1980-06-30 Special Called Meeting

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• THE DESCRIBED MATERIAL SHALL BE PRICED PER TON F, 0, B. LA PORTE OR PICKED UP AT POIr1T OF ORIGIN, • ITEM 330 COLD MIX LIMESTONE ROCK ASPIiALT PAVEMENT 330.1 Description. This item shall consist of a surface course, a leveling-up course, or a combination of these courses as shown on plans, composed of a compacted layer of natural limestone rock asphalt, cold mixed with a prescribed flux and shall be constructed on the completed and approved base course, existing pavement or floor slab, all in accordance with these specifications and in conformity with the lines; grades, quantities and typical cross section shown on plans, The mixture when designed and tested in accordance with these specifications shall have a laboratory stability of not less than 30 percent unless otherwise shown on the plans. 330.2 Materials. Rock Asphalt. This material shall be composed of natural lime- stone rock asphalt. This material shall contain not more than 1 percent by weight of organic matter (Other than native bitumen), clays, loam or pebbles coated therewith and shall contain not more than 5 percent by weight of any one of or combination of slate, shale, shcist, soft particles or other undesirable materials • when tested in accordance with Test Method Tex-217-F, The rock asphalt mixture shall contain natural limestone rock asphalt aggregate with an average bitumen content of 5 to 9 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 iron pyrites, or other objectionable matter, as determined by Test Method Te:c-217-F. No aggregate shall contain a total of more than 5 percent by weight of impurities or objectionable matter listed above. The portion of the material passing the No. 10 sieve shall have by weight not more than 8.5 percent not less than 5 percent of naturally impregnated asphalt, Except for Type D Paving Mixture, the portion of the material retained on the No. 4 sieve shall contain by weight from 20 percent to 35 percent of material with a naturally im- pregnated asphalt content of less than 1 percent, The portion of the riaterial retained on the rdo. 4 sieve for Type D Paving Mixture shall contain by weight from 15 percent to 35 percent of the material with naturally impregnated asphalt content of less than 1 percent. This percentage shall be adjusted within the grading limits to obtain an acceptable mixture. ($)