the pavement center line. The broom shall be capable of traversing the
full width of the pavement in a single pass at a uniform speed and with a
uniform pressure. Successive passes of the broom shall be overlapped the
minimum necessary to obtain a uniformly textured surface. Brooms shall be
washed thoroughly at frequent intervals during use. Worn or damaged brooms
shall be removed from the job site. Brooming should be completed before
the concrete has hardened to the point where the surface will be unduly
torn or roughened, but after hardening has progressed enough so that the
mortar will not flow and reduce the sharpness of the scores. The scores
shall be uniform in appearance and approximately 1.5 mm 1/16 inch in depth
but not more than 3 mm 1/8 inch in depth. Hand brooming will be permitted
only on isolated odd shaped slabs or slabs where hand finishing is
permitted. For hand brooming, the brooms shall have handles longer than
half the width of slab to be finished. The hand brooms shall be drawn
transversely across the surface from the center line to each edge with
slight overlapping strokes.
3.6.5.4
Wire-Comb Texturing
Surface texture shall be applied using an approved mechanical wire comb
drag operated to comb the surface transverse to the pavement center line.
The comb shall be capable of traversing the full width of the pavement in a
single pass at a uniform speed and with a uniform pressure. Successive
passes of the comb shall be overlapped the minimum necessary to obtain a
continuous and uniformly textured surface. Texturing shall be completed
before the concrete has hardened to the point where the surface and edges
will be unduly torn, but after hardening has progressed to the point where
the serrations will not close up. The serrations shall be 2 to 5 mm 1/16
to 3/16 inch deep, 1.5 to 3 mm 1/16 to 1/8 inch wide, and spaced 9.5 mm 3/8
inch apart. Transverse texturing shall produce grooves in straight lines
across each lane within a tolerance of plus or minus 12 mm 1/2 inch of a
true line.
3.6.5.5
Surface Grooving
The areas indicated on the drawings shall be grooved with a spring tine
drag producing individual grooves 6 mm 1/4 inch deep and 6 mm 1/4 inch wide
at a spacing between groove centerlines of 50 mm 2 inches. These grooves
shall be cut perpendicular to the centerline. Before grooving begins, the
concrete shall be allowed to attain sufficient strength to prevent
aggregate spalling. Grooves shall not be cut within 150 mm 6 inches of a
runway centerline, transverse joint, or crack; and they shall not be cut
through neoprene compression seals. Transverse texturing shall produce
grooves in straight lines across each lane within a tolerance of plus or
minus 12 mm 1/2 inch of a true line.
3.6.6
Edging
After texturing has been completed, the edge of the slabs along the forms,
along the edges of slipformed lanes, and at the joints shall be carefully
finished with an edging tool to form a smooth rounded surface of 3 mm 1/8
inch radius. Tool marks shall be eliminated, and the edges shall be smooth
and true to line. No water shall be added to the surface during edging.
Extreme care shall be taken to prevent overworking the concrete.
3.6.7
Outlets in Pavement
Recesses for the tie-down anchors, lighting fixtures, and other outlets in
the pavement shall be constructed to conform to the details and dimensions
SECTION 02753
Page 66
Previous Page
