Реферат

This specification covers three sets of physical requirement limits for asphalt cements graded by viscosity at a specified temperature for use in pavement construction. The purchaser shall indicate the applicable table of limits. The cements shall be prepared from crude petroleum by suitable methods, and if needed, volume corrections should be made as well. The properties for which the materials shall be tested on and should conform to are water content, viscosity, penetration, Cleveland open cup flash point, solubility in trichloroethylene, ductility, and behavior during thin-film oven and rolling thin-film oven tests on residue.

Область применения

1.1 This specification covers asphalt cements graded by viscosity at 140°F (60°C) for use in pavement construction. Three sets of limits are offered in this specification. The purchaser shall specify the applicable table of limits. In the event the purchaser does not specify limits, Table 1 shall apply. For asphalt cements graded by penetration at 77°F (25°C) (see Specification D 946). If needed, volume corrections for asphalt cements should be made according to Practice D 4311.

TABLE 1 Requirements for Asphalt Cement, Viscosity Graded at 140°F (60°C)

Note—Grading based on original asphalt.

TestViscosity Grade AC-2.5AC-5 AC-10AC-20AC-30AC-40 Viscosity, 140°F (60°C), P250 ± 50500 ± 1001000± 2002000 ± 4003000 ± 6004000 ± 800 Viscosity, 275°F (135°C), min, cSt80110150210250300 Penetration, 77°F (25°C), 100 g, 5 s, min20012070403020 Flash point, Cleveland open cup, min,° F (°C)325 (163)350 (177) 425 (219)450 (232)450 (232)450 (232) Solubility in trichloroethylene, min, %99.0 99.099.099.099.099.0 Tests on residue from thin-film oven test: Viscosity, 140°F (60°C), max, P12502500500010 00015 000 20 000 Ductility, 77°F (25°C), 5 cm/min, min, cm100^A100 502015 10

^A If ductility is less than 100, material will be accepted if ductility at 60°F (15.5°C) is 100 minimum at a pull rate of 5 cm/min.