parts for rapid replacement and repair of vibrators shall be maintained at
the paving site at all times. Any evidence of inadequate consolidation
(honeycomb along the edges, large air pockets, or any other evidence) shall
require the immediate stopping of the paving operation and approved
adjustment of the equipment or procedures.
3.5.3
Operation
When the paver approaches a header at the end of a paving lane, a
sufficient amount of concrete shall be maintained ahead of the paver to
provide a roll of concrete which will spill over the header. The amount of
extra concrete shall be sufficient to prevent any slurry that is formed and
carried along ahead of the paver from being deposited adjacent to the
header. The spud vibrators in front of the paver shall be brought as close
to the header as possible before they are lifted. Additional consolidation
shall be provided adjacent to the headers by hand-manipulated vibrators.
When the paver is operated between or adjacent to previously constructed
pavement (fill-in lanes), provisions shall be made to prevent damage to the
previously constructed pavement. Screeds or extrusion plates shall be
electronically controlled from the previously placed pavement so as to
prevent them from applying pressure to the existing pavement and to prevent
abrasion of the pavement surface. The overlapping area of existing
pavement surface shall at all times be kept completely free of any loose or
bonded foreign material as the paver-finisher operates across it. When the
paver travels on existing pavement, approved provisions shall be made to
prevent damage to the existing pavement. Pavers using transversely
oscillating screeds shall not be used to form fill-in lanes that have
widths less than a full width for which the paver was designed or adjusted.
3.5.4
Required Results
The paver-finisher, and its gang-mounted vibrators, together with its
operating procedures shall be adjusted and operated and coordinated with
the concrete mixture being used to produce a thoroughly consolidated slab
throughout, true to line and grade within specified tolerances. The
paver-finishing operation shall produce a surface finish free of
irregularities, tears, voids of any kind, and any other discontinuities.
The paver-finisher shall make only one pass across the pavement; multiple
passes will not be permitted. The equipment and its operation shall
produce a finished surface requiring no hand finishing other than the use
of cutting straightedges, except in very infrequent instances. If any
equipment or operation fails to produce the above results, the paving shall
be stopped, the equipment shall be replaced or properly adjusted, the
operation shall be appropriately modified, or the mixture proportions
modified, in order to produce the required results before recommencing
paving. No water, other than fog sprays (mist) as specified in paragraph:
Prevention of Plastic Shrinkage Cracking, shall be applied to the concrete
or the concrete surface during paving and finishing.
3.5.5
Fixed Form Paving
**************************************************************************
NOTE: Fixed-form paving should always be included
as an option or mandatory item as appropriate. Edit
bracketed items in subparagraph a. Keys are only
permitted for roads and streets with a thickness of
230 mm (9 inches) or greater. Do not permit keys
for airfield pavements.
**************************************************************************
SECTION 02753
Page 57
Previous Page
