SECTION 422 – FOG SEAL
422.01 Description
This section describes the requirements for furnishing and applying a fog seal surface treatment with a fine aggregate cover. This section also describes the requirements for applying a fog seal strip over centerline rumble strips (CLRS) and HMA longitudinal cold joints.
422.02 Materials
422.02.01 Materials
Provide materials as specified: Fine Aggregate for Fog Seal ................................ ................................ ................................ ..................... 901.07.02 1 Asphalt Emulsion. For fog seal surface treatment, fog seal of centerline rumble strips and HMA longitudinal cold joint provide, emulsified asphalt of grades RS-1 or RS-2 in accordance with AASHTO M 140; or provide cationic emulsified asphalt of grades CRS -1 or CRS -2 in accordance with AASHTO M 208; and ensure all emulsified asphalts are provided as specified in 902.01.02. 2 Polymerized Maltene Emulsion. As an alternative for asphalt emulsion specified above for fog seal strip of centerline rumble strips and HMA longitudinal cold joints, provide a polymerized maltene emulsion. All dilution must be done at the place of manufacture. Other emulsified asphalt designed specifically for fog sealing may be used if approved by the Bureau of Materials. Determine the application rate by the amount of residual asphalt required as specified in 422.03.01.E.
422.02.02 Equipment
Provide equipment as specified: Bituminous Material Distributor ................................ ................................ ................................ .................. 1003.07 Mechanical Sweeper ................................ ................................ ................................ ................................ ... 1008.03 Mechanical Fine Aggregate Spreader ................................ ................................ ................................ ........... 1012.02
422.03 Construction
422.03.01 Fog Seal Surface Treatment
A.Fog Sealing Plan. At least 20 days before beginning placement of fog sealing, submit a detailed plan of operation to the RE for approval that includes the following:
1.Fog sealing contractor’s superintendent’s qualifications with a list of at least 5 successful projects, including project owner contact information.
2.Size and description of crew.
3.Number, type, model of equipment and material control/metering devices alon g with the current calibration documentation.
4.Fog seal material type, dilution amount, manufacturer, MSDS, handling and installation guidelines, weather limitations and Quality Control plan.
5.Lighting plan for night operations as specified in 108.06 for paving.
6.Schedule, hours of operation, and production rates for the Project.
7.Plant or storage locations for fog sealing emulsion, sand and additives.
8.Method of maintaining fog-sealing emulsion temperature during transportation and operation.
9.Quality control plan outlining the material testing, number and frequency planned in order to ensure compliance.
10.Method of protecting manholes, valve boxes, drop inlets and other service entrances are protected from the fog sealing.
11.Method of protecting RPMs from fog sealing. Do not begin fog sealing until the RE approves the plan. Submit an adjusted fog sealing plan to the RE for approval before making adjustments to the fog sealing operation.
B.Weather Limitations. If within the 3 hours of fog sealing, the National Weather Service locally fo recasts a 40 percent chance or greater of precipitation during the scheduled placement, postpone the placement of fog seal. Do not fog seal if it is precipitating or when precipitation is imminent. The Contractor may resume fog sealing operations when the chance of precipitation is less than 40 percent, and the surface is dry. Do not place fog sealing if the surface temperature of the underlying pavement is below 50 °F.
C.Test Strip. Construct a test strip of at least 100 feet in length on the roadway before initial placement commences. Ensure the test strip is performed during weather and sunlight conditions which will represent project production placement of the fog sealing mixture. While constructing the test strip, record the following information and submit to the RE:
1.Ambient Temperature. Measure the ambient temperature at the beginning and end of the fog sealing operation.
2.Base Temperature. Measure the surface temperature of the existing pavement at the beginning and end of the fog sealing operation.
3.Weather Conditions. Document the wind speed, weather conditions, time of day, and humidity at the time of placement.
4.Emulsion Temperature. Measure the temperature of the emulsion in the distributor truck. Ensure that the emulsion is heated to the optimum application temperature as per the manufacturer prior to starting.
