DESCRIPTION: This item shall consist of the construction of four (4") inch deep and five (5”) inch deep concrete sidewalks on a bank run gravel base course as directed by the Engineer and in accordance with detail drawings included in these specifications. MATERIALS: All concrete used for walks shall be certified for 4,400 PSI test. The concrete shall contain not less than six (6) or more than seven (7) percent entrained air at the time the concrete is deposited in the forms. All materials for this work shall conform to the ASTM requirements of Article 15 (BOCA National Building Code, 1987) and requirements of Article M.03.01 and M.02.05 of Form 817, Standard Specifications for Roads, Bridges and Incidental Construction, State of Connecticut Department of Transportation. Bank Run Gravel for this work shall conform to specification M.02.03-Granular Base, Rolled Bank Gravel Surface and Traffic Bound Gravel Surface for use in the base course of the roadway section, and M.02.01-Granular Fill for use in backfilling trenches within the paved area. These specifications are set forth in the State of Connecticut “Standard Specifications for Roads, Bridges and Incidental Construction, Form 817, 2004”. Preformed Expansion Joint 1/2” Thick Premolded Bituminous Expansion Joint Material Steel Dowels: #5 epoxy painted steel reinforcement bars, 18” long. Dowel Sleeve: Speed Dowel 9” Sleeve PSD09/#5TX or equal. CONSTRUCTION METHOD: Whenever concrete walks are to be built, the area shall be excavated to the minimum depth of twelve (12) inches below the finished walk grade. All additional soft or unsuitable material shall be removed and replaced with acceptable fill material, suitable for compaction. All excavation shall be made to allow for area of the walk itself and six (6) inches outside the edges of the walk. The excavated area shall then be backfilled to a minimum depth of eight (8) inches of bank run gravel, or equal. The gravel shall then be thoroughly compacted to an even surface at least four (4) inches below the finished grade of the walk. Concrete is then placed within the remaining four inches (4”) or five inches (5”) to reach the finish elevation of the walk. The Engineer, or any of his agents, is authorized to make any tests of materials, or instruct the contractor to furnish tests of materials at his expense, as he may deem necessary. The width of all sidewalks must be minimum of four feet (4’) or as directed by the Engineer, or his representative. The location of the sidewalk shall normally be one foot (1’) outside the property line or one foot (1’) inside the street line and may be changed under direction from the Engineer or his representative. Upon request, the Public Works Department shall furnish sidewalk grades and lines. Premolded expansion joints, shall be placed a maximum of twenty feet (20’) on the sidewalk run, on both sides of every driveway, along edges where meeting curbs, adjacent to buildings and along any non-yielding surface adjacent to the walk. No concrete shall be poured when the air temperature is below forty (40) degrees Fahrenheit, unless suitable measures are taken for protection, and are approved by the Engineer. Additives may be used in the concrete, as specified in Conn. DOT, Form 817, Section M.03, when the temperature of the air is below forty (40) degrees Fahrenheit, only with approval of the Engineer. Under no circumstances shall concrete be placed on a frozen subgrade. The contractor shall protect the concrete during construction from damage from any or all causes. Concrete shall be protected from the direct rays of the sun, and exposed surfaces shall be kept moist until opened for use. The sidewalk shall be protected a minimum of five (5) days. With each delivery of concrete, the contractor shall furnish a ticket indicating the proportionment of the batch and stamped by an approved time clock indicating the time the batch is placed in the truck mixer. This ticket shall be presented to the Engineer's agent upon demand before discharging of the concrete will be permitted.
