from use until properly repaired and adjusted, or replaced.
3.4.2
Transporting and Transfer - Spreading Operations
Non-agitating equipment shall be used only on smooth roads and for haul
time less than 15 minutes. Concrete shall be deposited as close as
possible to its final position in the paving lane. All equipment shall be
operated to discharge and transfer concrete without segregation. In no
case shall dumping of concrete in discrete piles be permitted. No transfer
or spreading operation which requires the use of front-end loaders, dozers,
or similar equipment to distribute the concrete will be permitted. All
batching and mixing, transporting, transferring, paving, and finishing
shall be properly coordinated and controlled such that the paver-finisher
has a continuous forward movement at a reasonably uniform speed from
beginning to end of each paving lane, except for inadvertent equipment
breakdown. Failure to achieve this shall require the Contractor to halt
operations, regroup, and modify operations to achieve this requirement.
3.5
PAVING
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NOTE: Designer must correlate these paragraphs with
paragraph EQUIPMENT.
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3.5.1
General Requirements
Pavement shall be constructed with paving and finishing equipment utilizing
rigid fixed forms or by use of slipform paving equipment. Paving and
finishing equipment and procedures shall be capable of constructing paving
lanes of the required width at a rate of at least 30 m 100 feet of paving
lane per hour on a routine basis. Paving equipment and its operation shall
be controlled, and coordinated with all other operations, such that the
paver-finisher has a continuous forward movement, at a reasonably uniform
speed, from beginning to end of each paving lane, except for inadvertent
equipment breakdown. Workmen with foreign material on their footwear or
construction equipment that might deposit foreign material shall not be
permitted to walk or operate in the plastic concrete. Where an open-graded
granular base is required under the concrete, the Contractor shall select
paving equipment and procedures which will operate properly on the base
course without causing displacement or other damage.
3.5.2
Concrete shall be consolidated with the specified type of lane-spanning,
gang-mounted, mechanical, immersion type vibrating equipment mounted in
front of the paver, supplemented, in rare instances as specified, by
hand-operated vibrators. The vibrators shall be inserted into the concrete
to a depth that will provide the best full-depth consolidation but not
closer to the underlying material than 50 mm 2 inches. Excessive vibration
shall not be permitted. If the vibrators cause visible tracking in the
paving lane, the paving operation shall be stopped and equipment and
operations modified to prevent it. Concrete in small, odd-shaped slabs or
in isolated locations inaccessible to the gang-mounted vibration equipment
shall be vibrated with an approved hand-operated immersion vibrator
operated from a bridge spanning the area. Vibrators shall not be used to
transport or spread the concrete. Hand-operated vibrators shall not be
operated in the concrete at one location for more than 20 seconds. For
each paving train, at least one additional vibrator spud, or sufficient
SECTION 02753
Page 56
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