5.Application Rate Verification . With the RE present, check the application rate setting in the bituminous material distributor. With the RE present, verify the temperature of the fog sealing mixture during placement. With the RE present, verify application rate calibration using ASTM test method D 2995 except that the tiles should be 3 feet by 3 feet in dimension. After the emulsion has completely cured, weigh the tiles again to verify asphalt residual.
6.Set Time. Record the initial time of placement. Notify the RE when the material has completely set and is ready to be opened to traffic.
7.Performance Under Traffic. Do not allow traffic on the fog seal until it has completely cured. Verify that the fog sealing shows no visual signs of distress when exposed to traffic. Upon completion of the test strip, submit test strip documentation to the RE. The RE will review the test strip documentation and visually assess the coverage of the fog seal application. Do not proceed with production fog sealing until receiving approval from the RE. Before making adjustments to the fog sealing operations, notify the RE in writing. The RE may require a new test strip to verify the performance of the adjusted fog sealing operations.
D.Surface Preparation. Ensure all repairs and rumble strips are completed prior to beginning fog seal installation. Clean the surface of existing pavement to remove all dust debris, oil and any other materials that may prevent bonding of the fog seal. Ensure that the surface is clean and dry. Remove traffic stripes and traffic markings as specified in
610.03 08.
Ensure that manholes, inlets, utilities, curbs, RPM s, structures, traffic striping, and traffic markings to remain are protected from the fog seal by methods approved by the RE. Do not proceed with placement of the fog seal until the RE approves the prepared surface.
E.Fog Sealing Application. Ensure that the temperature of the emulsion prior to starting is at the application temperature recommended by the manufacturer but not exceeding 160 °F. Apply the fog seal uniformly at the rate determined during the test strip to provide a residual asphalt of between 0.06 to 0.10 gallons per square yard using a bituminous distributer. Ensure that the fog seal material completely covers the pavement surface and is not streaked or ribboned. Ensure that the distribution is even with no uncoated areas or puddles of excess emulsion. Correct uncoated or lightly coated areas by applying additional fog seal emulsion. Blot areas showing an excess of fog seal with sand approved by the RE. Remove excess sand and emulsion material. In areas inaccessible to distributor spray bars, use hand spraying equipment. The RE may reject areas where fog seal has been applied that is uncoated, ribboned, streaked or has excess emulsion material and rendered unsatisfactory. Visual inspection by the RE is considered sufficient grounds for such rejection.
F.Fine Aggregate Application. Immediately after the fog seal has been applied, apply fine aggregate at a rate of 0.25 to 0.5 pounds per square yard. Ensure sand is applied uniformly over the area where fog seal has been applied. Remove excess material by sweeping prior to opening to traffic. The RE may reject area s where fine aggregate has been applied that is not sufficiently covered or has excess fine aggregate material and rendered unsatisfactory. Visual inspection by the RE is considered sufficient grounds for such rejection.
G.Opening to Traffic. Allow the material sufficient curing time, as recommended by the manufacturer, before opening to traffic. Sweep to remove loose and excess aggregate by methods approved by and to the satisfaction of the RE before opening to traffic.
H.Applying Striping and Traffic Markings. Allow fog seal to cure for at least 14 days before applying permanent traffic striping and traffic markings. Use temporary traffic striping and markings as directed by the RE until the fog seal has cured.
I.Surface Quality Requirements. Ensure that there is no excess buildup, uncovered areas, or rough areas on the fog seal. The RE will visually inspect the fog seal for approval. The RE may reject areas of fog seal that are unsatisfactory based on visual inspection. Areas where fog seal has been applied that do not have sufficient aggregate cover or have excess aggregate material may be rendered unsatisfactory. Correct areas of the fog seal that the RE rejects. Visual inspection by the RE is considered sufficient grounds for such rejection.
422.03.02 Fog Seal Strip
A.Fog Sealing Plan. At least 20 days before beginning placement of fog sealing, submit a detailed plan of operation to the RE for approval as specified in 422.03.01.A.
B.Weather Limitations. Fog seal in weather as specified in 422.03.01.B.
