M 41-10 Page 8-77 Cement Concrete Sidewalks 8-148-14 Cement Concrete Sidewalks
8-14.1 Description
This Work consists of constructing cement concrete sidewalks and detectable warning surfaces in accordance with details shown in the Plans and these Specifications and in conformity to lines and grades shown in the Plans or as established by the Engineer.
8-14.2 Materials
Materials shall meet the requirements of the following sections: Cement 9-01 Aggregates 9-03 Premolded Joint Filler 9-04.1 Detectable Warning Surface 9-19 Concrete Curing Materials and Admixtures 9-23
8-14.3 Construction Requirements
The concrete in the sidewalks and curb ramps shall be air entrained concrete Class 3000 in accordance with the requirements of Section 6-02 .
8-14.3(1) Excavation
Excavation shall be made to the required depth and to a width that will permit the installation and bracing of the forms. The foundation shall be shaped and compacted to a firm even surface conforming to the section shown in the Plans. All soft and yielding material shall be removed and replaced with acceptable material.
8-14.3(2) Forms
Forms shall be of wood or metal and shall extend for the full depth of the concrete. All forms shall be straight, free from warp, and of sufficient strength to resist the pressure of the concrete without springing. Bracing and staking of forms shall be such that the forms remain in both horizontal and vertical alignment until their removal. After the forms have been set to line and grade, the foundation shall be brought to the grade required and thoroughly wetted approximately 12 hours before placing the concrete.
8-14.3(3) Placing and Finishing Concrete
The concrete shall be placed in the forms and struck off with an approved straightedge. As soon as the surface can be worked, it shall be troweled smooth with a steel trowel. After troweling and before installing the contraction joints or perimeter edging, the walking surfaces of the sidewalk and curb ramps shall be brushed with a stiff bristled broom. Brush strokes shall be perpendicular to the travel direction of the sidewalk. Expansion and contraction joints shall be constructed as shown in the Plans. When the sidewalk abuts a cement concrete curb or curb and gutter, the expansion joints in the sidewalk shall have the same spacing as the curb. The expansion joint shall be filled to full cross-section of the sidewalk with ⅜ inch premolded joint filler. Curb ramps shall be of the type specified in the Plans and shall include the cast-in-place detectable warning surface. Page 8-78 M 41-10
8-14 Cement Concrete Sidewalks8-14.3(4) Curing
Concrete sidewalks shall be cured for at least 72 hours. Curing shall be by means of moist burlap or quilted blankets or other approved methods. During the curing period, all traffic, both pedestrian and vehicular, shall be excluded. Vehicular traffic shall be excluded for such additional time as the Engineer may specify.
8-14.3(5) Detectable Warning Surface
8-14.3(5)A General
The detectable warning surface shall be located as shown in the Plans. The detectable warning surface shall have the truncated dome shape shown in the Plans.
8-14.3(5)B Cast-in-Place Detectable Warning Surfaces
Placement of the cast-in-place detectable warning surfaces shall be in accordance with the manufacturer’s recommendation for placement in fresh concrete, before the concrete has reached initial set, or on a hardened cement concrete surface or asphalt pavement surface. Vertical edges of the detectable warning surface shall be flush with the adjoining surface to the extent possible (not more than ¼ inch above the surface of the pavement) after installation. Embossing or stamping the wet concrete to achieve the truncated dome pattern or using a mold into which a catalyst-hardened material is applied shall not be allowed.
8-14.3(5)C Surface Applied Detectable Warning Surfaces
When surface applied detectable warning surfaces are applied, placement shall be in accordance with the manufacturer’s recommendation; however glued or stick down applications are prohibited for permanent installations. They shall be weather resistant and durable to normal pedestrian wear and maintenance activities, and show no appreciable fading, lifting, or shrinkage. The units shall be capable of molding or fitting itself to the contours, breaks, and faults of HMA or PCC surfaces, and show no significant tearing, rollback, lifting, or other signs of poor adhesion. Permanent installations of surface applied detectable warning surfaces shall be secured with mechanical fasteners.
8-14.4 Measurement
Cement concrete sidewalks will be measured by the square yard of finished surface and will not include the surface area of the curb ramps. Cement concrete curb ramp type ______ will be measured per each for the complete curb ramp type installed and includes construction of cast-in-place detectable warning surfaces. Detectable warning surfaces will be measured by the square foot of surface applied detectable warning surfaces constructed as shown in the Plans. M 41-10 Page 8-79 Cement Concrete Sidewalks 8-148-14.5 Payment Payment will be made for the following Bid items when included in the Proposal: “Cement Conc. Sidewalk”, per square yard. “Cement Conc. Sidewalk with Raised Edge”, per square yard. “Monolithic Cement Conc. Curb and Sidewalk”, per square yard. “Cement Conc. Curb Ramp Type ___”, per each The unit Contract price per each for “Cement Conc. Curb Ramp Type____” shall be full pay for construction of the curb ramp as specified, including the cast-in-place detectable warning surfaces. Payment for excavation of material not related to the construction of the sidewalk but necessary before the sidewalk can be placed, when and if shown in the Plans, will be made in accordance with the provisions of Section 2-03 . Otherwise, the Contractor shall make all excavations including haul and disposal, regardless of the depth required for constructing the sidewalk and curb ramps to the lines and grades shown and shall include all costs thereof in the unit Contract price per square yard for “Cement Conc. Sidewalk”, “Cement Conc. Sidewalk with Raised Edge”, “Monolithic Cement Conc. Curb and Sidewalk”, or the unit contract price per each for “Cement Conc. Curb Ramp Type ___”. “Detectable Warning Surface”, per square foot. The unit Contract price per square foot of “Detectable Warning Surface”, shall be full pay for surface applied detectable warning surfaces.