SECTION 609 - CURB
609.01 Description Construct or reset curb, gutter, or combination curb and gutter,
paved ditch, and paved flume. The types of curb are designated as follows: Type 1 - Stone curbing of quarried granite stone Type 3 - Bituminous curbing Type 5 - Stone edging of quarried granite stone
609.02 Materials Except as provided below, the materials used shall meet the
requirements of the following Sections of Division 700 - Materials: J o i n t M o r t a r 705.02 Reinforcing Steel 709.01 C o n c r e t e C u r b 712.061 Stone Curbing and Edging 712.04 Epoxy Resin 712.35 Bituminous Curbing 712.36 Portland cement and Portland Pozzolan Cement 701.01 W a t e r 701.02 F i n e A g g r e g a t e f o r C o n c r e t e 703.01 6-38 C o a r s e A g g r e g a t e f o r C o n c r e t e 703.02 The Contractor shall submit a concrete mix design for the Portland Cement Concrete to the Resident, with a minimum designed compressive strength of 4000 psi Class A concrete. Circular curb, terminal sections and transition sections shall be in reasonably close conformity with the shape and dimensions shown on the plans and to the applicable material requirements herein for the type of curb specified. Dowels shall be reinforcing steel deformed bars.
609.03 Vertical Stone Curb, Terminal Section and Transition Se ctions and Portland
Cement Concrete Curb, Terminal Sections and Transition Sections
a.Installation The curb stone shall be set on a compacted fo undation so that the front top arris line conforms to the lines and grades required. The foundation shall be prepared in advance of setting the stone by grading the proper elevation and shaping to conform as closely as possible to the shape of the bottom of the stone. The required spacing between stones shall be assured by the use of an approved spacing device to provide an open joint between stones of at least ¼ inch and no greater than ⅝ inch.
b.Backfilling All remaining spaces under the curb shall be f illed with approved material and thoroughly hand tamped so the stones will have a firm uniform bearing on the foundation for the entire length and width. Any remaining excavated areas surrounding the curb shall be filled to the required grade with approved materials. This material shall be placed in layers not exceeding 8 inches in depth, loose measure and thoroughly tamped. When backfill material infiltrates through the joints between the stones, small amounts of joint mortar or other approved material shall be placed in the back portion of the joint to prevent such infiltrating.
c.Protection The curb shall be protected and kept in good c ondition. All exposed surfaces smeared or discolored shall be cleaned and restored to a satisfactory condition or the curb stone removed and replaced.
d.Curb Inlets Curb placed adjacent to curb inlets shall be installed with steel dowels cemented into each stone with epoxy grout as shown in the Standard Details. The epoxy grout shall be used in accordance with the manufactu rer's instructions. The grout shall be forced into the hole, after which the dowel shall be coated with grout for one-half its length and inserted into the grout filled hole. The hole shall be completely filled with grout around the dowel. All tools and containers must be clean before using. The Contractor may elect to substitute concrete to backfill Stone Curbing or Stone Edging at their option. If the concrete backfill option is elected, the following is added to Standard Specification 609 – Curb 6-39
609.04 Bituminous Curb
a.Preparation of Base Before placing the curb, the foundati on course shall be thoroughly cleaned of all foreign and objectionable material. String or chalk lines shall be positioned on the prepared base to provide guide lines. The foundation shall be uniformly painted with tack coat at a rate of 0.04 to 0.14 gal/yd 2.
b.Placing The curb shall be placed by an approved power ope rated extruding type machine using the shape mold called for. A tight bond shall be obtained between the base and the curb. The Resident may permit the placing of curbing by other than mechanical curb placing machines when short sections or sections with short radii are required. The resulting curbing shall conform in all respects to the curbing produced by the machine.
c.When required, the curb shall be painted and coated with glass beads in accordance with Section 627 - Pavement Marking. Curb designated to be painted shall not be sealed with bituminous sealing compound.
d.Acceptance Curb may be accepted or rejected based on appe arance concerning texture, alignment, or both. All damaged curb shall be removed and replaced at the Contractor's expense.
e.Polyester fibers shall be uniformly incorporated into the dry mix at a rate of 0.25 percent of the total batch weight. Certification shall be provided from the supplier with each shipment meeting the following requirements: Average Length 0.25 inches ± 0.005 Average Diameter 0.0008 inches ± 0.0001 Specific Gravity 1.32-1.40 Melting Temperature 480 °F Minimum
609.06 Stone Edging The curb shall be installed, backfilled a nd protected in
accordance with Section 609.03, except as follows:
a.Slope The edging shall be set on a slope as shown on the p lans or as directed.
b.Joints Joints shall be open and not greater than 1½ inch i n width.
