SECTION 608: SIDEWALKS, DRIVE PADS, AND CONCRETE MEDIAN PAVEMENT
608.1 Description
This Work consists of construc ting Sidewalks, drive pads, detec table warning surfaces, and concrete Median pavement in accordance with these Standard Specifications and the Americans with Disabilities Act of 1990 (42 U.S.C. § 12101 et s eq.).
608.2 Materials
608.2.1 Concrete
The Contractor shall provide Cla ss A or Class F concrete in acc ordance with Section 510, “Portland Cement Concrete.”
608.2.2 Joint Fillers
The Contractor shall provide pref ormed expansion joint filler i n accordance with AASHTO M 33 or AASHTO M 153.
608.2.2 1 Silicone Joint Sealant and Backer Rod
The Contractor shall provide silicone joint sealant and backer rod (bondbreaker) from the Department’s Approved Products List and in accordance with Section 452, “Sealing and Resealing Concrete Pavement Joints.”
608.2.3 Bed Course Material
The Contractor shall provide bed course Material that consists of cinders, sand, gravel, crushed stone, or other granular aggregate, with 100% passing a 1/2 inch sieve and not more than 12% passing the No. 200 sieve, or Base Course as per Secti on 303, “Base Course.”
608.2.4 Detectable Warning Surfaces
608.2.4 1 General
The Contractor shall obtain a list of approved Suppliers from t he Department’s Approved Products List. The Contractor shall contact the Department’s Offic e of Affirmative Action to propose alternative Suppliers. S tamped or imprinted concrete s ystems will not be allowed.
608.2.4 2 Color Contrast
The Contractor shall provide a light colored Material on a dark surface or a dark colored Material on a light surface to c ontrast with adjacent walking s urfaces. The Contractor shall use a uniform color over the entire surfac e that is homogenous throughout the thickness of the Material, as approved by the Pr oject Manager. Should a concern arise over the co lor contrast, the Contractor will coordinate with the Environmental Program Manager (through the Project Manager) for color contrast guidance. The Contractor shall allow a minimum of 30 Days for coordinatio n with the Environmental Program Manager.
608.2.4 3 Contractor Submittals
Section 608: Sidewalks, Drive Pads, and Conc rete Median Pavement Page 663 The Contractor shall submit certification to the Project Manage r before proposed installation describing the following: 1. The detectable warning surfac e Material and name of approved Supplier; 2. All associated Materials us ed, including bonding Material an d color used for color contrast requirements; 3. Installation procedure as per manufacturer's recommendations ; 4. A detailed time element rega rding application to new concret e; 5. Submit a 12 inch × 12 inch sample of the detectable warning surface on concrete substrate showing the color c ontrast developed for the Project; 6. Certified test results indica ting compliance with manufactur er recommendations; and 7. Meet ADA Requirements.
608.3 Construction Requirements
608.3.1 Excavation and Backfill
The Contractor shall perform excavation or backfill to the requ ired depth of elevation and to a width that will allow the installation and bracing of the forms. The Contractor shall remove soft and yielding Material and replace with the specified bed c ourse Material. The Contractor shall shape and compact the foundat ion to a firm, even surface.
608.3.2 Bed Course Placement
The Contractor shall compact existing ground under bed course t o 95% of maximum density in accordance with Section 203.3.7, “Moisture and Densi ty Control.” The Contractor shall place at least four (4) inches of bed cour se Material. The Contractor shall compact bed course Material to a density of at least 90% of maximum density as determined by AASHTO T 180 (Modified Proctor), Method D (TTCP M odified). The Contractor shall compact bed course Material for drive pads to a density o f at least 96% of maximum density as determined by AASHTO T 180 (Modified Proctor), Metho d D (TTCP Modified). The Contractor shall perform compaction in accordance with Section 303.3.2, “Mixing and Placing.”
608.3.3 Forms
The Contractor shall use wood or metal forms that extend the fu ll depth of the concrete. The Contractor shall ensure forms are straight, free of warps, and strong enough to resist the concrete pressure without deforming. The Contractor shall brac e and stake forms so they remain in both horizontal and vertical alignment until their re moval. The Contractor shall treat the forms with form release oil to prevent damage to the concre te when removing the forms. The Contractor shall use flexible forms in curved sections so t hat the top surface of the forms produces a smooth, continuous arc.
