PART 3
EXECUTION
3.1
EQUIPMENT
Assemble at the site of the work sufficient equipment that is dependable,
appropriate and adequate to accomplish the work specified. Deliver the
equipment a sufficient time before the start of repairs to permit thorough
inspection, calibration of weighing and measuring devices, adjustment of
parts, and the making of any repairs that may be required. Machines,
tools, and equipment used in the performance of the work shall be approved
before the work is started and shall be maintained in satisfactory
condition at all times. Maintain the equipment in good working condition.
Provide dust suppression on equipment as needed to comply with Section
01355A ENVIRONMENTAL PROTECTION.
3.1.1
Cement-Based Concrete Mixing Equipment
Mixing equipment shall conform to the requirements of Section [03300A
CAST-IN-PLACE STRUCTURAL CONCRETE][03301A CAST-IN-PLACE STRUCTURAL CONCRETE
FOR CIVIL WORKS][Section 03307 CONCRETE FOR MINOR STRUCTURES].
3.1.2
Polymer-Modified Concrete Mixing Equipment
Use proportioning and mixing equipment with capacity and continuous rate so
that final finishing can be completed prior to the formation of a plastic
film on the polymer-modified concrete surface. The equipment shall
consistently produce a uniformly blended mixture within the specified air
content and slump limits. The mixer shall also:
a. Be equipped with a recording meter with a ticket printout device to
record an indication of the cement quantity being introduced into the
mix. The metering device shall be accurate within a tolerance of -1 to
+3 percent.
b. Be equipped with a polymer metering device to indicate volume
dispensed. The metering device shall be accurate within a tolerance of
-1 to +2 percent. In addition the polymer tank shall have a stand pipe
marked in litersgallons.
c. Be equipped with a water flow indicator, and have a water flow
control that is readily adjustable to provide for minor variations in
aggregate moisture content. The flow indicator shall be accurate
within a tolerance of plus or minus 1 percent in the range of expected
use.
d. Be equipped with a control to regulate the quantity of each of the
polymer-modified concrete components to permit production of a mix
having the specified composition. To ensure that the mixer can
accurately proportion and blend all components of the polymer-modified
concrete on a continuous or intermittent basis, the mixer shall be
calibrated prior to the start of the overlay placement.
3.1.3
Epoxy Mixing Equipment
Use a container recommended by the epoxy manufacturer as the mixing vessel.
Use a power drive (air or spark-proof) propeller type blade for mixing
except that hand mixing may be used for small batches. Use equipment
specified by epoxy manufacturer for field mixing of aggregates and epoxy
resin.
SECTION 03931
Page 47
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