505Concrete Barrier

Concrete Barrier

505.1DESCRIPTION

1 This section describes the requirements for constructing concrete bridge barrier, bridge median barrier, median barrier, and shoulder barrier.

505.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection Admixtures 801.4 Aggregate 803 Curing Materials 802.1 Fly Ash 801.2 Grout 819.1 Portland Cement 801.1 Reinforcing Steel 811.1 Water 814.1

2 Provide and install delineation as specified.

505.3EQUIPMENT

1 Ensure that equipment meets the following requirements:

Equipment Subsection Batch Plant 513.3.1 Mixers 513.3.2 Placing and Finishing Equipment 513.3.3

2 Use steel forms.

505.4CONSTRUCTION

505.4.1 General

1 Use class A concrete in accordance with Subsection 513.4.4, Mix Design.

Concrete Barrier SECTION 505

2 Cast-in-place or slipform concrete barriers. Do not slipform bridge barrier if there is traffic on the bridge. Secure cast-in-place barrier forms for roadway barrier without damaging roadway pavement.

505.4.2 Installation

1 Vibrate and work the concrete until consolidated and free of voids without segregating the mix. For the slipform method, use concrete capable of maintaining the shape of the barrier without support. Cure in accordance with Subsection 513.4.13, Curing Concrete. Surfaces protected by forms for five calendar days or more do not require curing.

2 Immediately after removing forms, give the exposed surfaces of bridge barrier a rubbed finish in accordance with Subsection 513.4.12, Finishing Concrete Surfaces. For shoulder and median barriers, leave an ordinary finish.

3 Saw and grout shoulder and median barrier joints as specified, including casting anchor bolts in terminal ends and furnishing steel sleeves or other hardware for guardrail connections.

4 Place concrete barrier delineators, of the type specified, at 20- foot [6 m] intervals throughout the length of the barrier.

505.4.3 Dimensional Tolerances

1 Remove and replace barrier not meeting tolerance requirements at no additional cost to the department. Ensure that concrete barrier meets the following tolerances:

and

face variation under a 10-foot [3 m] straightedge no greater than 1/4 in [6 mm].

505.5MEASUREMENT and PAYMENT

1 The engineer will measure Bridge Barrier, Bridge Median Barrier, Median Barrier __ in [mm], and Shoulder Barrier by the foot [meter] and without deducting for open joints required over bridge expansion joints.

Concrete Barrier SECTION 505

2 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Bridge Barrier FT [m] 0.1 ft [0.05 m] FT [0.5 m] Bridge Median Barrier FT [m] 0.1 ft [0.05 m] FT [0.5 m] Median Barrier in ____ in [mm] FT [m] 0.1 ft [0.05 m] FT [0.5 m] Shoulder Barrier FT [m] 0.1 ft [0.05 m] FT [0.5 m]