608.3.4 Placing Concrete
The Contractor shall moisten the foundation immediately before placing the concrete. The Contractor shall remove excess water remaining on the found ation. The Contractor shall proportion, mix, and place the concrete in accordance with the requirements for the specified concrete. The Contractor shall use cast-in-place or slip forme d concrete. The Contractor shall ensure the surface of the patter ned concrete pavement matches t he finish grades. The Contractor shall consolidate the concrete placed in the forms b y vibration or other Acceptable Section 608: Sidewalks, Drive Pads, and Conc rete Median Pavement Page 664 methods.
608.3.5 Finishing
The Contractor shall finish the surface with a float. The Cont ractor shall not plaster or re- temper the surface with water. The Contractor shall give the t op surfaces of the slabs a transverse broomed finish after floating, unless otherwise spec ified in the Contract. The Contractor shall use an edging tool with a 1/2 inch radius on t he outside edges of the slab and joints.
608.3.5 1 Colored and Patterned Median Pavement Application
The Contractor shall apply the color to the mix at the concrete plant in accordance with the manufacturer’s recommendations. While concrete is still in the plastic state, the Contractor sh all apply the imprinting tools to make the desired patterned surface. The Contractor shall submit a sample panel at least two (2) ft × two (2) ft, showing color and texture, to the Project Manager for approval before startin g Work on the patterned concrete pavement. The Contractor shall use the approved sampl e panel as a standard for the installation of patterned concrete pavement.
608.3.5 2 Joints
The Contractor shall fill the ex pansion joints with pre-molded expansion joint filler. Also, the Contractor shall fill sealed expansion joints with a backer rod and silicone joint sealant at the specified intervals. The Contractor shall divide Sidewalks, drive pads, and concrete Median pavement into sections with contraction joints formed with a scoring tool to create rounded edges. The Contractor shall create contraction joints that are approximate ly 0.125 inch wide and extend into the concrete at least one-third (1/3) the depth of the Sid ewalk, drive pad, or concrete Median pavement. The Department will not require contraction j oints in patterned concrete Median pavement. The Contractor shall construct expansion joints that extend int o and through the Sidewalk around manholes, pipe inlets, utility poles, or other miscellan eous Structures. The Contractor shall install a pre-molded expansion joint filler to completely fill the joint. The Contractor shall install ex pansion joint filler 0.75 inch t hick between concrete Sidewalks and fixed Structures, such as buildings or Bridges. The Contractor shall ensure the expansion joint filler extends the full depth of the Sidewalk.
608.3.6 Curing
The Contractor shall cure concrete in accordance with Section 5 11.3.9, “Curing.”
608.3.7 Surface Tolerance
The Contractor shall not allow the surface of concrete Sidewalk s and Median pavement to deviate more than 1/4 inch (in any direction), if tested wit h a ten (10) ft straightedge. The Contractor shall correct deviations at no additional cost to th e Department. The Project Manager must approve the correction method. Section 608: Sidewalks, Drive Pads, and Conc rete Median Pavement Page 665 608.3.8 Detectable Warning Surface
608.3.8 1 Installation Requirements
The Contractor shall install detectable warning surfaces per th e manufacturer’s recommendations and provide manufacturer’s assistance for prope r installation when necessary. The Contractor shall provide the Project Manager the manufactur er’s certification stating that the Contractor is certified to install the detectable warn ing surfaces.
608.3.8 2 Tile Cutting
The Contractor shall provide detectable warning surfaces cut al ong the flat surface. Cutting along the raised (dome) surface is prohibited.
608.3.8 3 Cleanup
The Contractor shall leave a neat, clean Work area without any contamination. The Contractor shall remove and dispose all waste and excess Materi al in an environmentally Acceptable manner.
608.4 METHOD OF MEASUREMENT—Reserved
608.5 Basis of Payment
Pay Item Pay Unit Concrete Sidewalk ___inch Square Yard Drive Pad ___inch Square Yard Concrete Median Pavement ___inch Square Yard Concrete Median Pavement ___inch (Colored) Square Yard Concrete Median Pavement ___inch (Colored and Patterned) Square Yard
608.5.1 Work Included in Payment
The following Work and items will be considered Incidental to t he main items: 1. Excavation, backfill, compaction, expansion joint, coloring, and other related items and appurtenances; 2. Bedding Material; 3. All labor, manufacturer field assistance, Materials, Equipme nt, submittals, repairs, and cleanup; and 4. Detectable warning surface. Section 609: Curb and Gutter Page 666