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Asphalt Concrete Crack Leveling


Location
South Dakota
Publication Date
01/27/2020 11:41 AM EST
Closing Date
02/19/2020 12:00 PM EST
Issuing Organization
State of South Dakota - Department of Transportation
Solicitation Number
Description

Specifications include, but are not limited to: A. Surface Preparation: All surfaces shall be dry and free of all dirt, dust, grease, and loose material prior to application of the mastic. All surfaces shall be cleaned by the use of compressed air produced from an air-compressor with the capability of producing a minimum of 125 cfm (0.06 cubic meters per second) of clean, oil-free compressed air equipped with a maximum of a ¾ inch (20mm) diameter nozzle. The use of “backpack” type blowers is not allowed. In the event of surface temperatures falling below 40˚F (4˚C), a compressed air heat lance shall be used to thoroughly dry all moisture and heat the surface area as per the manufacturer’s recommendations. The compressed air heat lance shall produce a minimum temperature of 750˚F (399˚C) at a minimum velocity of 650 feet per second. The compressed air must be produced from an air-compressor with the capability of producing a minimum of 125 cfm (0.06 cubic meters per second) of clean, oil-free compressed air. The use of direct flame dryers will not be permitted. Caution shall be taken as to not overheat pavement surfaces. When recommended by the mastic manufacturer, a surface conditioner or primer approved by the mastic manufacturer shall be applied to the surfaces prior to placement of the asphalt repair mastic to promote increased surface adhesion to the existing pavement. If used, the surface conditioner or primer must thoroughly cover all surface areas where the asphalt repair mastic will be placed. The installation of the asphalt repair mastic will not take place until the surface conditioner or primer has cured to a “tacky” consistency. B. Installation: The Contractor must be trained and approved by the mastic manufacturer. The asphalt repair mastic shall be heated in a thermostatically controlled mastic mixer that utilizes oil as a heat transfer medium. The Mastic mixer must be equipped with a full sweep horizontal agitator capable of gently lifting the material from the bottom of the reservoir and turning the material over and over. The agitator shall be capable of mixing and suspending materials, filled with aggregates having a specific gravity as high as 3.0. The heated asphalt repair mastic will then be dispensed onto the properly prepared pavement recess, in layers if needed. Immediately following, a heated hand squeegee shall be used to level and smooth the repair mastic with the surrounding pavement surface until the material has formed a durable, well-bonded repair. The heated hand squeegee shall be kept free of material buildup to ensure a smooth, quality finished product. The asphalt repair mastic shall be applied to the applicable surface area from the bottom up in lifts appropriate to the specific application. Due to the depths of some of the repair locations, a minimum of two lifts may be required to obtain a level surface. In the event that multiple lifts are required, the first application should fill the work area to within 0.5" (12mm) to 1" (25mm) of the desired reservoir depth. The first lift shall be properly cooled before any subsequent lifts are applied. All excess material shall be removed from the roadway and properly disposed of. The Contractor shall cooperate with the Engineer to keep accurate running totals of the pounds of mastic used.

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