Aggregate shall be composed of a clean and durable crushed rock or crushed gravel conforming to the following requirements: If the aggregate material is to be crushed stone , it shall be manufactured from sound, hard, durable rock of accepted quality and crushed to specification size. All strata, streaks and pockets of clay, dirt, sandstone, soft rock or other unsuitable material accompanying the sound rock shall be discarded and not allowed to enter the crusher. The cover material shall conform to Section 404-2.02 of ADOT Standard Specifications for the following gradation, and shall be an aggregate mix of mechanically crushed rock and shall be free from lumps or balls of clay, contain no calcareous or clay coatings, caliche, synthetic materials, decomposed granite, volcanic cinders, organic matter or foreign substances. If a clean cover material cannot be achieved using conventional crushing and screening methods, then the cover material will have to be washed in water. The crushed aggregate shall not contain more than 8% by weight of elongated or flat pieces and shall be free from wood, roots, vegetable, organic or other extraneous matter. The crushed coarse aggregate shall have a percentage of wear not more than 9 at 100 revolutions and 40 at 500 revolutions, as determined by ASTM C 131. The aggregate shall show no evidence of disintegration nor show a total loss greater than 12% when subjected to five cycles of the sodium sulphate accelerated soundness test specified in ASTM C 88.
