602CONCRETE BARRIER

602.01Description

This work shall consist of the construction of concrete barriers and concrete glare screens in accordance with these specifications, and as shown on the plans.

MATERIALS

602.02Materials

Materials shall be in acco rdance with the following: 10

602.01

Barrier Delineators ...................................................... 926.02(c) Construction Warning Lights ...................................... 923.03 Reinforcing Bars .......................................................... 910.01

CONSTRUCTION REQUIREMENTS

602.03Concrete Barrier an d Concrete Glare Screen

Concrete barrier and concrete glare screen may be precast or cast-in-place. The option selected shall be used continuously throughout the project. Irregular sections shall be cast-in-place regardless of the option selected.

Concrete glare screen may only be precas t when constructed in combination with new precast barrier. Concrete glare screen shall be cast-in-place when constructed in combination with cast-in-place barrier and when constructed on top of existing 30 concrete barrier.

Excavation and compaction shall be in accordance with 605.03(a). Backfilling shall be in accordance with applicable requirements of 605.03(d).

Precast concrete barrier and concrete glare screen shall be constructed in accordance with applicable requirements of 707, except the minimum 28-day compressive strength shall be 3,000 psi. The precast units shall not be shipped or used until this strength is attained. The surfaces of individual precast units shall vary no 40 more than 1/4 in. in 10 ft from the speci fied cross-section, as measured from a longitudinal straightedge. The maximum variation in the vertical and horizontal alignment of adjacent units shall be 1/4 in. ac ross the joint, as measured from a 10 ft longitudinal straightedge. Approved bedding may be used to obtain proper alignment of the concrete barrier sections.

Cast-in-place concrete barrier and concrete glare screen shall be constructed in accordance with applicable requirements of 706.03 or by the use of an approved slip-form machine. The surfaces of the concre te shall vary no more than 1/4 in. in 10 50 ft from the specified cross-section, as measured from a longitudinal straightedge. Where concrete pavement or concrete shou lder abuts the concrete barrier, 1/2 in. preformed joint filler shall be placed as shown on the plans.

Where the concrete barrier is to be placed on PCCP, epoxy coated reinforcing bars shall be placed as shown on the plans. The epoxy coated reinforcing bars shall be installed in the PCCP by drilling and grouting. 602.03

The barrier wall shall be constructed in single pours without subsequent vertical extensions. 60

When shown on the plans, cast-in-place mo dified concrete barrier sections shall be in accordance with the abov e requirements and the concrete shall be class A in accordance with 702.02.

Concrete barrier and concrete glare screen shall be finished in accordance with

702.21. If slip-form construction is used, an approved brush finish will be allowed

Curing material in accordance with 912.01(e) shall be applied as a bond breaker to all areas which result in concrete-to-concrete contact. It shall be applied at a minimum 70 rate of 1 gal./75 sq ft. If material is applied at a rate less than the minimum rate, a second application shall be applied.

Regardless of the method of construction, all exposed surfaces of the concrete barrier and concrete glare screen shall be sealed in accordance with the applicable requirements of 709.

The type, size and location of joints and preformed joint filler shall be as shown 80 on the plans.

All concrete barrier shall be reflect orized with barrier delineators spaced a minimum of 40 ft apart and centered 2 ft above the surface of adjacent pavement or shoulder. The reflectorization shall be on both sides of the wall if traffic is on both sides. All delineators damaged during installation or placement of the concrete barrier shall be replaced with no additional payment. The color of the reflectors shall match the color of the adjacent pavement traffic markings.

602.04Blank

602.05Method of Measurement

Concrete barrier will be measured by the linear foot along the centerline of the barrier, including irregular barrier sections around median obstructions such as bridge piers. Barrier delineators will be measured per each provided there is a pay item shown in the Schedule of Pay Items. Concrete glare screen will be measured by the linear foot along the centerline of the glare screen. Cl ass A concrete for cast-in-place modified concrete barriers will be measured by the cubic yard for the modified barrier section. No deductions will be made for reinforcing bars or joints. Reinforcing bars for cast-100 in-place modified concrete barriers will be measured in accordance with 703.07.

602.06Basis of Payment

Concrete barrier will be paid for at the contract unit price per linear foot, complete 602.04

in place. Class A concrete for cast-in-place modified concrete barriers will be paid for at the contract unit price per cubic yard. Re inforcing bars for cast-in-place modified concrete barriers will be paid for in acco rdance with 703.08. Barrier delineators used on concrete barrier will be paid for at the contract unit price per each, complete in place.

Concrete glare screen will be paid for at the contract unit price per linear foot, complete in place.

Payment will be made under:

Pay Item Pay Unit Symbol

Barrier Delineator ...................................................................... EACH Concrete Barrier Glare Screen ................................................... LFT Concrete Barrier ........................................................................ LFT 120 Concrete Barrier, Modified Section ........................................... CYS

The cost of polyethylene film, surface seal, and curing material shall be included in the cost of concrete barrier.