622Concrete Barrier

622.01 Description. This work consists of furnishing and placing portland cement concrete

barrier on the accepted and prepared subgrade, subbase course, or existing pavement. This item also consists of furnishing, placing, maintaining, and removing portable barrier.

622.02 Materials. Furnish materials conforming to:

Concrete, Class QC 1 [1][2] ................................. 499 Reinforcing steel and wire fabric .................................... 509.02 Forms .............................................. 515.14 Preformed filler ............................... 705.03 Curing materials ................. 705.05, 705.06, ...................................... or 705.07 Type 2 Precast concrete .............................. 706.13 Dowel bars .................... 709.01 thru 709.05 Steel.................................................. 711.01 [1] Replacing Coarse aggregate in the concrete mixes with Recycled Concrete Aggregate conforming to Supplement 1117 is an option. [2] Provide a Concrete Cylinder Cure Box per 511.04. For Type N Concrete Barrier, the ambient air temperature shall not exceed 85℉ when placing the concrete.

622.03 Placing Concrete . Construct concrete barrier by cast -in-place, precast, or slip -form

methods. For slip-form construction, conform to 609.04.C.Slip forming is not permitted in sections of concrete barrier wall containing ITS junction boxes, a minimum 4-foot section shall be cast-in-place.

622.04 Portable Barrier. Furnish individual sections not less than 10 feet long. If intending to

use the barrier at one location on the project, the Contractor may slip-form barriers in place without joints, or with grooved or sawed joints to facilitate removal. As directed by the Engineer , repair or replace barrier sections damaged during handling or by traffic, for the life of the project. The Contractor may substitute ODOT’s generic portable concrete barrier with an approved alternate portable barrier system in accordance with the Roadway Approved Products List, which can be found on the Office of Roadway Engineering’s website. Ensure subst itutions are utilized within the plan design limitations while still complying with all applicable crashworthy requirements, manufacturer specifications, and other ODOT standards. Obtain the Engineer’s written approval (for bridge deck punctures) before substituting an approved alternate portable barrier system that requires anchoring for an unanchored portable barrier on a bridge deck. All barrier segments are to be marked on the top, PCB -XX-MASH- TL-3, where XX indicates the year cast. If the barrier is ca st using welded wire fabric instead of the rebar, add “WWF” to the end of the notation. Permanently impress these markings in the barrier using a minimum of 2” high lettering. If any portable barrier is inappropriately substituted within the context of the plan design, not installed in an applicable crashworthy compliant configuration, not installed per the manufacturer’s specifications, and/or a substitution has been made that impacts the ability to comply with other ODOT standards, then the portable barrier system shall be removed and replaced within 3 days at no expense to the Department. Prior to placing anchored portable barrier sections on a concrete bridge deck, the contractor shall locate and mark the approximate location of the top mat of reinforcing near the limits of the proposed alignment of portable barrier. The Engineer may direct the contractor to shift the location of the alignment to avoid anchors puncturing the top reinforcing mat if determined feasible. Greasing or lubricating anchors prior to installation of anchored portable barrier sections is not allowed. When anchors are removed from a bridge deck or pavement, fill the holes with a material conforming to 705.20.

622.05 Joints. Construct joints for cast-in-place or slip-formed barrier of the type and dimensions

and at the locations specified.

622.06 Finish. Immediately following removal of fixed forms or slip -form construction, check

the surface of the barrier with a straightedge and correct all irregularities of more than 1/4 inch in 10 feet. Finish and make corrections to the barrier surface according to 511.18.

622.07 Curing. Cure concrete according to 511.13, Method B and the following additional

requirements. Apply the curing compound using an approved mechanical sprayer equipped with a shield to protect the spray from wind. For small areas, the Engineer will allow the use of other acceptable methods. Apply two layers of Method B Membrane Cure according to 511.13.B. The second coat should be applied no sooner than 1 hour after applying the first coat. Do not apply any load or conduct any work that will damage newly placed concrete. Allow a minimum of 36 hours of cure time to elapse on any concrete placed first at a horizontal construction joint. The Contractor may cure precast sections according to 515.15. With the Engineer’s approval, the Contractor may also use radiant heated forms for curing. The Contractor may use 511.13, Method A for curing of short sections of barrier (leave -outs); however, before the curing is completed for any leave-outs, apply material conforming to 705.07, Type 2 at the normal rate specified in 511.13, Method B. The Contractor may cure horizontal construction joints between the foundation and the upper portion of the barrier, and between portions of the upper barrier placed separately according to 511.13, Method A or B. Do not remove the membrane before placing the next portion of the concrete barrier.

622.10 Method of Measurement. The Department will measure Concrete Barrier by the number

of feet along the centerline of the top of the barrier, including all transitions, and bridge pier sections as specified, complete in place . Measurement excludes end anchorages, end sections, inlets, junction box segments for lighting or ITS, and foundation segments for light towers, sign supports, and DMS supports. The Department will measure Reinforced End Anchorages of the type specified by the number each complete in place. The Department will measure End Sections of the type specified by the number each complete in place. The Department will measure Portable Barrier Anchored, Portable Barrier Unanchored, Portable Barrier 50” and Portable Barrier 50” Bridge Mounted by the number of feet for each application of the barrier placed according to the plans. The Department will measure each re-use of barrier sections at a different location required by the plans separately. The Department will not measure repaired or replacement barrier sections damaged during handling.

622.11 Basis of Payment. The cost of all inserts, sleeves, fittings, connectors, reinforcement, dowels,

preformed filler, excavation, aggregate base, and backfill is incidental to these items. Anchoring required for approved alternate portable barrier systems when substituted for Portable Barrier, Unanchored, is incidental to the pay item. Transitions from Unanchored Portable Barrier to Anchored Portable Barrier, along with Portable Barrier (Anchored or Unanchored) to permanent barrier, including all items necessary for the transitions are incidental to the pay item. The Department will pay for accepted quantities at the contract prices as follows: Item Unit Description 622 Foot Concrete Barrier, Type ___ 622 Each Concrete Barrier End Anchorage, Reinforced, Type ___ 622 Each Concrete Barrier End Section, Type ____ 622 Foot Portable Barrier, Unanchored 622 Foot Portable Barrier, Anchored 622 Foot Portable Barrier, 50” 622 Foot Portable Barrier, 50” Bridge Mounted ITEM 623 CONSTRUCTION LAYOUT STAKES AND SURVEY MONUMENTS

Concrete Barrier in other states

• Alaska 614 · CONCRETE BARRIER
• Delaware 723 · CONCRETE BARRIER
• Georgia 621 · Concrete Barrier
• Iowa 2513 · Concrete Barrier
• Illinois 637 · CONCRETE BARRIER
• Indiana 602 · CONCRETE BARRIER
• Massachusetts 629 · CONCRETE BARRIER
• Maine 526 · Concrete Barrier