What are the Washington Precast Single Slope Concrete Barrier Specifications?
The Washington Department of Transportation outlines specifications regarding the proper dimensions for concrete barriers, including general notes, plan view details, elevation details, section view details and more.
Washington Precast Single Slope Concrete Barrier General Notes
The Washington Department of Transportation’s general instructions are as follows:
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Installation requirements: Embed barrier 3” minimum in asphalt or concrete. Embed barrier 10” minimum in compacted soil. Install 3/8” premolded joint filler between segments. Fill the connection blockout with grout, centering the rebar grid in the blockout before adding the grout.
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Use cast in place single slope barrier (Standard Plan C-80.10) for installation on a horizontal curve with a radius less than 2,000 feet.
Washington Precast Single Slope Concrete Barrier Specifications
Washington barriers should conform to the following specifications according to the Washington Department of Transportation:
Plan View
Barriers measure 20’-0” long. The inner barrier slot measures 3” wide.
Elevation View
Steel welded wire reinforcement deformed for concrete can be substituted for reinforcing steel in accordance with Standard Specification, Section 6-10.3.
Rebar grid is installed permanently and is bended to fit.
Barriers include a 3/8” premolded joint filler for permanent installation.
Each barrier includes two lifting slots, which measure 2’-0” wide (typ.). The left edge of the left lifting slot is spaced 5’-4” from the left edge of the barrier. The right edge of the right lifting slot is spaced 5’-4” from the right edge of the barrier.
The height of a barrier will change the number of horizontal bars required, as detailed in the table below.
Rebar Grid Detail
Rebar grids include #8 bar (typ.), #6 bar (typ.) and tack weld (typ.). The #8 bar is spaced 8” from the tack weld, and the #6 bars are spaced 10” apart from each other. Together, these bars form a square grid.
Washington Precast Single Slope Concrete Barrier Section Details
Washington barrier sections should conform to the following specifications according to the Washington Department of Transportation’s section details.
Section A
Barriers measure 2’-0” wide at the bottom, 8” wide at the top, and 3’-6” tall. They include a ¾” chamfer (typ.) and an embedment of 3” (minimum) when measured from the top of the roadway. Barriers include a symmetrical v-notch at the bottom center of the barrier. Barriers should protrude from the top of the roadway by a minimum of 2’-10”.
Inside the barrier, the minimum distance between any bar and the outside of the barrier is 1-1/2” (typ.).
Section B
Section B outlines a few changes when compared to Section A. Section B barriers are 3’-6” barriers for use with a 0” to 4” (max.) grade separation. The embedment of these barriers is 3” minimum to 4” maximum from the top of the roadway.
For 4’-0” barriers for use with a greater than 4” to 7” (max.) grade separation, the embedment is 4” minimum to 7” maximum.
For 4’-6” barriers for use with a greater than 7” to 10” (max.) grade separation, the embedment requirements are 7” minimum to 10” maximum.
This blog post is an interpretation of specifications by the Washingotn Department of Transportation. Please consult with Washington DOT's most recent requirements for definitive information.
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