Gavins Point Crest Road Chip Seal

Crest Road Asphalt Surface Treatment and Joint Sealant/Repair Gavins Point Project Appendix “B” SDDOT Technical Specification STANDARD SPECIFICATIONS FOR ROADS AND BRIDGES Version: 10-1-2025 SOUTH DAKOTA DEPARTMENT OF TRANSPORTATION -- 1 of 46 -- 330 Page 196 330 PRIME, TACK, FOG SEAL, AND FLUSH SEAL 330.1 DESCRIPTION This work consists of preparing and treating a prepared surface with asphalt material and sand as required. 330.2 MATERIALS Materials will conform to the following Sections: A. Asphalt: Section 890. B. Blotting Sand for Prime: Section 879. C. Sand for Flush Seal: Section 879. D. Sand for Fog Seal: Section 879. 330.3 CONSTRUCTION REQUIREMENTS A. Weather and Seasonal Requirements: Application will be made only during daylight hours, when the wind does not adversely affect the spraying operation and when the following conditions are met: 1. Asphalt for Prime: The application of asphalt for prime will be permitted only: a. When the ambient air and surface temperatures on the project are both at least 60 F in the shade. b. When conditions are dry. When plans call for prime on interim surfacing, the prime application will closely follow the base finishing operation and at no time will the prime operation be more than 3 miles from the base finishing operation. The cure time for the processed base, prime, and blotting sand application will be determined by the Engineer. Surfaces primed with cutback asphalt will be allowed to cure for a minimum of 72 hours prior to being overlaid with asphalt concrete. 2. Asphalt for Tack: The application of asphalt for tack will be permitted only: a. When the ambient air and surface temperature on the project are both at least 35 F in the shade. b. When conditions are dry, except emulsified asphalt may be applied when the surface is slightly damp. -- 2 of 46 -- 330 Page 197 3. Asphalt for Fog Seal: The application of asphalt for fog seal will be permitted only: a. When the ambient air and surface temperature on the project are both at least 60 F in the shade. b. When conditions are dry. c. Fog seal application will begin after the asphalt surface treatment is cured and will not begin prior to completing final brooming. Fog seal application will be completed no later than 7 calendar days following asphalt surface treatment application. 4. Asphalt for Flush Seal: The application of asphalt for flush seal will be permitted only: a. Between May 1 and November 1, inclusive. b. When ambient air and surface temperatures on the project are both at least 50 F in the shade. c. When the surface is dry or slightly damp. B. Dilution of Tack, Fog Seal, and Flush Seal: Emulsified asphalt for tack, fog seal, and flush seal with a specified application rate of 0.07 gallons per square yard or less may be diluted. The rate of dilution for tack will be at a ratio of at least 1 part emulsion to no more than 1 part added water (1:1 ratio minimum) by volume, unless otherwise approved by the Engineer. The rate of dilution for fog seal and flush seal will be at a ratio of not more than 3 parts emulsion to 1 part added water (3:1 ratio maximum) by volume to not less than 1 part emulsion to 1 part added water (1:1 ratio) by volume, unless otherwise approved by the Engineer. The emulsion will be uniformly mixed by adding potable water and if necessary, agitating the mixture. The amount of emulsion and any added water will be included on the ticket delivered to the project. If the emulsion is diluted, the emulsified asphalt supplier will perform the dilution. Dilution of asphalt emulsion in the field will not be allowed unless approved by the Engineer. Field dilution of the emulsified asphalt will only be allowed when the rate of dilution is accurately controlled and reported to the Engineer. Field dilution will be performed as recommended by the emulsified asphalt supplier. The final rate of dilution will not be less than the minimum ratio of at least 1 part emulsion to no more than 1 part added water (1:1 ratio minimum). Diluted emulsified asphalt for tack, fog seal, and flush seal will be applied at an adjusted rate proportional to the dilution ratio resulting in application of the specified rate of emulsion. Emulsified asphalt for tack, fog seal, or flush seal with a specified rate exceeding 0.07 gallons per square yard will not be diluted. -- 3 of 46 -- 330 Page 198 The storage tank for diluted emulsified asphalt must utilize a recirculation system or agitator that will prevent settlement or separation of the material. C. Equipment: The following minimum equipment will be furnished by the Contractor. 1. Brooms: a. Pickup Broom: In curb and gutter sections or in rural sections where a finished and maintained lawn extends to the edge of the shoulder, the Contractor must use a pickup broom with an integral self-contained storage. The pickup broom must be a minimum of 6 feet wide. The sweeping operation must remove all loose material, including loose material from the gutter. b. Rotary Power Broom: A rotary power broom may be used in all other areas. 2. Heating Equipment: Equipment for heating the asphalt material in or at the tank car, transport truck, or distributor will be designed and constructed to heat the material without burning, scorching, or overheating, and with positive control of the heat. The introduction of steam directly into the material will not be permitted. 3. Distributors: Distributors used to apply the asphalt material will be self-propelled, equipped with pressure type mechanical circulating pumps and valves, a heating system and insulated tank, which will provide the uniform required temperature throughout the entire contents of the distributor tank. The distributor will have a capacity of at least 800 gallons. Detachable distributor units separate from the tank will not be allowed. The distributor will uniformly apply the heated asphalt material to the road surface in accurately measured quantities …