SECTION 607 – CURB
607.01 Description
This Section describes the requirements for constructing concrete curb, granite curb, and HMA curb, and for resetting granite curb.
607.02 Materials
607.02.01 Materials
Provide materials as specified: Hot Mix Asphalt (9.5M64) ................................ ................................ ................................ ........................... 902.02 Concrete ................................ ................................ ................................ ................................ ...................... 903.03 Mortar................................ ................................ ................................ ................................ ...................... 903.08.01 Curing Materials ................................ ................................ ................................ ................................ .......... 903.10 Reinforcement Steel ................................ ................................ ................................ ................................ ..... 905.01 Granite Curb ................................ ................................ ................................ ................................ ................ 910.04 Flexible Delineators ................................ ................................ ................................ ................................ ..... 911.03 Preformed Joint Filler ................................ ................................ ................................ ................................ ... 914.01 Joint Sealer, Hot-Poured ................................ ................................ ................................ ............................... 914.02 For concrete curb at driveways , the Contractor may use Class E concrete, as specified in 903.04, in order to open the driveway to traffic in 3 days.
607.02.02 Equipment
Provide equipment as specified: HMA Curb Machine................................ ................................ ................................ ................................ .... 1003.02 Bituminous Material Distributor ................................ ................................ ................................ .................. 1003.07 Sealer Application System ................................ ................................ ................................ ........................... 1003.08 Vibrator ................................ ................................ ................................ ................................ ...................... 1005.04 Straightedge ................................ ................................ ................................ ................................ ................ 1008.02 HMA Plant................................ ................................ ................................ ................................ .................. 1009.01 HMA Trucks ................................ ................................ ................................ ................................ ............... 1009.02 Concrete Batching Plant ................................ ................................ ................................ .............................. 1010.01 Concrete Trucks ................................ ................................ ................................ ................................ .......... 1010.02
607.03 Construction
607.03.01 Concrete Barrier Curb
A.Placing Footing. Excavate as specified in 202.03.03. Shape and compact the underlying material to produce a firm, even surface. Obtain RE approval before finishing excavation. If the RE determines that the bottom of the excavation is unstable, undercut, backfill, and compact as directed by the RE. Place footing concrete according to the limitations specified in 504.03.02.C. Consolidate the concrete by hand spading or using internal mechanical vibrators. Insert the reinforcement steel into the concrete before initial set. Ensure that it remains perpendicular to the footing until the barrier curb is constructed. Protect concrete as specified in 504.03.02.I.
B.Constructing Forms. Each time before using, ensure that the forms are thoroughly cleaned and treated with a material that will prevent adherence of the concrete to the forms without discoloring the concrete. Construct concrete barrier curb in sections that correspond to the transverse joints in the existing or p roposed pavement and at most 20 feet in length. Reduce this length where necessary for closures, but do not construct closure sections that are less than 6 feet. Where changes in the size or shape are necessary for variable height barrier curb, ensure that the transition between the sections is gradual.
C.Installing Joints. Place 1/2 inch preformed joint filler at the transverse joints and ensure that filler is flush with the top and face of the curb. Install 1/2 inch preformed joint filler between the curb and concrete pavement, and seal the joint with hot-poured joint sealer.
D.Placing Co ncrete. Obtain RE approval of forms and joint placement before placing concrete. Place concrete according to the limitations specified in 504.03.02.C. To place concrete between November 1 to March 15, submit to RE for approval a plan detailing the method of protecting the concrete from salt for at least 30 days after placing. Do not begin placing concrete until this plan is approved. Place concrete across the formed area to minimize rehandling. Continuously place concrete between transverse joints without the use of intermediate bulkheads. To prevent bowing or misalignment of the transverse joints, place concrete simultaneously on both sides of transverse joints without disturbing the joints. Consolidate the concrete using internal mechanical vibrators. When required, supplement vibrating by hand spading to ensure proper and adequate consolidation. Provide at least an additional standby vibrating unit for individual concrete placements in excess of 10 cubic yards. Use vibrators to work the concrete around the reinforcement steel and embedded fixtures and into corners and angles of the forms. Ensure proper vibration of the concrete to avoid honeycombing and voids. Do not use vibrators to move or spread concrete into position. Do not over vibrate concrete. Place reinforcement steel and sleeves for sign posts while placing concrete, and ensure that they remain in position until the concrete is set. If a section is not completed from transvers e joint to transverse joint, remove the incomplete section and replace. Terminate each day’s placement at a transverse joint. Protect concrete as specified in 504.03.02.I. Fill sleeves for sign or delineator posts installed in barrier curb with sand, and seal the sleeves with hot-poured joint sealer immediately after installation. Reseal the sleeves if and when posts are installed.
