00480.00 400
Description
00480.00Scope - This Work consists of constructing mechanically extruded curbs using either
Commercial Grade Concrete (CGC) or asphalt concrete material .
Construct the curbs at the locations and to the lines, grades and dimensions shown, or as directed.
Materials
00480.10Materials - Furnish Materials meeting the following requirements:
Emulsified Asphalt ................................................................................. 00730.11 Epoxy Bonding Agent ............................................................................ 02070.10 Preformed Expansion Joint Filler .......................................................... 02440.10
00480.11Asphalt Concrete - Furnish commercial asphalt concrete Pavement meeting the
requirements of Section 00740 . The mixture may be varied when conditions require it, if approved by the Engineer.
Construction
00480.40Preparation of Base - Clean Pavements upon which drainage curbs are to be constructed
so that they are free of dirt, dust, oil, grease or other extraneous matter.
00480.41Bonding Material Application:
the QPL or conforming to 00480.10. Apply according to the manufacturer's recommendations and at a rate that provides a thorough coating to the surface with all voids and depressions filled. Place the new curb on the epoxy bonding agent within 15 minutes after spreading, or before it loses its tackiness, whichever is sooner.
• An epoxy bonding agent meeting the requirements of 00480.10 or from the QPL, applied in the manner specified in 00480.41(a), or • An Emulsified Asphalt of the type designated by the Engineer and conforming to 00480.10. Apply Emulsified Asphalt at a rate of 0.05 to 0.10 gallons per square yard of curb. Place the new curb on the Emulsified Asphalt after the asphalt separates from the water (breaks), but before it loses its tackiness.
00480.42Commercial Grade Concrete Curbs:
operate the machine under sufficient uniform restraint to forward motion to produce a well compacted mass of concrete. Perform finishing Work as required to present a smooth, dens e surface.
Remove and replace honeycombed sections. Repair of honeycombed and other defective sections by plastering is not allowed.
00480.90 401 (b) Transverse Expansion Joints - Space expansion joints as shown. The width of the joint and thickness of the filler shall not be less than 1/2 inch. Construct each expansion joint at right angles to the curb alignment, normal to the surface of the curb and provide complete separation of new concrete.
Firmly support the adjacent portions of the curb with close fitting shields if expansion joints are sawed before the concrete has hardened. Mortar the joint filler in place if sawing is performed after the concrete has hardened.
grooving, by inserting and removing plates or other devices, by inserting and leaving in place preformed expansion joint fillers or by other approved means.
Make joints no wider than 1/4 inch, and deep enough so that at least o ne-third of the cross -sectional area of the curb is severed. Tool the edges of joints. Clean unfilled grooves and fill with joint filler flush with the surface of the concrete.
fresh concrete, according to 00440.40(e).
00480.43Asphalt Concrete Curbs - Construct asphalt concrete curbs by the mechanical extrusion
method. Produce a well compacted mass of asphalt concrete with a uniform texture finish.
00480.44Line and Grade - Place a 12-foot straightedge on the top or face of curb. The curb surface
shall not vary more than 1/4 inch from the edge of the straightedge, except at grade changes or curves.
Measurement
00480.80Measurement - The quanti ties of drainage curbs will be measured on the length basis, for
each continuous run measured along the line and grade of the curb.
Payment
00480.90Payment - The accepted quantities of drainage curbs will be paid for at the Contract unit
price, per foot, for the item "Drainage Curbs".
Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified.