1090BRIDGE PRESERVATION AND REHABILITATION

1090.1DESCRIPTION—This work is bridge preservation and rehabilitation as follows:

seals for unarmored and armored joints.

expansion dams for bridge joints of the indicated movement classification, including the necessary fabricated structural steel. This work also includes the removal of existing expansion dams, cover plates, railing, barrier, sidewalk, and portions of bridge deck for the installation of new neoprene strip seal expansion dams.

and replacement with a new neoprene strip seal gland of the indicated movement.

prestressed concrete beams.

approach slab cracks with High Molecular Weight Methacrylate (HMWM) sealer.

1090.2MATERIAL—

• Class AAAP Cement Concrete. Section 704, except use No. 8 coarse aggregate.

• Class AA Cement Concrete. Section 704, except use No. 8 coarse aggregate.

• Accelerated Structural Concrete (ASC). Section 704, except use No. 8 coarse aggregate.

• Reinforcement Bars. Section 709.1

• Epoxy Bonding Compound. Type II, Grade 2, ASTM C881 epoxy as specified in Section 706

• Forms. Section 1001.2(h)

• Mechanical Splice System. Section 1002.2(c)

• Galvanized Spray. ASTM A780

• Concrete Bonding Compound. Section 706, ASTM C881, Type II, Grade 2 from a manufacturer listed in Bulletin 15 compatible with patching material.

• Steel Expansion Anchor Pins. Section 1105.02(c), 3/8-inch diameter, galvanized according to ASTM B633

• Welded Wire Fabric (WWF). Section 709.3(b), 4x4-W2.1xW2.1 min.

• Polymer Modified Rapid Hardening Concrete Patching Material. From a manufacturer listed in Bulletin 15

• Penetrating Sealer. Section 1019

• HMWM Crack Filler/Sealer. Provide a low odor, HMWM crack filler/sealer, consisting of a resin, initiator, and promoter. Provide HMWM conforming to Table A. Store components according to the manufacturer’s recommendations. Provide initiator for the methacrylate resin consisting of a metal drier and peroxide. Provide resin and initiator pre- mixed from the manufacturer. Do not store containers and measuring devices in a manner that allows leakage or spilling.

• Broadcast Sand. Provide commercial quality blast sand having no less than 85 %passing the No. 8 sieve and no less than 90% retained on the No. 200 sieve, AASHTO T 27. Broadcast sand is to be kiln dried and protected from moisture until time of placement.

TABLE A HMWM Requirements Property Requirement Test Method Apparent Viscosity*, cps, max 25 ASTM D2196, Test Method A (Brookfield RVT with UL adapter, 50 RPM) Volatile Content*, %, max 30 ASTM D2369 Specific Gravity* at 77F, min 0.9 ASTM D1963-85 (1996) Flash Point, F, min 180 ASTM D3278 Vapor Pressure* at 77F, mm Hg, max 1 ASTM D323 Gel Time, minutes, 100g mass 40 ASTM D2471 thin film Percent Solids, by weight 90 - Bond Strength, psi, min 1,500 ASTM C882 * Perform test before initiator is added

1090.3CONSTRUCTION—As shown on the Standard Drawings and as follows:

barrier cover plates, seal material, foam, and joint filler. Retain cover plates and re- install after joint has been re-sealed. During removal operations, do not damage portions of the structure to remain. Repair areas damaged beyond the removal limits at no additional cost to the Department.

groove as specified in Section 1008.3(c). If spalling cannot be removed by sawcutting a new seal groove, perform repairs as directed and as specified in Section 1040. Install seal as specified in Section 1008.3(d).

SSPC-SP6 in direct contact with the seal. Install seal as specified in Section 1021.3.

1.a Removal. Install falsework and shielding before removal. Remove barrier railings and posts as required to perform the indicated repairs. Do not damage or cut. Set aside for reuse. Remove existing barrier and sidewalk cover plates, dam and portions of existing deck, barrier, and median to the limits indicated or delineated by the Representative. Provide a 1-inch sawcut at all removal limits to create a neat removal line. Use pneumatic hammers not exceeding an impact rating of 30 foot-pounds or hand tools to remove concrete.

Do not use excavators or large equipment with hammer attachments to remove concrete. During removal operations, do not damage portions of the structure to remain. Do not cut existing reinforcement that is to remain. Repair areas damaged beyond the removal limits at no additional cost to the Department .

1.b Preparation. Abrasive blast or wire brush exposed existing reinforcement that is to remain to near white metal and to remove loose concrete chips. Coat existing reinforcement to remain with an approved epoxy paint before placing new concrete.

