Technical Specifications 2020 Pavement Preservation
Technical Specifications
A, SCOPE
The work covered by this section of the specification consists of furnishing all materials, labor,
transportation, equipment necessary, and traffic control including flaggers to perform all
operations in connection with the cleaning, sterilizing, removing vegetation, and sealing of
construction and random cracks in bituminous concrete pavements with an approved sealant
material. The Contractor shall furnish all materials, labor, traffic control, equipment, and
transportation necessary for work in accordance with the latest approved City of Nashua
Standard Specification for Road Construction, or the latest approved NHDOT Standard
Specifications for Road and Bridge Construction Section 413 - Hot Poured Crack Sealant. The
most stringent specification shall apply.
B. MATERIAL
Material shall be of the hot-poured type and be a product as included on the NHDOT Qualified
Products List - Hot Poured Crack Sealant, Type II (Item 413.1).
Cc. EQUIPMENT
Equipment used in the performance of the work shall be subject to approval by the Engineer, and
maintained in a satisfactory working condition at all times.
Air Compressor: Air compressors shall be capable of furnishing not less than 100 cubic feet of
air per minute at not less than 90 lbs. per square inch pressure at the nozzle. The compressor
shall be equipped with traps that will maintain the compressed air free of oil and water.
Melting Kettle: Melting kettles shall be of the double-boiler, indirect fired type. The kettle shall
be equipped with a metal shield beneath the firebox to protect the pavement. The space between
the inner and outer shells shall be filled with a suitable heat transfer oil or substitute having a
flash point of not less than 530°F. The kettle shall be equipped with a satisfactory means of
agitating the joint sealer to maintain a uniform temperature. This may be accomplished by
continuous stirring with mechanically operated paddles and/or by a circulating gear pump
attached to the heating unit. Kettles equipped with a rocking type agitation shall not be used, The
kettle shall be equipped with a thermostatic control calibrated between 200°F and 550°F,
Hot-Air Lances: Hot-air lances for blowing clean and drying cracks shall be an approved
propane gas burner and compressed air device that does not allow the flame to touch the
pavement.
BD. CONSTRUCTION
Preparation of Cracks: All cracks shall be hot-air lanced cleaned of dirt, vegetation, foreign
material, and loose edges.
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