Technical Specifications | IFB0660-040617
2017 Pavement Preservation
Revised per Addendum #1
Tensile Strength (ASTM D2256-90) >70,000 psi
Diameter 0.0008 in. **
Specific Gravity (ASTM D792-91) 1.32 to 1.40
* At temperatures ranging from ambient to maximum finished product mix
temperature
** Subject to Normal Variations
The modified asphalt-fiber compound shall be mixed at a rate of 8% fiber weight to weight of
asphalt cement. This compound having the same chemical base provides compatibility and
exhibits excellent bond strengths. The fiber functions to re-distribute high stress and strain
concentrations that are imposed on the sealant by thermal sources, traffic loading, etc.
C, EQUIPMENT
Equipment used in the performance of the work required by this section of the specification shall
be subject to approval by the Owner, 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 Ibs. 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.
Manually operated, gas powered air-broom or self-propelled sweeper: It shall be designed
especially for use in cleaning highway and airfield pavements shall be used to remove debris, dirt
and dust from the cracks.
Melter: The unit used to melt or maintain the crack sealant compound at the recommended
application temperature shall be the indirect fired type. It shall be equipped with a remote heat
exchanger and hot oil circulation pump capable of maintaining a consistent temperature of the
heat transfer oil. The heat transfer oil shall be circulated to all sides and the bottom of the vat
containing the crack sealant compound making a continuous loop back to the heat exchanger and
having a flash point of not less than 600 degrees F. The melter shall be equipped with a
satisfactory means of agitating the crack sealant at all times. This may be accomplished by
continuous stirring with mechanically operated paddles and/or by a circulating gear pump
attached to the melter. The melter must be equipped with a thermostatic control calibrated
between 200 degrees F and 550 degrees F, and must be capable of pumping an 8% fiber content
blend. ;
D. CONSTRUCTION
Preparation of Cracks
All cracks shall be blown clean and sterilized by use of a propane air torch generating 2,000
degrees F and 3,000 feet/second velocity to eliminate all vegetation, dirt, moisture and seeds. All
debris removed from the cracks shall be removed from the pavement surface immediately by
means of a power sweeper, hand or air broom.
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