1980-06-30 Special Called Meeting

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Materials. Aggregates shall be composed of clean, tough and durable particles of gravel, crushed gravel, crushed stone, crushed slag or natural limestone rock asphalt. These mater- ials shall not contain more than 5 percent by weight of soft particles, and other deleterious material as determined by Test Method Tex-217-F, Part 1. The natural limestone rock asphalt aggregate furnished shall have an average bitumen content from 4 to 8 percent by weight of naturally. impregnated asphalt, as determined by Test Method Tex-215-F, and shall contain not more than 2 percent by weight of any one of or combination of ircn pyrites or other object- iona3le matter listed above. The percent of wear, as determined by Test Method Tex-410-A, for each of the materials shall not exceed 35 percent. The percent of wear on natural limestone rock asphalt aggregate as determined by Test Method TEx-410-A shall be made on that portion of the material retained on the No. 4 sieve, having a naturally impregnated asphalt content of less than 1 percent. Crushed gravel shall have ,a minimum of 85 per cent of the part, icles retained on the No. 4 sieve with at least one crushed face, as determined by Test rlethod Tex-413-A.. The precoat material shall meet the requirements for "Precoat Materials" as specified in the Item, "Asphalts, Oils and Emulsions". • The flux oil shall meet the requirements for "Flux Oil" ified in the Item, "Asphalts, Oils and Emulsions", as spec- Types. The various types of precoated a-gregates are identified as follows: Type PA. Type PA shall be precoated aggregate consisting of gravel, crushed slag, crushed stone or natural limestone rock asphalt. - - Type PB. Type PB shall be precoated aggregate consisting of crushed gravel, crushed slag, crushed stone or natural limestone rocl: asphalt. Type PC. Type PC shall be precoated aggregate consisting of gravel, crushed slag or crughed stone. Type PD. Type PD shall be precoated aggregate consisting of gravel, crushed slag or crushed stone. Type PE. Type PE shall be precoated aggregate consisting of natural limestone rock asphalt. Grades. When tested by Test Method Tex-200-F, Part i, the gradation • requirements for the several grades of aggregate shall be as follows: (15)