C.Test Strip. Construct a test strip of at least 100 feet in length on the roadway before initial placement commences as specified in 422.03.01.C, except that the tiles as specified in 422.03.01.C.5 should be 2 feet by 2 feet in dimension.
D.Surface Preparation. Prepare the existing surface as specified in 422.03.01.D. When using polymerized maltene emulsion, the Contractor may leave the existing traffic stripes and traffic markings in place and may install new traffic stripes and markings as specified in 610.03 prior to fog seal.
E.Fog Sealing Application. Ensure that the temperature of the asphalt emulsion prior to starting is at the application temperature recommended by the manufacturer but not exceeding 160 °F. If using asphalt emulsion, apply the fog seal uniformly at the rate determined during the test strip to provide a residual asphalt of between 0.06 to 0.10 gallons per square yard using a bituminous distributer. If using polymerized maltene emulsion, apply according to manufacturer’s recommendations. Apply fog seal in a 2 feet wide strip centered over the center line rumble strip or HMA longitudinal cold joint, ensuring complete coverage of the rumble strip or HMA longitudinal cold joint. Ensure that the fog seal material completely covers the pavement surface and is not streaked or ribboned. Ensure that the distribution is even with no uncoated areas or puddles of excess emulsion. Correct uncoated or lightly coated areas by applying additional fog seal emulsion. Blot areas showing an excess of fog seal with sand approved by the RE . Remove excess sand and emulsion material. In areas inaccessible to distributor spray bars, use hand spraying equipment. The RE may reject areas where fog seal has been applied that is uncoated, ribboned, streaked or has excess emulsion material and rendered unsatisfactory. Visual inspection by the RE is considered sufficient grounds for such rejection.
F.Applying Striping and Traffic Markings. If using asphalt emulsion, place striping as specified in 159.03.06 prior to opening to traffic. If permanent striping was not applied prior to fog sealing, a llow fog seal to cure for at least 14 days before applying permanent traffic striping and traffic markings.
G.Opening to Traffic. Open to traffic as specified in 422.03.01.G. H Surface Quality Requirements. Ensure fog seal strip meets the requirements specified in 422.03.01.I.
422.04 Measurement and Payment
The Department will measure and make payment for Items as follows: Item Pay Unit FOG SEAL SURFACE TREATMENT GALLON FOG SEAL STRIP LINEAR FOOT The Department will not include payment for removal of traffic stripes, removal of traffic makings, epoxy traffic stripes, epoxy traffic marking, lines, epoxy traffic markings, symbols, and epoxy traffic markings, route symbols in FOG SEAL SURFACE TREATMENT and FOG SEAL STRIP . The Department will pay for removal of traffic stripes, removal of traffic makings, epoxy traffic stripes, epoxy traffic marking, lines, epoxy traffic markings, symbols , and epoxy traffic markings, route symbols under REMOVAL OF TRAFFIC STRIPES, REMOVAL OF TRAFFIC MARKINGS, TRAFFIC STRIPES EPOXY, TRAFFIC MARKINGS LINES, EPOXY, TRAFFIC MARKINGS SYMBOLS, EPOXY , and TRAFFIC MARKINGS ROUTE SYMBOLS, EPOXY as specified in 610.04 respectively. The Department will not include payment for latex traffic stripes, latex traffic markings lines , and latex traffic markings symbols in FOG SEALSURFACE TREATMENT and FOG SEAL STRIP . The Department will pay for latex traffic stripes, latex traffic markings lines , and latex traffic markings symbols under TRAFFIC STRIPES, LATEX, TRAFFIC MARKINGS LINES, LATEX, and TRAFFIC MARKINGS SYMBOLS, LATEX as specified in 159.04 respectively. The Department will measure FOG SEAL SURFACE TREATMENT by volume of residual asphalt by converting the quantity of emulsion to the number of gallons at 60 °F as calculated by the temperature-volume correction factors specified in 902.01 and then multiplying by the percent residual asphalt in the emulsion from the certificate of compliance from the manufacturer.
Referenced in this section
Fog Seal in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 231–234 of 651. View official source ↗