1980-06-30 Special Called Meeting

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• Item 301 AGGREGATE FOR SURFACE TREATMENTS • (Class A) :] Description. This item establishes the rec{uirements far agg- regate to be used in ttie construction of surface treatments. 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 S percent by weight of soft particles and other deleterious materials 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 dett~rmined by Test Method Tex-215-F, and shall contain not more than 2 percent by weight of any one of or combination of iron pyrites, or other object- ionable matter, as determined by Test rlethod Tex-217-F, Part 1. No aggregate shall contain a total of more than S percent by weight of impurities or objectionable matter listed above. The percent of wear, as determined by Test Method Tex-410-A, for each of the materials shall not exceed 3~ 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. Crusti4d gravel shall have a minir~~um of 85 percent of the part- icles retained on the No. 4 sieve with at lust one crushed face, as determined by Test Method Tex-413-A. T~.~pes. The various types of aggregates are identified as follows: T~.~pe ~'1. Type A aggregate shall consist of gravel, crushed slag, crushed stone or natural limestone rock asphalt. Tvpe B. Type B aggregate shall consist of. crushed F;ravel, crushed slag, crushed stone or natural limestone rock asphalt. TyE:e C. Type C aggregate shill consist of gravel, crushed slap or crushed stone. Tvpe D. Type D aggregate shall consist of crushed gravel, crushed slag or crushed stone. Type E. Type E aggregate shall consist of natural limestone rock .-sphalt. (19)