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Borough of Paxtang, PA
Dauphin County
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Table of Contents
Table of Contents
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.
A. 
Cement concrete curb shall be 18 inches in depth, with 10 inches below street grade, and as shown on the accompanying details.
B. 
Replacement cement concrete curb shall be constructed to the size and shape of the adjoining cement concrete curb. The exception being the height of the curb above the gutter line shall be a minimum of six inches and a maximum of nine inches.
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.
A. 
Forms for the curb shall be of metal, except wood forms may be used on sharp curves and short tangent sections when approved by the Borough Engineer. Forms shall be straight, free from warp, and of sufficient strength when staked to resist the pressure of the concrete without springing. At least three stakes shall be provided for each 10 feet of form. Metal forms shall be of approved section and shall have a flat surface on top and wood forms shall be nominal two-inch surfaced planks. These forms shall be of a depth equal to the depth of the curb, designed to permit secure fastening of the face and back forms at the tops. These fastenings shall be constructed in a manner that will not obstruct satisfactory finishing and edging of the top of the curb but will permit removal of the inside or face forms. The outside of back forms shall be straight from top to bottom. The inside of the face forms shall have a batter from the top of the curb to the finished surface line of the pavement, as shown on accompanying details, and shall be straight from this line to the bottom.
B. 
All forms and templates shall be thoroughly cleaned and treated with an approved material, as required, to prevent the concrete from adhering thereto. Oil, bituminous paper or other material which will adhere to or discolor the concrete shall not be used. Forms and templates which are worn, bent, warped or broken shall not be used. The forms shall be accurately set to line and grade in a manner to prevent settlement or displacement.
A. 
Materials requiring excavation such as old sidewalk, curbing, excess earth, tree roots, paving and other materials that cannot be used shall become the property of the contractor and disposed of by the contractor at no additional cost to the owner.
B. 
The existing cartway paving and cement concrete shall be saw cut as required and the excavation made to the required depth. The material upon which the curb is to be constructed shall be compacted to a firm, even surface.
C. 
In the event that overexcavation of the trench is necessary, the trench shall be backfilled to the required grade with 2B stone and thoroughly compacted to a firm, even surface at the contractor's expense.
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.
A. 
Plain cement concrete may be placed with a self-propelling machine consisting of a hopper, power-drive screw or screws, and a metering device.
B. 
Concrete shall be uniformly fed to the machine and, after extrusion, the concrete shall maintain the shape of the section without slumping.
C. 
The finished curb shall have a surface free from voids and honeycomb. Any additional surface finishing required shall be performed immediately after extrusion.
A. 
Contraction joints shall be spaced in uniform lengths or sections of 15 1/2 feet maximum, except where shorter sections are necessary for closures or curbs, but no section shall be less than four feet.
B. 
Contraction joints may be either hand-formed or saw-jointed. They shall be three-sixteenth-inch wide and two inches deep. Sawing of joints shall be done as soon as practicable after the concrete has set sufficiently to preclude raveling during the sawing and before any shrinkage cracking occurs in the concrete. The saw-cut depth may be decreased at the edge adjacent to the pavement to obtain a maximum depth that will avoid damage to the pavement. Contraction joints shall have tooled edges.
C. 
The three-fourths-inch premolded expansion joint material shall be cut to conform to the cross-sectional area and be placed at structures and at the end of a day's work.
D. 
Existing abutting concrete structures shall also have the three-fourths-inch premolded expansion joint material installed between the new and existing concrete.
A. 
The height of the curb may be lowered 6 1/2 inches at all places where driveways enter the street and at such other places as directed by the Borough Engineer.
B. 
In no case shall a depressed curb section extend beyond a property line. Where a driveway is adjacent to a property line the depressed section of curb must terminate inside of the property line.
C. 
Construction of depressed curb sections in excess of 20 feet in length shall not be permitted unless specifically approved by the Borough.
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.
A. 
The newly poured curb shall be cured and protected. In cool weather, temperatures below 35° F., curb shall be cured as directed by the Borough Engineer.
B. 
In warm weather, the curb shall be kept moist for a period of not less than three days, or longer if directed, and shall be protected from the elements by a burlap covering which is not less than seven ounces per square yard in weight or polyethylene sheeting with a total nominal thickness of the two layers not less than four mils, in a manner satisfactory to the Borough Engineer.
A. 
As soon as possible after the removal of forms, the spaces in front and back of the curb shall be backfilled with suitable materials in layers of not more than four inches in depth, which shall be thoroughly compacted mechanically to the required elevation and cross section. The layers shall be placed by alternating between the front and back of the curb.
B. 
Paving restoration shall be done in accordance with the accompanying details.
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.