2355Bituminous Fog Seal

2355.1DESCRIPTION

This Work consists of constructing a fog seal on a prepared surface as shown on the P lans.

2355.2MATERIALS

A Bituminous Material A.1 CSS-1h .......................................................................................................... 3151.2D.1.a A.2 CRS-2Pd ........................................................................................................... 3151.2E.2

2355.3CONSTRUCTION REQUIREMENTS

A Weather Limitations Perform fog seal operations only during daylight hours and not during foggy weather . Begin fog seal operations when the pavement and air temperatures are 60°F and rising. The Contractor may perform fog sealing on a damp Road surface, but not on a Road surface with standing water. B Road Surface Preparation Clean pavements, including depressions, before fog sealing. Cover metal surfaces and other utility Structures in the Roadway to prevent adherence of the bituminous Material. Remove the protective coverings before opening the Road to traffic. C Application of Bituminous Material Provide bituminous Material as shown in the Plans. Field dilution is not allowed. Begin using the rate of application for bituminous fog seal as shown in Table 2355.3-1 and within the temperatures specified in Table 2355.3-2. Demonstrate a uniform application of asphalt emulsion producing 100 percent coverage of the surface after curing, as approved by the Engineer. Stop operations if the application demonstration does not meet the coverage requirements. Minimize the amount of overspray during the fog seal operation. Using a distance of 1,000 feet perform a yield check at the beginning of each Project to verify the application rate is correct. The Engineer may require additional yield checks be performed if the application rate is questioned. The Engineer may also require the Contractor to verify application is within 10 percent of the intended application rate by ASTM D2995, Standard Practice for Estimating Application Rate and Residual Application Rate of Bituminous Distributors, test method A.

Table 2355.3-1 Fog Seal Application Rates Application Rates -- gallons/square yard CSS-1h CRS-2Pd 0.05 to 0.20 0.05 to 0.20

Table 2355.3-2 Fog Seal Application Temperatures Bituminous Material Minimum Temperature Ideal Temperature CRS-2Pd 140°F 170°F – 180°F CSS-1h 100°F 100°F – 140°F D Protection of the Surface Do not allow traffic on the fog sealed surface until after the bituminous Material has set and will not pick up on vehicle tires. E Equipment E.1 Distributor ................................................................................................... 2360.3B.2.d E.2 Brooms Provide motorized brooms with a positive means of controlling vertical pressure and with the capability to clean the Road surface prior to spraying bituminous Material.

2355.4METHOD OF MEASUREMENT

The Engineer will measure the diluted bituminous Material for fog seal by volume, at 60°F.

2355.5BASIS OF PAYMENT

The Department will pay for fog seal on the basis of the following schedule: Item No. Item Unit

2355.506 Bituminous Material for Fog Seal gallon