512Expansion Joints

Expansion Joints

512.1DESCRIPTION

1 This section describes the requirements for the installation of expansion joints.

512.2MATERIALS

1 Provide materials in accordance with the following:

Material Subsection Compressed Joint Material 807.6 Preformed Elastomeric Compression Joint Seal 807.5

2 Provide adhesive for installing compressed joint material and sealant for the splices as recommended by the joint material supplier. Provide lubricant adhesive for installing elastomeric compression joint seals as recommended by the joint seal supplier.

512.3EQUIPMENT—V acant

512.4CONSTRUCTION

512.4.1 General

1 At least 14 calendar days before installation, give the engineer the manufacturer’s written recommendations for joint installation. Do not install joint material before obtaining the engineer’s approval of the prepared surface, depth, width, and alignment.

2 Form the joints in the concrete to provide true, vertical sides with no projections. Remove irregularities in the joint faces that would prevent full contact of the joint material. Do not allow joint width to vary from specified dimensions by more than 12½ percent, measured perpendicular to the joint. Protect joints from damage until completion of all work on the structure.

3 After the concrete has cured and immediately before installing the joint, clean the concrete surfaces of the joint thoroughly, removing all foreign matter including grease, oil, and curing compound.

4 Ensure that the completed installation provides a watertight seal.

Expansion Joints SECTION 512

512.4.2 Compressed Joint Material

1 Provide compressed joint material for the specified depth and gap size. C oat joint contact surfaces with adhesive, in accordance with the manufacturer’s recommendations. Install material at an air temperature from 45 °F [7 ° C] to 85 °F [30 ° C]. Uniformly recess the top of the material ¼ in [6 mm] below the top of the concrete. Ensure that splices are vertical and beveled 45 degrees horizontally. Place sealant in the splice before butting the pieces.

512.4.3 Elastomeric Compression Joint Seal

1 Install elastomeric compression joint seal in a compressed state, without stretching. Seal each joint with one continuous length of seal.

512.4.4 Expansion Joint (Gland)

1 Submit shop drawings of the expansion joint system, including shop and field welds, to the State Bridge Engineer for approval as described in Subsection 501.4.1.3, Shop Drawings.

2 Deliver each steel rail to the job site in two pieces, to be spliced by field welding. In preparing the splice joint for welding, cut the ends of the rail to ensure the slope of the rail matches the bridge roadway. Field weld rails as shown in the contract and in accordance with the manufacturer ’s recommendations. Ensure all other welds for splicing rails, including those at the curb or sidewalk miter, are shop welds . Paint all cut, field welded or damaged surfaces with two coats of zinc-rich paint conforming to ASTM A 780.

3 Install the steel rails as shown in the contract and in accordance with the manufacturers recommendations. Ensure the gland is continuous, sealing the deck surface and front faces of the curb or sidewalk as indicated in the contract and installed in accordance with the manufacturer’s recommendations.

4 Install the snow plow plates and sidewalk cover plates as specified in the contract.

512.5MEASUREMENT and PAYMENT

1 The engineer will measure:

along the centerline of the joint, including curb and gutter sections.

Expansion Joints SECTION 512

2 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Compressed Joint Material FT [m] 0.1 ft [0.05 m] FT [0.5 m] Elastomeric Comp Joint Seal FT [m] 0.1 ft [0.05 m] FT [0.5 m] Expansion Joint (Gland) FT [m] 0.1 ft [0.05 m] FT [0.5 m]