Section 27 – Curbs, Gutters, Sidewalks, and Drainage Structures
12/1/03
27.2
conform to Section 50-4, “Premoulded Expansion Joint Filler”, of these Specifications.
Expansion joints shall be at right angles to the line of the work.
All four-foot (4’) wide sidewalks shall be scored at four-foot (4’) intervals. In lieu of every
third score mark, at twelve foot (12’) intervals, weakened plane joints shall be constructed. In
lieu of every fifth weakened plane joint, at sixty-foot (60’) intervals, expansion joints shall be
constructed as detailed above.
All six-foot (6’) sidewalks shall be scored at five-foot (5’) intervals. In lieu of every other
score mark, at ten-foot (10’) intervals, weakened plane joints shall be constructed. In lieu of
every sixth weakened plane joint, at sixty-foot (60’) intervals, expansion joints shall be
constructed as detailed above.
Weakened plane joints shall extend through both the sidewalk and the curb and gutter when
constructed at the same time and monolithically. Curb and gutter constructed without monolithic
sidewalk construction shall be constructed with weakened plane joints at ten-foot (10’) intervals
and expansion joints at sixty-foot (60’) intervals.
Weakened plane joints shall be one-quarter of an inch (1/4") thick and shall extend to a
depth of one and one-half inches (1-1/2"). The surface of weakened plane joints shall be
finished with tooled edges with a radius of one-quarter of an inch (1/4").
Weakened plane joints shall also be constructed through the sidewalk, curb, and gutter at
four locations at each standard sidewalk ramp as shown on Drawing 4-23. Weakened plane
joints shall be constructed through the sidewalk, curb, and gutter on both sides of catch basins.
27-3.02 Finishing Concrete Surfaces
The top and exposed surface of the concrete curb shall be finished as follows:
•
A direct finishing method, whereby the curb concrete shall be placed to exact form,
double screeded, floated, troweled and smoothly finished, after which it shall be
broomed with a fine hair push broom drawn over the surface transverse to the line of
work. Water may be applied to the surface immediately in advance of brooming.
•
Surfaces of sidewalks shall be finished by double screeding, which shall include
working the concrete until the coarse aggregate is forced down into the body of the
concrete and a layer of mortar is thus forced to the top for floating, and troweling.
The surface shall then be marked as directed by the Agency, and broomed as
described above.
All exposed surfaces of sidewalks, curbs, and gutters shall be free from rock pockets,
discoloration, graffiti, and blemishes. Surfaces shall have a uniform texture and appearance
free of bulges, depressions, or other imperfections. Surfaces shall not vary by more than one-
quarter of an inch (1/4") from a ten-foot (10’) straight edge except at grade changes.
27-3.03 Curing of Concrete
Curing of concrete in curbs, gutters, and sidewalks shall be with pigmented compound as
specified in Section 50-6, “Curing Compounds for Concrete”, of these Specifications. The
curing compound shall be applied as recommended by the manufacturer. Curing compound is
to be completely and uniformly applied to the exposed surfaces of the concrete such that the
compound leaves a neat appearance. Median islands shall have white-pigmented compound.
The Contractor shall take care that the pigmented compound is contained within the intended
area of work and does not discolor asphalt concrete or other adjoining improvements.
27-3.04 Allowance for Signs in Median and Traffic Islands
At each end of all new medians and traffic islands, the Contractor shall place a four-inch (4”)
diameter PVC pipe, aligned vertically and cut flush with surface grade of the median. Pipes
shall extend from the surface grade of the median to the pavement surface. Pipes shall be
centered in the medians and shall be located approximately two feet (2’) from the ends of the
medians. Pipes shall be left unfilled and will be used by Agency forces for installation of



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