2010 Construction and Material Specifications - Ohio Department of ...

461
609.04
portions of adjacent sections of curbing with 1/8-inch (3 mm) thick expansion joint
material. Trim expansion joint material flush with the curbing on all edges.
If placing sandstone curb after placing pavement, fill remaining joints with dry
sand to within 2 inches (50 mm) of the surface of the pavement, and fill to the
pavement surface with asphalt concrete. Take care in filling this joint so that no
asphalt concrete comes in contact with the exposed surface of the curb.
D. Reusing Existing as New Curb. If specifically allowed by the plans, and to
the extent available, use acceptable stone curb sections removed under Item 202
instead of furnishing new stone curb. Use salvaged curb at locations designated by
the Engineer. Place all salvaged sections of curb continuously without
interspersing salvaged and new curb sections. Haul and store salvaged curb as
necessary. Cut, dress, set, and install joints in salvaged curbs according to the
requirements for new curbs.
609.04 Cast-in-Place Concrete Curb and Combination Curb and Gutter.
A. Forms and Joints. Use approved steel forms for curbs. Securely brace and
hold forms to the line and grade shown on the plans. The Contractor may use
approved flexible forms of steel or wood to construct the radius of a circular curb
200 feet (60 m) or less. Immediately before placing concrete, clean the inner
surface of the forms, and coat this surface with a form release agent.
Where curb and combination curb and gutter is not constructed integral with,
or tied to, the base or pavement, construct 1/4-inch (6 mm) wide contraction joints
at 10-foot (3 m) intervals using steel separator plates, a grooving tool, or a saw
according to Item 451. For combination curb and gutter, construct the joint to an
average depth of 2 inches (50 mm) or more. For curb, construct the joint to an
average depth of one-fifth or more of the curb height. Where expansion joints
occur in the abutting pavement, separate the section being placed with 1-inch (25
mm) 705.03 preformed filler.
Where the curb is integral with, or tied to, the base or pavement, construct
the same type of joints as used in the pavement. Space joints identically with the
joints in the base or pavement.
Leave curb forms in place until their removal will not crack, shatter, or
otherwise injure the concrete. Do not seal transverse joints in cast-in-place
concrete curb and combination curb and gutter.
If curbs are to later serve as a support for a finishing machine in the placing
of a surface course, align supporting edges so that the distance between the curbs
is within 1/2 inch (13 mm) from that specified.
B. Placing. Place concrete in forms prepared as described above, and vibrate
the concrete to eliminate all voids.
Place concrete for curb that is integral with the concrete base or pavement
while the base or pavement concrete is plastic. Where the presence of the
finishing equipment on the forms at the end of the day’s run prevents completing
the curb, install No. 5 (No. 16M) tie bars vertically in the pavement at 1-foot (0.3
m) intervals and in a line 3 inches (75 mm) inside of and parallel to the pavement
edge. Install these tie bars to within 1 1/2 inches (38 mm) of the subgrade or