Laserfiche WebLink
<br />150-f <br /> <br />b). Concrete Structure. <br /> <br />I <br /> <br />The slabs shall consist of a minimum of four (4) inches of concrete, <br />reinforced with a 6" X 6" X 10 gauge wire mesh placed two (2) inches above the prepared <br />subbase or base material. The concrete mix will be designed with the intention of <br />producing a minimum average flexural strength (modulus of rupture) of 650 pounds <br />per square inch at the age of seven (7) days using a standard testing machine in <br />which the load is applied at the center of the beam span. The course aggregate factor <br />shall not exceed 0.85. Unless otherwise shown on plans, the concrete shall contain <br />not less than five (5) sacks of cement per cubic yard of concrete. The water-cement <br />ratio. (net gallons of water per sack of 94 pounds of cement) shall not exceed 6.25 <br />gallons/sack. Concrete specimens shall be prepared, cured and tested as outlined in <br />the Texas Highway Department Bulletin C-ll. The number of tests required shall be <br />in accordance with the Guide Schedule of Minimum Sampling and Testing Requirements. <br /> <br />c). Asphaltic Concrete. <br /> <br />This item shall consist of a base course, a leveling-up course, a surface <br />course or any combination of these courses as shown on the plans, each to be composed <br />of a compacted mixture of mineral aggregate and asphaltic material. The pavement <br />shall be constructed on the previously completed and approved subbase, base or existing <br />pavement (asphaltic or portland cement) as herein specified and in accordance with <br />the construction plans. <br /> <br />The mineral aggregate shall be composed of a coarse aggregate and a fine <br />aggregate bound together by asphalt cement or oil asphalt. The grade of asphaltic <br />material shall by Type D of either Hot Mix - Hot Lay or Hot Mix - Cold Lay variety. <br />The application for surface pavement shall be no less than one and one-half (1 1/2) <br />inches thick after proper compaction. The Contractor shall notify the Engineer of <br />the source of his asphaltic material prior to the start of the project. <br /> <br />Proper compaction shall be attained as directed by the Engineer through <br />utilization of specified rollers and/or other approved rollers. <br /> <br />I <br /> <br />I <br />