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§ 5-128 BUll.DINGS AND Bun..DING REGULATIONS § 5-135 (b) Concrete structure. The slabs consist of a minimum of four (4) inches of concrete, reinforced with a six-inch by six-inch by ten-gauge wire mesh placed two (2) inches above the prepared subbase or base material. The concrete mix wiIl be designed with the intention of producing a minimum average flexural strength (modulus of rupture) of six hundred flfty (650) pounds per square 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 shown 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 Department BuIletin G-ll. The number of tests required shaIl be in accordance with the guide schedule of minimum sampling and testing requirements. (c) Asphaltic concrete. This item shaH 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 com- pacted mixture of mineral aggregate and asphaltic material. The pavement shaIl be constructed on the previously completed and approved subbase, base or existing pavement (asphaltic or Port- land cement) as herein specified and in accordance with the con- struction plans. The mineral aggregate shaIl be composed of a course aggregate and a fine aggregate bound together by asphalt cement or oil asphalt. The grade of asphaltic material shaIl be Type D of either hot mix- hot lay or hot mix- cold variety. The application for surface pavement shaIl be no less than one and one-half (llh) inches thick after proper compaction. The contractor shaH notify the engineer of the source of his asphaltic material prior to the start of the project. Proper compactipn shaIl be attained as directed by the engi- neer through utilization of specified rollers and/or other approved roIlers. (Ord. No. 1984-71, § 2, 6-13-84; Ord. No. 1987-144, Pt. 10, 11-9-87) Sees. 5-129-5-135. Reserved. Supp. No. 22 250.23