Bitumen Penetration Specification:
penetration grading system developed in 1900`s. Bitumen Penetration Specification quantifies following asphalt concrete characteristics:
Bitumen penetration also classified using penetration property. The grading’s basic assumption is that less viscous the asphalt, deeper the needle will penetrate. Furthermore, Bitumen which is produced during the process of oxidation of vacuum bottom (the Bitumen production feed-stock that derives from distillation tower residue in vacuum oil refineries). Also at bitumen production unit in a manner that its penetration point (kind of test to indicate the hardness of bitumen) in specified group is classified in different grade of Bitumen.
It mostly used in road surfacing and industrial uses. In addition, processing yields other grades of bitumen products and uses.
Bitumen Penetration Specification characteristics:
Bitumen is available in a variety of grades. It`s graded according to standard testing methods. These tests also give rise to two commonly used terms which describe the method of measurement, rather than a “type” of bitumen.
Penetration Grade Bitumen are specified by the penetration and softening point test. Designation is by penetration range only. The Penetration Grade Bitumen have a thermoplastic property which causes the material to soften at high temperatures and to harden at lower temperatures. This unique temperature/viscosity relationship is important when determining the performance parameters such as the adhesion, rheology, durability and application temperatures of bitumen.
The major Penetration Grade Bitumen is Bitumen 60/70 that is generaly usable for all the markets.
Penetration grading characteristics:
Penetration depth of a 100 g needle 25° C (77° F)
Flash point temperature
Ductility at 25°C (77°F)
Solubility in trichloroethylene
Thin film oven test(accounts for the effects of short-term aging that occurs during mixing with hot aggregate)
Ductility at 25° C (77° F)
Bitumen Penetration Grades Specification PDF: