Specifications include, but are not limited to: All ready-mixed concrete shall be produced from plants that are certified by the Louisiana Department of Transportation and Development. Unless otherwise approved, Type I cement conforming to ASTM C-150 shall be used in the mix. All materials shall conform to sections 201 and 601 of the City of Shreveport Standard Specifications for Streets and Storm Drainage (latest edition). The types of concrete to be furnished are as follows: 1. Concrete for Minor Structures – Structural Class A, grade A coarse aggregate; minimum 6 bags of cement of 94 lbs. each to one cu. yd. of concrete. 2. All Other Concrete – Pavement Type B; grade B coarse aggregate; minimum 5.8 bags of cement of 94 lbs. each to one cu. yd. of concrete.