Section 27 – Curbs, Gutters, Sidewalks, and Drainage Structures
12/1/03
27.4
At the Contractor's option, or at the direction of the Agency, extruded concrete curbs shall
be anchored to existing pavement either by placing dowels and reinforcing or by using an
approved adhesive. If an adhesive is used, in advance of placing the curbs on the existing
pavement, the surface of the pavement shall be thoroughly cleaned and the adhesive shall be
applied. The pavement shall be cleaned either by wire brushing or by blast cleaning. The
cleaned surface shall be free from dust, loose material, or oil.
The adhesive shall be an epoxy resin adhesive conforming to Section 95-2.03, “Epoxy
Resin Adhesive for Bonding New Concrete to Old Concrete”, of the State Specifications. Such
adhesive may also be used for bonding new portland cement concrete to existing asphalt
concrete.
The top and face of the finished curbs shall be true and straight and the top surface of curbs
shall be of uniform width, free from humps, sags, or other irregularities. Grade tolerance of the
gutter flowline, back of curb and gutter, and back of sidewalk shall not exceed ± 0.05 foot in any
twenty-five-foot (25’) length.
Concrete shall be fed to the machine at a uniform rate. The machine shall be operated
under sufficient uniform restraint to forward motion to produce a well compacted mass of
concrete free from surface pits and requiring no further finishing, other than light brooming with
a broom filled with water only. Finishing with a brush application of grout will not be permitted.
In extruded construction, deep-score lines may be placed in curbs, gutters and sidewalks in
lieu of expansion joints. Deep-score lines shall be one and one-half inches (1-1/2”) deep and
one-eighth inch (1/8”) to one-quarter inch (1/4”) wide. For six-foot (6’) wide sidewalks deep-
score lines shall be placed every ten feet (10’) with a standard control score line every five feet
(5’) between deep-score lines, and for four-foot (4’) wide sidewalks deep-score lines shall be
placed every twelve feet (12’) with a standard control score line every four feet (4’) between
deep-score lines. For sidewalk widths other than four feet (4’) or six feet (6’), deep-score lines
and control score lines shall be placed at the direction of the Agency. Expansion joints in
conformance with the requirements of Section 27-3.01, “Expansion Joints, Weakened Plane
Joints, and Score Marks”, in this Section of these Specifications shall be placed at sixty-foot
(60’) maximum spacing, and at curb returns, light poles, fire hydrants, both sides of driveways,
and other fixed objects, or as directed by the Agency. Deep-score lines and control score lines
shall conform to the details shown on the Standard Drawings. In addition, dowels or keyways
shall be placed at the end of concrete placement, each day, with a deep-score line placed at the
cold joint.
27-8 CURB RAMPS AND DRIVEWAYS
Curb ramps and driveways shall be constructed to the dimensions, lines, grades, and details
shown or specified in the Contract. Curb ramps and driveways shall conform to all requirements
in these Specifications, including the requirement for excavating for and placing the six-inch (6”)
thick Class II aggregate base section. No utility pull box, utility pole, traffic signal pull box, traffic
signal pole foundation, or any other facility that is visible on or above the surface of a curb ramp
may be located within the area of a curb ramp. For the purpose of this Section, the area of the
curb ramp shall be the area including and bounded by the one-foot (1’) wide tactile strip on
either side of the inclined portion of the ramp, the gutter section and the curb along the back of
sidewalk.
27-9 RECONSTRUCTION OF CURBS, GUTTER, AND SIDEWALK TO ACCOMMODATE
DRIVEWAYS
Where curb and gutter and/or sidewalk are to be removed for the purpose of constructing a
driveway, a sidewalk ramp, utility relocation or construction of utility facilities, or to replace
cracked, broken, heaved or otherwise unacceptable concrete, the entire curb and gutter and/or



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