621METAL MEDIAN BARRIER

621.1DESCRIPTION—This work is construction of new metal median barrier of the type indicated, resetting

of existing metal median barrier, and removal of existing metal median barrier.

621.2MATERIAL—

• Class A Cement Concrete. Section 704

• Joint Sealing Material. Section 705.4(b) or (c)

• Asphalt Wearing Course. Section 413.2 (Not RPS)

• Reinforcement Bars. Section 709.1

• Asphalt Cement. Class PG 64S-22 or PG 58S-28

621.3CONSTRUCTION—As shown on the Standard Drawings and as follows:

Drive posts, as specified in Section 620.3(a)2, or set manually. As directed, either form holes before placing concrete, or cut or drill holes in existing or newly placed concrete to accommodate the installation. Do not make holes any larger than necessary to install the post. Drive the post to grade after the hole is cut or drilled; backfill the hole with either hot or cold asphalt wearing course material and fill the void around the post with Asphalt Cement, Class PG 64S-22 or PG 58S-28. In areas where random boulders are encountered and the post cannot be driven to grade, remove the post, then drill or excavate a hole of suitable dimensions and depth to place the post at grade. Reset the post and backfill to the ground line, using an acceptable material, thoroughly compacted in 4-inch layers. If a hole has been cut or drilled in paved areas, backfill the hole for the full paved depth, using hot or cold asphalt wearing course material, finish to a flush elevation, then seal the top with joint sealing material. In areas where bedrock is encountered and the post cannot be driven to grade, remove the post, then drill or excavate a hole of sufficient dimensions to the required depth. Fill the hole with Class A Cement Concrete, set the post to grade, then plumb and secure until the concrete has set.

shop-formed rail on curves having a radius of less than 150 feet. Do not punch, drill, cut, or weld in the field, except if directed for special conditions.

621.4MEASUREMENT AND PAYMENT—