1020TOOTH EXPANSION DAM WITH DRAIN TROUGH

1020.1DESCRIPTION —This work is construction of a tooth expansion dam with fabric reinforced drain

troughs for bridge joints.

1020.2MATERIAL—

1105.02(s)

requirements:

• Number of plies 2

• Minimum fabric weight, oz./sq. yd. 7.5

• Minimum tensile strength lb./in., ASTM D378 425

Acrylonitrile Elastomer conforming to the following requirements:

• Hardness shore ‘A’, ASTM D2240, minimum – maximum 60-70 durometer

• Minimum tensile strength, psi, ASTM D412 1400

• Minimum elongation at break, %, ASTM D412 300

• Oven aging, 70 hours at 212F, ASTM D573 —

ͦ Maximum elongation loss, % -25 ͦ Maximum tensile strength loss, % -35 ͦ Maximum hardness points change +10

• Brittleness to heat aging, ASTM D2137 0F

• Tear resistance, lb./in., Die C, ASTM D624 120

• Resistance to ozone aging, ASTM D1149 (Method B, bent loop) No cracks, 70 hours @ 104F and 50 ppm ozone

• Oil swell, ASTM D471, 70 hours @ 212F using IRM 903 oil, mass change % maximum

nylon fabric and rubberized trough material, vulcanized to form a laminate, with the following properties:

• Minimum thickness, in. 1/8

• Minimum composite tensile strength of the fabric reinforced bridge trough, lb./in., ASTM D378

• Maximum elongation @ ultimate tensile strength, % ASTM D412

• Maximum resistance to water absorption, (less than 10% weight gain for 7 days of water immersion @ 150F, ASTM D471 – Procedure for Change in Mass with Liquid on One Surface Only

1020.3CONSTRUCTION—As shown on the Standard Drawings and as follows:

Prepare shop drawings as specified in Section 105.02(d). Obtain acceptance of the shop drawings before beginning fabrication. Use a prequalified fabrication shop as specified in Section 1105.01(a). Weld as specified in Section 1105.03(m). Fabricate and erect the expansion dam according to the shop drawings and as appropriate for the bridge deck grade and crown. Preset the dam opening before shipment and assemble with temporary shipping angles. Install the dam as indicated. After erection, remove the temporary shipping angles and grind plates smooth. Place concrete under the expansion dams, vibrate until the concrete is forced through air holes, and strike off excess concrete. After the concrete has cured, clean air holes and fill with an approved sealer. Do not splice the drain trough, unless indicated. If splices are indicated, use only if splices are vulcanized and spliced by the manufacturer in the shop/factory and are watertight. Do not use longitudinal splices. Repair galvanizing damaged during construction operations as directed and according to the manufacturer’s recommendations, at no additional cost to the Department. Install the trough with stainless steel fasteners. After installation, flood trough with water and inspect for leaks and/or damage. Repair any leaks or damage as directed and according to the manufacturer’s recommendations.

1020.4MEASUREMENT AND PAYMENT—Pound

1021 – 1