes and fill them with sealant according to Standard Specification Section 9-04.2.

e. Remove slack between barrier segments after inserting the connecting pin.

Washington Type F Concrete Barrier Specifications

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

Plan View
The unit section length is 12’-6” long and 24” tall. Barriers include a 1-7/8” x 4” pin slot (typ.) when required. Barriers also include #4 bars (typ.).

Elevation View

Barriers include ¾” diameter loop bars. On the left side of the barrier, the bottom loop bar is spaced 6” from the ground line; the center loop bar is spaced 4” from the bottom loop bar; the upper loop bar is spaced 14” from the center loop bar. On the right side of the barrier, these measurements are reversed.

Barriers measure 32” tall.

Barriers include two lifting slots, which measure 12” wide. The outer edge of each lifting slot is spaced 31-1/2” from the closest outer edge of the barrier.

Barriers include #4 bars (pairs) ~ 5 spaces at 18”.

Barriers include a 1-7/8” x 4” pin slot (typ.) when required.

Barrier Pin Loop Details

Pin loop bars measure ¾” in diameter and protrude 2” from the edge of the barrier.

End A & B

From an end view, barriers measure 24” wide at the bottom and 9-1/2” wide at the top. They include a ¾” chamfer (typ.) and a 10” R. (typ.). The break point is 10” from the ground line. There is a 3” vertical reveal. The lower slope measures 7” tall.

Barriers measure 32” tall and are symmetrical in nature.

Reinforcing Steel

Note that for reinforcing steel, stirrup bars may be fabricated as a single piece, and the narrow base may be fabricated as a single piece. Steel should be hot dip galvanized after fabrication per ASTM A767.

Stirrup bars measure 27” tall (per bar), 13-1/2” wide on the bottom (long) end, and 6” wide on the top (short) end. When two stirrup bars are formed together, the total width is 14-7/8” at the bottom and 10-3/4” at the top (per pair of bars).

Pin slot bars measure 22” long and 6-3/8” wide.

There are 20 stirrup bars per barrier and 6 pin slot bars per barrier (when required).

Loop Bars

Loop bars measure ¾” in diameter per ASTM A36 hot roll. Bars should be hot dip galvanized after fabrication per AASHTO M 111.

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

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