632.01 Description. This item shall consist of the construction
of concrete islands according to these specificatio ns and in conformity with the locations, lines, and grades sh own on the plans or as directed.
632.02 Materials. The concrete used shall comply with Section
802 for Class A or S Concrete or Section 501 for pa ving concrete. 517 The maximum allowable slump shall be 4 inches (100 mm). The maximum water/cement ratio shall not be exceeded. The Department will perform all acceptance sampling and testing at the frequencies shown for Contractor acceptance testing in Subsection 802.06.
632.03 Construction Requirements. Unless the island is to be
constructed on an existing base or pavement, the su bgrade shall be shaped and compacted to the required grade and sect ion. All soft and yielding areas shall be removed and replaced wi th suitable material and compacted. Any portion of the subgrad e that is not accessible to normal compaction equipment shall be thoroughly compacted with manually operated mechanical tampers . Before depositing the concrete, the subgrade shall be clea red of all foreign materials that may have fallen on it and shall be i n a moist condition. When the island is being constructed on an existing base, the base shall be shaped and compacted as necessary to provi de a firm foundation true to the required grade and section. The base shall be in a moist condition and free of loose material whe n depositing concrete. When the island is to be constructed on an existing asphalt or concrete pavement, the pavement shall be cleaned of all loose material and moistened immediately before placing c oncrete. Any pot holes or other defects shall be repaired so as to provide a firm foundation for the island. At the Contractor's opt ion and expense, pot holes and other defects may be cleaned of loose material and filled with concrete at the same time as the island concrete is placed. After the concrete has been deposited and spread, i t shall be thoroughly consolidated and finished to a uniform l ine and grade free of humps and depressions. A space not less than ½" (12 mm) wide shall be left between the island and adjacent structures, except that no spac e shall be left between the sides of the island and adjacent curbs. The space shall be filled with approved joint filler complying with AASHTO M 213. When completed, the concrete shall be cured as spec ified in Section 501.
632.04 Method of Measurement. Concrete Island will be
measured by the square yard (square meter). 518 632.05 Basis of Payment. Work completed and accepted and measured as provided above will be paid for at the contract unit price bid per square yard (square meter) for Concre te Island, which price shall be full compensation for excavating and preparing the subgrade, existing base, and/or pavement; for furni shing, transporting, and placing all materials; for the pr eparation and processing of all materials; for all mixing, spread ing, vibrating, finishing, and curing; and for all labor, equipment , tools, and incidentals necessary to complete the work. Work i nvolved in preparing the subgrade, existing base, and/or exist ing pavement will not be paid for separately, but full compensation t herefor will be considered included in the contract unit price bid for Concrete Island. Payment will be made under: Pay Item Pay Unit Concrete Island Square Yard (Square Meter)