514Concrete Barrier Railings for Bridges

514.1 Description

This Work consists o f constructing concrete barrier railings f or Bridges.

514.2 Materials

The Contractor shall provide Material in accordance with the f ollowing requirements: 1. Class HPD concrete will be used for barrier railings concret e on Bridges in accordance with Section 509, “Portland Cement Concrete Mix Desi gns” and 510 “Portland Cement Concrete.” 2. Reinforcing steel in accor dance with Section 540, “Steel Rei nforcement.”

514.3 Construction Requirements

514.3.1 General

The Contractor shall perform Work in accordance with Section 5 11, “Concrete Structures.” The Department will not allow welding to anchor bars and other barrier reinforcement.

514.3.2 Deck Preparation for Barrier Placement

The Contractor shall cure Bridge deck tops beneath barrier rai lings using the water curing method per Section 511.3.9 “Curing”. Before placing the railin gs, the Contractor shall thoroughly clean dirt, oil, and other Deleterious Materials fro m the deck surface.

514.3.3 Barrier Placement and Placement Tolerances

The Contractor shall cast concrete barrier railings in place u sing removable forms. Slip forming of concrete barrier r ailings for Bridges will not be al lowed. For Bridges set on tangents, the Contractor shall set the form s and place the concrete so that a stringline placed along th e top inside edge of the finis hed barrier shows no horizontal deviations from a straight line gr eater than 3/8 inch within 20 ft. For Bridges set on curves, the Contractor shall ensure that th e horizontal deviations from the horizontal curve do not exceed 3/4 inch within 20 ft. The Contractor shall ensure that the overall vertical toleranc e of the outside surface of the barrier railings is less than 3/8 inch within the full heig ht. The Contractor shall place concrete for barrier railings in ac cordance with Section

511.3.5 “Concrete Placement.” However, the Contractor shall no t allow the depth of layers for

placing concrete in the barri er forms to exceed 18 inches.

514.3.4 Finishing

The Contractor shall perform finishing in accordance with Sect ion 511.3.9, “Finishing.”

514.3.5 Curing

The Contractor shall perform curing in accordance with Section 511.3.10, “Curing.”

514.3.6 Final Treatment of Barrier Railing

After finishing and curing, the Contractor shall apply a penet rating water repellent treatment to the exposed surfaces of the barrier railings in ac cordance with Section 532, “Penetrating Water Repellent Treatment.”

514.3.7 Drilling Holes

The Contractor shall provide holes for attaching thrie-beam or W-beam terminal connector plates to barrier raili ngs. The Contractor shall plac e the holes for attachments at least six (6) inches away from j oints or ends of barrier railin g. If the Contractor elects to core drill the holes, care shall be taken to place reinforcement such that it will not be compromised by the core drilling process. The Contractor shall not spall the concrete during the core drilling process. Damaged reinforcing and spalled concrete will be repaired under Section 533 “Concrete Structure Repair” at no co st to the Department. If the Contractor elects to sleeve the holes, care shall be tak en to place the sleeved holes per Contract. Should the holes deviate from Contract, the Contract or shall replace the connector plates at no additional cost or schedule impact to the Departme nt.

514.4 Method of Measurement

The Department will measure concrete barrier railings along the top of the barrier from end to end, including c oncrete transitions.

514.5 Basis of Payment

Pay Item Pay Unit Concrete Barrier Railings Linear Foot

514.5.1 Work Included In Payment

The following items will be considered as included in the payme nt for the main item(s) and will not be measured or paid for separately: 1. Reinforcing steel; 2. Holes for terminal connector plates; 3. Dowels and all embedded steel items; and 4. Penetrating water repellent treatment. Section 515 Reinforced Concrete For Minor Structures Page 386