521TRANSVERSE JOINT CLEANING AND SEALING

521.1DESCRIPTION—This work is the cleaning and sealing existing transverse joints in cement concrete

pavements and shoulders.

521.2MATERIAL—

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

• Joint Backing Material—Section 705.8

521.3CONSTRUCTION—Completely remove all existing joint sealing material, neoprene compression

seals, asphalt material, and other foreign material in a manner that provides a clean, newly exposed concrete surface. Clean to a minimum depth of 1 1/2 inches. Immediately before placing backer rod, clean the joint faces. For air blasting, use a compressed air stream of at least 100 pounds per square inch measured at the source. Use air free of oil, moisture, and other contaminants. Immediately before sealing the joint, place the backer rod to a depth where the top of the rod is one to two times the width of the joint opening plus 1/4 inch below the pavement surface to allow a recessed sealant depth to width ratio of 1:1 to 2:1. Use a backer rod 25 to 35 % larger in diameter than the joint opening. Seal joint as specified in Section 501.3(n) and as follows:

• Do not place sealant unless joint is clean and dry.

• Do not place joint sealant unless the ambient air and the pavement temperatures are 40F or greater.

• Fill the joint reservoir to a level of 1/8 inch to 1/4 inch below the pavement surface.

521.4MEASUREMENT AND PAYMENT—Linear Foot