CATEGORY 600 SHOULDERS SECTION 602 — CURB, COMBINATION CURB AND GUTTER, AND MONOLITHIC MEDIAN
602.01 Description
Construct concrete curb, concrete combination curb and gutter, concrete curb openings, concrete monolithic median, and asphalt curb.
602.02 Materials
Refer to 701.02, 705.02, 708.02, and the following: Crusher Run Aggregate CR-6 901.01 Aggregate 901.01, Size No. 57 Curing Materials 902.07 Form Release Compound 902.08 Portland Cement Concrete 902.10, Mix No. 13 Asphalt Mix Section 904 Tack Coat 904.03 Reinforcement Steel 908.01 Joint Sealer 911.01 Preformed Joint Filler 911.02 Borrow Excavation 916.01 Common Borrow 916.01 Topsoil 920.01.01, 920.01.02 Subsoil 920.01.03, 920.01.04
602.03 Construction
602.03.01 Concrete Curb, Combination Curb and Gutter, and Monolithic Median.
a.Excavation. Excavate to the specified depth and to the width required to install and brace the forms. Compact the subgrade to 92 percent density according to T 180, Method C, and trim to the proper shape and required grade. Remove all soft and unsuitable material and replace with approved material. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
b.Forms.
1.Fixed Form Method. Ensure that all forms are properly designed and acceptable. Use full depth steel forms that are at least 10 ft in length. When installing forms where the radius of the curb face is less than 200 ft, use flexible or curved steel or wooden forms that are no more than 6 ft in length. Securely fasten and brace forms to prevent buckling, warping, or any other movement during the placing of concrete. Place the forms to a tolerance in grade and alignment of 1/4 in. in 10 ft. Thoroughly clean and coat the forms with a form release compound each time they are used.
2.Slip-Form Method. Refer to 603.03.01(b)(2).
c.Concreting. Mix according to 915.03.04. Volumetric batching and continuous mixing will be permitted. Before placing concrete, moisten the subgrade with as much water as it can absorb. Consolidate the concrete in the forms by spading or other approved method. Remove curb face forms as soon as the concrete will retain its shape. Keep other forms in place for at least 12 hours.
d.Depressed Curbs. Construct depressed curbs at entrances and sidewalk ramps.
e.Openings. Provide an outlet for rainspouts and other drainage by constructing insert openings within the curb. Construct curb openings as specified.
f.Finishing. Strike off the concrete to the specified cross section. Finish, float, and apply a broom finish. For matching adjacent concrete surfaces, other methods of finishing may be permitted. Do not use plastering. Use a 1 in. radius edging tool on the face edge of the curb. Finish all other exposed edges with a 1/4 in. edging tool. Limit any deviation from grade and alignment of the face and top surface of curbs and medians to no more than 1/4 in. in 10 ft. Do not add water to the concrete at any time during any phase of the finishing operations. Immediately after removal of the forms, repair all honeycombed and damaged areas. Ensure an ACI Concrete Flatwork Finisher or NRMCA Concrete Exterior Flatwork Finisher is present at all times during finishing operations.
g.Joints.
1.Fixed Form Method. Use 10 ft spacing between joints, except where a lesser spacing is necessary for closures and for matching expansion and contraction joints in contiguous concrete pavements. Do not use joint spacings less than 4 ft. Form the joints by using plate steel templates 1/8 in. to 3/16 in. thick that have a width and depth equal to the unit cross section. Do not use intermediate templates or sections of templates. Set the templates perpendicular to the line and grade of the unit. At stationary structures such as bridges and inlets, 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS construct an expansion joint using 1/2 in. preformed expansion joint filler. Construct expansion joints at points of curves, tangents, at locations coinciding with adjoining pavement joints, and as specified or as directed. Extend the expansion joint material to the full depth of the unit cross section. Apply sealer to the entire gutter portion and 1 in. up the face of all joints. In addition, seal the entire expansion joint of monolithic medians.
2.Slip-Form Method. Refer to 604.03.01(b), except use 602.03.01(g)(1) for joint spacing.
h.Cold Weather Construction and Curing. Refer to 520.03.02 and 520.03.12(a) White Pigmented, except the requirement for an approved spraying machine with drive wheels is waived. Apply by sprayers in two directions at 90 degrees to each other, at a rate recommended by the manufacturer, completely covering the surface of the concrete. Have standby equipment on site in the event of spraying equipment failure. Do not allow pedestrian and vehicular traffic during the curing period.
i.Backfill. Backfill as directed.
