703.2 703.2( a)
703.2COARSE AGGREGATE —
free from clay, silt, vegetation, and other deleterious substances such as reactive chert, gypsum, iron sulfide, amorphous silica, and hydrated iron oxide. Substances present in amounts large enough to cause inconsistent performance in asphalt concrete or plastic or hardened Portland cement concrete are considered deleterious. The LTS will evaluate the quality of coarse aggregates by conducting petrographic analysis according to PTM No. 518 and other tests necessary to demonstrate required construction of acceptable durability can be achieved. Furnish coarse aggregate crushed and prepared from one of the materials described below with physical properties conforming to Tables B, C, and D. Obtain coarse aggregate from a source listed in Bulletin 14 or approved by the LTS before use.
For use in all asphalt wearing courses, unless otherwise specified, a minimum of 85% crushed particles with at least two faces resulting from fracture is required. For use as No. Open Graded Subbase ( OGS ), a minimum of 75% crushed particles with at least three faces resulting from fracture is required. For all Type A use, the maximum allowable absorption determined according to AASHTO T 85 is 3.0%; however, this restriction does not apply to dredged river gravel used in Portland cement concrete. For all Type B use, the maximum allowable absorption determined according to AASHTO T 85 is 3.5%.
air-cooled blast furnace slag. If blast furnace slag was manufactured after January 1, 2007, traceability of material must be established . If trac eability cannot be established, perform chemical testing according to DEP General Permit WMGR144 and s ubmit the test results to the LTS. Blast furnace slag is excluded from the abrasion requirements. The density (unit weight) of blast furnace slag cannot be less than 70 pounds per cubic foot. If there is more than 5% contamination of steel slag in a stockpile, the stockpile is considered steel slag. Limit the st ockpile size to a maximum of 30, 000 tons .
reasonably uniform in density and quality. If steel slag was manufactured after January 1, 2007, traceability of material must be established . If traceability cannot be established, perform chemical testing according to DEP General Permit WMGR144 and submit the test results to the LTS. After crushing, grading, and forming a stockpile, t