Emulsion Pump
The emulsion pump shall be a heated, positive displacement type pump.
Spreading Equipment
The surfacing mixture shall be spread uniformly by means of a mechanical type spreader box
attached to the mixer, equipped with paddles to agitate and spread the materials throughout the
box. The spreader box width shall be capable of adjustment while paving in order to
accommodate the changing width of some roadways without excessive overlaps. A front seal
shall be provided to insure no loss of the mixture at the road contact point. The rear seal and
secondary strike-off shall act as the final strike-off, and both shall be adjustable. The mixture
shall be spread to fill cracks and minor surface irregularities, and leave a uniform skid resistant
application of material on the surface. The spreader box and rear strike-off shall be so designed
and operated that a uniform consistency is achieved to produce a free flow of material to the rear
strike-off. The longitudinal joint where two passes join shall be neat in appearance, uniform and
lapped. All excess material shall be removed from the jobsite prior to opening the road. The
spreader box shall have suitable means provided to side-shift the box to compensate for
variations in pavement width and longitudinal alignment.
A rut box shall be available to pre-fill wheel ruts when necessary prior to overlay to eliminate
puddles or runoff interruption. The rut box shall be no less than 4’ wide and no more than 6’
wide.
Auxiliary Equipment
Suitable surface cleaning equipment, traffic control equipment, hand tools and any support
equipment shall be provided as necessary to perform the work.
Screening Plant
All aggregate shall be rescreened immediately prior to being loaded onto micro-surfacing
equipment. The screening plant shall be equipped with a 3/8” screen to remove all oversized
aggregate, and shall be capable of discharging screened aggregate directly onto the support
equipment. Any material discharged onto the ground must be rescreened prior to use.
Machine Calibration
Each mixing unit to be used in the performance of the work shall be calibrated in the presence of
the Engineer prior to construction, or previous calibration documentation covering the exact
materials to be used may be acceptable provided they were made during the same calendar year.
The documentation shall include the individual calibration of each material at various settings,
which can be related to the machine metering devices.
E. WEATHER LIMITATIONS
The material shall be spread only when the road surface and atmospheric temperatures are at
least 45 degrees F and rising, the weather is not rainy, and there is no forecast of temperatures
below 32 degrees F within 48 hours from the time of placement of the mixture.