E.Finishing Concrete. Finish the top of the curb with a woo d float and round the top edges. Remove the forms as soon as the concrete holds its shape, and immediately finish joint edges using an edging tool with a radius of 1/4 inch. Remove lips of mortar and irregularities caused by form joints. Using mortar fr om the barrier concrete placement, patch holes, depressions, voids, and honeycombs to produce a smooth, dense, uniform surface of concrete. Finish the surface of the barrier curb with a steel float and texture with a broom. If a rigid type of construction is to be made against any exposed surface, leave the exposed surface smooth and uniform to allow free movement of the curb.
F.Protecting and Curing Concrete. Immediately after finishing the concrete, apply curing compound as specified in
504.03.02 F.1.
G.Installing Flexible Delineators. For delineators located on the right side when facing in the direction of traffic, ensure that the retroreflective sheeting is white. For delineators located on the left side when facing in the direction of traffic, ensure that the retroreflective sheeting is yellow. Attach flexible delineators, according to the manufacturer’s recommendations, 3 inches from the top of the barrier curb. Mount t he first flexible delineator at the beginning of the concrete barrier curb section. Mount subsequent delineators every 80 feet. Position each delineator so that the plane face of the center of the refl ective area is at an angle of 0 degrees with a line that is perpendicular to the direction of traffic. If the distance between the end of the concrete barrier curb and the adjacent delineator is greater than 40 feet, install a delineator on both sides of the barrier curb opening.
607.03.02 Concrete Vertical Curb and Concrete Sloping Curb
A.Underlayer Preparation. Excavate as specified in 202.03.03. Shape and compact the underlying material to produce a firm, even surface. Obtain RE approval before finishing excavation. If the RE determines that the bottom of the excavation is unstable, undercut, backfill, and compact as directed by the RE.
B.Constructing Forms. Construct forms as specified in 607.03.01.B.
C.Installing Joints. Install joints as specified in 607.03.01.C.
D.Placing Concrete . Place concrete for vertical curb and sloping curb as specified in 607.03.01.D, except that consolidation may be achieved by hand spading or internal mechanical vibrators.
E.Finishing Concrete. Finish the top and front face of the curb as specified in 607.03.01.E.
F.Protecting and Curing Concrete. Immediately after finishing the concrete, apply curing compound as specified in
504.03.02 F.1.
G.Backfilling Curb. Backfill and compact using the directed method, as specified in 203.03.02.B.3, against the curb.
607.03.03 Concrete Barrier Curb, Dowelled
A.Underlayer Preparation. Remove dirt, bituminous material, and other loose or adhering matter from the surface. Drill holes in the concrete that are between 1/4 inch and 3/4 inch in diameter bigger than the diameter of the reinforcement steel dowel. Set the reinforcement steel dowels in the hole and grout into place.
B.Constructing Forms. Construct forms as specified in 607.03.01.B.
C.Installing Joints. Locate transverse joints in dowelled curb directly over the transverse joints in the concrete pavement, and over transverse pavement cracks wider than 1/4 inch. Locate additional joints as needed to divide the curb into approximately equal lengths of at most 20 feet. Place 1/2 inch preformed joint filler at transverse joint locations and ensure that it is flush with the top and faces of the curb. Place 1/2 inch preformed joint filler between the curb and concrete pavement, and seal the joint with hot-poured joint sealer.
D.Placing Concrete. Place concrete for barrier curb as specified in 607.03.01.D.
E.Finishing Concrete. Finish concrete as specified in 607.03.01.E.
F.Protecting and Curing Concrete. Immediately after finishing the concrete, apply curing compound as specified in
504.03.02 F.1. Protect the concrete as specified in 504.03.02.I.
G.Installing Flexible Delineators. Install flexible delineators as specified in 607.03.01.G.
607.03.04 Concrete Vertical Curb and Concrete Sloping Curb, Dowelled
A.Underlayer Preparation. Prepare the underlying surface as specified in 607.03.03.A.
B.Constructing Forms. Construct forms as specified in 607.03.01.B.
C.Installing Joints. Install joints as specified in 607.03.01.C.
D.Placing Concrete. Place concrete for vertical and sloping curb as specified in 607.03.02.D.
E.Finishing Concrete. Finish the top and front face of the curb as specified in 607.03.01.E.
