The purpose of these specifications is to aid the property owner,
or contractor acting for the property owner, in constructing new or
reconstructing existing curb and sidewalk.
All materials shall conform to PennDOT Construction Specifications,
Publication 408, current edition. The use of calcium chloride will
not be permitted in concrete used in repair or construction. No material
such as asphalt, macadam or blacktop shall be substituted for these
specifications. Submit a copy of concrete batch slips to the Borough
upon request.
Concrete Requirements
|
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Item
|
Minimum
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Maximum
|
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Compressive strength (28 days) (psi)
|
4,000
|
---
|
Air entrainment
|
3 1/2%
|
7 1/2%
|
Slump (regular forming) (inches)
|
1
|
4
|
Slump (slip forming) (inches)
|
---
|
1 1/2*
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Temperature
|
60º F.
|
100° F.
|
* NOTE: High early strength (HES) concrete may be used for construction
of driveway depressions and when slip forming, as applicable.
|
Forms shall be of wood or metal, straight, free from warp and of sufficient strength to withstand the pressure of the concrete without springing. If of wood, they shall be two-inch planks, minimum, surfaced on the inside and the top. Forms shall be of a depth equal to the depth of the concrete. A front and back form shall be used for curb except where a good concrete sidewalk, which is not to be removed, abuts the new curb. Expansion material must be provided per §
A333-4H. Forms shall be accurately set to line and grade in such a manner as to prevent settlement or displacement. Forms shall be coated with a form release agent just prior to the placement of concrete. Use forms that will not discolor the concrete.
Concrete curbs and sidewalks shall be protected from adverse
weather conditions with plastic, burlap, canvas or similar materials.
Curing compound may be applied to retain moisture in concrete to allow
complete hydration of the cement. Two applications of curing compound
should be used, the second coat to be applied after the first coat
has dried. Use a nonyellowing type compound. Plastic, burlap, straw
or other types of moisture barrier must be used to maintain concrete
wetness during the curing process for at least seven days after pouring,
if curing compound is not used. No concrete shall be placed when the
temperature is below 32° F. To help prevent spalling and deterioration
of concrete surface from winter damage, a concrete hardener may be
applied 28 days after concrete is poured.
All curb and sidewalk areas in the Borough being newly constructed
or reconstructed shall provide curb cut ramps for the physically disabled
as required in accordance with current PennDOT specifications and
as shown on Roadway Construction Standards RC-67M, current revision.
Drawing Sheets Nos. 1 through 6 of 6, as attached, are to be
considered a part of these Curb and Sidewalk Construction Specifications.