1.Non-Landscaped Areas. Backfill with approved materials as specified in Section 204 or Section 701 to the grade that is 4 in. below the final grade. Complete the backfill to the final grade with aggregate as specified or as directed.
2.Landscaped Areas. Backfill with topsoil up to 8 in. depth as specified in Section 701 and perform sodding or seeding as described in (3) below. For backfill more than 8 in. depth, the use of aggregate fill is prohibited. Install subsoil or approved common borrow as specified in Section 204 or Section 701 to the grade that is 4 in. below the final grade. Complete the adjustment with topsoil as specified in Section 701 and perform sodding or seeding as described in (3) below.
3.Sodding or Seeding. Immediately after placing topsoil, perform Turfgrass Sod Establishment as specified in Section 708. Alternatively, perform Turfgrass Establishment as specified in Section 705 and install Type A or Type E Soil Stabilization Matting as specified in Section 709.
602.03.02 Asphalt Curb. Unless otherwise approved, use a self-propelled machine to place
Asphalt curb. The machine shall form curbing that is uniform in texture, shape, and density, and to the specified template. Place the curb on a clean, dry, and stable base. Apply tack coat using asphalt of the type and amount as directed. When required, backfill the curb as specified in 602.03.01(i) after the asphalt curb has sufficiently hardened to prevent damage. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
602.04 Measurement and Payment
The payment will be full compensation for all concrete, asphalt mixes, forms, excavation, backfill, disposal of excess material, drainage openings, joint sealer, tack coat, and for all material, labor, equipment, tools, and incidentals necessary to complete the work. The removal and disposal of unsuitable material will be measured and paid for at the Contract unit price for Class-1A Excavation, which price includes the cost of using acceptable excavation as replacement material. When Borrow, Topsoil, or other selected backfill is specified as replacement material, payment will be made at the Contract unit price for the respective items. When existing curb, combination curb and gutter, or monolithic median are removed and replaced with new curb, combination curb and gutter, or monolithic median, the cost of the removal will be paid for as specified in 206.04.
602.04.01 Curb, Combination Curb and Gutter, and Monolithic Median will be measured and paid
for at the Contract unit price per linear foot. Asphalt Curbs, Concrete Curbs, and Concrete Combination Curb and Gutter will be measured along the front face of the curb. Monolithic Concrete Median will be measured along the center line of the finished top of median.
602.04.02 Concrete Curb Opening and Curb Opening for Concrete Combination Curb and Gutter
will be measured and paid for at the Contract unit price per each.
602.04.03 Turfgrass Establishment and Turfgrass Sod Establishment will be measured and paid
for separately. 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS 603 — SIDEWALKS CATEGORY 600 SHOULDERS SECTION 603 — SIDEWALKS
603.01 Description
Construct asphalt or concrete sidewalks and sidewalk ramps. Ensure that the sidewalks and sidewalk ramps are constructed in accordance with the most recent accessibility guidelines of the Americans with Disabilities Act (ADA).
603.02 Materials
Refer to 701.02, 705.02, 708.02, and the following: Curing Materials 902.07 Form Release Compound 902.08 Portland Cement Concrete 902.10, Mix No. 13 Asphalt Mix Section 904 Welded Wire Fabric 908.05 Joint Sealer 911.01 Preformed Joint Fillers 911.02 Borrow Excavation 916.01 Common Borrow 916.01 Topsoil 920.01.01, 920.01.02 Subsoil 920.01.03, 920.01.04
603.03 Construction
603.03.01 Concrete Sidewalks.
a.Excavation. Refer to 602.03.01(a).
b.Forms.
1.Fixed Form Method. Use full depth steel or wood forms. Use forms that are straight, free from warp, and of sufficient strength to resist the pressure of the concrete. Brace and stake the forms so that they remain in both horizontal and vertical alignment. Thoroughly clean and coat forms with form release 2025 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS
Source: Maryland Standard Specifications for Construction and Materials, 2025 Edition. Pages 759–762 of 1,113.