1.c Repair. Install formwork and place reinforcement as indicated and specified in Section 1002.3. Apply epoxy bonding compound according to the manufacturer's specifications. Place Class AAAP Cement Concrete at blockout in bridge deck as indicated and against contact surface while epoxy bonding compound is still tacky to ensure bond between contact surface and fresh concrete. Place Class AA Cement Concrete in barrier as indicated. Cure concrete as specified in Section 1001.3(p)3.b. 2. Clean extrusion and install neoprene seal as specified in Section 1026.3. Reset barrier rail once barrier concrete has hardened sufficiently to support the rail.

2.a Removal. Follow Standard Method for removal for prestressed concrete beam bridges. Install falsework and shielding before removal. Remove barrier railings and posts as required to perform the indicated repairs. Do not damage or cut. Set aside for reuse. Remove existing barrier and sidewalk cover plates, dam, and portions of existing deck, barrier, and median to the limits indicated or delineated by the Representative. Provide two sawcuts. Provide first sawcut 6 inches from the removal limit (dam side) to a depth of 1 inch from existing beams. Remove concrete using an excavator with hammer attachment not exceeding an impact rating of 500- foot pounds. Provide second sawcut , 1-inch maximum depth at the removal limit and remove the remaining concrete with pneumatic hammers not exceeding an impact rating of 30 foot - pounds to expose 6 inches of the existing longitudinal reinforcement to accommodate a mechanical coupler. During removal operations, do not damage portions of the structure to remain. Repair areas damaged beyond the removal limits at no additional cost to the Department.

2.b Preparation. Section 1090.3(b)1.b.

2.c Repair. Install formwork and place reinforcement as indicated and specified in Section 1002.3. Using mechanical couplers, install longitudinal reinforcement. Install transverse reinforcement and all barrier reinforcement damaged during the removal operations. Apply epoxy bonding compound according to the manufacturer's specifications. Place ASC at blockout in bridge deck as indicated and against contact surface while epoxy bonding compound is still tacky to ensure bond between contact surf ace and fresh concrete. Place ASC in barrier as soon as bridge deck concrete in blockout can support the barrier concrete and as indicated. Cure as specified in Section 1001.3(p)3.d. Clean extrusion and install neoprene seal as specified in Section 1026.3. Reset barrier rail once barrier concrete has hardened sufficiently to support the rail.

field measurements to seal manufacturer and provide replacement seals for the movement classification indicated and according to the manufacturer’s recommendations. Remove existing barrier and sidewalk cover plates. Remove existing strip seal gland. Abrasive blast or wire brush areas of rust on the extrusion to clean white metal. Use galvanizing spray to coat blasted or brushed areas. Clean extrusion and install seal as specified in Section 1026.3. Reinstall barrier and sidewalk cover plates.

1.a Hand Tools. Use hand tools for removal including hammers and chisels.

1.b Pneumatic Hammers. Use pneumatic hammers for removal not exceeding 15 foot-pounds.

• Do not operate pneumatic hammers at an angle in excess of 45 degrees relative to the surface of the beam.

• Do not place pneumatic tools in direct contact with reinforcement bars or strands.

is to be on site to ensure proper mixing and application procedures. Before crack sealing, protect all joint seals and scuppers from infiltration of HMWM Sealer. Prepare surface and cracks according to the manufacturer’s recommendations. Before filling and sealing operations, protect surface and cracks from materials that can interfere with the filling and sealing of cracks and curing of the HMWM sealer. The surface and cracks are to be dry and free of dust, dirt, and debris. Apply HMWM sealer according to the manufacturer’s recommendations. Provide a minimum coverage rate of 100 square foot per gallon. Apply HMWM sealer when substrate temperatures are between 50F and 100F and during the lowest ambient temperature period of the day, when cracks are open to the greatest extent. Apply HMWM sealer directly to the areas of the deck that are cracked allowing time for the HMWM sealer to seep into the cracks, making additional applications until cracks are filled and level with the surface. Work the HMWM sealer into cracks with a broom or squeegee. Brush excess HMWM sealer off the surface before hardening. Do not apply HMWM sealer that exhibits an increase in viscosity on the concrete surface. Broadcast sand over the applied HMWM sealer at a minimum rate of 1 pound per square yard. Broadcast sand as soon as practical and before the viscosity begins to increase. Remove excess loose sand before opening to traffic. Do not open to traffic until HMWM sealer is cured.

1090.4MEASUREMENT AND PAYMENT—

For unarmored joints, t he unit price includes sawcutting a new seal groove. Repairs as specified in Section 1040 will be paid separately.

For the method and movement indicated. Measured out -to-out along the centerline of the exposed surfaces of the seal and the steel plates, including sidewalks if applicable, following the vertical and sloped faces of curbs and barriers, resulting in a true length, not a horizontally projected length.

Length measured along centerline of seal including bends and upturns.

Penetrating sealer is incidental to this item.