SECTION 608 - CONCRETE SIDEWALKS
608.01 Description. This work consists of constructing concrete sidewalks on a prepared
subgrade in accordance with the plans and specifications. This work may also include the placement of detectable warning panels / trun cated domes in concrete sidewalk as shown on the plans or as directed by the Engineer. Lines and grades shall be as shown on the plans or established. "Subgrade" in this section shall mean the prepared foundation on which the sidewalk is constructed.
608.02 Materials. All material furnished for use shall comply with appropriate
requirements of the 700 series of these specifications, and the following: Concrete shall be Class B meeting the requirements of Section 804 or Class P or PA meeting the requirements of Section 501. Reinforcing steel shall meet the applicable requirements of Sections 602 and 711 and plan details. Detectable warning panels shall meet the requirements of plans, specifications, and the requirements of the Americans with Disabilities Act (ADA). The panels shall be precast, modular, or prefabricated.
608.03 Construction Requirements.
608.03.1 Equipment. The Contractor may use forms or, if requested in writing and
approved by the Engineer, an approved automatic extrusion type paving machine. Forms shall be wood or metal. If wood, they shall be dressed on all sides, and be free of bulges, warps, and loose knots. If metal, they shall be of approved section and have a flat surface on top. The depth of the forms shall be equal to the depth of the sidewalk. Adequate means shall be provided for securely fastening the ends of forms together. Prior to use, an automatic extrusion mach ine must be demonstrated to produce a consolidated concrete section conforming to the dimensions, cross section, line, and grades shown on the plans or established.
608.03.2 Excavation and In-Grade Preparation . Excavation shall be made to the
required depth and to a width that will permit the installation and bracing of forms. The foundation shall be shaped and compacted at the proper moisture content to a firm, even surface conforming to the lines, grades, and sec tions shown on the plans or established. All soft, spongy, or other unsuitable materials encountered shall be removed and replaced with acceptable material.
608.03.3 Setting Forms. Forms shall be set to the required line and grade and rigidly
held in place by stakes or braces. Ends of ad joining form sections shall be flush. Forms and division plates shall be cleaned and oiled before placing concrete against them.
608.03.4 Handling, Measuring, Proportioning, and Mixing Materials. The method of
handling, measuring, proportioning, and mixing concrete materials shall conform to Section 501 or Section 804. Where reinforcement is required, it shall be placed in accordance with Section 602.
608.03.5 Placing Concrete. A template resting upon the side forms and having its lower
edge at the elevation of the subgrade shall be drawn along the forms to shape and grade the subgrade before concrete is deposited. The subgrade shall be moist and free of debris and foreign material before concrete is deposited upon it. The concrete mixture shall be placed on the prepared subgrade to the depth required to complete the sidewalk in one course. It shall then be vibrated and/or tamped and struck off with an approved straightedge resting upon the side forms and drawn forward with a sawing motion. The surface shall be given a Class 6 float finish as set out in Section 804. The edges of sidewalk shall be rounded with an edging tool having a radius of 1/2 inch. Expansion joints shall be edged with an edger having a radius of 1/4 inch.
608.03.6 Joints. Expansion joints shall be of the dimensions specified and shall be filled
with the type of premolded expansion joint filler specified. Sidewalks shall be divided into sections by dummy joints formed by a join ting tool or other acceptable means. These dummy joints shall extend into the concrete for at least one inch and shall be approximately 1/8 inch wide. Joints shall match as nearly as possible adjacent joints in curb or pavements. Dummy joints may be sawed in lieu of forming with a jointing tool. Construction joints shall be formed around all appurtenances such as manholes, utility poles, etc. extending into and through the sidewalk. Premolded expansion joint filler 1/4 inch thick shall be installed in these joints. Expansion joint filler of the thickness indicated shall be installed between concrete sidewalks and fixed structure such as a building or bridge. This expansion joint material shall extend for the full depth of the walk.
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