Ord 1984-071 - Laserfiche WebLink

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b). Concrete Structure. The slabs shall consist of a minimum of four (4) inches of concrete, reinforced with a 6" X 6" X 10 guage wire mesh placed two (2) inches above the prepared subbase or base material. The concrete mix will be designed with the intention of producing a minimum average flexural strength (modulus of rupture) of 650 pounds per swuare inch at the age of seven (7) days using a standard testing machine in which the load is applied at the center of the beam span. The course aggregate factor shall not exceed 0.85. Unless otherwise sho\VI1 on plans, the concrete shall contain not less than five (5) sacks of cement per cubic yard of concrete. The water-cement ratio (net gallons of water per sack of 04 pounds of cement) shall not exceed 6.25 gallons/sack. Concrete specimens shall be prepared, cured and tested as outlined in the Texas Highway Deparbnent Bulletin G-ll. The number of tests required shall be in accordance with the Guide Schedule of Minimum Sampling and Testing Requirements. c). Asphaltic Concrete. This item shall consist of a base course, a leveling-up course, a surface course or any combination of these courses as shown on the plans, each to be composed of a compacted mixture of mineral aggregate and asphaltic material. The pavement shall be constructed on the previously completed and approved subbase, base or existing pavement (asphaltic or portland cement) as herein specified and in accordance with the construction plans. The mineral aggregate shall be composed of a coarse aggregate and a fine aggregate bound together by asphalt cement or oil asphalt. Træ grade of asphaltic material shall by ~ D of either Hot Mix - Hot lay or Hot Mix - cold variety. The application for surface pavement shall be no less than one and one-half (l~) inches thick after proper compaction. The Contractor shall notify the Engineer of the source of his asphaltic material prior to the start of the project. Proper compaction shall be attained as directed by the Engineer through utilization of specified rollers and/or other approved rollers.