609.07 Stone Bridge Curb
a.Installation Each stone and the bed upon which it is to b e placed shall be cleaned and thoroughly wetted with water before placing the mortar for bedding and setting the stone. The stone shall be set on a fresh bed of joint mortar and well bedded before the mortar has set so that the front top arris line conforms to the line and grade required. 6-40 Whenever temporary supporting wedges or other devices are used in setting the stones, they shall be removed before the mortar in the bed has become set, and the holes left by them shall be filled with mortar. Concrete behind the stones shall not be placed until the stones have been in place at least two days. Bedding and pointing mortar for joints shall be cured as required under Section 502 - Structural Concrete.
b.Joints Vertical joints sh all be ½ inch in width plus or minus ⅛ inch. Whenever possible, the face and top of the joint shall be pointed with joint mortar to a depth of 1½ inch, before the bedding mortar has set. Joints which cannot be so pointed, shall be prepared for pointing by raking them to a depth of 1½ inch before the mortar has set. Joints not pointed at the time the stone is laid shall be thoroughly wetted with clean water and filled with mortar. The mortar shall be well driven into the joint and finished with an approved pointing tool, flush with the pitch line of the stones.
609.08 Resetting Stone or Portland Cement Concrete Curb, Inclu ding Terminal
Sections and Transitions The curb shall be installed, backfilled and protected in accor dance with Section 609.03, except as follows:
a.Removal of Curbing The Contractor shall carefully remove and store curb specified on the plans or designated for resetting. Curb damaged or destroyed, because of the Contractor's operations or because of their failure to store and protect it in a manner that would prevent its loss or damage, shall be replaced with curbing of equal quality at the Contractor's expense.
b.Cutting and Fitting Cutting or fitting necessary in order to install the curbing at the locations directed shall be done by the Contractor.
609.09 Method of Measurement Curb, both new and reset, will be measured by the
linear foot along the front face of the curb at the elevation of the finished pavement, complete in place and accepted. Curb inlets at catch basins, including doweling, will not be measured for payment but shall be considered included in the cost of the catch basin. New transition sections and terminal curb will be measured by the unit. Reset transition sections and terminal curb will be included in the measurement for resetting curb.
609.10 Basis of Payment The accepted quantities of curbing will be paid for at the
contract unit price per linear foot for each kind and type of curbing as specified. Payment for terminal curb shall include only that portion of t he curbing modified for installation at ends of curb runs shown in the Standard Details. Curb adjacent to terminal ends shall be paid for at the contract unit price per linear foot for the type of curb installed. Vertical Curb Type 1 is required to have a radius of 60 feet o r less, will be paid for as Vertical Curb Type 1 - Circular. 6-41 Curb, Type 5 required to have a radius of 30 feet or less will be paid for as Curb Type 5 - Circular. There will be no separate payment for concrete fill, mortar, reinforcing steel, anchors, tack coat, drilling for and grouting anchors, pointing and bedding of curbing, and for cutting and fitting, but these will be considered included in the work of the related curb. Removal of existing curb and necessary excavation for installi ng new or reset curbing will not be paid for directly, but shall be considered to be included in the appropriate new or reset curb pay item. Base and Subbase material will be paid for under Section 304 - Aggregate Base and Subbase Course. Backing up bituminous curb is incidental to the curb items. Loam, as directed, will be paid under 615 – Loam. Payment will be made under: Pay Item P a y U n i t
609.11 Vertical Curb Type 1 L i n e a r F o o t
609.12 Vertical Curb Type 1 - Circular L i n e a r F o o t
609.13 Vertical Bridge Curb Type 1 L i n e a r F o o t
609.131 Vertical Bridge Curb Type 1A L i n e a r F o o t 609.132 Vertical Bridge Curb Type 1B L i n e a r F o o t 609.142 Vertical Bridge Curb Type 1B - Circular L i n e a r F o o t
609.15 Sloped Curb Type 1 L i n e a r F o o t
609.151 Sloped Curb Type 1 - Circular L i n e a r F o o t
609.23 Terminal Curb Type 1 E a c h
609.234 Terminal Curb Type 1 - 4 foot E a c h 609.237 Terminal Curb Type 1 - 7 foot E a c h 609.2371 Terminal Curb Type 1 - 7 foot – Circular E a c h 609.238 Terminal Curb Type 1 - 8 foot E a c h
609.26 Curb Transition Section B Type 1 E a c h
609.31 Curb Type 3 L i n e a r F o o t
609.34 Curb Type 5 L i n e a r F o o t
609.35 Curb-Type 5 - Circular L i n e a r F o o t
609.38 Reset Curb Type 1 L i n e a r F o o t
609.39 Reset Curb Type 2 L i n e a r F o o t
609.40 Reset Curb Type 5 L i n e a r F o o t
Referenced in this section
Sections that cite this one
Curb in other states
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Source: Standard Specifications — Highways and Bridges, 2020 Edition. Pages 507–511 of 817. View official source ↗