All work and materials shall be in accordance with the Pennsylvania
Department of Transportation Publication 408, except as herein provided
or as approved by the Borough Engineer.
Concrete shall conform to Class A cement concrete for cement
concrete curb. Type A concrete shall have a minimum compressive strength
of 3,300 psi after 28 days. For slip-forming, the concrete shall be
designed with a slump of up to 1 1/2 inches.
The concrete shall be placed in the forms in horizontal layers
not to exceed five inches and spaded sufficiently to eliminate all
voids. An approved vibrator may be used when permitted by the Borough
Engineer. Where indicated or directed, downspout opening shall be
made through the curb as shown on accompanying details. The top surface
of the curb shall be finished true to line and grade in a smooth,
neat and even manner by means of wood floats, and the edges of the
face and back shall be rounded to a radius of not more than 3/4 inch
and 1/4 inch, respectively, while the concrete is still plastic.
The forms shall not be removed within 12 hours after the concrete
has been placed. No rubbing to correct irregularities will be permitted
until the full curing period has elapsed. Any irregular surface or
plastering will not be permitted, and all rejected curb shall be promptly
removed and replaced at no expense to the Borough.
Curb returns for streets shall be constructed as shown on the
accompanying detail for typical curb ending or to meet existing field
conditions.
Depressed curbs for handicapped/pedestrian ramps shall be installed
at the locations directed by the Borough.
Engineering specifications for cement concrete curbs are illustrated
on a detail sheet prepared by the Borough Engineer, which is hereby
declared to be part of this article, and the notations, references
and other data shown thereon are as much a part of this article as
if the same were fully set forth herein.