F.Protecting and Curing Concrete. Immediately after finishing the concrete, apply curing compound as specified in
504.03.02 F.1.
G.Backfilling Curb. Backfill and compact using the directed method, as specified in 203.03.02.B.3, against the curb.
607.03.05 Granite Curb
Excavate as specified in 202.03.03. Shape and compact the underlying material to produce a firm, even surface. Obtain RE approval before finishing excavation. If th e RE determines that the bottom of the excavation is unstable, undercut, backfill, and compact as directed by the RE. Place footing concrete according to the limitations specified in 504.03.02.C. Consolidate the concrete by hand spading or using internal mechanical vibrators. Set granite curb in concrete ensuring that the top surface is at the required grade. Ensure that joints are at most 1/ 4 inch wide for dressed and 3/8 inch wide for quarry-split curb. Point the joints using mortar. Place 1/2 inch preformed joint filler between the granite curb and concrete pavement. Seal with hot-poured joint sealer. Backfill and compact using the directed method, as specified in 203.03.02.B.3, against the curb.
607.03.06 Reset Granite Curb
Remove granite curb without damaging the existing granite curb sections. Remove the existing foundation and concrete adhering to the granite curb sections to be reset. Reuse concrete as specified in 202.03.03.C.1. Shape and compact the underlying material to produce a firm, even surface. Remove unstable material and replace it with suitable material. Once placed, compact the replacement underlying material. Place footing concrete according to the limitations specified in 504.03.02.C. Consolidate the concrete by hand spading or using internal mechanical vibrators. Reset granite curb. Ensure that joints are at most 1/4 inch wide for dressed and 3/8 inch wide for quarry-split curb. Point the joints using mortar. Place 1/2 inch preformed joint filler between the granite curb and adjacent concrete pavement. Seal with hot-poured joint sealer. Backfill and compact using the directed method, as specified in 203.03.02.B.3, against the curb.
607.03.07 Hot Mix Asphalt Curb
Clean the surface where the HMA curb will be placed. Construct HMA curb using an HMA curb machine. Where the HMA curb is to be placed on an existing surface that does not have a smooth grade, use a method that provides the required curb line and grade. The Contractor may use side forms. When short sections of HMA curb with short r adii are required, the Contractor may use another method as long as the resulting HMA curb conforms to the curb as produced by the automatic machine. Perform HMA curb construction in a continuous operation in one direction to eliminate curb joints. Howeve r, where conditions prevent a continuous operation, construct joints to ensure a continuous bond between the old and new sections of the HMA curb.
607.04 Measurement and Payment
The Department will measure and make payment for Items as follows: Item Pay Unit ___" X ___" CONCRETE BARRIER CURB LINEAR FOOT ___" X VARIABLE HEIGHT CONCRETE BARRIER CURB LINEAR FOOT ___" X ___" CONCRETE VERTICAL CURB LINEAR FOOT ___" X VARIABLE HEIGHT CONCRETE VERTICAL CURB LINEAR FOOT ___" X ___" CONCRETE SLOPING CURB LINEAR FOOT ___" X ___" CONCRETE BARRIER CURB, DOWELLED LINEAR FOOT ___" X VARIABLE HEIGHT CONCRETE BARRIER CURB, DOWELLED LINEAR FOOT ___" X___" CONCRETE VERTICAL CURB, DOWELLED LINEAR FOOT ___" X VARIABLE HEIGHT CONCRETE VERTICAL CURB, DOWELLED LINEAR FOOT ___" X ___" CONCRETE SLOPING CURB, DOWELLED LINEAR FOOT ___" X ___" F SHAPE CONCRETE BARRIER CURB LINEAR FOOT ___" X ___" F SHAPE CONCRETE BARRIER CURB, DOWELLED LINEAR FOOT ___" X VARIABLE HEIGHT F SHAPE CONCRETE BARRIER CURB, DOWELLED LINEAR FOOT ___" X ___" HEIGHT F SHAPE CONCRETE BARRIER CURB, DOWELLED LINEAR FOOT VARIABLE WIDTH X VARIABLE HEIGHT F SHAPE CONCRETE BARRIER CURB LINEAR FOOT VARIABLE WIDTH X VARIABLE HEIGHT CONCRETE BARRIER CURB LINEAR FOOT GRANITE CURB LINEAR FOOT RESET GRANITE CURB LINEAR FOOT ___" X ___" HOT MIX ASPHALT CURB LINEAR FOOT The Department will measure curb along the face at the gutter line.
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 331–334 of 651. View official source ↗